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SkMatrix Reference
===
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< a name = 'SkMatrix' > < / a >
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---
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< pre style = "padding: 1em 1em 1em 1em;width: 62.5em; background-color: #f0f0f0 " >
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class < a href = 'SkMatrix_Reference#SkMatrix' > SkMatrix< / a > {
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static < a href = 'SkMatrix_Reference#SkMatrix' > SkMatrix< / a > < a href = '#SkMatrix_MakeScale' > MakeScale< / a > (< a href = 'undocumented#SkScalar' > SkScalar< / a > sx, < a href = 'undocumented#SkScalar' > SkScalar< / a > sy);
static < a href = 'SkMatrix_Reference#SkMatrix' > SkMatrix< / a > < a href = '#SkMatrix_MakeScale' > MakeScale< / a > (< a href = 'undocumented#SkScalar' > SkScalar< / a > scale);
static < a href = 'SkMatrix_Reference#SkMatrix' > SkMatrix< / a > < a href = '#SkMatrix_MakeTrans' > MakeTrans< / a > (< a href = 'undocumented#SkScalar' > SkScalar< / a > dx, < a href = 'undocumented#SkScalar' > SkScalar< / a > dy);
static < a href = 'SkMatrix_Reference#SkMatrix' > SkMatrix< / a > < a href = '#SkMatrix_MakeAll' > MakeAll< / a > (< a href = 'undocumented#SkScalar' > SkScalar< / a > scaleX, < a href = 'undocumented#SkScalar' > SkScalar< / a > skewX, < a href = 'undocumented#SkScalar' > SkScalar< / a > transX,
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< a href = 'undocumented#SkScalar' > SkScalar< / a > skewY, < a href = 'undocumented#SkScalar' > SkScalar< / a > scaleY, < a href = 'undocumented#SkScalar' > SkScalar< / a > transY,
< a href = 'undocumented#SkScalar' > SkScalar< / a > pers0, < a href = 'undocumented#SkScalar' > SkScalar< / a > pers1, < a href = 'undocumented#SkScalar' > SkScalar< / a > pers2);
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enum < a href = '#SkMatrix_TypeMask' > TypeMask< / a > {
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< a href = '#SkMatrix_kIdentity_Mask' > kIdentity_Mask< / a > = 0,
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< a href = '#SkMatrix_kTranslate_Mask' > kTranslate_Mask< / a > = 0x01,
< a href = '#SkMatrix_kScale_Mask' > kScale_Mask< / a > = 0x02,
< a href = '#SkMatrix_kAffine_Mask' > kAffine_Mask< / a > = 0x04,
< a href = '#SkMatrix_kPerspective_Mask' > kPerspective_Mask< / a > = 0x08,
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};
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< a href = '#SkMatrix_TypeMask' > TypeMask< / a > < a href = '#SkMatrix_getType' > getType< / a > () const;
bool < a href = '#SkMatrix_isIdentity' > isIdentity< / a > () const;
bool < a href = '#SkMatrix_isScaleTranslate' > isScaleTranslate< / a > () const;
bool < a href = '#SkMatrix_isTranslate' > isTranslate< / a > () const;
bool < a href = '#SkMatrix_rectStaysRect' > rectStaysRect< / a > () const;
bool < a href = '#SkMatrix_preservesAxisAlignment' > preservesAxisAlignment< / a > () const;
bool < a href = '#SkMatrix_hasPerspective' > hasPerspective< / a > () const;
bool < a href = '#SkMatrix_isSimilarity' > isSimilarity< / a > (< a href = 'undocumented#SkScalar' > SkScalar< / a > tol = < a href = 'undocumented#SK_ScalarNearlyZero' > SK_ScalarNearlyZero< / a > ) const;
bool < a href = '#SkMatrix_preservesRightAngles' > preservesRightAngles< / a > (< a href = 'undocumented#SkScalar' > SkScalar< / a > tol = < a href = 'undocumented#SK_ScalarNearlyZero' > SK_ScalarNearlyZero< / a > ) const;
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static constexpr int < a href = '#SkMatrix_kMScaleX' > kMScaleX< / a > = 0 static constexpr int < a href = '#SkMatrix_kMSkewX' > kMSkewX< / a > = 1 static constexpr int < a href = '#SkMatrix_kMTransX' > kMTransX< / a > = 2 static constexpr int < a href = '#SkMatrix_kMSkewY' > kMSkewY< / a > = 3 static constexpr int < a href = '#SkMatrix_kMScaleY' > kMScaleY< / a > = 4 static constexpr int < a href = '#SkMatrix_kMTransY' > kMTransY< / a > = 5 static constexpr int < a href = '#SkMatrix_kMPersp0' > kMPersp0< / a > = 6 static constexpr int < a href = '#SkMatrix_kMPersp1' > kMPersp1< / a > = 7 static constexpr int < a href = '#SkMatrix_kMPersp2' > kMPersp2< / a > = 8 static constexpr int < a href = '#SkMatrix_kAScaleX' > kAScaleX< / a > = 0 static constexpr int < a href = '#SkMatrix_kASkewY' > kASkewY< / a > = 1 static constexpr int < a href = '#SkMatrix_kASkewX' > kASkewX< / a > = 2 static constexpr int < a href = '#SkMatrix_kAScaleY' > kAScaleY< / a > = 3 static constexpr int < a href = '#SkMatrix_kATransX' > kATransX< / a > = 4 static constexpr int < a href = '#SkMatrix_kATransY' > kATransY< / a > = 5
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< a href = 'undocumented#SkScalar' > SkScalar< / a > < a href = '#SkMatrix_array_operator' > operator[]< / a > (int index) const;
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< a href = 'undocumented#SkScalar' > SkScalar< / a > < a href = '#SkMatrix_get' > get< / a > (int index) const;
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< a href = 'undocumented#SkScalar' > SkScalar< / a > < a href = '#SkMatrix_getScaleX' > getScaleX< / a > () const;
< a href = 'undocumented#SkScalar' > SkScalar< / a > < a href = '#SkMatrix_getScaleY' > getScaleY< / a > () const;
< a href = 'undocumented#SkScalar' > SkScalar< / a > < a href = '#SkMatrix_getSkewY' > getSkewY< / a > () const;
< a href = 'undocumented#SkScalar' > SkScalar< / a > < a href = '#SkMatrix_getSkewX' > getSkewX< / a > () const;
< a href = 'undocumented#SkScalar' > SkScalar< / a > < a href = '#SkMatrix_getTranslateX' > getTranslateX< / a > () const;
< a href = 'undocumented#SkScalar' > SkScalar< / a > < a href = '#SkMatrix_getTranslateY' > getTranslateY< / a > () const;
< a href = 'undocumented#SkScalar' > SkScalar< / a > < a href = '#SkMatrix_getPerspX' > getPerspX< / a > () const;
< a href = 'undocumented#SkScalar' > SkScalar< / a > < a href = '#SkMatrix_getPerspY' > getPerspY< / a > () const;
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< a href = 'undocumented#SkScalar' > SkScalar< / a > & < a href = '#SkMatrix_array1_operator' > operator[]< / a > (int index);
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void < a href = '#SkMatrix_set' > set< / a > (int index, < a href = 'undocumented#SkScalar' > SkScalar< / a > value);
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void < a href = '#SkMatrix_setScaleX' > setScaleX< / a > (< a href = 'undocumented#SkScalar' > SkScalar< / a > v);
void < a href = '#SkMatrix_setScaleY' > setScaleY< / a > (< a href = 'undocumented#SkScalar' > SkScalar< / a > v);
void < a href = '#SkMatrix_setSkewY' > setSkewY< / a > (< a href = 'undocumented#SkScalar' > SkScalar< / a > v);
void < a href = '#SkMatrix_setSkewX' > setSkewX< / a > (< a href = 'undocumented#SkScalar' > SkScalar< / a > v);
void < a href = '#SkMatrix_setTranslateX' > setTranslateX< / a > (< a href = 'undocumented#SkScalar' > SkScalar< / a > v);
void < a href = '#SkMatrix_setTranslateY' > setTranslateY< / a > (< a href = 'undocumented#SkScalar' > SkScalar< / a > v);
void < a href = '#SkMatrix_setPerspX' > setPerspX< / a > (< a href = 'undocumented#SkScalar' > SkScalar< / a > v);
void < a href = '#SkMatrix_setPerspY' > setPerspY< / a > (< a href = 'undocumented#SkScalar' > SkScalar< / a > v);
void < a href = '#SkMatrix_setAll' > setAll< / a > (< a href = 'undocumented#SkScalar' > SkScalar< / a > scaleX, < a href = 'undocumented#SkScalar' > SkScalar< / a > skewX, < a href = 'undocumented#SkScalar' > SkScalar< / a > transX,
< a href = 'undocumented#SkScalar' > SkScalar< / a > skewY, < a href = 'undocumented#SkScalar' > SkScalar< / a > scaleY, < a href = 'undocumented#SkScalar' > SkScalar< / a > transY,
< a href = 'undocumented#SkScalar' > SkScalar< / a > persp0, < a href = 'undocumented#SkScalar' > SkScalar< / a > persp1, < a href = 'undocumented#SkScalar' > SkScalar< / a > persp2);
void < a href = '#SkMatrix_get9' > get9< / a > (< a href = 'undocumented#SkScalar' > SkScalar< / a > buffer[9]) const;
void < a href = '#SkMatrix_set9' > set9< / a > (const < a href = 'undocumented#SkScalar' > SkScalar< / a > buffer[9]);
void < a href = '#SkMatrix_reset' > reset()< / a > ;
void < a href = '#SkMatrix_setIdentity' > setIdentity< / a > ();
void < a href = '#SkMatrix_setTranslate' > setTranslate< / a > (< a href = 'undocumented#SkScalar' > SkScalar< / a > dx, < a href = 'undocumented#SkScalar' > SkScalar< / a > dy);
void < a href = '#SkMatrix_setTranslate' > setTranslate< / a > (const < a href = 'SkPoint_Reference#SkVector' > SkVector< / a > & v);
void < a href = '#SkMatrix_setScale' > setScale< / a > (< a href = 'undocumented#SkScalar' > SkScalar< / a > sx, < a href = 'undocumented#SkScalar' > SkScalar< / a > sy, < a href = 'undocumented#SkScalar' > SkScalar< / a > px, < a href = 'undocumented#SkScalar' > SkScalar< / a > py);
void < a href = '#SkMatrix_setScale' > setScale< / a > (< a href = 'undocumented#SkScalar' > SkScalar< / a > sx, < a href = 'undocumented#SkScalar' > SkScalar< / a > sy);
void < a href = '#SkMatrix_setRotate' > setRotate< / a > (< a href = 'undocumented#SkScalar' > SkScalar< / a > degrees, < a href = 'undocumented#SkScalar' > SkScalar< / a > px, < a href = 'undocumented#SkScalar' > SkScalar< / a > py);
void < a href = '#SkMatrix_setRotate' > setRotate< / a > (< a href = 'undocumented#SkScalar' > SkScalar< / a > degrees);
void < a href = '#SkMatrix_setSinCos' > setSinCos< / a > (< a href = 'undocumented#SkScalar' > SkScalar< / a > sinValue, < a href = 'undocumented#SkScalar' > SkScalar< / a > cosValue,
< a href = 'undocumented#SkScalar' > SkScalar< / a > px, < a href = 'undocumented#SkScalar' > SkScalar< / a > py);
void < a href = '#SkMatrix_setSinCos' > setSinCos< / a > (< a href = 'undocumented#SkScalar' > SkScalar< / a > sinValue, < a href = 'undocumented#SkScalar' > SkScalar< / a > cosValue);
< a href = 'SkMatrix_Reference#SkMatrix' > SkMatrix< / a > & < a href = '#SkMatrix_setRSXform' > setRSXform< / a > (const < a href = 'undocumented#SkRSXform' > SkRSXform< / a > & rsxForm);
void < a href = '#SkMatrix_setSkew' > setSkew< / a > (< a href = 'undocumented#SkScalar' > SkScalar< / a > kx, < a href = 'undocumented#SkScalar' > SkScalar< / a > ky, < a href = 'undocumented#SkScalar' > SkScalar< / a > px, < a href = 'undocumented#SkScalar' > SkScalar< / a > py);
void < a href = '#SkMatrix_setSkew' > setSkew< / a > (< a href = 'undocumented#SkScalar' > SkScalar< / a > kx, < a href = 'undocumented#SkScalar' > SkScalar< / a > ky);
void < a href = '#SkMatrix_setConcat' > setConcat< / a > (const < a href = 'SkMatrix_Reference#SkMatrix' > SkMatrix< / a > & a, const < a href = 'SkMatrix_Reference#SkMatrix' > SkMatrix< / a > & b);
void < a href = '#SkMatrix_preTranslate' > preTranslate< / a > (< a href = 'undocumented#SkScalar' > SkScalar< / a > dx, < a href = 'undocumented#SkScalar' > SkScalar< / a > dy);
void < a href = '#SkMatrix_preScale' > preScale< / a > (< a href = 'undocumented#SkScalar' > SkScalar< / a > sx, < a href = 'undocumented#SkScalar' > SkScalar< / a > sy, < a href = 'undocumented#SkScalar' > SkScalar< / a > px, < a href = 'undocumented#SkScalar' > SkScalar< / a > py);
void < a href = '#SkMatrix_preScale' > preScale< / a > (< a href = 'undocumented#SkScalar' > SkScalar< / a > sx, < a href = 'undocumented#SkScalar' > SkScalar< / a > sy);
void < a href = '#SkMatrix_preRotate' > preRotate< / a > (< a href = 'undocumented#SkScalar' > SkScalar< / a > degrees, < a href = 'undocumented#SkScalar' > SkScalar< / a > px, < a href = 'undocumented#SkScalar' > SkScalar< / a > py);
void < a href = '#SkMatrix_preRotate' > preRotate< / a > (< a href = 'undocumented#SkScalar' > SkScalar< / a > degrees);
void < a href = '#SkMatrix_preSkew' > preSkew< / a > (< a href = 'undocumented#SkScalar' > SkScalar< / a > kx, < a href = 'undocumented#SkScalar' > SkScalar< / a > ky, < a href = 'undocumented#SkScalar' > SkScalar< / a > px, < a href = 'undocumented#SkScalar' > SkScalar< / a > py);
void < a href = '#SkMatrix_preSkew' > preSkew< / a > (< a href = 'undocumented#SkScalar' > SkScalar< / a > kx, < a href = 'undocumented#SkScalar' > SkScalar< / a > ky);
void < a href = '#SkMatrix_preConcat' > preConcat< / a > (const < a href = 'SkMatrix_Reference#SkMatrix' > SkMatrix< / a > & other);
void < a href = '#SkMatrix_postTranslate' > postTranslate< / a > (< a href = 'undocumented#SkScalar' > SkScalar< / a > dx, < a href = 'undocumented#SkScalar' > SkScalar< / a > dy);
void < a href = '#SkMatrix_postScale' > postScale< / a > (< a href = 'undocumented#SkScalar' > SkScalar< / a > sx, < a href = 'undocumented#SkScalar' > SkScalar< / a > sy, < a href = 'undocumented#SkScalar' > SkScalar< / a > px, < a href = 'undocumented#SkScalar' > SkScalar< / a > py);
void < a href = '#SkMatrix_postScale' > postScale< / a > (< a href = 'undocumented#SkScalar' > SkScalar< / a > sx, < a href = 'undocumented#SkScalar' > SkScalar< / a > sy);
bool < a href = '#SkMatrix_postIDiv' > postIDiv< / a > (int divx, int divy);
void < a href = '#SkMatrix_postRotate' > postRotate< / a > (< a href = 'undocumented#SkScalar' > SkScalar< / a > degrees, < a href = 'undocumented#SkScalar' > SkScalar< / a > px, < a href = 'undocumented#SkScalar' > SkScalar< / a > py);
void < a href = '#SkMatrix_postRotate' > postRotate< / a > (< a href = 'undocumented#SkScalar' > SkScalar< / a > degrees);
void < a href = '#SkMatrix_postSkew' > postSkew< / a > (< a href = 'undocumented#SkScalar' > SkScalar< / a > kx, < a href = 'undocumented#SkScalar' > SkScalar< / a > ky, < a href = 'undocumented#SkScalar' > SkScalar< / a > px, < a href = 'undocumented#SkScalar' > SkScalar< / a > py);
void < a href = '#SkMatrix_postSkew' > postSkew< / a > (< a href = 'undocumented#SkScalar' > SkScalar< / a > kx, < a href = 'undocumented#SkScalar' > SkScalar< / a > ky);
void < a href = '#SkMatrix_postConcat' > postConcat< / a > (const < a href = 'SkMatrix_Reference#SkMatrix' > SkMatrix< / a > & other);
enum < a href = '#SkMatrix_ScaleToFit' > ScaleToFit< / a > {
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< a href = '#SkMatrix_kFill_ScaleToFit' > kFill_ScaleToFit< / a > ,
< a href = '#SkMatrix_kStart_ScaleToFit' > kStart_ScaleToFit< / a > ,
< a href = '#SkMatrix_kCenter_ScaleToFit' > kCenter_ScaleToFit< / a > ,
< a href = '#SkMatrix_kEnd_ScaleToFit' > kEnd_ScaleToFit< / a > ,
};
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bool < a href = '#SkMatrix_setRectToRect' > setRectToRect< / a > (const < a href = 'SkRect_Reference#SkRect' > SkRect< / a > & src, const < a href = 'SkRect_Reference#SkRect' > SkRect< / a > & dst, < a href = '#SkMatrix_ScaleToFit' > ScaleToFit< / a > stf);
static < a href = 'SkMatrix_Reference#SkMatrix' > SkMatrix< / a > < a href = '#SkMatrix_MakeRectToRect' > MakeRectToRect< / a > (const < a href = 'SkRect_Reference#SkRect' > SkRect< / a > & src, const < a href = 'SkRect_Reference#SkRect' > SkRect< / a > & dst, < a href = '#SkMatrix_ScaleToFit' > ScaleToFit< / a > stf);
bool < a href = '#SkMatrix_setPolyToPoly' > setPolyToPoly< / a > (const < a href = 'SkPoint_Reference#SkPoint' > SkPoint< / a > src[], const < a href = 'SkPoint_Reference#SkPoint' > SkPoint< / a > dst[], int count);
bool < a href = '#SkMatrix_invert' > invert< / a > (< a href = 'SkMatrix_Reference#SkMatrix' > SkMatrix< / a > * inverse) const;
static void < a href = '#SkMatrix_SetAffineIdentity' > SetAffineIdentity< / a > (< a href = 'undocumented#SkScalar' > SkScalar< / a > affine[6]);
bool < a href = '#SkMatrix_asAffine' > asAffine< / a > (< a href = 'undocumented#SkScalar' > SkScalar< / a > affine[6]) const;
void < a href = '#SkMatrix_setAffine' > setAffine< / a > (const < a href = 'undocumented#SkScalar' > SkScalar< / a > affine[6]);
void < a href = '#SkMatrix_mapPoints' > mapPoints< / a > (< a href = 'SkPoint_Reference#SkPoint' > SkPoint< / a > dst[], const < a href = 'SkPoint_Reference#SkPoint' > SkPoint< / a > src[], int count) const;
void < a href = '#SkMatrix_mapPoints' > mapPoints< / a > (< a href = 'SkPoint_Reference#SkPoint' > SkPoint< / a > pts[], int count) const;
void < a href = '#SkMatrix_mapHomogeneousPoints' > mapHomogeneousPoints< / a > (< a href = 'undocumented#SkPoint3' > SkPoint3< / a > dst[], const < a href = 'undocumented#SkPoint3' > SkPoint3< / a > src[], int count) const;
void < a href = '#SkMatrix_mapXY' > mapXY< / a > (< a href = 'undocumented#SkScalar' > SkScalar< / a > x, < a href = 'undocumented#SkScalar' > SkScalar< / a > y, < a href = 'SkPoint_Reference#SkPoint' > SkPoint< / a > * result) const;
< a href = 'SkPoint_Reference#SkPoint' > SkPoint< / a > < a href = '#SkMatrix_mapXY' > mapXY< / a > (< a href = 'undocumented#SkScalar' > SkScalar< / a > x, < a href = 'undocumented#SkScalar' > SkScalar< / a > y) const;
void < a href = '#SkMatrix_mapVectors' > mapVectors< / a > (< a href = 'SkPoint_Reference#SkVector' > SkVector< / a > dst[], const < a href = 'SkPoint_Reference#SkVector' > SkVector< / a > src[], int count) const;
void < a href = '#SkMatrix_mapVectors' > mapVectors< / a > (< a href = 'SkPoint_Reference#SkVector' > SkVector< / a > vecs[], int count) const;
void < a href = '#SkMatrix_mapVector' > mapVector< / a > (< a href = 'undocumented#SkScalar' > SkScalar< / a > dx, < a href = 'undocumented#SkScalar' > SkScalar< / a > dy, < a href = 'SkPoint_Reference#SkVector' > SkVector< / a > * result) const;
< a href = 'SkPoint_Reference#SkVector' > SkVector< / a > < a href = '#SkMatrix_mapVector' > mapVector< / a > (< a href = 'undocumented#SkScalar' > SkScalar< / a > dx, < a href = 'undocumented#SkScalar' > SkScalar< / a > dy) const;
bool < a href = '#SkMatrix_mapRect' > mapRect< / a > (< a href = 'SkRect_Reference#SkRect' > SkRect< / a > * dst, const < a href = 'SkRect_Reference#SkRect' > SkRect< / a > & src) const;
bool < a href = '#SkMatrix_mapRect' > mapRect< / a > (< a href = 'SkRect_Reference#SkRect' > SkRect< / a > * < a href = 'SkRect_Reference#Rect' > rect< / a > ) const;
< a href = 'SkRect_Reference#SkRect' > SkRect< / a > < a href = '#SkMatrix_mapRect' > mapRect< / a > (const < a href = 'SkRect_Reference#SkRect' > SkRect< / a > & src) const;
void < a href = '#SkMatrix_mapRectToQuad' > mapRectToQuad< / a > (< a href = 'SkPoint_Reference#SkPoint' > SkPoint< / a > dst[4], const < a href = 'SkRect_Reference#SkRect' > SkRect< / a > & < a href = 'SkRect_Reference#Rect' > rect< / a > ) const;
void < a href = '#SkMatrix_mapRectScaleTranslate' > mapRectScaleTranslate< / a > (< a href = 'SkRect_Reference#SkRect' > SkRect< / a > * dst, const < a href = 'SkRect_Reference#SkRect' > SkRect< / a > & src) const;
< a href = 'undocumented#SkScalar' > SkScalar< / a > < a href = '#SkMatrix_mapRadius' > mapRadius< / a > (< a href = 'undocumented#SkScalar' > SkScalar< / a > radius) const;
bool < a href = '#SkMatrix_isFixedStepInX' > isFixedStepInX< / a > () const;
< a href = 'SkPoint_Reference#SkVector' > SkVector< / a > < a href = '#SkMatrix_fixedStepInX' > fixedStepInX< / a > (< a href = 'undocumented#SkScalar' > SkScalar< / a > y) const;
bool < a href = '#SkMatrix_cheapEqualTo' > cheapEqualTo< / a > (const < a href = 'SkMatrix_Reference#SkMatrix' > SkMatrix< / a > & m) const;
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friend bool < a href = '#SkMatrix_equal_operator' > operator==< / a > (const < a href = 'SkMatrix_Reference#SkMatrix' > SkMatrix< / a > & a, const < a href = 'SkMatrix_Reference#SkMatrix' > SkMatrix< / a > & b);
friend bool < a href = '#SkMatrix_notequal_operator' > operator!=< / a > (const < a href = 'SkMatrix_Reference#SkMatrix' > SkMatrix< / a > & a, const < a href = 'SkMatrix_Reference#SkMatrix' > SkMatrix< / a > & b);
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void < a href = '#SkMatrix_dump' > dump()< / a > const;
< a href = 'undocumented#SkScalar' > SkScalar< / a > < a href = '#SkMatrix_getMinScale' > getMinScale< / a > () const;
< a href = 'undocumented#SkScalar' > SkScalar< / a > < a href = '#SkMatrix_getMaxScale' > getMaxScale< / a > () const;
bool < a href = '#SkMatrix_getMinMaxScales' > getMinMaxScales< / a > (< a href = 'undocumented#SkScalar' > SkScalar< / a > scaleFactors[2]) const;
bool < a href = '#SkMatrix_decomposeScale' > decomposeScale< / a > (< a href = 'undocumented#SkSize' > SkSize< / a > * scale, < a href = 'SkMatrix_Reference#SkMatrix' > SkMatrix< / a > * remaining = nullptr) const;
static const < a href = 'SkMatrix_Reference#SkMatrix' > SkMatrix< / a > & < a href = '#SkMatrix_I' > I< / a > ();
static const < a href = 'SkMatrix_Reference#SkMatrix' > SkMatrix< / a > & < a href = '#SkMatrix_InvalidMatrix' > InvalidMatrix< / a > ();
static < a href = 'SkMatrix_Reference#SkMatrix' > SkMatrix< / a > < a href = '#SkMatrix_Concat' > Concat< / a > (const < a href = 'SkMatrix_Reference#SkMatrix' > SkMatrix< / a > & a, const < a href = 'SkMatrix_Reference#SkMatrix' > SkMatrix< / a > & b);
void < a href = '#SkMatrix_dirtyMatrixTypeCache' > dirtyMatrixTypeCache< / a > ();
void < a href = '#SkMatrix_setScaleTranslate' > setScaleTranslate< / a > (< a href = 'undocumented#SkScalar' > SkScalar< / a > sx, < a href = 'undocumented#SkScalar' > SkScalar< / a > sy, < a href = 'undocumented#SkScalar' > SkScalar< / a > tx, < a href = 'undocumented#SkScalar' > SkScalar< / a > ty);
bool < a href = '#SkMatrix_isFinite' > isFinite< / a > () const;
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};
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< / pre >
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< a href = 'SkMatrix_Reference#Matrix' > Matrix< / a > holds a 3 by 3 < a href = 'SkMatrix_Reference#Matrix' > matrix< / a > for transforming coordinates. This allows mapping
< a href = 'SkPoint_Reference#Point' > Points< / a > and < a href = 'SkPoint_Reference#Vector' > Vectors< / a > with translation, scaling, skewing, rotation, and
perspective.
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< a href = 'SkMatrix_Reference#Matrix' > Matrix< / a > elements are in row major order. < a href = 'SkMatrix_Reference#Matrix' > Matrix< / a > does not have a constructor,
so it must be explicitly initialized. < a href = '#SkMatrix_setIdentity' > setIdentity< / a > initializes < a href = 'SkMatrix_Reference#Matrix' > Matrix< / a >
so it has no effect. < a href = '#SkMatrix_setTranslate' > setTranslate< / a > , < a href = '#SkMatrix_setScale' > setScale< / a > , < a href = '#SkMatrix_setSkew' > setSkew< / a > , < a href = '#SkMatrix_setRotate' > setRotate< / a > , < a href = '#SkMatrix_set9' > set9< / a > and < a href = '#SkMatrix_setAll' > setAll< / a >
initializes all < a href = 'SkMatrix_Reference#Matrix' > Matrix< / a > elements with the corresponding mapping.
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< a href = 'SkMatrix_Reference#Matrix' > Matrix< / a > includes a hidden variable that classifies the type of < a href = 'SkMatrix_Reference#Matrix' > matrix< / a > to
improve performance. < a href = 'SkMatrix_Reference#Matrix' > Matrix< / a > is not thread safe unless < a href = '#SkMatrix_getType' > getType< / a > is called first.
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< a name = 'SkMatrix_MakeScale' > < / a >
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---
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< pre style = "padding: 1em 1em 1em 1em; width: 62.5em;background-color: #f0f0f0 " >
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static < a href = 'SkMatrix_Reference#SkMatrix' > SkMatrix< / a > < a href = '#SkMatrix_MakeScale' > MakeScale< / a > (< a href = 'undocumented#SkScalar' > SkScalar< / a > sx, < a href = 'undocumented#SkScalar' > SkScalar< / a > sy)
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< / pre >
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Sets < a href = 'SkMatrix_Reference#SkMatrix' > SkMatrix< / a > to scale by (< a href = '#SkMatrix_MakeScale_sx' > sx< / a > , < a href = '#SkMatrix_MakeScale_sy' > sy< / a > ). Returned < a href = 'SkMatrix_Reference#Matrix' > matrix< / a > is:
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| < a href = '#SkMatrix_MakeScale_sx' > sx< / a > 0 0 |
| 0 < a href = '#SkMatrix_MakeScale_sy' > sy< / a > 0 |
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| 0 0 1 |
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### Parameters
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< table > < tr > < td > < a name = 'SkMatrix_MakeScale_sx' > < code > < strong > sx< / strong > < / code > < / a > < / td >
< td > horizontal scale factor< / td >
< / tr >
< tr > < td > < a name = 'SkMatrix_MakeScale_sy' > < code > < strong > sy< / strong > < / code > < / a > < / td >
< td > vertical scale factor< / td >
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< / tr >
< / table >
### Return Value
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< a href = 'SkMatrix_Reference#SkMatrix' > SkMatrix< / a > with scale
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### Example
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< div > < fiddle-embed name = "@Matrix_MakeScale" > < / fiddle-embed > < / div >
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### See Also
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< a href = '#SkMatrix_setScale' > setScale< / a > < a href = '#SkMatrix_postScale' > postScale< / a > < a href = '#SkMatrix_preScale' > preScale< / a >
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< a name = 'SkMatrix_MakeScale_2' > < / a >
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---
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< pre style = "padding: 1em 1em 1em 1em; width: 62.5em;background-color: #f0f0f0 " >
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static < a href = 'SkMatrix_Reference#SkMatrix' > SkMatrix< / a > < a href = '#SkMatrix_MakeScale' > MakeScale< / a > (< a href = 'undocumented#SkScalar' > SkScalar< / a > scale)
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< / pre >
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Sets < a href = 'SkMatrix_Reference#SkMatrix' > SkMatrix< / a > to < a href = '#SkMatrix_MakeScale_2_scale' > scale< / a > by (< a href = '#SkMatrix_MakeScale_2_scale' > scale< / a > , < a href = '#SkMatrix_MakeScale_2_scale' > scale< / a > ). Returned < a href = 'SkMatrix_Reference#Matrix' > matrix< / a > is:
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| < a href = '#SkMatrix_MakeScale_2_scale' > scale< / a > 0 0 |
| 0 < a href = '#SkMatrix_MakeScale_2_scale' > scale< / a > 0 |
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| 0 0 1 |
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### Parameters
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< table > < tr > < td > < a name = 'SkMatrix_MakeScale_2_scale' > < code > < strong > scale< / strong > < / code > < / a > < / td >
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< td > horizontal and vertical < a href = '#SkMatrix_MakeScale_2_scale' > scale< / a > factor< / td >
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< / tr >
< / table >
### Return Value
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< a href = 'SkMatrix_Reference#SkMatrix' > SkMatrix< / a > with < a href = '#SkMatrix_MakeScale_2_scale' > scale< / a >
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### Example
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< div > < fiddle-embed name = "@Matrix_MakeScale_2" > < / fiddle-embed > < / div >
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### See Also
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< a href = '#SkMatrix_setScale' > setScale< / a > < a href = '#SkMatrix_postScale' > postScale< / a > < a href = '#SkMatrix_preScale' > preScale< / a >
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< a name = 'SkMatrix_MakeTrans' > < / a >
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---
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< pre style = "padding: 1em 1em 1em 1em; width: 62.5em;background-color: #f0f0f0 " >
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static < a href = 'SkMatrix_Reference#SkMatrix' > SkMatrix< / a > < a href = '#SkMatrix_MakeTrans' > MakeTrans< / a > (< a href = 'undocumented#SkScalar' > SkScalar< / a > dx, < a href = 'undocumented#SkScalar' > SkScalar< / a > dy)
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< / pre >
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Sets < a href = 'SkMatrix_Reference#SkMatrix' > SkMatrix< / a > to translate by (< a href = '#SkMatrix_MakeTrans_dx' > dx< / a > , < a href = '#SkMatrix_MakeTrans_dy' > dy< / a > ). Returned < a href = 'SkMatrix_Reference#Matrix' > matrix< / a > is:
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| 1 0 < a href = '#SkMatrix_MakeTrans_dx' > dx< / a > |
| 0 1 < a href = '#SkMatrix_MakeTrans_dy' > dy< / a > |
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| 0 0 1 |
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### Parameters
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< table > < tr > < td > < a name = 'SkMatrix_MakeTrans_dx' > < code > < strong > dx< / strong > < / code > < / a > < / td >
< td > horizontal translation< / td >
< / tr >
< tr > < td > < a name = 'SkMatrix_MakeTrans_dy' > < code > < strong > dy< / strong > < / code > < / a > < / td >
< td > vertical translation< / td >
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< / tr >
< / table >
### Return Value
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< a href = 'SkMatrix_Reference#SkMatrix' > SkMatrix< / a > with translation
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### Example
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< div > < fiddle-embed name = "@Matrix_MakeTrans" > < / fiddle-embed > < / div >
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### See Also
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< a href = '#SkMatrix_setTranslate' > setTranslate< / a > < a href = '#SkMatrix_postTranslate' > postTranslate< / a > < a href = '#SkMatrix_preTranslate' > preTranslate< / a >
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< a name = 'SkMatrix_MakeAll' > < / a >
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---
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< pre style = "padding: 1em 1em 1em 1em; width: 62.5em;background-color: #f0f0f0 " >
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static < a href = 'SkMatrix_Reference#SkMatrix' > SkMatrix< / a > < a href = '#SkMatrix_MakeAll' > MakeAll< / a > (< a href = 'undocumented#SkScalar' > SkScalar< / a > scaleX, < a href = 'undocumented#SkScalar' > SkScalar< / a > skewX, < a href = 'undocumented#SkScalar' > SkScalar< / a > transX, < a href = 'undocumented#SkScalar' > SkScalar< / a > skewY,
< a href = 'undocumented#SkScalar' > SkScalar< / a > scaleY, < a href = 'undocumented#SkScalar' > SkScalar< / a > transY, < a href = 'undocumented#SkScalar' > SkScalar< / a > pers0, < a href = 'undocumented#SkScalar' > SkScalar< / a > pers1,
< a href = 'undocumented#SkScalar' > SkScalar< / a > pers2)
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< / pre >
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Sets < a href = 'SkMatrix_Reference#SkMatrix' > SkMatrix< / a > to:
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| < a href = '#SkMatrix_MakeAll_scaleX' > scaleX< / a > < a href = '#SkMatrix_MakeAll_skewX' > skewX< / a > < a href = '#SkMatrix_MakeAll_transX' > transX< / a > |
| < a href = '#SkMatrix_MakeAll_skewY' > skewY< / a > < a href = '#SkMatrix_MakeAll_scaleY' > scaleY< / a > < a href = '#SkMatrix_MakeAll_transY' > transY< / a > |
| < a href = '#SkMatrix_MakeAll_pers0' > pers0< / a > < a href = '#SkMatrix_MakeAll_pers1' > pers1< / a > < a href = '#SkMatrix_MakeAll_pers2' > pers2< / a > |
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### Parameters
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< table > < tr > < td > < a name = 'SkMatrix_MakeAll_scaleX' > < code > < strong > scaleX< / strong > < / code > < / a > < / td >
< td > horizontal scale factor< / td >
< / tr >
< tr > < td > < a name = 'SkMatrix_MakeAll_skewX' > < code > < strong > skewX< / strong > < / code > < / a > < / td >
< td > horizontal skew factor< / td >
< / tr >
< tr > < td > < a name = 'SkMatrix_MakeAll_transX' > < code > < strong > transX< / strong > < / code > < / a > < / td >
< td > horizontal translation< / td >
< / tr >
< tr > < td > < a name = 'SkMatrix_MakeAll_skewY' > < code > < strong > skewY< / strong > < / code > < / a > < / td >
< td > vertical skew factor< / td >
< / tr >
< tr > < td > < a name = 'SkMatrix_MakeAll_scaleY' > < code > < strong > scaleY< / strong > < / code > < / a > < / td >
< td > vertical scale factor< / td >
< / tr >
< tr > < td > < a name = 'SkMatrix_MakeAll_transY' > < code > < strong > transY< / strong > < / code > < / a > < / td >
< td > vertical translation< / td >
< / tr >
< tr > < td > < a name = 'SkMatrix_MakeAll_pers0' > < code > < strong > pers0< / strong > < / code > < / a > < / td >
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< td > input x-axis perspective factor< / td >
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< / tr >
< tr > < td > < a name = 'SkMatrix_MakeAll_pers1' > < code > < strong > pers1< / strong > < / code > < / a > < / td >
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< td > input y-axis perspective factor< / td >
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< / tr >
< tr > < td > < a name = 'SkMatrix_MakeAll_pers2' > < code > < strong > pers2< / strong > < / code > < / a > < / td >
< td > perspective scale factor< / td >
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< / tr >
< / table >
### Return Value
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< a href = 'SkMatrix_Reference#SkMatrix' > SkMatrix< / a > constructed from parameters
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### Example
< div > < fiddle-embed name = "6bad83b64de9266e323c29d550e04188" > < / fiddle-embed > < / div >
### See Also
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< a href = '#SkMatrix_setAll' > setAll< / a > < a href = '#SkMatrix_set9' > set9< / a > < a href = '#SkMatrix_postConcat' > postConcat< / a > < a href = '#SkMatrix_preConcat' > preConcat< / a >
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< a name = 'SkMatrix_TypeMask' > < / a >
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---
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< pre style = "padding: 1em 1em 1em 1em;width: 62.5em; background-color: #f0f0f0 " >
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enum < a href = '#SkMatrix_TypeMask' > TypeMask< / a > {
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< a href = '#SkMatrix_kIdentity_Mask' > kIdentity_Mask< / a > = 0,
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< a href = '#SkMatrix_kTranslate_Mask' > kTranslate_Mask< / a > = 0x01,
< a href = '#SkMatrix_kScale_Mask' > kScale_Mask< / a > = 0x02,
< a href = '#SkMatrix_kAffine_Mask' > kAffine_Mask< / a > = 0x04,
< a href = '#SkMatrix_kPerspective_Mask' > kPerspective_Mask< / a > = 0x08,
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};
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< / pre >
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Enumeration of bit fields for mask returned by < a href = '#SkMatrix_getType' > getType< / a > .
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Used to identify the complexity of < a href = 'SkMatrix_Reference#Matrix' > Matrix< / a > , to optimize performance.
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### Constants
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< table style = 'border-collapse: collapse; width: 62.5em' >
< tr >< th style = 'text-align: left; border: 2px solid #dddddd ; padding: 8px; ' > Const</ th >
< th style = 'text-align: center; border: 2px solid #dddddd ; padding: 8px; ' > Value</ th >
< th style = 'text-align: left; border: 2px solid #dddddd ; padding: 8px; ' > Description</ th ></ tr >
< tr style = 'background-color: #f0f0f0 ; ' >
< td style = 'text-align: left; border: 2px solid #dddddd ; padding: 8px; ' >< a name = 'SkMatrix_kIdentity_Mask' >< code > SkMatrix::kIdentity_Mask</ code ></ a ></ td >
< td style = 'text-align: center; border: 2px solid #dddddd ; padding: 8px; ' > 0</ td >
< td style = 'text-align: left; border: 2px solid #dddddd ; padding: 8px; ' >
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all bits clear if < a href = 'SkMatrix_Reference#Matrix' > Matrix< / a > is identity
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< / td >
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< / tr >
< tr >
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< td style = 'text-align: left; border: 2px solid #dddddd ; padding: 8px; ' >< a name = 'SkMatrix_kTranslate_Mask' >< code > SkMatrix::kTranslate_Mask</ code ></ a ></ td >
< td style = 'text-align: center; border: 2px solid #dddddd ; padding: 8px; ' > 1</ td >
< td style = 'text-align: left; border: 2px solid #dddddd ; padding: 8px; ' >
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set if < a href = 'SkMatrix_Reference#Matrix' > Matrix< / a > has translation
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< / td >
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< / tr >
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< tr style = 'background-color: #f0f0f0 ; ' >
< td style = 'text-align: left; border: 2px solid #dddddd ; padding: 8px; ' >< a name = 'SkMatrix_kScale_Mask' >< code > SkMatrix::kScale_Mask</ code ></ a ></ td >
< td style = 'text-align: center; border: 2px solid #dddddd ; padding: 8px; ' > 2</ td >
< td style = 'text-align: left; border: 2px solid #dddddd ; padding: 8px; ' >
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set if < a href = 'SkMatrix_Reference#Matrix' > Matrix< / a > scales x-axis or y-axis
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< / td >
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< / tr >
< tr >
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< td style = 'text-align: left; border: 2px solid #dddddd ; padding: 8px; ' >< a name = 'SkMatrix_kAffine_Mask' >< code > SkMatrix::kAffine_Mask</ code ></ a ></ td >
< td style = 'text-align: center; border: 2px solid #dddddd ; padding: 8px; ' > 4</ td >
< td style = 'text-align: left; border: 2px solid #dddddd ; padding: 8px; ' >
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set if < a href = 'SkMatrix_Reference#Matrix' > Matrix< / a > skews or rotates
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< / td >
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< / tr >
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< tr style = 'background-color: #f0f0f0 ; ' >
< td style = 'text-align: left; border: 2px solid #dddddd ; padding: 8px; ' >< a name = 'SkMatrix_kPerspective_Mask' >< code > SkMatrix::kPerspective_Mask</ code ></ a ></ td >
< td style = 'text-align: center; border: 2px solid #dddddd ; padding: 8px; ' > 8</ td >
< td style = 'text-align: left; border: 2px solid #dddddd ; padding: 8px; ' >
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set if < a href = 'SkMatrix_Reference#Matrix' > Matrix< / a > has perspective
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< / td >
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< / tr >
< / table >
### Example
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< div > < fiddle-embed name = "@Matrix_TypeMask" >
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#### Example Output
~~~~
after reset: kIdentity_Mask
after postTranslate: kTranslate_Mask
after postScale: kTranslate_Mask kScale_Mask
after postScale: kTranslate_Mask kScale_Mask kAffine_Mask
after setPolyToPoly: kTranslate_Mask kScale_Mask kAffine_Mask kPerspective_Mask
~~~~
< / fiddle-embed > < / div >
### See Also
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< a href = '#SkMatrix_getType' > getType< / a >
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< a name = 'Property' > < / a >
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< a name = 'SkMatrix_getType' > < / a >
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---
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< pre style = "padding: 1em 1em 1em 1em; width: 62.5em;background-color: #f0f0f0 " >
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< a href = '#SkMatrix_TypeMask' > TypeMask< / a > < a href = '#SkMatrix_getType' > getType< / a > ()const
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< / pre >
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Returns a bit field describing the transformations the < a href = 'SkMatrix_Reference#Matrix' > matrix< / a > may
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perform. The bit field is computed conservatively, so it may include
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false positives. For example, when < a href = '#SkMatrix_kPerspective_Mask' > kPerspective_Mask< / a > is set, all
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other bits are set.
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### Return Value
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< a href = '#SkMatrix_kIdentity_Mask' > kIdentity_Mask< / a > , or combinations of: < a href = '#SkMatrix_kTranslate_Mask' > kTranslate_Mask< / a > , < a href = '#SkMatrix_kScale_Mask' > kScale_Mask< / a > ,
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< a href = '#SkMatrix_kAffine_Mask' > kAffine_Mask< / a > , < a href = '#SkMatrix_kPerspective_Mask' > kPerspective_Mask< / a >
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### Example
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< div > < fiddle-embed name = "@Matrix_getType" >
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#### Example Output
~~~~
identity flags hex: 0 decimal: 0
set all flags hex: f decimal: 15
~~~~
< / fiddle-embed > < / div >
### See Also
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< a href = '#SkMatrix_TypeMask' > TypeMask< / a >
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< a name = 'SkMatrix_isIdentity' > < / a >
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---
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< pre style = "padding: 1em 1em 1em 1em; width: 62.5em;background-color: #f0f0f0 " >
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bool < a href = '#SkMatrix_isIdentity' > isIdentity< / a > ()const
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< / pre >
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Returns true if < a href = 'SkMatrix_Reference#SkMatrix' > SkMatrix< / a > is identity. Identity < a href = 'SkMatrix_Reference#Matrix' > matrix< / a > is:
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| 1 0 0 |
| 0 1 0 |
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| 0 0 1 |
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### Return Value
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true if < a href = 'SkMatrix_Reference#SkMatrix' > SkMatrix< / a > has no effect
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### Example
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< div > < fiddle-embed name = "@Matrix_isIdentity" >
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#### Example Output
~~~~
is identity: true
is identity: false
~~~~
< / fiddle-embed > < / div >
### See Also
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< a href = '#SkMatrix_reset' > reset()< / a > < a href = '#SkMatrix_setIdentity' > setIdentity< / a > < a href = '#SkMatrix_getType' > getType< / a >
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< a name = 'SkMatrix_isScaleTranslate' > < / a >
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---
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< pre style = "padding: 1em 1em 1em 1em; width: 62.5em;background-color: #f0f0f0 " >
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bool < a href = '#SkMatrix_isScaleTranslate' > isScaleTranslate< / a > ()const
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< / pre >
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Returns true if < a href = 'SkMatrix_Reference#SkMatrix' > SkMatrix< / a > at most scales and translates. < a href = 'SkMatrix_Reference#SkMatrix' > SkMatrix< / a > may be identity,
contain only scale elements, only translate elements, or both. < a href = 'SkMatrix_Reference#SkMatrix' > SkMatrix< / a > form is:
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| scale-x 0 translate-x |
| 0 scale-y translate-y |
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| 0 0 1 |
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### Return Value
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true if < a href = 'SkMatrix_Reference#SkMatrix' > SkMatrix< / a > is identity; or scales, translates, or both
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### Example
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< div > < fiddle-embed name = "@Matrix_isScaleTranslate" >
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#### Example Output
~~~~
is scale-translate: true
is scale-translate: true
is scale-translate: true
is scale-translate: true
~~~~
< / fiddle-embed > < / div >
### See Also
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< a href = '#SkMatrix_setScale' > setScale< / a > < a href = '#SkMatrix_isTranslate' > isTranslate< / a > < a href = '#SkMatrix_setTranslate' > setTranslate< / a > < a href = '#SkMatrix_getType' > getType< / a >
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< a name = 'SkMatrix_isTranslate' > < / a >
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---
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< pre style = "padding: 1em 1em 1em 1em; width: 62.5em;background-color: #f0f0f0 " >
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bool < a href = '#SkMatrix_isTranslate' > isTranslate< / a > ()const
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< / pre >
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Returns true if < a href = 'SkMatrix_Reference#SkMatrix' > SkMatrix< / a > is identity, or translates. < a href = 'SkMatrix_Reference#SkMatrix' > SkMatrix< / a > form is:
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| 1 0 translate-x |
| 0 1 translate-y |
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| 0 0 1 |
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### Return Value
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true if < a href = 'SkMatrix_Reference#SkMatrix' > SkMatrix< / a > is identity, or translates
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### Example
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< div > < fiddle-embed name = "@Matrix_isTranslate" >
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#### Example Output
~~~~
is translate: true
is translate: true
is translate: false
is translate: false
~~~~
< / fiddle-embed > < / div >
### See Also
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< a href = '#SkMatrix_setTranslate' > setTranslate< / a > < a href = '#SkMatrix_getType' > getType< / a >
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< a name = 'SkMatrix_rectStaysRect' > < / a >
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---
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< pre style = "padding: 1em 1em 1em 1em; width: 62.5em;background-color: #f0f0f0 " >
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bool < a href = '#SkMatrix_rectStaysRect' > rectStaysRect< / a > ()const
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< / pre >
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Returns true < a href = 'SkMatrix_Reference#SkMatrix' > SkMatrix< / a > maps < a href = 'SkRect_Reference#SkRect' > SkRect< / a > to another < a href = 'SkRect_Reference#SkRect' > SkRect< / a > . If true, < a href = 'SkMatrix_Reference#SkMatrix' > SkMatrix< / a > is identity,
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or scales, or rotates a multiple of 90 degrees, or mirrors on axes. In all
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cases, < a href = 'SkMatrix_Reference#SkMatrix' > SkMatrix< / a > may also have translation. < a href = 'SkMatrix_Reference#SkMatrix' > SkMatrix< / a > form is either:
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| scale-x 0 translate-x |
| 0 scale-y translate-y |
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| 0 0 1 |
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or
| 0 rotate-x translate-x |
| rotate-y 0 translate-y |
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| 0 0 1 |
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for non-zero values of scale-x, scale-y, rotate-x, and rotate-y.
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Also called < a href = '#SkMatrix_preservesAxisAlignment' > preservesAxisAlignment< / a > (); use the one that provides better inline
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documentation.
### Return Value
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true if < a href = 'SkMatrix_Reference#SkMatrix' > SkMatrix< / a > maps one < a href = 'SkRect_Reference#SkRect' > SkRect< / a > into another
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### Example
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< div > < fiddle-embed name = "@Matrix_rectStaysRect" >
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#### Example Output
~~~~
rectStaysRect: true
rectStaysRect: true
rectStaysRect: true
rectStaysRect: true
~~~~
< / fiddle-embed > < / div >
### See Also
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< a href = '#SkMatrix_preservesAxisAlignment' > preservesAxisAlignment< / a > < a href = '#SkMatrix_preservesRightAngles' > preservesRightAngles< / a >
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< a name = 'SkMatrix_preservesAxisAlignment' > < / a >
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---
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< pre style = "padding: 1em 1em 1em 1em; width: 62.5em;background-color: #f0f0f0 " >
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bool < a href = '#SkMatrix_preservesAxisAlignment' > preservesAxisAlignment< / a > ()const
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< / pre >
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Returns true < a href = 'SkMatrix_Reference#SkMatrix' > SkMatrix< / a > maps < a href = 'SkRect_Reference#SkRect' > SkRect< / a > to another < a href = 'SkRect_Reference#SkRect' > SkRect< / a > . If true, < a href = 'SkMatrix_Reference#SkMatrix' > SkMatrix< / a > is identity,
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or scales, or rotates a multiple of 90 degrees, or mirrors on axes. In all
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cases, < a href = 'SkMatrix_Reference#SkMatrix' > SkMatrix< / a > may also have translation. < a href = 'SkMatrix_Reference#SkMatrix' > SkMatrix< / a > form is either:
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| scale-x 0 translate-x |
| 0 scale-y translate-y |
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| 0 0 1 |
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or
| 0 rotate-x translate-x |
| rotate-y 0 translate-y |
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| 0 0 1 |
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for non-zero values of scale-x, scale-y, rotate-x, and rotate-y.
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Also called < a href = '#SkMatrix_rectStaysRect' > rectStaysRect< / a > (); use the one that provides better inline
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documentation.
### Return Value
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true if < a href = 'SkMatrix_Reference#SkMatrix' > SkMatrix< / a > maps one < a href = 'SkRect_Reference#SkRect' > SkRect< / a > into another
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### Example
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< div > < fiddle-embed name = "@Matrix_preservesAxisAlignment" >
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#### Example Output
~~~~
preservesAxisAlignment: true
preservesAxisAlignment: true
preservesAxisAlignment: true
preservesAxisAlignment: true
~~~~
< / fiddle-embed > < / div >
### See Also
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< a href = '#SkMatrix_rectStaysRect' > rectStaysRect< / a > < a href = '#SkMatrix_preservesRightAngles' > preservesRightAngles< / a >
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< a name = 'SkMatrix_hasPerspective' > < / a >
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---
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< pre style = "padding: 1em 1em 1em 1em; width: 62.5em;background-color: #f0f0f0 " >
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bool < a href = '#SkMatrix_hasPerspective' > hasPerspective< / a > ()const
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< / pre >
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Returns true if the < a href = 'SkMatrix_Reference#Matrix' > matrix< / a > contains perspective elements. < a href = 'SkMatrix_Reference#SkMatrix' > SkMatrix< / a > form is:
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| -- -- -- |
| -- -- -- |
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| perspective-x perspective-y perspective-scale |
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where perspective-x or perspective-y is non-zero, or perspective-scale is
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not one. All other elements may have any value.
### Return Value
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true if < a href = 'SkMatrix_Reference#SkMatrix' > SkMatrix< / a > is in most general form
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### Example
< div > < fiddle-embed name = "688123908c733169bbbfaf11f41ecff6" > < / fiddle-embed > < / div >
### See Also
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< a href = '#SkMatrix_setAll' > setAll< / a > < a href = '#SkMatrix_set9' > set9< / a > < a href = '#SkMatrix_MakeAll' > MakeAll< / a >
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< a name = 'SkMatrix_isSimilarity' > < / a >
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---
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< pre style = "padding: 1em 1em 1em 1em; width: 62.5em;background-color: #f0f0f0 " >
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bool < a href = '#SkMatrix_isSimilarity' > isSimilarity< / a > (< a href = 'undocumented#SkScalar' > SkScalar< / a > tol = < a href = 'undocumented#SK_ScalarNearlyZero' > SK_ScalarNearlyZero< / a > )const
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< / pre >
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Returns true if < a href = 'SkMatrix_Reference#SkMatrix' > SkMatrix< / a > contains only translation, rotation, reflection, and
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uniform scale.
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Returns false if < a href = 'SkMatrix_Reference#SkMatrix' > SkMatrix< / a > contains different scales, skewing, perspective, or
degenerate forms that collapse to a < a href = 'undocumented#Line' > line< / a > or < a href = 'SkPoint_Reference#Point' > point< / a > .
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Describes that the < a href = 'SkMatrix_Reference#SkMatrix' > SkMatrix< / a > makes rendering with and without the < a href = 'SkMatrix_Reference#Matrix' > matrix< / a > are
visually alike; a transformed < a href = 'undocumented#Circle' > circle< / a > remains a < a href = 'undocumented#Circle' > circle< / a > . Mathematically, this is
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referred to as similarity of a < a href = 'undocumented#Euclidean_Space' > Euclidean space< / a > , or a similarity transformation.
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Preserves right angles, keeping the arms of the angle equal lengths.
### Parameters
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< table > < tr > < td > < a name = 'SkMatrix_isSimilarity_tol' > < code > < strong > tol< / strong > < / code > < / a > < / td >
< td > to be deprecated< / td >
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< / tr >
< / table >
### Return Value
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true if < a href = 'SkMatrix_Reference#SkMatrix' > SkMatrix< / a > only rotates, uniformly scales, translates
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### Example
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< div > < fiddle-embed name = "8b37f4ae7fec1756433c0f984175fb14" > < div > < a href = 'undocumented#String' > String< / a > is drawn four times through but only two are visible. Drawing the pair
with < a href = '#SkMatrix_isSimilarity' > isSimilarity< / a > false reveals the pair not visible through the < a href = 'SkMatrix_Reference#Matrix' > matrix< / a > .
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< / div > < / fiddle-embed > < / div >
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### See Also
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< a href = '#SkMatrix_isScaleTranslate' > isScaleTranslate< / a > < a href = '#SkMatrix_preservesRightAngles' > preservesRightAngles< / a > < a href = '#SkMatrix_rectStaysRect' > rectStaysRect< / a > < a href = '#SkMatrix_isFixedStepInX' > isFixedStepInX< / a >
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< a name = 'SkMatrix_preservesRightAngles' > < / a >
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---
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< pre style = "padding: 1em 1em 1em 1em; width: 62.5em;background-color: #f0f0f0 " >
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bool < a href = '#SkMatrix_preservesRightAngles' > preservesRightAngles< / a > (< a href = 'undocumented#SkScalar' > SkScalar< / a > tol = < a href = 'undocumented#SK_ScalarNearlyZero' > SK_ScalarNearlyZero< / a > )const
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< / pre >
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Returns true if < a href = 'SkMatrix_Reference#SkMatrix' > SkMatrix< / a > contains only translation, rotation, reflection, and
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scale. Scale may differ along rotated axes.
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Returns false if < a href = 'SkMatrix_Reference#SkMatrix' > SkMatrix< / a > skewing, perspective, or degenerate forms that collapse
to a < a href = 'undocumented#Line' > line< / a > or < a href = 'SkPoint_Reference#Point' > point< / a > .
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Preserves right angles, but not requiring that the arms of the angle
retain equal lengths.
### Parameters
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< table > < tr > < td > < a name = 'SkMatrix_preservesRightAngles_tol' > < code > < strong > tol< / strong > < / code > < / a > < / td >
< td > to be deprecated< / td >
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< / tr >
< / table >
### Return Value
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true if < a href = 'SkMatrix_Reference#SkMatrix' > SkMatrix< / a > only rotates, scales, translates
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### Example
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< div > < fiddle-embed name = "b9becf0dc24a9f00726e24a81fb72f16" > < div > Equal scale is both similar and preserves right angles.
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Unequal scale is not similar but preserves right angles.
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Skews are not similar and do not preserve right angles.
< / div > < / fiddle-embed > < / div >
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### See Also
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< a href = '#SkMatrix_isScaleTranslate' > isScaleTranslate< / a > < a href = '#SkMatrix_isSimilarity' > isSimilarity< / a > < a href = '#SkMatrix_rectStaysRect' > rectStaysRect< / a > < a href = '#SkMatrix_isFixedStepInX' > isFixedStepInX< / a >
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< a name = 'MemberIndex' > < / a >
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---
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< pre style = "padding: 1em 1em 1em 1em;width: 62.5em; background-color: #f0f0f0 " >
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static constexpr int < a href = '#SkMatrix_kMScaleX' > kMScaleX< / a > = 0;
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static constexpr int < a href = '#SkMatrix_kMSkewX' > kMSkewX< / a > = 1;
static constexpr int < a href = '#SkMatrix_kMTransX' > kMTransX< / a > = 2;
static constexpr int < a href = '#SkMatrix_kMSkewY' > kMSkewY< / a > = 3;
static constexpr int < a href = '#SkMatrix_kMScaleY' > kMScaleY< / a > = 4;
static constexpr int < a href = '#SkMatrix_kMTransY' > kMTransY< / a > = 5;
static constexpr int < a href = '#SkMatrix_kMPersp0' > kMPersp0< / a > = 6;
static constexpr int < a href = '#SkMatrix_kMPersp1' > kMPersp1< / a > = 7;
static constexpr int < a href = '#SkMatrix_kMPersp2' > kMPersp2< / a > = 8;
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< / pre >
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< a href = 'SkMatrix_Reference#Matrix' > Matrix< / a > organizes its values in row order. These members correspond to
each value in < a href = 'SkMatrix_Reference#Matrix' > Matrix< / a > .
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### Constants
< table style = 'border-collapse: collapse; width: 62.5em' >
< tr >< th style = 'text-align: left; border: 2px solid #dddddd ; padding: 8px; ' > Const</ th >
< th style = 'text-align: center; border: 2px solid #dddddd ; padding: 8px; ' > Value</ th >
< th style = 'text-align: left; border: 2px solid #dddddd ; padding: 8px; ' > Description</ th ></ tr >
< tr style = 'background-color: #f0f0f0 ; ' >
< td style = 'text-align: left; border: 2px solid #dddddd ; padding: 8px; ' >< a name = 'SkMatrix_kMScaleX' >< code > SkMatrix::kMScaleX</ code ></ a ></ td >
< td style = 'text-align: center; border: 2px solid #dddddd ; padding: 8px; ' > 0</ td >
< td style = 'text-align: left; border: 2px solid #dddddd ; padding: 8px; ' >
horizontal scale factor< / td >
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< / tr >
< tr >
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< td style = 'text-align: left; border: 2px solid #dddddd ; padding: 8px; ' >< a name = 'SkMatrix_kMSkewX' >< code > SkMatrix::kMSkewX</ code ></ a ></ td >
< td style = 'text-align: center; border: 2px solid #dddddd ; padding: 8px; ' > 1</ td >
< td style = 'text-align: left; border: 2px solid #dddddd ; padding: 8px; ' >
horizontal skew factor< / td >
< / tr >
< tr style = 'background-color: #f0f0f0 ; ' >
< td style = 'text-align: left; border: 2px solid #dddddd ; padding: 8px; ' >< a name = 'SkMatrix_kMTransX' >< code > SkMatrix::kMTransX</ code ></ a ></ td >
< td style = 'text-align: center; border: 2px solid #dddddd ; padding: 8px; ' > 2</ td >
< td style = 'text-align: left; border: 2px solid #dddddd ; padding: 8px; ' >
horizontal translation< / td >
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< / tr >
< tr >
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< td style = 'text-align: left; border: 2px solid #dddddd ; padding: 8px; ' >< a name = 'SkMatrix_kMSkewY' >< code > SkMatrix::kMSkewY</ code ></ a ></ td >
< td style = 'text-align: center; border: 2px solid #dddddd ; padding: 8px; ' > 3</ td >
< td style = 'text-align: left; border: 2px solid #dddddd ; padding: 8px; ' >
vertical skew factor< / td >
< / tr >
< tr style = 'background-color: #f0f0f0 ; ' >
< td style = 'text-align: left; border: 2px solid #dddddd ; padding: 8px; ' >< a name = 'SkMatrix_kMScaleY' >< code > SkMatrix::kMScaleY</ code ></ a ></ td >
< td style = 'text-align: center; border: 2px solid #dddddd ; padding: 8px; ' > 4</ td >
< td style = 'text-align: left; border: 2px solid #dddddd ; padding: 8px; ' >
vertical scale factor< / td >
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< / tr >
< tr >
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< td style = 'text-align: left; border: 2px solid #dddddd ; padding: 8px; ' >< a name = 'SkMatrix_kMTransY' >< code > SkMatrix::kMTransY</ code ></ a ></ td >
< td style = 'text-align: center; border: 2px solid #dddddd ; padding: 8px; ' > 5</ td >
< td style = 'text-align: left; border: 2px solid #dddddd ; padding: 8px; ' >
vertical translation< / td >
< / tr >
< tr style = 'background-color: #f0f0f0 ; ' >
< td style = 'text-align: left; border: 2px solid #dddddd ; padding: 8px; ' >< a name = 'SkMatrix_kMPersp0' >< code > SkMatrix::kMPersp0</ code ></ a ></ td >
< td style = 'text-align: center; border: 2px solid #dddddd ; padding: 8px; ' > 6</ td >
< td style = 'text-align: left; border: 2px solid #dddddd ; padding: 8px; ' >
input x perspective factor< / td >
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< / tr >
< tr >
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< td style = 'text-align: left; border: 2px solid #dddddd ; padding: 8px; ' >< a name = 'SkMatrix_kMPersp1' >< code > SkMatrix::kMPersp1</ code ></ a ></ td >
< td style = 'text-align: center; border: 2px solid #dddddd ; padding: 8px; ' > 7</ td >
< td style = 'text-align: left; border: 2px solid #dddddd ; padding: 8px; ' >
input y perspective factor< / td >
< / tr >
< tr style = 'background-color: #f0f0f0 ; ' >
< td style = 'text-align: left; border: 2px solid #dddddd ; padding: 8px; ' >< a name = 'SkMatrix_kMPersp2' >< code > SkMatrix::kMPersp2</ code ></ a ></ td >
< td style = 'text-align: center; border: 2px solid #dddddd ; padding: 8px; ' > 8</ td >
< td style = 'text-align: left; border: 2px solid #dddddd ; padding: 8px; ' >
perspective bias< / td >
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< / tr >
< / table >
### Example
< div > < fiddle-embed name = "3bbf75f4748420810aa2586e3c8548d9" > < / fiddle-embed > < / div >
### See Also
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< a href = '#SkMatrix_get' > get()< / a > < a href = '#SkMatrix_set' > set()< / a >
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< a name = 'AffineIndex' > < / a >
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2018-10-16 14:30:28 +00:00
---
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2017-11-27 15:44:06 +00:00
< pre style = "padding: 1em 1em 1em 1em;width: 62.5em; background-color: #f0f0f0 " >
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< / pre >
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Affine arrays are in column major order to match the < a href = 'SkMatrix_Reference#Matrix' > matrix< / a > used by
PDF and XPS.
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### Constants
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< table style = 'border-collapse: collapse; width: 62.5em' >
< tr >< th style = 'text-align: left; border: 2px solid #dddddd ; padding: 8px; ' > Const</ th >
< th style = 'text-align: center; border: 2px solid #dddddd ; padding: 8px; ' > Value</ th >
< th style = 'text-align: left; border: 2px solid #dddddd ; padding: 8px; ' > Description</ th ></ tr >
< tr style = 'background-color: #f0f0f0 ; ' >
< td style = 'text-align: left; border: 2px solid #dddddd ; padding: 8px; ' >< a name = 'SkMatrix_kAScaleX' >< code > SkMatrix::kAScaleX</ code ></ a ></ td >
< td style = 'text-align: center; border: 2px solid #dddddd ; padding: 8px; ' > 0</ td >
< td style = 'text-align: left; border: 2px solid #dddddd ; padding: 8px; ' >
horizontal scale factor< / td >
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< / tr >
< tr >
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< td style = 'text-align: left; border: 2px solid #dddddd ; padding: 8px; ' >< a name = 'SkMatrix_kASkewY' >< code > SkMatrix::kASkewY</ code ></ a ></ td >
< td style = 'text-align: center; border: 2px solid #dddddd ; padding: 8px; ' > 1</ td >
< td style = 'text-align: left; border: 2px solid #dddddd ; padding: 8px; ' >
vertical skew factor< / td >
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< / tr >
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< tr style = 'background-color: #f0f0f0 ; ' >
< td style = 'text-align: left; border: 2px solid #dddddd ; padding: 8px; ' >< a name = 'SkMatrix_kASkewX' >< code > SkMatrix::kASkewX</ code ></ a ></ td >
< td style = 'text-align: center; border: 2px solid #dddddd ; padding: 8px; ' > 2</ td >
< td style = 'text-align: left; border: 2px solid #dddddd ; padding: 8px; ' >
horizontal skew factor< / td >
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< / tr >
< tr >
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< td style = 'text-align: left; border: 2px solid #dddddd ; padding: 8px; ' >< a name = 'SkMatrix_kAScaleY' >< code > SkMatrix::kAScaleY</ code ></ a ></ td >
< td style = 'text-align: center; border: 2px solid #dddddd ; padding: 8px; ' > 3</ td >
< td style = 'text-align: left; border: 2px solid #dddddd ; padding: 8px; ' >
vertical scale factor< / td >
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< / tr >
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< tr style = 'background-color: #f0f0f0 ; ' >
< td style = 'text-align: left; border: 2px solid #dddddd ; padding: 8px; ' >< a name = 'SkMatrix_kATransX' >< code > SkMatrix::kATransX</ code ></ a ></ td >
< td style = 'text-align: center; border: 2px solid #dddddd ; padding: 8px; ' > 4</ td >
< td style = 'text-align: left; border: 2px solid #dddddd ; padding: 8px; ' >
horizontal translation< / td >
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< / tr >
< tr >
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< td style = 'text-align: left; border: 2px solid #dddddd ; padding: 8px; ' >< a name = 'SkMatrix_kATransY' >< code > SkMatrix::kATransY</ code ></ a ></ td >
< td style = 'text-align: center; border: 2px solid #dddddd ; padding: 8px; ' > 5</ td >
< td style = 'text-align: left; border: 2px solid #dddddd ; padding: 8px; ' >
vertical translation< / td >
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< / tr >
< / table >
### See Also
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< a href = '#SkMatrix_SetAffineIdentity' > SetAffineIdentity< / a > < a href = '#SkMatrix_asAffine' > asAffine< / a > < a href = '#SkMatrix_setAffine' > setAffine< / a >
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< a name = 'SkMatrix_array_operator' > < / a >
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---
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< pre style = "padding: 1em 1em 1em 1em; width: 62.5em;background-color: #f0f0f0 " >
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< a href = 'undocumented#SkScalar' > SkScalar< / a > < a href = '#SkMatrix_array1_operator' > operator[]< / a > (int index)const
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< / pre >
### Example
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< div > < fiddle-embed name = "@Matrix_array_operator" >
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#### Example Output
~~~~
matrix[SkMatrix::kMScaleX] == 42
matrix[SkMatrix::kMScaleY] == 24
~~~~
< / fiddle-embed > < / div >
### See Also
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< a href = '#SkMatrix_get' > get< / a > < a href = '#SkMatrix_set' > set< / a >
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< a name = 'SkMatrix_get' > < / a >
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---
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< pre style = "padding: 1em 1em 1em 1em; width: 62.5em;background-color: #f0f0f0 " >
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< a href = 'undocumented#SkScalar' > SkScalar< / a > get(int index)const
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< / pre >
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Returns one < a href = 'SkMatrix_Reference#Matrix' > matrix< / a > value. Asserts if < a href = '#SkMatrix_get_index' > index< / a > is out of range and SK_DEBUG is
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defined.
### Parameters
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< table > < tr > < td > < a name = 'SkMatrix_get_index' > < code > < strong > index< / strong > < / code > < / a > < / td >
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< td > one of: < a href = '#SkMatrix_kMScaleX' > kMScaleX< / a > , < a href = '#SkMatrix_kMSkewX' > kMSkewX< / a > , < a href = '#SkMatrix_kMTransX' > kMTransX< / a > , < a href = '#SkMatrix_kMSkewY' > kMSkewY< / a > , < a href = '#SkMatrix_kMScaleY' > kMScaleY< / a > , < a href = '#SkMatrix_kMTransY' > kMTransY< / a > ,< / td >
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< / tr >
< / table >
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< a href = '#SkMatrix_kMPersp0' > kMPersp0< / a > , < a href = '#SkMatrix_kMPersp1' > kMPersp1< / a > , < a href = '#SkMatrix_kMPersp2' > kMPersp2< / a >
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### Return Value
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value corresponding to < a href = '#SkMatrix_get_index' > index< / a >
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### Example
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< div > < fiddle-embed name = "@Matrix_get" >
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#### Example Output
~~~~
matrix.get(SkMatrix::kMSkewX) == 42
matrix.get(SkMatrix::kMSkewY) == 24
~~~~
< / fiddle-embed > < / div >
### See Also
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< a href = '#SkMatrix_array1_operator' > operator[]< / a > (int < a href = '#SkMatrix_get_index' > index< / a > ) < a href = '#SkMatrix_set' > set< / a >
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< a name = 'SkMatrix_getScaleX' > < / a >
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---
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< pre style = "padding: 1em 1em 1em 1em; width: 62.5em;background-color: #f0f0f0 " >
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< a href = 'undocumented#SkScalar' > SkScalar< / a > < a href = '#SkMatrix_getScaleX' > getScaleX< / a > ()const
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< / pre >
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Returns scale factor multiplied by x-axis input, contributing to x-axis output.
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With < a href = '#SkMatrix_mapPoints' > mapPoints< / a > (), scales < a href = 'SkPoint_Reference#SkPoint' > SkPoint< / a > along the x-axis.
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### Return Value
horizontal scale factor
### Example
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< div > < fiddle-embed name = "@Matrix_getScaleX" >
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#### Example Output
~~~~
matrix.getScaleX() == 42
~~~~
< / fiddle-embed > < / div >
### See Also
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< a href = '#SkMatrix_get' > get< / a > < a href = '#SkMatrix_getScaleY' > getScaleY< / a > < a href = '#SkMatrix_setScaleX' > setScaleX< / a > < a href = '#SkMatrix_setScale' > setScale< / a >
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< a name = 'SkMatrix_getScaleY' > < / a >
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---
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< pre style = "padding: 1em 1em 1em 1em; width: 62.5em;background-color: #f0f0f0 " >
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< a href = 'undocumented#SkScalar' > SkScalar< / a > < a href = '#SkMatrix_getScaleY' > getScaleY< / a > ()const
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< / pre >
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Returns scale factor multiplied by y-axis input, contributing to y-axis output.
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With < a href = '#SkMatrix_mapPoints' > mapPoints< / a > (), scales < a href = 'SkPoint_Reference#SkPoint' > SkPoint< / a > along the y-axis.
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### Return Value
vertical scale factor
### Example
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< div > < fiddle-embed name = "@Matrix_getScaleY" >
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#### Example Output
~~~~
matrix.getScaleY() == 24
~~~~
< / fiddle-embed > < / div >
### See Also
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< a href = '#SkMatrix_get' > get< / a > < a href = '#SkMatrix_getScaleX' > getScaleX< / a > < a href = '#SkMatrix_setScaleY' > setScaleY< / a > < a href = '#SkMatrix_setScale' > setScale< / a >
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< a name = 'SkMatrix_getSkewY' > < / a >
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---
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< pre style = "padding: 1em 1em 1em 1em; width: 62.5em;background-color: #f0f0f0 " >
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< a href = 'undocumented#SkScalar' > SkScalar< / a > < a href = '#SkMatrix_getSkewY' > getSkewY< / a > ()const
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< / pre >
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Returns scale factor multiplied by x-axis input, contributing to y-axis output.
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With < a href = '#SkMatrix_mapPoints' > mapPoints< / a > (), skews < a href = 'SkPoint_Reference#SkPoint' > SkPoint< / a > along the y-axis.
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Skewing both axes can rotate < a href = 'SkPoint_Reference#SkPoint' > SkPoint< / a > .
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### Return Value
vertical skew factor
### Example
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< div > < fiddle-embed name = "@Matrix_getSkewY" >
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#### Example Output
~~~~
matrix.getSkewY() == 24
~~~~
< / fiddle-embed > < / div >
### See Also
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< a href = '#SkMatrix_get' > get< / a > < a href = '#SkMatrix_getSkewX' > getSkewX< / a > < a href = '#SkMatrix_setSkewY' > setSkewY< / a > < a href = '#SkMatrix_setSkew' > setSkew< / a >
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< a name = 'SkMatrix_getSkewX' > < / a >
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---
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< pre style = "padding: 1em 1em 1em 1em; width: 62.5em;background-color: #f0f0f0 " >
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< a href = 'undocumented#SkScalar' > SkScalar< / a > < a href = '#SkMatrix_getSkewX' > getSkewX< / a > ()const
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< / pre >
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Returns scale factor multiplied by y-axis input, contributing to x-axis output.
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With < a href = '#SkMatrix_mapPoints' > mapPoints< / a > (), skews < a href = 'SkPoint_Reference#SkPoint' > SkPoint< / a > along the x-axis.
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Skewing both axes can rotate < a href = 'SkPoint_Reference#SkPoint' > SkPoint< / a > .
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### Return Value
horizontal scale factor
### Example
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< div > < fiddle-embed name = "@Matrix_getSkewX" >
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#### Example Output
~~~~
matrix.getSkewX() == 42
~~~~
< / fiddle-embed > < / div >
### See Also
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< a href = '#SkMatrix_get' > get< / a > < a href = '#SkMatrix_getSkewY' > getSkewY< / a > < a href = '#SkMatrix_setSkewX' > setSkewX< / a > < a href = '#SkMatrix_setSkew' > setSkew< / a >
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< a name = 'SkMatrix_getTranslateX' > < / a >
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---
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< pre style = "padding: 1em 1em 1em 1em; width: 62.5em;background-color: #f0f0f0 " >
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< a href = 'undocumented#SkScalar' > SkScalar< / a > < a href = '#SkMatrix_getTranslateX' > getTranslateX< / a > ()const
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< / pre >
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Returns translation contributing to x-axis output.
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With < a href = '#SkMatrix_mapPoints' > mapPoints< / a > (), moves < a href = 'SkPoint_Reference#SkPoint' > SkPoint< / a > along the x-axis.
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### Return Value
horizontal translation factor
### Example
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< div > < fiddle-embed name = "@Matrix_getTranslateX" >
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#### Example Output
~~~~
matrix.getTranslateX() == 42
~~~~
< / fiddle-embed > < / div >
### See Also
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< a href = '#SkMatrix_get' > get< / a > < a href = '#SkMatrix_getTranslateY' > getTranslateY< / a > < a href = '#SkMatrix_setTranslateX' > setTranslateX< / a > < a href = '#SkMatrix_setTranslate' > setTranslate< / a >
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< a name = 'SkMatrix_getTranslateY' > < / a >
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---
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< pre style = "padding: 1em 1em 1em 1em; width: 62.5em;background-color: #f0f0f0 " >
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< a href = 'undocumented#SkScalar' > SkScalar< / a > < a href = '#SkMatrix_getTranslateY' > getTranslateY< / a > ()const
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< / pre >
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Returns translation contributing to y-axis output.
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With < a href = '#SkMatrix_mapPoints' > mapPoints< / a > (), moves < a href = 'SkPoint_Reference#SkPoint' > SkPoint< / a > along the y-axis.
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### Return Value
vertical translation factor
### Example
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< div > < fiddle-embed name = "@Matrix_getTranslateY" >
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#### Example Output
~~~~
matrix.getTranslateY() == 24
~~~~
< / fiddle-embed > < / div >
### See Also
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< a href = '#SkMatrix_get' > get< / a > < a href = '#SkMatrix_getTranslateX' > getTranslateX< / a > < a href = '#SkMatrix_setTranslateY' > setTranslateY< / a > < a href = '#SkMatrix_setTranslate' > setTranslate< / a >
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< a name = 'SkMatrix_getPerspX' > < / a >
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---
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< pre style = "padding: 1em 1em 1em 1em; width: 62.5em;background-color: #f0f0f0 " >
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< a href = 'undocumented#SkScalar' > SkScalar< / a > < a href = '#SkMatrix_getPerspX' > getPerspX< / a > ()const
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< / pre >
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Returns factor scaling input x-axis relative to input y-axis.
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### Return Value
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input x-axis perspective factor
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### Example
< div > < fiddle-embed name = "a0f5bf4b55e8c33bfda29bf67e34306f" > < / fiddle-embed > < / div >
### See Also
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< a href = '#SkMatrix_kMPersp0' > kMPersp0< / a > < a href = '#SkMatrix_getPerspY' > getPerspY< / a >
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< a name = 'SkMatrix_getPerspY' > < / a >
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---
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< pre style = "padding: 1em 1em 1em 1em; width: 62.5em;background-color: #f0f0f0 " >
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< a href = 'undocumented#SkScalar' > SkScalar< / a > < a href = '#SkMatrix_getPerspY' > getPerspY< / a > ()const
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< / pre >
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Returns factor scaling input y-axis relative to input x-axis.
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### Return Value
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input y-axis perspective factor
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### Example
< div > < fiddle-embed name = "424a00a73675dbd99ad20feb0267442b" > < / fiddle-embed > < / div >
### See Also
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< a href = '#SkMatrix_kMPersp1' > kMPersp1< / a > < a href = '#SkMatrix_getPerspX' > getPerspX< / a >
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< a name = 'SkMatrix_array1_operator' > < / a >
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---
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< pre style = "padding: 1em 1em 1em 1em; width: 62.5em;background-color: #f0f0f0 " >
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< a href = 'undocumented#SkScalar' > SkScalar< / a > & < a href = '#SkMatrix_array1_operator' > operator[]< / a > (int index)
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< / pre >
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### Example
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< div > < fiddle-embed name = "@Matrix_dirtyMatrixTypeCache" >
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#### Example Output
~~~~
with identity matrix: x = 24
after skew x mod: x = 24
after 2nd skew x mod: x = 24
after dirty cache: x = 66
~~~~
< / fiddle-embed > < / div >
### See Also
< a href = '#SkMatrix_get' > get< / a > < a href = '#SkMatrix_dirtyMatrixTypeCache' > dirtyMatrixTypeCache< / a > < a href = '#SkMatrix_set' > set< / a >
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< a name = 'Set' > < / a >
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< a name = 'SkMatrix_set' > < / a >
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---
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< pre style = "padding: 1em 1em 1em 1em; width: 62.5em;background-color: #f0f0f0 " >
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void set(int index, < a href = 'undocumented#SkScalar' > SkScalar< / a > value)
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< / pre >
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Sets < a href = 'SkMatrix_Reference#SkMatrix' > SkMatrix< / a > < a href = '#SkMatrix_set_value' > value< / a > . Asserts if < a href = '#SkMatrix_set_index' > index< / a > is out of range and SK_DEBUG is
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defined. Safer than operator[]; internal cache is always maintained.
### Parameters
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< table > < tr > < td > < a name = 'SkMatrix_set_index' > < code > < strong > index< / strong > < / code > < / a > < / td >
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< td > one of: < a href = '#SkMatrix_kMScaleX' > kMScaleX< / a > , < a href = '#SkMatrix_kMSkewX' > kMSkewX< / a > , < a href = '#SkMatrix_kMTransX' > kMTransX< / a > , < a href = '#SkMatrix_kMSkewY' > kMSkewY< / a > , < a href = '#SkMatrix_kMScaleY' > kMScaleY< / a > , < a href = '#SkMatrix_kMTransY' > kMTransY< / a > ,< / td >
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< / tr >
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< / table >
< a href = '#SkMatrix_kMPersp0' > kMPersp0< / a > , < a href = '#SkMatrix_kMPersp1' > kMPersp1< / a > , < a href = '#SkMatrix_kMPersp2' > kMPersp2< / a >
### Parameters
< table > < tr > < td > < a name = 'SkMatrix_set_value' > < code > < strong > value< / strong > < / code > < / a > < / td >
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< td > < a href = 'undocumented#Scalar' > scalar< / a > to store in < a href = 'SkMatrix_Reference#SkMatrix' > SkMatrix< / a > < / td >
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< / tr >
< / table >
### Example
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< div > < fiddle-embed name = "@Matrix_set" >
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#### Example Output
~~~~
with identity matrix: x = 24
after skew x mod: x = 24
after 2nd skew x mod: x = 66
~~~~
< / fiddle-embed > < / div >
### See Also
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operator[] < a href = '#SkMatrix_get' > get< / a >
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2018-05-16 11:07:07 +00:00
< a name = 'SkMatrix_setScaleX' > < / a >
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---
2017-10-26 11:58:48 +00:00
2018-05-16 11:07:07 +00:00
< pre style = "padding: 1em 1em 1em 1em; width: 62.5em;background-color: #f0f0f0 " >
2018-11-09 21:04:58 +00:00
void < a href = '#SkMatrix_setScaleX' > setScaleX< / a > (< a href = 'undocumented#SkScalar' > SkScalar< / a > v)
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< / pre >
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Sets horizontal scale factor.
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### Parameters
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< table > < tr > < td > < a name = 'SkMatrix_setScaleX_v' > < code > < strong > v< / strong > < / code > < / a > < / td >
< td > horizontal scale factor to store< / td >
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< / tr >
< / table >
### Example
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< div > < fiddle-embed name = "a39dfed98c3c3c3a56be9ad59fe4e21e" > < / fiddle-embed > < / div >
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### See Also
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< a href = '#SkMatrix_set' > set< / a > < a href = '#SkMatrix_setScale' > setScale< / a > < a href = '#SkMatrix_setScaleY' > setScaleY< / a >
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2018-05-16 11:07:07 +00:00
< a name = 'SkMatrix_setScaleY' > < / a >
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---
2017-10-26 11:58:48 +00:00
2018-05-16 11:07:07 +00:00
< pre style = "padding: 1em 1em 1em 1em; width: 62.5em;background-color: #f0f0f0 " >
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void < a href = '#SkMatrix_setScaleY' > setScaleY< / a > (< a href = 'undocumented#SkScalar' > SkScalar< / a > v)
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< / pre >
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Sets vertical scale factor.
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### Parameters
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< table > < tr > < td > < a name = 'SkMatrix_setScaleY_v' > < code > < strong > v< / strong > < / code > < / a > < / td >
< td > vertical scale factor to store< / td >
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< / tr >
< / table >
### Example
< div > < fiddle-embed name = "f040c6dd85a02e94eaca00d5c2832604" > < / fiddle-embed > < / div >
### See Also
2018-11-07 19:59:03 +00:00
< a href = '#SkMatrix_set' > set< / a > < a href = '#SkMatrix_setScale' > setScale< / a > < a href = '#SkMatrix_setScaleX' > setScaleX< / a >
2017-10-26 11:58:48 +00:00
2018-05-16 11:07:07 +00:00
< a name = 'SkMatrix_setSkewY' > < / a >
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---
2017-10-26 11:58:48 +00:00
2018-05-16 11:07:07 +00:00
< pre style = "padding: 1em 1em 1em 1em; width: 62.5em;background-color: #f0f0f0 " >
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void < a href = '#SkMatrix_setSkewY' > setSkewY< / a > (< a href = 'undocumented#SkScalar' > SkScalar< / a > v)
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< / pre >
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Sets vertical skew factor.
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### Parameters
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< table > < tr > < td > < a name = 'SkMatrix_setSkewY_v' > < code > < strong > v< / strong > < / code > < / a > < / td >
< td > vertical skew factor to store< / td >
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< / tr >
< / table >
### Example
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< div > < fiddle-embed name = "b418d15df9829aefcc6aca93a37428bb" > < / fiddle-embed > < / div >
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### See Also
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< a href = '#SkMatrix_set' > set< / a > < a href = '#SkMatrix_setSkew' > setSkew< / a > < a href = '#SkMatrix_setSkewX' > setSkewX< / a >
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2018-05-16 11:07:07 +00:00
< a name = 'SkMatrix_setSkewX' > < / a >
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---
2017-10-26 11:58:48 +00:00
2018-05-16 11:07:07 +00:00
< pre style = "padding: 1em 1em 1em 1em; width: 62.5em;background-color: #f0f0f0 " >
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void < a href = '#SkMatrix_setSkewX' > setSkewX< / a > (< a href = 'undocumented#SkScalar' > SkScalar< / a > v)
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< / pre >
2018-01-04 21:11:51 +00:00
Sets horizontal skew factor.
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### Parameters
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< table > < tr > < td > < a name = 'SkMatrix_setSkewX_v' > < code > < strong > v< / strong > < / code > < / a > < / td >
< td > horizontal skew factor to store< / td >
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< / tr >
< / table >
### Example
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< div > < fiddle-embed name = "c7177a6fbc1545be95a5ebca87e0cd0d" > < / fiddle-embed > < / div >
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### See Also
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< a href = '#SkMatrix_set' > set< / a > < a href = '#SkMatrix_setSkew' > setSkew< / a > < a href = '#SkMatrix_setSkewX' > setSkewX< / a >
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2018-05-16 11:07:07 +00:00
< a name = 'SkMatrix_setTranslateX' > < / a >
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---
2017-10-26 11:58:48 +00:00
2018-05-16 11:07:07 +00:00
< pre style = "padding: 1em 1em 1em 1em; width: 62.5em;background-color: #f0f0f0 " >
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void < a href = '#SkMatrix_setTranslateX' > setTranslateX< / a > (< a href = 'undocumented#SkScalar' > SkScalar< / a > v)
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< / pre >
Sets horizontal translation.
### Parameters
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< table > < tr > < td > < a name = 'SkMatrix_setTranslateX_v' > < code > < strong > v< / strong > < / code > < / a > < / td >
< td > horizontal translation to store< / td >
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< / tr >
< / table >
### Example
< div > < fiddle-embed name = "a18bc2e3607ac3a8e438bcb61fb13130" > < / fiddle-embed > < / div >
### See Also
2018-11-07 19:59:03 +00:00
< a href = '#SkMatrix_set' > set< / a > < a href = '#SkMatrix_setTranslate' > setTranslate< / a > < a href = '#SkMatrix_setTranslateY' > setTranslateY< / a >
2017-10-26 11:58:48 +00:00
2018-05-16 11:07:07 +00:00
< a name = 'SkMatrix_setTranslateY' > < / a >
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---
2017-10-26 11:58:48 +00:00
2018-05-16 11:07:07 +00:00
< pre style = "padding: 1em 1em 1em 1em; width: 62.5em;background-color: #f0f0f0 " >
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void < a href = '#SkMatrix_setTranslateY' > setTranslateY< / a > (< a href = 'undocumented#SkScalar' > SkScalar< / a > v)
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< / pre >
Sets vertical translation.
### Parameters
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< table > < tr > < td > < a name = 'SkMatrix_setTranslateY_v' > < code > < strong > v< / strong > < / code > < / a > < / td >
< td > vertical translation to store< / td >
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< / tr >
< / table >
### Example
< div > < fiddle-embed name = "34e3c70a72b836abf7f4858d35eecc98" > < / fiddle-embed > < / div >
### See Also
2018-11-07 19:59:03 +00:00
< a href = '#SkMatrix_set' > set< / a > < a href = '#SkMatrix_setTranslate' > setTranslate< / a > < a href = '#SkMatrix_setTranslateX' > setTranslateX< / a >
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2018-05-16 11:07:07 +00:00
< a name = 'SkMatrix_setPerspX' > < / a >
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---
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2018-05-16 11:07:07 +00:00
< pre style = "padding: 1em 1em 1em 1em; width: 62.5em;background-color: #f0f0f0 " >
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void < a href = '#SkMatrix_setPerspX' > setPerspX< / a > (< a href = 'undocumented#SkScalar' > SkScalar< / a > v)
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< / pre >
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Sets input x-axis perspective factor, which causes < a href = '#SkMatrix_mapXY' > mapXY< / a > () to vary input x-axis values
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inversely proportional to input y-axis values.
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### Parameters
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< table > < tr > < td > < a name = 'SkMatrix_setPerspX_v' > < code > < strong > v< / strong > < / code > < / a > < / td >
< td > perspective factor< / td >
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< / tr >
< / table >
### Example
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< div > < fiddle-embed name = "@Matrix_setPerspX" > < / fiddle-embed > < / div >
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### See Also
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< a href = '#SkMatrix_getPerspX' > getPerspX< / a > < a href = '#SkMatrix_set' > set< / a > < a href = '#SkMatrix_setAll' > setAll< / a > < a href = '#SkMatrix_set9' > set9< / a > < a href = '#SkMatrix_MakeAll' > MakeAll< / a >
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2018-05-16 11:07:07 +00:00
< a name = 'SkMatrix_setPerspY' > < / a >
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---
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2018-05-16 11:07:07 +00:00
< pre style = "padding: 1em 1em 1em 1em; width: 62.5em;background-color: #f0f0f0 " >
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void < a href = '#SkMatrix_setPerspY' > setPerspY< / a > (< a href = 'undocumented#SkScalar' > SkScalar< / a > v)
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< / pre >
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Sets input y-axis perspective factor, which causes < a href = '#SkMatrix_mapXY' > mapXY< / a > () to vary input y-axis values
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inversely proportional to input x-axis values.
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### Parameters
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< table > < tr > < td > < a name = 'SkMatrix_setPerspY_v' > < code > < strong > v< / strong > < / code > < / a > < / td >
< td > perspective factor< / td >
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< / tr >
< / table >
### Example
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< div > < fiddle-embed name = "@Matrix_setPerspY" > < / fiddle-embed > < / div >
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### See Also
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< a href = '#SkMatrix_getPerspY' > getPerspY< / a > < a href = '#SkMatrix_set' > set< / a > < a href = '#SkMatrix_setAll' > setAll< / a > < a href = '#SkMatrix_set9' > set9< / a > < a href = '#SkMatrix_MakeAll' > MakeAll< / a >
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2018-05-16 11:07:07 +00:00
< a name = 'SkMatrix_setAll' > < / a >
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---
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2018-05-16 11:07:07 +00:00
< pre style = "padding: 1em 1em 1em 1em; width: 62.5em;background-color: #f0f0f0 " >
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void < a href = '#SkMatrix_setAll' > setAll< / a > (< a href = 'undocumented#SkScalar' > SkScalar< / a > scaleX, < a href = 'undocumented#SkScalar' > SkScalar< / a > skewX, < a href = 'undocumented#SkScalar' > SkScalar< / a > transX, < a href = 'undocumented#SkScalar' > SkScalar< / a > skewY, < a href = 'undocumented#SkScalar' > SkScalar< / a > scaleY,
< a href = 'undocumented#SkScalar' > SkScalar< / a > transY, < a href = 'undocumented#SkScalar' > SkScalar< / a > persp0, < a href = 'undocumented#SkScalar' > SkScalar< / a > persp1, < a href = 'undocumented#SkScalar' > SkScalar< / a > persp2)
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< / pre >
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Sets all values from parameters. Sets < a href = 'SkMatrix_Reference#Matrix' > matrix< / a > to:
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2018-10-31 16:14:03 +00:00
| < a href = '#SkMatrix_setAll_scaleX' > scaleX< / a > < a href = '#SkMatrix_setAll_skewX' > skewX< / a > < a href = '#SkMatrix_setAll_transX' > transX< / a > |
| < a href = '#SkMatrix_setAll_skewY' > skewY< / a > < a href = '#SkMatrix_setAll_scaleY' > scaleY< / a > < a href = '#SkMatrix_setAll_transY' > transY< / a > |
| < a href = '#SkMatrix_setAll_persp0' > persp0< / a > < a href = '#SkMatrix_setAll_persp1' > persp1< / a > < a href = '#SkMatrix_setAll_persp2' > persp2< / a > |
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### Parameters
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< table > < tr > < td > < a name = 'SkMatrix_setAll_scaleX' > < code > < strong > scaleX< / strong > < / code > < / a > < / td >
< td > horizontal scale factor to store< / td >
< / tr >
< tr > < td > < a name = 'SkMatrix_setAll_skewX' > < code > < strong > skewX< / strong > < / code > < / a > < / td >
< td > horizontal skew factor to store< / td >
< / tr >
< tr > < td > < a name = 'SkMatrix_setAll_transX' > < code > < strong > transX< / strong > < / code > < / a > < / td >
< td > horizontal translation to store< / td >
< / tr >
< tr > < td > < a name = 'SkMatrix_setAll_skewY' > < code > < strong > skewY< / strong > < / code > < / a > < / td >
< td > vertical skew factor to store< / td >
< / tr >
< tr > < td > < a name = 'SkMatrix_setAll_scaleY' > < code > < strong > scaleY< / strong > < / code > < / a > < / td >
< td > vertical scale factor to store< / td >
< / tr >
< tr > < td > < a name = 'SkMatrix_setAll_transY' > < code > < strong > transY< / strong > < / code > < / a > < / td >
< td > vertical translation to store< / td >
< / tr >
< tr > < td > < a name = 'SkMatrix_setAll_persp0' > < code > < strong > persp0< / strong > < / code > < / a > < / td >
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< td > input x-axis values perspective factor to store< / td >
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< / tr >
< tr > < td > < a name = 'SkMatrix_setAll_persp1' > < code > < strong > persp1< / strong > < / code > < / a > < / td >
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< td > input y-axis values perspective factor to store< / td >
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< / tr >
< tr > < td > < a name = 'SkMatrix_setAll_persp2' > < code > < strong > persp2< / strong > < / code > < / a > < / td >
< td > perspective scale factor to store< / td >
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< / tr >
< / table >
### Example
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< div > < fiddle-embed name = "95ccfc2a89ce593e6b7a9f992a844bc0" > < / fiddle-embed > < / div >
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### See Also
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< a href = '#SkMatrix_set9' > set9< / a > < a href = '#SkMatrix_MakeAll' > MakeAll< / a >
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2018-05-16 11:07:07 +00:00
< a name = 'SkMatrix_get9' > < / a >
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---
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2018-05-16 11:07:07 +00:00
< pre style = "padding: 1em 1em 1em 1em; width: 62.5em;background-color: #f0f0f0 " >
2018-11-29 17:05:25 +00:00
void < a href = '#SkMatrix_get9' > get9< / a > (< a href = 'undocumented#SkScalar' > SkScalar< / a > buffer[9])const
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< / pre >
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Copies nine < a href = 'undocumented#Scalar' > scalar< / a > values contained by < a href = 'SkMatrix_Reference#SkMatrix' > SkMatrix< / a > into < a href = '#SkMatrix_get9_buffer' > buffer< / a > , in member value
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ascending order: < a href = '#SkMatrix_kMScaleX' > kMScaleX< / a > , < a href = '#SkMatrix_kMSkewX' > kMSkewX< / a > , < a href = '#SkMatrix_kMTransX' > kMTransX< / a > , < a href = '#SkMatrix_kMSkewY' > kMSkewY< / a > , < a href = '#SkMatrix_kMScaleY' > kMScaleY< / a > , < a href = '#SkMatrix_kMTransY' > kMTransY< / a > ,
< a href = '#SkMatrix_kMPersp0' > kMPersp0< / a > , < a href = '#SkMatrix_kMPersp1' > kMPersp1< / a > , < a href = '#SkMatrix_kMPersp2' > kMPersp2< / a > .
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### Parameters
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< table > < tr > < td > < a name = 'SkMatrix_get9_buffer' > < code > < strong > buffer< / strong > < / code > < / a > < / td >
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< td > storage for nine < a href = 'undocumented#Scalar' > scalar< / a > values< / td >
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< / tr >
< / table >
### Example
2019-10-11 15:46:30 +00:00
< div > < fiddle-embed name = "@Matrix_get9" >
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#### Example Output
~~~~
{4, 0, 3},
{0, 5, 4},
{0, 0, 1}
~~~~
< / fiddle-embed > < / div >
### See Also
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< a href = '#SkMatrix_set9' > set9< / a >
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2018-05-16 11:07:07 +00:00
< a name = 'SkMatrix_set9' > < / a >
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---
2017-10-26 11:58:48 +00:00
2018-05-16 11:07:07 +00:00
< pre style = "padding: 1em 1em 1em 1em; width: 62.5em;background-color: #f0f0f0 " >
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void < a href = '#SkMatrix_set9' > set9< / a > (const < a href = 'undocumented#SkScalar' > SkScalar< / a > buffer[9])
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< / pre >
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Sets < a href = 'SkMatrix_Reference#SkMatrix' > SkMatrix< / a > to nine < a href = 'undocumented#Scalar' > scalar< / a > values in < a href = '#SkMatrix_set9_buffer' > buffer< / a > , in member value ascending order:
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< a href = '#SkMatrix_kMScaleX' > kMScaleX< / a > , < a href = '#SkMatrix_kMSkewX' > kMSkewX< / a > , < a href = '#SkMatrix_kMTransX' > kMTransX< / a > , < a href = '#SkMatrix_kMSkewY' > kMSkewY< / a > , < a href = '#SkMatrix_kMScaleY' > kMScaleY< / a > , < a href = '#SkMatrix_kMTransY' > kMTransY< / a > , < a href = '#SkMatrix_kMPersp0' > kMPersp0< / a > , < a href = '#SkMatrix_kMPersp1' > kMPersp1< / a > ,
< a href = '#SkMatrix_kMPersp2' > kMPersp2< / a > .
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2018-11-09 21:04:58 +00:00
Sets < a href = 'SkMatrix_Reference#Matrix' > matrix< / a > to:
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2018-10-31 16:14:03 +00:00
| < a href = '#SkMatrix_set9_buffer' > buffer< / a > [0] < a href = '#SkMatrix_set9_buffer' > buffer< / a > [1] < a href = '#SkMatrix_set9_buffer' > buffer< / a > [2] |
| < a href = '#SkMatrix_set9_buffer' > buffer< / a > [3] < a href = '#SkMatrix_set9_buffer' > buffer< / a > [4] < a href = '#SkMatrix_set9_buffer' > buffer< / a > [5] |
| < a href = '#SkMatrix_set9_buffer' > buffer< / a > [6] < a href = '#SkMatrix_set9_buffer' > buffer< / a > [7] < a href = '#SkMatrix_set9_buffer' > buffer< / a > [8] |
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2018-11-09 21:04:58 +00:00
In the future, < a href = '#SkMatrix_set9' > set9< / a > followed by < a href = '#SkMatrix_get9' > get9< / a > may not return the same values. Since < a href = 'SkMatrix_Reference#SkMatrix' > SkMatrix< / a >
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maps non-homogeneous coordinates, scaling all nine values produces an equivalent
transformation, possibly improving precision.
### Parameters
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< table > < tr > < td > < a name = 'SkMatrix_set9_buffer' > < code > < strong > buffer< / strong > < / code > < / a > < / td >
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< td > nine < a href = 'undocumented#Scalar' > scalar< / a > values< / td >
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< / tr >
< / table >
### Example
2019-10-11 15:46:30 +00:00
< div > < fiddle-embed name = "@Matrix_set9" > < / fiddle-embed > < / div >
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### See Also
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< a href = '#SkMatrix_setAll' > setAll< / a > < a href = '#SkMatrix_get9' > get9< / a > < a href = '#SkMatrix_MakeAll' > MakeAll< / a >
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< a name = 'SkMatrix_reset' > < / a >
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---
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< pre style = "padding: 1em 1em 1em 1em; width: 62.5em;background-color: #f0f0f0 " >
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void < a href = '#SkMatrix_reset' > reset()< / a >
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< / pre >
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Sets < a href = 'SkMatrix_Reference#SkMatrix' > SkMatrix< / a > to identity; which has no effect on mapped < a href = 'SkPoint_Reference#SkPoint' > SkPoint< / a > . Sets < a href = 'SkMatrix_Reference#SkMatrix' > SkMatrix< / a > to:
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| 1 0 0 |
| 0 1 0 |
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| 0 0 1 |
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Also called < a href = '#SkMatrix_setIdentity' > setIdentity< / a > (); use the one that provides better inline
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documentation.
### Example
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< div > < fiddle-embed name = "@Matrix_reset" >
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#### Example Output
~~~~
m.isIdentity(): true
~~~~
< / fiddle-embed > < / div >
### See Also
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< a href = '#SkMatrix_isIdentity' > isIdentity< / a > < a href = '#SkMatrix_setIdentity' > setIdentity< / a >
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< a name = 'SkMatrix_setIdentity' > < / a >
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---
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< pre style = "padding: 1em 1em 1em 1em; width: 62.5em;background-color: #f0f0f0 " >
void < a href = '#SkMatrix_setIdentity' > setIdentity< / a > ()
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< / pre >
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Sets < a href = 'SkMatrix_Reference#SkMatrix' > SkMatrix< / a > to identity; which has no effect on mapped < a href = 'SkPoint_Reference#SkPoint' > SkPoint< / a > . Sets < a href = 'SkMatrix_Reference#SkMatrix' > SkMatrix< / a > to:
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| 1 0 0 |
| 0 1 0 |
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| 0 0 1 |
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Also called < a href = '#SkMatrix_reset' > reset()< / a > ; use the one that provides better inline
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documentation.
### Example
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< div > < fiddle-embed name = "@Matrix_setIdentity" >
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#### Example Output
~~~~
m.isIdentity(): true
~~~~
< / fiddle-embed > < / div >
### See Also
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< a href = '#SkMatrix_isIdentity' > isIdentity< / a > < a href = '#SkMatrix_reset' > reset< / a >
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2018-05-16 11:07:07 +00:00
< a name = 'SkMatrix_setTranslate' > < / a >
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---
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< pre style = "padding: 1em 1em 1em 1em; width: 62.5em;background-color: #f0f0f0 " >
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void < a href = '#SkMatrix_setTranslate' > setTranslate< / a > (< a href = 'undocumented#SkScalar' > SkScalar< / a > dx, < a href = 'undocumented#SkScalar' > SkScalar< / a > dy)
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< / pre >
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Sets < a href = 'SkMatrix_Reference#SkMatrix' > SkMatrix< / a > to translate by (< a href = '#SkMatrix_setTranslate_dx' > dx< / a > , < a href = '#SkMatrix_setTranslate_dy' > dy< / a > ).
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### Parameters
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< table > < tr > < td > < a name = 'SkMatrix_setTranslate_dx' > < code > < strong > dx< / strong > < / code > < / a > < / td >
< td > horizontal translation< / td >
< / tr >
< tr > < td > < a name = 'SkMatrix_setTranslate_dy' > < code > < strong > dy< / strong > < / code > < / a > < / td >
< td > vertical translation< / td >
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< / tr >
< / table >
### Example
< div > < fiddle-embed name = "63ca62985741b1bccb5e8b9cf734874e" > < / fiddle-embed > < / div >
### See Also
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< a href = '#SkMatrix_setTranslateX' > setTranslateX< / a > < a href = '#SkMatrix_setTranslateY' > setTranslateY< / a >
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< a name = 'SkMatrix_setTranslate_2' > < / a >
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---
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< pre style = "padding: 1em 1em 1em 1em; width: 62.5em;background-color: #f0f0f0 " >
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void < a href = '#SkMatrix_setTranslate' > setTranslate< / a > (const < a href = 'SkPoint_Reference#SkVector' > SkVector< / a > & v)
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< / pre >
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Sets < a href = 'SkMatrix_Reference#SkMatrix' > SkMatrix< / a > to translate by (< a href = '#SkMatrix_setTranslate_2_v' > v< / a > .< a href = '#SkPoint_fX' > fX< / a > , < a href = '#SkMatrix_setTranslate_2_v' > v< / a > .< a href = '#SkPoint_fY' > fY< / a > ).
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### Parameters
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< table > < tr > < td > < a name = 'SkMatrix_setTranslate_2_v' > < code > < strong > v< / strong > < / code > < / a > < / td >
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< td > < a href = 'SkPoint_Reference#Vector' > vector< / a > containing horizontal and vertical translation< / td >
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< / tr >
< / table >
### Example
< div > < fiddle-embed name = "ccfc734aff2ddea0b097c83f5621de5e" > < / fiddle-embed > < / div >
### See Also
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< a href = '#SkMatrix_setTranslateX' > setTranslateX< / a > < a href = '#SkMatrix_setTranslateY' > setTranslateY< / a > < a href = '#SkMatrix_MakeTrans' > MakeTrans< / a >
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< a name = 'SkMatrix_setScale' > < / a >
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---
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2018-05-16 11:07:07 +00:00
< pre style = "padding: 1em 1em 1em 1em; width: 62.5em;background-color: #f0f0f0 " >
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void < a href = '#SkMatrix_setScale' > setScale< / a > (< a href = 'undocumented#SkScalar' > SkScalar< / a > sx, < a href = 'undocumented#SkScalar' > SkScalar< / a > sy, < a href = 'undocumented#SkScalar' > SkScalar< / a > px, < a href = 'undocumented#SkScalar' > SkScalar< / a > py)
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< / pre >
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Sets < a href = 'SkMatrix_Reference#SkMatrix' > SkMatrix< / a > to scale by < a href = '#SkMatrix_setScale_sx' > sx< / a > and < a href = '#SkMatrix_setScale_sy' > sy< / a > , about a pivot < a href = 'SkPoint_Reference#Point' > point< / a > at (< a href = '#SkMatrix_setScale_px' > px< / a > , < a href = '#SkMatrix_setScale_py' > py< / a > ).
The pivot < a href = 'SkPoint_Reference#Point' > point< / a > is unchanged when mapped with < a href = 'SkMatrix_Reference#SkMatrix' > SkMatrix< / a > .
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### Parameters
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< table > < tr > < td > < a name = 'SkMatrix_setScale_sx' > < code > < strong > sx< / strong > < / code > < / a > < / td >
< td > horizontal scale factor< / td >
< / tr >
< tr > < td > < a name = 'SkMatrix_setScale_sy' > < code > < strong > sy< / strong > < / code > < / a > < / td >
< td > vertical scale factor< / td >
< / tr >
< tr > < td > < a name = 'SkMatrix_setScale_px' > < code > < strong > px< / strong > < / code > < / a > < / td >
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< td > pivot on x-axis< / td >
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< / tr >
< tr > < td > < a name = 'SkMatrix_setScale_py' > < code > < strong > py< / strong > < / code > < / a > < / td >
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< td > pivot on y-axis< / td >
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< / tr >
< / table >
### Example
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< div > < fiddle-embed name = "4565a0792058178c88e0a129a87272d6" > < / fiddle-embed > < / div >
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### See Also
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< a href = '#SkMatrix_setScaleX' > setScaleX< / a > < a href = '#SkMatrix_setScaleY' > setScaleY< / a > < a href = '#SkMatrix_MakeScale' > MakeScale< / a > < a href = '#SkMatrix_preScale' > preScale< / a > < a href = '#SkMatrix_postScale' > postScale< / a >
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2018-05-16 11:07:07 +00:00
< a name = 'SkMatrix_setScale_2' > < / a >
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2018-10-16 14:30:28 +00:00
---
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< pre style = "padding: 1em 1em 1em 1em; width: 62.5em;background-color: #f0f0f0 " >
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void < a href = '#SkMatrix_setScale' > setScale< / a > (< a href = 'undocumented#SkScalar' > SkScalar< / a > sx, < a href = 'undocumented#SkScalar' > SkScalar< / a > sy)
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< / pre >
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Sets < a href = 'SkMatrix_Reference#SkMatrix' > SkMatrix< / a > to scale by < a href = '#SkMatrix_setScale_2_sx' > sx< / a > and < a href = '#SkMatrix_setScale_2_sy' > sy< / a > about at pivot < a href = 'SkPoint_Reference#Point' > point< / a > at (0, 0).
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### Parameters
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< table > < tr > < td > < a name = 'SkMatrix_setScale_2_sx' > < code > < strong > sx< / strong > < / code > < / a > < / td >
< td > horizontal scale factor< / td >
< / tr >
< tr > < td > < a name = 'SkMatrix_setScale_2_sy' > < code > < strong > sy< / strong > < / code > < / a > < / td >
< td > vertical scale factor< / td >
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< / tr >
< / table >
### Example
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< div > < fiddle-embed name = "1579d0cc109c26e69f66f73abd35fb0e" > < / fiddle-embed > < / div >
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### See Also
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< a href = '#SkMatrix_setScaleX' > setScaleX< / a > < a href = '#SkMatrix_setScaleY' > setScaleY< / a > < a href = '#SkMatrix_MakeScale' > MakeScale< / a > < a href = '#SkMatrix_preScale' > preScale< / a > < a href = '#SkMatrix_postScale' > postScale< / a >
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< a name = 'SkMatrix_setRotate' > < / a >
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---
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< pre style = "padding: 1em 1em 1em 1em; width: 62.5em;background-color: #f0f0f0 " >
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void < a href = '#SkMatrix_setRotate' > setRotate< / a > (< a href = 'undocumented#SkScalar' > SkScalar< / a > degrees, < a href = 'undocumented#SkScalar' > SkScalar< / a > px, < a href = 'undocumented#SkScalar' > SkScalar< / a > py)
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< / pre >
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Sets < a href = 'SkMatrix_Reference#SkMatrix' > SkMatrix< / a > to rotate by < a href = '#SkMatrix_setRotate_degrees' > degrees< / a > about a pivot < a href = 'SkPoint_Reference#Point' > point< / a > at (< a href = '#SkMatrix_setRotate_px' > px< / a > , < a href = '#SkMatrix_setRotate_py' > py< / a > ).
The pivot < a href = 'SkPoint_Reference#Point' > point< / a > is unchanged when mapped with < a href = 'SkMatrix_Reference#SkMatrix' > SkMatrix< / a > .
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Positive < a href = '#SkMatrix_setRotate_degrees' > degrees< / a > rotates clockwise.
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### Parameters
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< table > < tr > < td > < a name = 'SkMatrix_setRotate_degrees' > < code > < strong > degrees< / strong > < / code > < / a > < / td >
< td > angle of axes relative to upright axes< / td >
< / tr >
< tr > < td > < a name = 'SkMatrix_setRotate_px' > < code > < strong > px< / strong > < / code > < / a > < / td >
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< td > pivot on x-axis< / td >
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< / tr >
< tr > < td > < a name = 'SkMatrix_setRotate_py' > < code > < strong > py< / strong > < / code > < / a > < / td >
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< td > pivot on y-axis< / td >
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< / tr >
< / table >
### Example
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< div > < fiddle-embed name = "@Matrix_setRotate" > < / fiddle-embed > < / div >
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### See Also
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< a href = '#SkMatrix_setSinCos' > setSinCos< / a > < a href = '#SkMatrix_preRotate' > preRotate< / a > < a href = '#SkMatrix_postRotate' > postRotate< / a >
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2018-05-16 11:07:07 +00:00
< a name = 'SkMatrix_setRotate_2' > < / a >
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2018-10-16 14:30:28 +00:00
---
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< pre style = "padding: 1em 1em 1em 1em; width: 62.5em;background-color: #f0f0f0 " >
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void < a href = '#SkMatrix_setRotate' > setRotate< / a > (< a href = 'undocumented#SkScalar' > SkScalar< / a > degrees)
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< / pre >
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Sets < a href = 'SkMatrix_Reference#SkMatrix' > SkMatrix< / a > to rotate by < a href = '#SkMatrix_setRotate_2_degrees' > degrees< / a > about a pivot < a href = 'SkPoint_Reference#Point' > point< / a > at (0, 0).
Positive < a href = '#SkMatrix_setRotate_2_degrees' > degrees< / a > rotates clockwise.
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### Parameters
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< table > < tr > < td > < a name = 'SkMatrix_setRotate_2_degrees' > < code > < strong > degrees< / strong > < / code > < / a > < / td >
< td > angle of axes relative to upright axes< / td >
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< / tr >
< / table >
### Example
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< div > < fiddle-embed name = "@Matrix_setRotate_2" > < / fiddle-embed > < / div >
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### See Also
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< a href = '#SkMatrix_setSinCos' > setSinCos< / a > < a href = '#SkMatrix_preRotate' > preRotate< / a > < a href = '#SkMatrix_postRotate' > postRotate< / a >
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2018-05-16 11:07:07 +00:00
< a name = 'SkMatrix_setSinCos' > < / a >
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---
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2018-05-16 11:07:07 +00:00
< pre style = "padding: 1em 1em 1em 1em; width: 62.5em;background-color: #f0f0f0 " >
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void < a href = '#SkMatrix_setSinCos' > setSinCos< / a > (< a href = 'undocumented#SkScalar' > SkScalar< / a > sinValue, < a href = 'undocumented#SkScalar' > SkScalar< / a > cosValue, < a href = 'undocumented#SkScalar' > SkScalar< / a > px, < a href = 'undocumented#SkScalar' > SkScalar< / a > py)
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< / pre >
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Sets < a href = 'SkMatrix_Reference#SkMatrix' > SkMatrix< / a > to rotate by < a href = '#SkMatrix_setSinCos_sinValue' > sinValue< / a > and < a href = '#SkMatrix_setSinCos_cosValue' > cosValue< / a > , about a pivot < a href = 'SkPoint_Reference#Point' > point< / a > at (< a href = '#SkMatrix_setSinCos_px' > px< / a > , < a href = '#SkMatrix_setSinCos_py' > py< / a > ).
The pivot < a href = 'SkPoint_Reference#Point' > point< / a > is unchanged when mapped with < a href = 'SkMatrix_Reference#SkMatrix' > SkMatrix< / a > .
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< a href = 'SkPoint_Reference#Vector' > Vector< / a > (< a href = '#SkMatrix_setSinCos_sinValue' > sinValue< / a > , < a href = '#SkMatrix_setSinCos_cosValue' > cosValue< / a > ) describes the angle of rotation relative to (0, 1).
< a href = 'SkPoint_Reference#Vector' > Vector< / a > length specifies scale.
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### Parameters
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< table > < tr > < td > < a name = 'SkMatrix_setSinCos_sinValue' > < code > < strong > sinValue< / strong > < / code > < / a > < / td >
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< td > rotation < a href = 'SkPoint_Reference#Vector' > vector< / a > x-axis component< / td >
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< / tr >
< tr > < td > < a name = 'SkMatrix_setSinCos_cosValue' > < code > < strong > cosValue< / strong > < / code > < / a > < / td >
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< td > rotation < a href = 'SkPoint_Reference#Vector' > vector< / a > y-axis component< / td >
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< / tr >
< tr > < td > < a name = 'SkMatrix_setSinCos_px' > < code > < strong > px< / strong > < / code > < / a > < / td >
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< td > pivot on x-axis< / td >
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< / tr >
< tr > < td > < a name = 'SkMatrix_setSinCos_py' > < code > < strong > py< / strong > < / code > < / a > < / td >
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< td > pivot on y-axis< / td >
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< / tr >
< / table >
### Example
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< div > < fiddle-embed name = "@Matrix_setSinCos" > < / fiddle-embed > < / div >
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### See Also
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< a href = '#SkMatrix_setRotate' > setRotate< / a > < a href = '#SkMatrix_setScale' > setScale< / a > < a href = '#SkMatrix_setRSXform' > setRSXform< / a >
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2018-05-16 11:07:07 +00:00
< a name = 'SkMatrix_setSinCos_2' > < / a >
2018-01-26 17:56:22 +00:00
2018-10-16 14:30:28 +00:00
---
2018-05-16 11:07:07 +00:00
< pre style = "padding: 1em 1em 1em 1em; width: 62.5em;background-color: #f0f0f0 " >
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void < a href = '#SkMatrix_setSinCos' > setSinCos< / a > (< a href = 'undocumented#SkScalar' > SkScalar< / a > sinValue, < a href = 'undocumented#SkScalar' > SkScalar< / a > cosValue)
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< / pre >
2018-11-09 21:04:58 +00:00
Sets < a href = 'SkMatrix_Reference#SkMatrix' > SkMatrix< / a > to rotate by < a href = '#SkMatrix_setSinCos_2_sinValue' > sinValue< / a > and < a href = '#SkMatrix_setSinCos_2_cosValue' > cosValue< / a > , about a pivot < a href = 'SkPoint_Reference#Point' > point< / a > at (0, 0).
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2018-11-09 21:04:58 +00:00
< a href = 'SkPoint_Reference#Vector' > Vector< / a > (< a href = '#SkMatrix_setSinCos_2_sinValue' > sinValue< / a > , < a href = '#SkMatrix_setSinCos_2_cosValue' > cosValue< / a > ) describes the angle of rotation relative to (0, 1).
< a href = 'SkPoint_Reference#Vector' > Vector< / a > length specifies scale.
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### Parameters
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< table > < tr > < td > < a name = 'SkMatrix_setSinCos_2_sinValue' > < code > < strong > sinValue< / strong > < / code > < / a > < / td >
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< td > rotation < a href = 'SkPoint_Reference#Vector' > vector< / a > x-axis component< / td >
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< / tr >
< tr > < td > < a name = 'SkMatrix_setSinCos_2_cosValue' > < code > < strong > cosValue< / strong > < / code > < / a > < / td >
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< td > rotation < a href = 'SkPoint_Reference#Vector' > vector< / a > y-axis component< / td >
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< / tr >
< / table >
### Example
2019-10-11 15:46:30 +00:00
< div > < fiddle-embed name = "@Matrix_setSinCos_2" > < div > < a href = 'SkCanvas_Reference#Canvas' > Canvas< / a > needs offset after applying < a href = 'SkMatrix_Reference#Matrix' > Matrix< / a > to pivot about < a href = 'SkRect_Reference#Rect' > Rect< / a > center.
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< / div > < / fiddle-embed > < / div >
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### See Also
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< a href = '#SkMatrix_setRotate' > setRotate< / a > < a href = '#SkMatrix_setScale' > setScale< / a > < a href = '#SkMatrix_setRSXform' > setRSXform< / a >
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< a name = 'SkMatrix_setRSXform' > < / a >
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---
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< pre style = "padding: 1em 1em 1em 1em; width: 62.5em;background-color: #f0f0f0 " >
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< a href = 'SkMatrix_Reference#SkMatrix' > SkMatrix< / a > & < a href = '#SkMatrix_setRSXform' > setRSXform< / a > (const < a href = 'undocumented#SkRSXform' > SkRSXform< / a > & rsxForm)
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< / pre >
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Sets < a href = 'SkMatrix_Reference#SkMatrix' > SkMatrix< / a > to rotate, scale, and translate using a compressed < a href = 'SkMatrix_Reference#Matrix' > matrix< / a > form.
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< a href = 'SkPoint_Reference#Vector' > Vector< / a > (< a href = '#SkMatrix_setRSXform_rsxForm' > rsxForm< / a > .< a href = '#SkRSXform_fSSin' > fSSin< / a > , < a href = '#SkMatrix_setRSXform_rsxForm' > rsxForm< / a > .< a href = '#SkRSXform_fSCos' > fSCos< / a > ) describes the angle of rotation relative
to (0, 1). < a href = 'SkPoint_Reference#Vector' > Vector< / a > length specifies scale. Mapped < a href = 'SkPoint_Reference#Point' > point< / a > is rotated and scaled
by < a href = 'SkPoint_Reference#Vector' > vector< / a > , then translated by (< a href = '#SkMatrix_setRSXform_rsxForm' > rsxForm< / a > .< a href = '#SkRSXform_fTx' > fTx< / a > , < a href = '#SkMatrix_setRSXform_rsxForm' > rsxForm< / a > .< a href = '#SkRSXform_fTy' > fTy< / a > ).
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### Parameters
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< table > < tr > < td > < a name = 'SkMatrix_setRSXform_rsxForm' > < code > < strong > rsxForm< / strong > < / code > < / a > < / td >
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< td > compressed < a href = 'undocumented#SkRSXform' > SkRSXform< / a > < a href = 'SkMatrix_Reference#Matrix' > matrix< / a > < / td >
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< / tr >
< / table >
### Return Value
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reference to < a href = 'SkMatrix_Reference#SkMatrix' > SkMatrix< / a >
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### Example
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< div > < fiddle-embed name = "@Matrix_setRSXform" > < div > < a href = 'SkCanvas_Reference#Canvas' > Canvas< / a > needs offset after applying < a href = 'SkMatrix_Reference#Matrix' > Matrix< / a > to pivot about < a href = 'SkRect_Reference#Rect' > Rect< / a > center.
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< / div > < / fiddle-embed > < / div >
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### See Also
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< a href = '#SkMatrix_setSinCos' > setSinCos< / a > < a href = '#SkMatrix_setScale' > setScale< / a > < a href = '#SkMatrix_setTranslate' > setTranslate< / a >
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< a name = 'SkMatrix_setSkew' > < / a >
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---
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< pre style = "padding: 1em 1em 1em 1em; width: 62.5em;background-color: #f0f0f0 " >
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void < a href = '#SkMatrix_setSkew' > setSkew< / a > (< a href = 'undocumented#SkScalar' > SkScalar< / a > kx, < a href = 'undocumented#SkScalar' > SkScalar< / a > ky, < a href = 'undocumented#SkScalar' > SkScalar< / a > px, < a href = 'undocumented#SkScalar' > SkScalar< / a > py)
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< / pre >
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Sets < a href = 'SkMatrix_Reference#SkMatrix' > SkMatrix< / a > to skew by < a href = '#SkMatrix_setSkew_kx' > kx< / a > and < a href = '#SkMatrix_setSkew_ky' > ky< / a > , about a pivot < a href = 'SkPoint_Reference#Point' > point< / a > at (< a href = '#SkMatrix_setSkew_px' > px< / a > , < a href = '#SkMatrix_setSkew_py' > py< / a > ).
The pivot < a href = 'SkPoint_Reference#Point' > point< / a > is unchanged when mapped with < a href = 'SkMatrix_Reference#SkMatrix' > SkMatrix< / a > .
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### Parameters
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< table > < tr > < td > < a name = 'SkMatrix_setSkew_kx' > < code > < strong > kx< / strong > < / code > < / a > < / td >
< td > horizontal skew factor< / td >
< / tr >
< tr > < td > < a name = 'SkMatrix_setSkew_ky' > < code > < strong > ky< / strong > < / code > < / a > < / td >
< td > vertical skew factor< / td >
< / tr >
< tr > < td > < a name = 'SkMatrix_setSkew_px' > < code > < strong > px< / strong > < / code > < / a > < / td >
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< td > pivot on x-axis< / td >
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< / tr >
< tr > < td > < a name = 'SkMatrix_setSkew_py' > < code > < strong > py< / strong > < / code > < / a > < / td >
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< td > pivot on y-axis< / td >
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< / tr >
< / table >
### Example
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< div > < fiddle-embed name = "55e0431adc6c5b1987ebb8123cc10342" > < / fiddle-embed > < / div >
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### See Also
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< a href = '#SkMatrix_setSkewX' > setSkewX< / a > < a href = '#SkMatrix_setSkewY' > setSkewY< / a > < a href = '#SkMatrix_preSkew' > preSkew< / a > < a href = '#SkMatrix_postSkew' > postSkew< / a >
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< a name = 'SkMatrix_setSkew_2' > < / a >
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---
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< pre style = "padding: 1em 1em 1em 1em; width: 62.5em;background-color: #f0f0f0 " >
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void < a href = '#SkMatrix_setSkew' > setSkew< / a > (< a href = 'undocumented#SkScalar' > SkScalar< / a > kx, < a href = 'undocumented#SkScalar' > SkScalar< / a > ky)
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< / pre >
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Sets < a href = 'SkMatrix_Reference#SkMatrix' > SkMatrix< / a > to skew by < a href = '#SkMatrix_setSkew_2_kx' > kx< / a > and < a href = '#SkMatrix_setSkew_2_ky' > ky< / a > , about a pivot < a href = 'SkPoint_Reference#Point' > point< / a > at (0, 0).
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### Parameters
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< table > < tr > < td > < a name = 'SkMatrix_setSkew_2_kx' > < code > < strong > kx< / strong > < / code > < / a > < / td >
< td > horizontal skew factor< / td >
< / tr >
< tr > < td > < a name = 'SkMatrix_setSkew_2_ky' > < code > < strong > ky< / strong > < / code > < / a > < / td >
< td > vertical skew factor< / td >
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< / tr >
< / table >
### Example
< div > < fiddle-embed name = "05be7844e9afdd7b9bfc31c5423a70a2" > < / fiddle-embed > < / div >
### See Also
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< a href = '#SkMatrix_setSkewX' > setSkewX< / a > < a href = '#SkMatrix_setSkewY' > setSkewY< / a > < a href = '#SkMatrix_preSkew' > preSkew< / a > < a href = '#SkMatrix_postSkew' > postSkew< / a >
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< a name = 'SkMatrix_setConcat' > < / a >
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---
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< pre style = "padding: 1em 1em 1em 1em; width: 62.5em;background-color: #f0f0f0 " >
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void < a href = '#SkMatrix_setConcat' > setConcat< / a > (const < a href = 'SkMatrix_Reference#SkMatrix' > SkMatrix< / a > & a, const < a href = 'SkMatrix_Reference#SkMatrix' > SkMatrix< / a > & b)
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< / pre >
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Sets < a href = 'SkMatrix_Reference#SkMatrix' > SkMatrix< / a > to < a href = 'SkMatrix_Reference#SkMatrix' > SkMatrix< / a > < a href = '#SkMatrix_setConcat_a' > a< / a > multiplied by < a href = 'SkMatrix_Reference#SkMatrix' > SkMatrix< / a > < a href = '#SkMatrix_setConcat_b' > b< / a > . Either < a href = '#SkMatrix_setConcat_a' > a< / a > or < a href = '#SkMatrix_setConcat_b' > b< / a > may be this.
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Given:
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| A B C | | J K L |
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< a href = '#SkMatrix_setConcat_a' > a< / a > = | D E F |, < a href = '#SkMatrix_setConcat_b' > b< / a > = | M N O |
| G H < a href = '#SkMatrix_I' > I< / a > | | P Q R |
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sets < a href = 'SkMatrix_Reference#SkMatrix' > SkMatrix< / a > to:
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| A B C | | J K L | | AJ+BM+CP AK+BN+CQ AL+BO+CR |
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< a href = '#SkMatrix_setConcat_a' > a</ a > * <a href='#SkMatrix_setConcat_b'>b</a> = | D E F | * | M N O | = | DJ+EM+FP DK+EN+FQ DL+EO+FR |
| G H < a href = '#SkMatrix_I' > I< / a > | | P Q R | | GJ+HM+IP GK+HN+IQ GL+HO+IR |
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### Parameters
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< table > < tr > < td > < a name = 'SkMatrix_setConcat_a' > < code > < strong > a< / strong > < / code > < / a > < / td >
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< td > < a href = 'SkMatrix_Reference#SkMatrix' > SkMatrix< / a > on left side of multiply expression< / td >
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< / tr >
< tr > < td > < a name = 'SkMatrix_setConcat_b' > < code > < strong > b< / strong > < / code > < / a > < / td >
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< td > < a href = 'SkMatrix_Reference#SkMatrix' > SkMatrix< / a > on right side of multiply expression< / td >
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< / tr >
< / table >
### Example
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< div > < fiddle-embed name = "@Matrix_setConcat" > < div > < a href = '#SkMatrix_setPolyToPoly' > setPolyToPoly< / a > creates perspective < a href = 'SkMatrix_Reference#Matrix' > matrices< / a > , one the inverse of the other.
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Multiplying the < a href = 'SkMatrix_Reference#Matrix' > matrix< / a > by its inverse turns into an identity < a href = 'SkMatrix_Reference#Matrix' > matrix< / a > .
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< / div > < / fiddle-embed > < / div >
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### See Also
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< a href = '#SkMatrix_Concat' > Concat< / a > < a href = '#SkMatrix_preConcat' > preConcat< / a > < a href = '#SkMatrix_postConcat' > postConcat< / a > < a href = 'SkCanvas_Reference#SkCanvas' > SkCanvas< / a > ::< a href = '#SkCanvas_concat' > concat< / a >
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< a name = 'SkMatrix_preTranslate' > < / a >
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---
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< pre style = "padding: 1em 1em 1em 1em; width: 62.5em;background-color: #f0f0f0 " >
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void < a href = '#SkMatrix_preTranslate' > preTranslate< / a > (< a href = 'undocumented#SkScalar' > SkScalar< / a > dx, < a href = 'undocumented#SkScalar' > SkScalar< / a > dy)
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< / pre >
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Sets < a href = 'SkMatrix_Reference#SkMatrix' > SkMatrix< / a > to < a href = 'SkMatrix_Reference#SkMatrix' > SkMatrix< / a > multiplied by < a href = 'SkMatrix_Reference#SkMatrix' > SkMatrix< / a > constructed from translation (< a href = '#SkMatrix_preTranslate_dx' > dx< / a > , < a href = '#SkMatrix_preTranslate_dy' > dy< / a > ).
This can be thought of as moving the < a href = 'SkPoint_Reference#Point' > point< / a > to be mapped before applying < a href = 'SkMatrix_Reference#SkMatrix' > SkMatrix< / a > .
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Given:
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| A B C | | 1 0 < a href = '#SkMatrix_preTranslate_dx' > dx< / a > |
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< a href = 'SkMatrix_Reference#Matrix' > Matrix< / a > = | D E F |, T(< a href = '#SkMatrix_preTranslate_dx' > dx< / a > , < a href = '#SkMatrix_preTranslate_dy' > dy< / a > ) = | 0 1 < a href = '#SkMatrix_preTranslate_dy' > dy< / a > |
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| G H < a href = '#SkMatrix_I' > I< / a > | | 0 0 1 |
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sets < a href = 'SkMatrix_Reference#SkMatrix' > SkMatrix< / a > to:
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| A B C | | 1 0 < a href = '#SkMatrix_preTranslate_dx' > dx< / a > | | A B A*< a href = '#SkMatrix_preTranslate_dx' > dx< / a > +B*< a href = '#SkMatrix_preTranslate_dy' > dy< / a > +C |
< a href = 'SkMatrix_Reference#Matrix' > Matrix</ a > * T(<a href='#SkMatrix_preTranslate_dx'>dx</a>, <a href='#SkMatrix_preTranslate_dy'>dy</a>) = | D E F | | 0 1 <a href='#SkMatrix_preTranslate_dy'>dy</a> | = | D E D* < a href = '#SkMatrix_preTranslate_dx' > dx</ a > +E*< a href = '#SkMatrix_preTranslate_dy' > dy</ a > +F |
| G H < a href = '#SkMatrix_I' > I< / a > | | 0 0 1 | | G H G*< a href = '#SkMatrix_preTranslate_dx' > dx< / a > +H*< a href = '#SkMatrix_preTranslate_dy' > dy< / a > +< a href = '#SkMatrix_I' > I< / a > |
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### Parameters
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< table > < tr > < td > < a name = 'SkMatrix_preTranslate_dx' > < code > < strong > dx< / strong > < / code > < / a > < / td >
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< td > x-axis translation before applying < a href = 'SkMatrix_Reference#SkMatrix' > SkMatrix< / a > < / td >
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< / tr >
< tr > < td > < a name = 'SkMatrix_preTranslate_dy' > < code > < strong > dy< / strong > < / code > < / a > < / td >
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< td > y-axis translation before applying < a href = 'SkMatrix_Reference#SkMatrix' > SkMatrix< / a > < / td >
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< / tr >
< / table >
### Example
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< div > < fiddle-embed name = "@Matrix_preTranslate" > < / fiddle-embed > < / div >
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### See Also
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< a href = '#SkMatrix_postTranslate' > postTranslate< / a > < a href = '#SkMatrix_setTranslate' > setTranslate< / a > < a href = '#SkMatrix_MakeTrans' > MakeTrans< / a >
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< a name = 'SkMatrix_preScale' > < / a >
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---
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< pre style = "padding: 1em 1em 1em 1em; width: 62.5em;background-color: #f0f0f0 " >
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void < a href = '#SkMatrix_preScale' > preScale< / a > (< a href = 'undocumented#SkScalar' > SkScalar< / a > sx, < a href = 'undocumented#SkScalar' > SkScalar< / a > sy, < a href = 'undocumented#SkScalar' > SkScalar< / a > px, < a href = 'undocumented#SkScalar' > SkScalar< / a > py)
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< / pre >
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Sets < a href = 'SkMatrix_Reference#SkMatrix' > SkMatrix< / a > to < a href = 'SkMatrix_Reference#SkMatrix' > SkMatrix< / a > multiplied by < a href = 'SkMatrix_Reference#SkMatrix' > SkMatrix< / a > constructed from scaling by (< a href = '#SkMatrix_preScale_sx' > sx< / a > , < a href = '#SkMatrix_preScale_sy' > sy< / a > )
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about pivot < a href = 'SkPoint_Reference#Point' > point< / a > (< a href = '#SkMatrix_preScale_px' > px< / a > , < a href = '#SkMatrix_preScale_py' > py< / a > ).
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This can be thought of as scaling about a pivot < a href = 'SkPoint_Reference#Point' > point< / a > before applying < a href = 'SkMatrix_Reference#SkMatrix' > SkMatrix< / a > .
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Given:
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| A B C | | < a href = '#SkMatrix_preScale_sx' > sx< / a > 0 dx |
< a href = 'SkMatrix_Reference#Matrix' > Matrix< / a > = | D E F |, S(< a href = '#SkMatrix_preScale_sx' > sx< / a > , < a href = '#SkMatrix_preScale_sy' > sy< / a > , < a href = '#SkMatrix_preScale_px' > px< / a > , < a href = '#SkMatrix_preScale_py' > py< / a > ) = | 0 < a href = '#SkMatrix_preScale_sy' > sy< / a > dy |
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| G H < a href = '#SkMatrix_I' > I< / a > | | 0 0 1 |
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where
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dx = < a href = '#SkMatrix_preScale_px' > px< / a > - < a href = '#SkMatrix_preScale_sx' > sx< / a > * < a href = '#SkMatrix_preScale_px' > px< / a >
dy = < a href = '#SkMatrix_preScale_py' > py< / a > - < a href = '#SkMatrix_preScale_sy' > sy< / a > * < a href = '#SkMatrix_preScale_py' > py< / a >
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sets < a href = 'SkMatrix_Reference#SkMatrix' > SkMatrix< / a > to:
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| A B C | | < a href = '#SkMatrix_preScale_sx' > sx< / a > 0 dx | | A*< a href = '#SkMatrix_preScale_sx' > sx< / a > B*< a href = '#SkMatrix_preScale_sy' > sy< / a > A*dx+B*dy+C |
< a href = 'SkMatrix_Reference#Matrix' > Matrix</ a > * S(<a href='#SkMatrix_preScale_sx'>sx</a>, <a href='#SkMatrix_preScale_sy'>sy</a>, <a href='#SkMatrix_preScale_px'>px</a>, <a href='#SkMatrix_preScale_py'>py</a>) = | D E F | | 0 <a href='#SkMatrix_preScale_sy'>sy</a> dy | = | D* < a href = '#SkMatrix_preScale_sx' > sx</ a > E*< a href = '#SkMatrix_preScale_sy' > sy</ a > D*dx+E*dy+F |
| G H < a href = '#SkMatrix_I' > I< / a > | | 0 0 1 | | G*< a href = '#SkMatrix_preScale_sx' > sx< / a > H*< a href = '#SkMatrix_preScale_sy' > sy< / a > G*dx+H*dy+< a href = '#SkMatrix_I' > I< / a > |
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### Parameters
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< table > < tr > < td > < a name = 'SkMatrix_preScale_sx' > < code > < strong > sx< / strong > < / code > < / a > < / td >
< td > horizontal scale factor< / td >
< / tr >
< tr > < td > < a name = 'SkMatrix_preScale_sy' > < code > < strong > sy< / strong > < / code > < / a > < / td >
< td > vertical scale factor< / td >
< / tr >
< tr > < td > < a name = 'SkMatrix_preScale_px' > < code > < strong > px< / strong > < / code > < / a > < / td >
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< td > pivot on x-axis< / td >
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< / tr >
< tr > < td > < a name = 'SkMatrix_preScale_py' > < code > < strong > py< / strong > < / code > < / a > < / td >
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< td > pivot on y-axis< / td >
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< / tr >
< / table >
### Example
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< div > < fiddle-embed name = "@Matrix_preScale" > < / fiddle-embed > < / div >
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### See Also
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< a href = '#SkMatrix_postScale' > postScale< / a > < a href = '#SkMatrix_setScale' > setScale< / a > < a href = '#SkMatrix_MakeScale' > MakeScale< / a >
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< a name = 'SkMatrix_preScale_2' > < / a >
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---
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< pre style = "padding: 1em 1em 1em 1em; width: 62.5em;background-color: #f0f0f0 " >
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void < a href = '#SkMatrix_preScale' > preScale< / a > (< a href = 'undocumented#SkScalar' > SkScalar< / a > sx, < a href = 'undocumented#SkScalar' > SkScalar< / a > sy)
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< / pre >
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Sets < a href = 'SkMatrix_Reference#SkMatrix' > SkMatrix< / a > to < a href = 'SkMatrix_Reference#SkMatrix' > SkMatrix< / a > multiplied by < a href = 'SkMatrix_Reference#SkMatrix' > SkMatrix< / a > constructed from scaling by (< a href = '#SkMatrix_preScale_2_sx' > sx< / a > , < a href = '#SkMatrix_preScale_2_sy' > sy< / a > )
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about pivot < a href = 'SkPoint_Reference#Point' > point< / a > (0, 0).
This can be thought of as scaling about the origin before applying < a href = 'SkMatrix_Reference#SkMatrix' > SkMatrix< / a > .
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Given:
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| A B C | | < a href = '#SkMatrix_preScale_2_sx' > sx< / a > 0 0 |
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< a href = 'SkMatrix_Reference#Matrix' > Matrix< / a > = | D E F |, S(< a href = '#SkMatrix_preScale_2_sx' > sx< / a > , < a href = '#SkMatrix_preScale_2_sy' > sy< / a > ) = | 0 < a href = '#SkMatrix_preScale_2_sy' > sy< / a > 0 |
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| G H < a href = '#SkMatrix_I' > I< / a > | | 0 0 1 |
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sets < a href = 'SkMatrix_Reference#SkMatrix' > SkMatrix< / a > to:
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| A B C | | < a href = '#SkMatrix_preScale_2_sx' > sx< / a > 0 0 | | A*< a href = '#SkMatrix_preScale_2_sx' > sx< / a > B*< a href = '#SkMatrix_preScale_2_sy' > sy< / a > C |
< a href = 'SkMatrix_Reference#Matrix' > Matrix</ a > * S(<a href='#SkMatrix_preScale_2_sx'>sx</a>, <a href='#SkMatrix_preScale_2_sy'>sy</a>) = | D E F | | 0 <a href='#SkMatrix_preScale_2_sy'>sy</a> 0 | = | D* < a href = '#SkMatrix_preScale_2_sx' > sx</ a > E*< a href = '#SkMatrix_preScale_2_sy' > sy</ a > F |
| G H < a href = '#SkMatrix_I' > I< / a > | | 0 0 1 | | G*< a href = '#SkMatrix_preScale_2_sx' > sx< / a > H*< a href = '#SkMatrix_preScale_2_sy' > sy< / a > < a href = '#SkMatrix_I' > I< / a > |
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### Parameters
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< table > < tr > < td > < a name = 'SkMatrix_preScale_2_sx' > < code > < strong > sx< / strong > < / code > < / a > < / td >
< td > horizontal scale factor< / td >
< / tr >
< tr > < td > < a name = 'SkMatrix_preScale_2_sy' > < code > < strong > sy< / strong > < / code > < / a > < / td >
< td > vertical scale factor< / td >
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< / tr >
< / table >
### Example
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< div > < fiddle-embed name = "@Matrix_preScale_2" > < / fiddle-embed > < / div >
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### See Also
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< a href = '#SkMatrix_postScale' > postScale< / a > < a href = '#SkMatrix_setScale' > setScale< / a > < a href = '#SkMatrix_MakeScale' > MakeScale< / a >
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< a name = 'SkMatrix_preRotate' > < / a >
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---
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< pre style = "padding: 1em 1em 1em 1em; width: 62.5em;background-color: #f0f0f0 " >
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void < a href = '#SkMatrix_preRotate' > preRotate< / a > (< a href = 'undocumented#SkScalar' > SkScalar< / a > degrees, < a href = 'undocumented#SkScalar' > SkScalar< / a > px, < a href = 'undocumented#SkScalar' > SkScalar< / a > py)
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< / pre >
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Sets < a href = 'SkMatrix_Reference#SkMatrix' > SkMatrix< / a > to < a href = 'SkMatrix_Reference#SkMatrix' > SkMatrix< / a > multiplied by < a href = 'SkMatrix_Reference#SkMatrix' > SkMatrix< / a > constructed from rotating by < a href = '#SkMatrix_preRotate_degrees' > degrees< / a >
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about pivot < a href = 'SkPoint_Reference#Point' > point< / a > (< a href = '#SkMatrix_preRotate_px' > px< / a > , < a href = '#SkMatrix_preRotate_py' > py< / a > ).
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This can be thought of as rotating about a pivot < a href = 'SkPoint_Reference#Point' > point< / a > before applying < a href = 'SkMatrix_Reference#SkMatrix' > SkMatrix< / a > .
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Positive < a href = '#SkMatrix_preRotate_degrees' > degrees< / a > rotates clockwise.
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Given:
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| A B C | | c -s dx |
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< a href = 'SkMatrix_Reference#Matrix' > Matrix< / a > = | D E F |, R(< a href = '#SkMatrix_preRotate_degrees' > degrees< / a > , < a href = '#SkMatrix_preRotate_px' > px< / a > , < a href = '#SkMatrix_preRotate_py' > py< / a > ) = | s c dy |
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| G H < a href = '#SkMatrix_I' > I< / a > | | 0 0 1 |
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where
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c = cos(< a href = '#SkMatrix_preRotate_degrees' > degrees< / a > )
s = sin(< a href = '#SkMatrix_preRotate_degrees' > degrees< / a > )
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dx = s * <a href='#SkMatrix_preRotate_py'>py</a> + (1 - c) * < a href = '#SkMatrix_preRotate_px' > px</ a >
dy = -s * <a href='#SkMatrix_preRotate_px'>px</a> + (1 - c) * < a href = '#SkMatrix_preRotate_py' > py</ a >
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sets < a href = 'SkMatrix_Reference#SkMatrix' > SkMatrix< / a > to:
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| A B C | | c -s dx | | Ac+Bs -As+Bc A*dx+B*dy+C |
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< a href = 'SkMatrix_Reference#Matrix' > Matrix< / a > * R(< a href = '#SkMatrix_preRotate_degrees' > degrees< / a > , < a href = '#SkMatrix_preRotate_px' > px< / a > , < a href = '#SkMatrix_preRotate_py' > py< / a > ) = | D E F | | s c dy | = | Dc+Es -Ds+Ec D*dx+E*dy+F |
| G H < a href = '#SkMatrix_I' > I< / a > | | 0 0 1 | | Gc+Hs -Gs+Hc G*dx+H*dy+< a href = '#SkMatrix_I' > I< / a > |
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### Parameters
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< table > < tr > < td > < a name = 'SkMatrix_preRotate_degrees' > < code > < strong > degrees< / strong > < / code > < / a > < / td >
< td > angle of axes relative to upright axes< / td >
< / tr >
< tr > < td > < a name = 'SkMatrix_preRotate_px' > < code > < strong > px< / strong > < / code > < / a > < / td >
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< td > pivot on x-axis< / td >
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< / tr >
< tr > < td > < a name = 'SkMatrix_preRotate_py' > < code > < strong > py< / strong > < / code > < / a > < / td >
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< td > pivot on y-axis< / td >
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< / tr >
< / table >
### Example
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< div > < fiddle-embed name = "@Matrix_preRotate" > < / fiddle-embed > < / div >
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### See Also
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< a href = '#SkMatrix_postRotate' > postRotate< / a > < a href = '#SkMatrix_setRotate' > setRotate< / a >
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< a name = 'SkMatrix_preRotate_2' > < / a >
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---
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< pre style = "padding: 1em 1em 1em 1em; width: 62.5em;background-color: #f0f0f0 " >
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void < a href = '#SkMatrix_preRotate' > preRotate< / a > (< a href = 'undocumented#SkScalar' > SkScalar< / a > degrees)
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< / pre >
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Sets < a href = 'SkMatrix_Reference#SkMatrix' > SkMatrix< / a > to < a href = 'SkMatrix_Reference#SkMatrix' > SkMatrix< / a > multiplied by < a href = 'SkMatrix_Reference#SkMatrix' > SkMatrix< / a > constructed from rotating by < a href = '#SkMatrix_preRotate_2_degrees' > degrees< / a >
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about pivot < a href = 'SkPoint_Reference#Point' > point< / a > (0, 0).
This can be thought of as rotating about the origin before applying < a href = 'SkMatrix_Reference#SkMatrix' > SkMatrix< / a > .
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Positive < a href = '#SkMatrix_preRotate_2_degrees' > degrees< / a > rotates clockwise.
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Given:
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| A B C | | c -s 0 |
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< a href = 'SkMatrix_Reference#Matrix' > Matrix< / a > = | D E F |, R(< a href = '#SkMatrix_preRotate_2_degrees' > degrees< / a > , px, py) = | s c 0 |
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| G H < a href = '#SkMatrix_I' > I< / a > | | 0 0 1 |
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where
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c = cos(< a href = '#SkMatrix_preRotate_2_degrees' > degrees< / a > )
s = sin(< a href = '#SkMatrix_preRotate_2_degrees' > degrees< / a > )
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sets < a href = 'SkMatrix_Reference#SkMatrix' > SkMatrix< / a > to:
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| A B C | | c -s 0 | | Ac+Bs -As+Bc C |
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< a href = 'SkMatrix_Reference#Matrix' > Matrix< / a > * R(< a href = '#SkMatrix_preRotate_2_degrees' > degrees< / a > , px, py) = | D E F | | s c 0 | = | Dc+Es -Ds+Ec F |
| G H < a href = '#SkMatrix_I' > I< / a > | | 0 0 1 | | Gc+Hs -Gs+Hc < a href = '#SkMatrix_I' > I< / a > |
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### Parameters
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< table > < tr > < td > < a name = 'SkMatrix_preRotate_2_degrees' > < code > < strong > degrees< / strong > < / code > < / a > < / td >
< td > angle of axes relative to upright axes< / td >
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< / tr >
< / table >
### Example
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< div > < fiddle-embed name = "@Matrix_preRotate_2" > < / fiddle-embed > < / div >
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### See Also
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< a href = '#SkMatrix_postRotate' > postRotate< / a > < a href = '#SkMatrix_setRotate' > setRotate< / a >
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< a name = 'SkMatrix_preSkew' > < / a >
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---
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< pre style = "padding: 1em 1em 1em 1em; width: 62.5em;background-color: #f0f0f0 " >
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void < a href = '#SkMatrix_preSkew' > preSkew< / a > (< a href = 'undocumented#SkScalar' > SkScalar< / a > kx, < a href = 'undocumented#SkScalar' > SkScalar< / a > ky, < a href = 'undocumented#SkScalar' > SkScalar< / a > px, < a href = 'undocumented#SkScalar' > SkScalar< / a > py)
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< / pre >
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Sets < a href = 'SkMatrix_Reference#SkMatrix' > SkMatrix< / a > to < a href = 'SkMatrix_Reference#SkMatrix' > SkMatrix< / a > multiplied by < a href = 'SkMatrix_Reference#SkMatrix' > SkMatrix< / a > constructed from skewing by (< a href = '#SkMatrix_preSkew_kx' > kx< / a > , < a href = '#SkMatrix_preSkew_ky' > ky< / a > )
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about pivot < a href = 'SkPoint_Reference#Point' > point< / a > (< a href = '#SkMatrix_preSkew_px' > px< / a > , < a href = '#SkMatrix_preSkew_py' > py< / a > ).
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This can be thought of as skewing about a pivot < a href = 'SkPoint_Reference#Point' > point< / a > before applying < a href = 'SkMatrix_Reference#SkMatrix' > SkMatrix< / a > .
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Given:
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| A B C | | 1 < a href = '#SkMatrix_preSkew_kx' > kx< / a > dx |
< a href = 'SkMatrix_Reference#Matrix' > Matrix< / a > = | D E F |, K(< a href = '#SkMatrix_preSkew_kx' > kx< / a > , < a href = '#SkMatrix_preSkew_ky' > ky< / a > , < a href = '#SkMatrix_preSkew_px' > px< / a > , < a href = '#SkMatrix_preSkew_py' > py< / a > ) = | < a href = '#SkMatrix_preSkew_ky' > ky< / a > 1 dy |
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| G H < a href = '#SkMatrix_I' > I< / a > | | 0 0 1 |
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where
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dx = -< a href = '#SkMatrix_preSkew_kx' > kx< / a > * < a href = '#SkMatrix_preSkew_py' > py< / a >
dy = -< a href = '#SkMatrix_preSkew_ky' > ky< / a > * < a href = '#SkMatrix_preSkew_px' > px< / a >
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sets < a href = 'SkMatrix_Reference#SkMatrix' > SkMatrix< / a > to:
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| A B C | | 1 < a href = '#SkMatrix_preSkew_kx' > kx< / a > dx | | A+B*< a href = '#SkMatrix_preSkew_ky' > ky< / a > A*< a href = '#SkMatrix_preSkew_kx' > kx< / a > +B A*dx+B*dy+C |
< a href = 'SkMatrix_Reference#Matrix' > Matrix</ a > * K(<a href='#SkMatrix_preSkew_kx'>kx</a>, <a href='#SkMatrix_preSkew_ky'>ky</a>, <a href='#SkMatrix_preSkew_px'>px</a>, <a href='#SkMatrix_preSkew_py'>py</a>) = | D E F | | <a href='#SkMatrix_preSkew_ky'>ky</a> 1 dy | = | D+E* < a href = '#SkMatrix_preSkew_ky' > ky</ a > D*< a href = '#SkMatrix_preSkew_kx' > kx</ a > +E D*dx+E*dy+F |
| G H < a href = '#SkMatrix_I' > I< / a > | | 0 0 1 | | G+H*< a href = '#SkMatrix_preSkew_ky' > ky< / a > G*< a href = '#SkMatrix_preSkew_kx' > kx< / a > +H G*dx+H*dy+< a href = '#SkMatrix_I' > I< / a > |
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### Parameters
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< table > < tr > < td > < a name = 'SkMatrix_preSkew_kx' > < code > < strong > kx< / strong > < / code > < / a > < / td >
< td > horizontal skew factor< / td >
< / tr >
< tr > < td > < a name = 'SkMatrix_preSkew_ky' > < code > < strong > ky< / strong > < / code > < / a > < / td >
< td > vertical skew factor< / td >
< / tr >
< tr > < td > < a name = 'SkMatrix_preSkew_px' > < code > < strong > px< / strong > < / code > < / a > < / td >
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< td > pivot on x-axis< / td >
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< / tr >
< tr > < td > < a name = 'SkMatrix_preSkew_py' > < code > < strong > py< / strong > < / code > < / a > < / td >
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< td > pivot on y-axis< / td >
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< / tr >
< / table >
### Example
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< div > < fiddle-embed name = "@Matrix_preSkew" > < / fiddle-embed > < / div >
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### See Also
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< a href = '#SkMatrix_postSkew' > postSkew< / a > < a href = '#SkMatrix_setSkew' > setSkew< / a >
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< a name = 'SkMatrix_preSkew_2' > < / a >
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---
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< pre style = "padding: 1em 1em 1em 1em; width: 62.5em;background-color: #f0f0f0 " >
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void < a href = '#SkMatrix_preSkew' > preSkew< / a > (< a href = 'undocumented#SkScalar' > SkScalar< / a > kx, < a href = 'undocumented#SkScalar' > SkScalar< / a > ky)
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< / pre >
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Sets < a href = 'SkMatrix_Reference#SkMatrix' > SkMatrix< / a > to < a href = 'SkMatrix_Reference#SkMatrix' > SkMatrix< / a > multiplied by < a href = 'SkMatrix_Reference#SkMatrix' > SkMatrix< / a > constructed from skewing by (< a href = '#SkMatrix_preSkew_2_kx' > kx< / a > , < a href = '#SkMatrix_preSkew_2_ky' > ky< / a > )
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about pivot < a href = 'SkPoint_Reference#Point' > point< / a > (0, 0).
This can be thought of as skewing about the origin before applying < a href = 'SkMatrix_Reference#SkMatrix' > SkMatrix< / a > .
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Given:
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| A B C | | 1 < a href = '#SkMatrix_preSkew_2_kx' > kx< / a > 0 |
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< a href = 'SkMatrix_Reference#Matrix' > Matrix< / a > = | D E F |, K(< a href = '#SkMatrix_preSkew_2_kx' > kx< / a > , < a href = '#SkMatrix_preSkew_2_ky' > ky< / a > ) = | < a href = '#SkMatrix_preSkew_2_ky' > ky< / a > 1 0 |
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| G H < a href = '#SkMatrix_I' > I< / a > | | 0 0 1 |
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sets < a href = 'SkMatrix_Reference#SkMatrix' > SkMatrix< / a > to:
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| A B C | | 1 < a href = '#SkMatrix_preSkew_2_kx' > kx< / a > 0 | | A+B*< a href = '#SkMatrix_preSkew_2_ky' > ky< / a > A*< a href = '#SkMatrix_preSkew_2_kx' > kx< / a > +B C |
< a href = 'SkMatrix_Reference#Matrix' > Matrix</ a > * K(<a href='#SkMatrix_preSkew_2_kx'>kx</a>, <a href='#SkMatrix_preSkew_2_ky'>ky</a>) = | D E F | | <a href='#SkMatrix_preSkew_2_ky'>ky</a> 1 0 | = | D+E* < a href = '#SkMatrix_preSkew_2_ky' > ky</ a > D*< a href = '#SkMatrix_preSkew_2_kx' > kx</ a > +E F |
| G H < a href = '#SkMatrix_I' > I< / a > | | 0 0 1 | | G+H*< a href = '#SkMatrix_preSkew_2_ky' > ky< / a > G*< a href = '#SkMatrix_preSkew_2_kx' > kx< / a > +H < a href = '#SkMatrix_I' > I< / a > |
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### Parameters
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< table > < tr > < td > < a name = 'SkMatrix_preSkew_2_kx' > < code > < strong > kx< / strong > < / code > < / a > < / td >
< td > horizontal skew factor< / td >
< / tr >
< tr > < td > < a name = 'SkMatrix_preSkew_2_ky' > < code > < strong > ky< / strong > < / code > < / a > < / td >
< td > vertical skew factor< / td >
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< / tr >
< / table >
### Example
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< div > < fiddle-embed name = "@Matrix_preSkew_2" > < / fiddle-embed > < / div >
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### See Also
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< a href = '#SkMatrix_postSkew' > postSkew< / a > < a href = '#SkMatrix_setSkew' > setSkew< / a >
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< a name = 'SkMatrix_preConcat' > < / a >
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---
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2018-05-16 11:07:07 +00:00
< pre style = "padding: 1em 1em 1em 1em; width: 62.5em;background-color: #f0f0f0 " >
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void < a href = '#SkMatrix_preConcat' > preConcat< / a > (const < a href = 'SkMatrix_Reference#SkMatrix' > SkMatrix< / a > & other)
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< / pre >
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Sets < a href = 'SkMatrix_Reference#SkMatrix' > SkMatrix< / a > to < a href = 'SkMatrix_Reference#SkMatrix' > SkMatrix< / a > multiplied by < a href = 'SkMatrix_Reference#SkMatrix' > SkMatrix< / a > < a href = '#SkMatrix_preConcat_other' > other< / a > .
This can be thought of mapping by < a href = '#SkMatrix_preConcat_other' > other< / a > before applying < a href = 'SkMatrix_Reference#SkMatrix' > SkMatrix< / a > .
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Given:
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| A B C | | J K L |
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< a href = 'SkMatrix_Reference#Matrix' > Matrix< / a > = | D E F |, < a href = '#SkMatrix_preConcat_other' > other< / a > = | M N O |
| G H < a href = '#SkMatrix_I' > I< / a > | | P Q R |
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sets < a href = 'SkMatrix_Reference#SkMatrix' > SkMatrix< / a > to:
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| A B C | | J K L | | AJ+BM+CP AK+BN+CQ AL+BO+CR |
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< a href = 'SkMatrix_Reference#Matrix' > Matrix</ a > * <a href='#SkMatrix_preConcat_other'>other</a> = | D E F | * | M N O | = | DJ+EM+FP DK+EN+FQ DL+EO+FR |
| G H < a href = '#SkMatrix_I' > I< / a > | | P Q R | | GJ+HM+IP GK+HN+IQ GL+HO+IR |
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### Parameters
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< table > < tr > < td > < a name = 'SkMatrix_preConcat_other' > < code > < strong > other< / strong > < / code > < / a > < / td >
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< td > < a href = 'SkMatrix_Reference#SkMatrix' > SkMatrix< / a > on right side of multiply expression< / td >
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< / tr >
< / table >
### Example
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< div > < fiddle-embed name = "@Matrix_preConcat" > < div > < a href = '#SkMatrix_setPolyToPoly' > setPolyToPoly< / a > creates perspective < a href = 'SkMatrix_Reference#Matrix' > matrices< / a > , one the inverse of the < a href = '#SkMatrix_preConcat_other' > other< / a > .
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Multiplying the < a href = 'SkMatrix_Reference#Matrix' > matrix< / a > by its inverse turns into an identity < a href = 'SkMatrix_Reference#Matrix' > matrix< / a > .
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< / div > < / fiddle-embed > < / div >
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### See Also
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< a href = '#SkMatrix_postConcat' > postConcat< / a > < a href = '#SkMatrix_setConcat' > setConcat< / a > < a href = '#SkMatrix_Concat' > Concat< / a >
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< a name = 'SkMatrix_postTranslate' > < / a >
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---
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< pre style = "padding: 1em 1em 1em 1em; width: 62.5em;background-color: #f0f0f0 " >
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void < a href = '#SkMatrix_postTranslate' > postTranslate< / a > (< a href = 'undocumented#SkScalar' > SkScalar< / a > dx, < a href = 'undocumented#SkScalar' > SkScalar< / a > dy)
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< / pre >
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Sets < a href = 'SkMatrix_Reference#SkMatrix' > SkMatrix< / a > to < a href = 'SkMatrix_Reference#SkMatrix' > SkMatrix< / a > constructed from translation (< a href = '#SkMatrix_postTranslate_dx' > dx< / a > , < a href = '#SkMatrix_postTranslate_dy' > dy< / a > ) multiplied by < a href = 'SkMatrix_Reference#SkMatrix' > SkMatrix< / a > .
This can be thought of as moving the < a href = 'SkPoint_Reference#Point' > point< / a > to be mapped after applying < a href = 'SkMatrix_Reference#SkMatrix' > SkMatrix< / a > .
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Given:
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| J K L | | 1 0 < a href = '#SkMatrix_postTranslate_dx' > dx< / a > |
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< a href = 'SkMatrix_Reference#Matrix' > Matrix< / a > = | M N O |, T(< a href = '#SkMatrix_postTranslate_dx' > dx< / a > , < a href = '#SkMatrix_postTranslate_dy' > dy< / a > ) = | 0 1 < a href = '#SkMatrix_postTranslate_dy' > dy< / a > |
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| P Q R | | 0 0 1 |
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sets < a href = 'SkMatrix_Reference#SkMatrix' > SkMatrix< / a > to:
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| 1 0 < a href = '#SkMatrix_postTranslate_dx' > dx< / a > | | J K L | | J+< a href = '#SkMatrix_postTranslate_dx' > dx< / a > *P K+< a href = '#SkMatrix_postTranslate_dx' > dx< / a > *Q L+< a href = '#SkMatrix_postTranslate_dx' > dx< / a > *R |
T(< a href = '#SkMatrix_postTranslate_dx' > dx< / a > , < a href = '#SkMatrix_postTranslate_dy' > dy< / a > ) * < a href = 'SkMatrix_Reference#Matrix' > Matrix< / a > = | 0 1 < a href = '#SkMatrix_postTranslate_dy' > dy< / a > | | M N O | = | M+< a href = '#SkMatrix_postTranslate_dy' > dy< / a > *P N+< a href = '#SkMatrix_postTranslate_dy' > dy< / a > *Q O+< a href = '#SkMatrix_postTranslate_dy' > dy< / a > *R |
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| 0 0 1 | | P Q R | | P Q R |
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### Parameters
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< table > < tr > < td > < a name = 'SkMatrix_postTranslate_dx' > < code > < strong > dx< / strong > < / code > < / a > < / td >
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< td > x-axis translation after applying < a href = 'SkMatrix_Reference#SkMatrix' > SkMatrix< / a > < / td >
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< / tr >
< tr > < td > < a name = 'SkMatrix_postTranslate_dy' > < code > < strong > dy< / strong > < / code > < / a > < / td >
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< td > y-axis translation after applying < a href = 'SkMatrix_Reference#SkMatrix' > SkMatrix< / a > < / td >
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< / tr >
< / table >
### Example
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< div > < fiddle-embed name = "@Matrix_postTranslate" > < div > Compare with < a href = '#SkMatrix_preTranslate' > preTranslate< / a > example.
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< / div > < / fiddle-embed > < / div >
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### See Also
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< a href = '#SkMatrix_preTranslate' > preTranslate< / a > < a href = '#SkMatrix_setTranslate' > setTranslate< / a > < a href = '#SkMatrix_MakeTrans' > MakeTrans< / a >
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< a name = 'SkMatrix_postScale' > < / a >
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---
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< pre style = "padding: 1em 1em 1em 1em; width: 62.5em;background-color: #f0f0f0 " >
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void < a href = '#SkMatrix_postScale' > postScale< / a > (< a href = 'undocumented#SkScalar' > SkScalar< / a > sx, < a href = 'undocumented#SkScalar' > SkScalar< / a > sy, < a href = 'undocumented#SkScalar' > SkScalar< / a > px, < a href = 'undocumented#SkScalar' > SkScalar< / a > py)
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< / pre >
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Sets < a href = 'SkMatrix_Reference#SkMatrix' > SkMatrix< / a > to < a href = 'SkMatrix_Reference#SkMatrix' > SkMatrix< / a > constructed from scaling by (< a href = '#SkMatrix_postScale_sx' > sx< / a > , < a href = '#SkMatrix_postScale_sy' > sy< / a > ) about pivot < a href = 'SkPoint_Reference#Point' > point< / a >
(< a href = '#SkMatrix_postScale_px' > px< / a > , < a href = '#SkMatrix_postScale_py' > py< / a > ), multiplied by < a href = 'SkMatrix_Reference#SkMatrix' > SkMatrix< / a > .
This can be thought of as scaling about a pivot < a href = 'SkPoint_Reference#Point' > point< / a > after applying < a href = 'SkMatrix_Reference#SkMatrix' > SkMatrix< / a > .
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Given:
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| J K L | | < a href = '#SkMatrix_postScale_sx' > sx< / a > 0 dx |
< a href = 'SkMatrix_Reference#Matrix' > Matrix< / a > = | M N O |, S(< a href = '#SkMatrix_postScale_sx' > sx< / a > , < a href = '#SkMatrix_postScale_sy' > sy< / a > , < a href = '#SkMatrix_postScale_px' > px< / a > , < a href = '#SkMatrix_postScale_py' > py< / a > ) = | 0 < a href = '#SkMatrix_postScale_sy' > sy< / a > dy |
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| P Q R | | 0 0 1 |
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where
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dx = < a href = '#SkMatrix_postScale_px' > px< / a > - < a href = '#SkMatrix_postScale_sx' > sx< / a > * < a href = '#SkMatrix_postScale_px' > px< / a >
dy = < a href = '#SkMatrix_postScale_py' > py< / a > - < a href = '#SkMatrix_postScale_sy' > sy< / a > * < a href = '#SkMatrix_postScale_py' > py< / a >
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sets < a href = 'SkMatrix_Reference#SkMatrix' > SkMatrix< / a > to:
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| < a href = '#SkMatrix_postScale_sx' > sx< / a > 0 dx | | J K L | | < a href = '#SkMatrix_postScale_sx' > sx< / a > *J+dx*P < a href = '#SkMatrix_postScale_sx' > sx< / a > *K+dx*Q < a href = '#SkMatrix_postScale_sx' > sx< / a > *L+dx+R |
S(< a href = '#SkMatrix_postScale_sx' > sx< / a > , < a href = '#SkMatrix_postScale_sy' > sy< / a > , < a href = '#SkMatrix_postScale_px' > px< / a > , < a href = '#SkMatrix_postScale_py' > py< / a > ) * < a href = 'SkMatrix_Reference#Matrix' > Matrix< / a > = | 0 < a href = '#SkMatrix_postScale_sy' > sy< / a > dy | | M N O | = | < a href = '#SkMatrix_postScale_sy' > sy< / a > *M+dy*P < a href = '#SkMatrix_postScale_sy' > sy< / a > *N+dy*Q < a href = '#SkMatrix_postScale_sy' > sy< / a > *O+dy*R |
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| 0 0 1 | | P Q R | | P Q R |
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### Parameters
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< table > < tr > < td > < a name = 'SkMatrix_postScale_sx' > < code > < strong > sx< / strong > < / code > < / a > < / td >
< td > horizontal scale factor< / td >
< / tr >
< tr > < td > < a name = 'SkMatrix_postScale_sy' > < code > < strong > sy< / strong > < / code > < / a > < / td >
< td > vertical scale factor< / td >
< / tr >
< tr > < td > < a name = 'SkMatrix_postScale_px' > < code > < strong > px< / strong > < / code > < / a > < / td >
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< td > pivot on x-axis< / td >
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< / tr >
< tr > < td > < a name = 'SkMatrix_postScale_py' > < code > < strong > py< / strong > < / code > < / a > < / td >
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< td > pivot on y-axis< / td >
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< / tr >
< / table >
### Example
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< div > < fiddle-embed name = "@Matrix_postScale" > < / fiddle-embed > < / div >
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### See Also
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< a href = '#SkMatrix_preScale' > preScale< / a > < a href = '#SkMatrix_setScale' > setScale< / a > < a href = '#SkMatrix_MakeScale' > MakeScale< / a >
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< a name = 'SkMatrix_postScale_2' > < / a >
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---
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< pre style = "padding: 1em 1em 1em 1em; width: 62.5em;background-color: #f0f0f0 " >
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void < a href = '#SkMatrix_postScale' > postScale< / a > (< a href = 'undocumented#SkScalar' > SkScalar< / a > sx, < a href = 'undocumented#SkScalar' > SkScalar< / a > sy)
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< / pre >
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Sets < a href = 'SkMatrix_Reference#SkMatrix' > SkMatrix< / a > to < a href = 'SkMatrix_Reference#SkMatrix' > SkMatrix< / a > constructed from scaling by (< a href = '#SkMatrix_postScale_2_sx' > sx< / a > , < a href = '#SkMatrix_postScale_2_sy' > sy< / a > ) about pivot < a href = 'SkPoint_Reference#Point' > point< / a >
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(0, 0), multiplied by < a href = 'SkMatrix_Reference#SkMatrix' > SkMatrix< / a > .
This can be thought of as scaling about the origin after applying < a href = 'SkMatrix_Reference#SkMatrix' > SkMatrix< / a > .
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Given:
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| J K L | | < a href = '#SkMatrix_postScale_2_sx' > sx< / a > 0 0 |
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< a href = 'SkMatrix_Reference#Matrix' > Matrix< / a > = | M N O |, S(< a href = '#SkMatrix_postScale_2_sx' > sx< / a > , < a href = '#SkMatrix_postScale_2_sy' > sy< / a > ) = | 0 < a href = '#SkMatrix_postScale_2_sy' > sy< / a > 0 |
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| P Q R | | 0 0 1 |
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sets < a href = 'SkMatrix_Reference#SkMatrix' > SkMatrix< / a > to:
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| < a href = '#SkMatrix_postScale_2_sx' > sx< / a > 0 0 | | J K L | | < a href = '#SkMatrix_postScale_2_sx' > sx< / a > *J < a href = '#SkMatrix_postScale_2_sx' > sx< / a > *K < a href = '#SkMatrix_postScale_2_sx' > sx< / a > *L |
S(< a href = '#SkMatrix_postScale_2_sx' > sx< / a > , < a href = '#SkMatrix_postScale_2_sy' > sy< / a > ) * < a href = 'SkMatrix_Reference#Matrix' > Matrix< / a > = | 0 < a href = '#SkMatrix_postScale_2_sy' > sy< / a > 0 | | M N O | = | < a href = '#SkMatrix_postScale_2_sy' > sy< / a > *M < a href = '#SkMatrix_postScale_2_sy' > sy< / a > *N < a href = '#SkMatrix_postScale_2_sy' > sy< / a > *O |
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| 0 0 1 | | P Q R | | P Q R |
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### Parameters
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< table > < tr > < td > < a name = 'SkMatrix_postScale_2_sx' > < code > < strong > sx< / strong > < / code > < / a > < / td >
< td > horizontal scale factor< / td >
< / tr >
< tr > < td > < a name = 'SkMatrix_postScale_2_sy' > < code > < strong > sy< / strong > < / code > < / a > < / td >
< td > vertical scale factor< / td >
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< / tr >
< / table >
### Example
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< div > < fiddle-embed name = "@Matrix_postScale_2" > < / fiddle-embed > < / div >
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### See Also
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< a href = '#SkMatrix_preScale' > preScale< / a > < a href = '#SkMatrix_setScale' > setScale< / a > < a href = '#SkMatrix_MakeScale' > MakeScale< / a >
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< a name = 'SkMatrix_postIDiv' > < / a >
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---
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< pre style = "padding: 1em 1em 1em 1em; width: 62.5em;background-color: #f0f0f0 " >
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bool < a href = '#SkMatrix_postIDiv' > postIDiv< / a > (int divx, int divy)
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< / pre >
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Sets < a href = 'SkMatrix_Reference#Matrix' > Matrix< / a > to < a href = 'SkMatrix_Reference#Matrix' > Matrix< / a > constructed from scaling by (1/< a href = '#SkMatrix_postIDiv_divx' > divx< / a > , 1/< a href = '#SkMatrix_postIDiv_divy' > divy< / a > ),
multiplied by < a href = 'SkMatrix_Reference#Matrix' > Matrix< / a > .
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Returns false if either < a href = '#SkMatrix_postIDiv_divx' > divx< / a > or < a href = '#SkMatrix_postIDiv_divy' > divy< / a > is zero.
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Given:
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< pre style = "padding: 1em 1em 1em 1em;width: 62.5em; background-color: #f0f0f0 " >
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| J K L | | sx 0 0 |
Matrix = | M N O |, I(divx, divy) = | 0 sy 0 |
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| P Q R | | 0 0 1 |
< / pre >
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where
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< pre style = "padding: 1em 1em 1em 1em;width: 62.5em; background-color: #f0f0f0 " >
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sx = 1 / divx
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sy = 1 / divy
< / pre >
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sets < a href = 'SkMatrix_Reference#Matrix' > Matrix< / a > to:
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< pre style = "padding: 1em 1em 1em 1em;width: 62.5em; background-color: #f0f0f0 " >
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| sx 0 0 | | J K L | | sx*J sx*K sx*L |
I(divx, divy) * Matrix = | 0 sy 0 | | M N O | = | sy*M sy*N sy*O |
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| 0 0 1 | | P Q R | | P Q R |
< / pre >
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### Parameters
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< table > < tr > < td > < a name = 'SkMatrix_postIDiv_divx' > < code > < strong > divx< / strong > < / code > < / a > < / td >
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< td > integer divisor for inverse scale on x-axis< / td >
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< / tr >
< tr > < td > < a name = 'SkMatrix_postIDiv_divy' > < code > < strong > divy< / strong > < / code > < / a > < / td >
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< td > integer divisor for inverse scale on y-axis< / td >
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< / tr >
< / table >
### Return Value
true on successful scale
### Example
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< div > < fiddle-embed name = "@Matrix_063" > < / fiddle-embed > < / div >
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### See Also
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< a href = '#SkMatrix_postScale' > postScale< / a > < a href = '#SkMatrix_MakeScale' > MakeScale< / a >
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< a name = 'SkMatrix_postRotate' > < / a >
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---
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2018-05-16 11:07:07 +00:00
< pre style = "padding: 1em 1em 1em 1em; width: 62.5em;background-color: #f0f0f0 " >
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void < a href = '#SkMatrix_postRotate' > postRotate< / a > (< a href = 'undocumented#SkScalar' > SkScalar< / a > degrees, < a href = 'undocumented#SkScalar' > SkScalar< / a > px, < a href = 'undocumented#SkScalar' > SkScalar< / a > py)
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< / pre >
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Sets < a href = 'SkMatrix_Reference#SkMatrix' > SkMatrix< / a > to < a href = 'SkMatrix_Reference#SkMatrix' > SkMatrix< / a > constructed from rotating by < a href = '#SkMatrix_postRotate_degrees' > degrees< / a > about pivot < a href = 'SkPoint_Reference#Point' > point< / a >
(< a href = '#SkMatrix_postRotate_px' > px< / a > , < a href = '#SkMatrix_postRotate_py' > py< / a > ), multiplied by < a href = 'SkMatrix_Reference#SkMatrix' > SkMatrix< / a > .
This can be thought of as rotating about a pivot < a href = 'SkPoint_Reference#Point' > point< / a > after applying < a href = 'SkMatrix_Reference#SkMatrix' > SkMatrix< / a > .
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Positive < a href = '#SkMatrix_postRotate_degrees' > degrees< / a > rotates clockwise.
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Given:
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| J K L | | c -s dx |
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< a href = 'SkMatrix_Reference#Matrix' > Matrix< / a > = | M N O |, R(< a href = '#SkMatrix_postRotate_degrees' > degrees< / a > , < a href = '#SkMatrix_postRotate_px' > px< / a > , < a href = '#SkMatrix_postRotate_py' > py< / a > ) = | s c dy |
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| P Q R | | 0 0 1 |
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where
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c = cos(< a href = '#SkMatrix_postRotate_degrees' > degrees< / a > )
s = sin(< a href = '#SkMatrix_postRotate_degrees' > degrees< / a > )
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dx = s * <a href='#SkMatrix_postRotate_py'>py</a> + (1 - c) * < a href = '#SkMatrix_postRotate_px' > px</ a >
dy = -s * <a href='#SkMatrix_postRotate_px'>px</a> + (1 - c) * < a href = '#SkMatrix_postRotate_py' > py</ a >
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sets < a href = 'SkMatrix_Reference#SkMatrix' > SkMatrix< / a > to:
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|c -s dx| |J K L| |cJ-sM+dx*P cK-sN+dx*Q cL-sO+dx+R|
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R(< a href = '#SkMatrix_postRotate_degrees' > degrees< / a > , < a href = '#SkMatrix_postRotate_px' > px< / a > , < a href = '#SkMatrix_postRotate_py' > py< / a > ) * < a href = 'SkMatrix_Reference#Matrix' > Matrix< / a > = |s c dy| |M N O| = |sJ+cM+dy*P sK+cN+dy*Q sL+cO+dy*R|
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|0 0 1| |P Q R| | P Q R|
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### Parameters
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< table > < tr > < td > < a name = 'SkMatrix_postRotate_degrees' > < code > < strong > degrees< / strong > < / code > < / a > < / td >
< td > angle of axes relative to upright axes< / td >
< / tr >
< tr > < td > < a name = 'SkMatrix_postRotate_px' > < code > < strong > px< / strong > < / code > < / a > < / td >
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< td > pivot on x-axis< / td >
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< / tr >
< tr > < td > < a name = 'SkMatrix_postRotate_py' > < code > < strong > py< / strong > < / code > < / a > < / td >
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< td > pivot on y-axis< / td >
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< / tr >
< / table >
### Example
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< div > < fiddle-embed name = "@Matrix_postRotate" > < / fiddle-embed > < / div >
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### See Also
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< a href = '#SkMatrix_preRotate' > preRotate< / a > < a href = '#SkMatrix_setRotate' > setRotate< / a >
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< a name = 'SkMatrix_postRotate_2' > < / a >
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---
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< pre style = "padding: 1em 1em 1em 1em; width: 62.5em;background-color: #f0f0f0 " >
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void < a href = '#SkMatrix_postRotate' > postRotate< / a > (< a href = 'undocumented#SkScalar' > SkScalar< / a > degrees)
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< / pre >
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Sets < a href = 'SkMatrix_Reference#SkMatrix' > SkMatrix< / a > to < a href = 'SkMatrix_Reference#SkMatrix' > SkMatrix< / a > constructed from rotating by < a href = '#SkMatrix_postRotate_2_degrees' > degrees< / a > about pivot < a href = 'SkPoint_Reference#Point' > point< / a >
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(0, 0), multiplied by < a href = 'SkMatrix_Reference#SkMatrix' > SkMatrix< / a > .
This can be thought of as rotating about the origin after applying < a href = 'SkMatrix_Reference#SkMatrix' > SkMatrix< / a > .
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Positive < a href = '#SkMatrix_postRotate_2_degrees' > degrees< / a > rotates clockwise.
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Given:
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| J K L | | c -s 0 |
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< a href = 'SkMatrix_Reference#Matrix' > Matrix< / a > = | M N O |, R(< a href = '#SkMatrix_postRotate_2_degrees' > degrees< / a > , px, py) = | s c 0 |
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| P Q R | | 0 0 1 |
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where
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c = cos(< a href = '#SkMatrix_postRotate_2_degrees' > degrees< / a > )
s = sin(< a href = '#SkMatrix_postRotate_2_degrees' > degrees< / a > )
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sets < a href = 'SkMatrix_Reference#SkMatrix' > SkMatrix< / a > to:
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| c -s dx | | J K L | | cJ-sM cK-sN cL-sO |
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R(< a href = '#SkMatrix_postRotate_2_degrees' > degrees< / a > , px, py) * < a href = 'SkMatrix_Reference#Matrix' > Matrix< / a > = | s c dy | | M N O | = | sJ+cM sK+cN sL+cO |
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| 0 0 1 | | P Q R | | P Q R |
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### Parameters
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< table > < tr > < td > < a name = 'SkMatrix_postRotate_2_degrees' > < code > < strong > degrees< / strong > < / code > < / a > < / td >
< td > angle of axes relative to upright axes< / td >
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< / tr >
< / table >
### Example
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< div > < fiddle-embed name = "@Matrix_postRotate_2" > < / fiddle-embed > < / div >
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### See Also
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< a href = '#SkMatrix_preRotate' > preRotate< / a > < a href = '#SkMatrix_setRotate' > setRotate< / a >
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< a name = 'SkMatrix_postSkew' > < / a >
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---
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< pre style = "padding: 1em 1em 1em 1em; width: 62.5em;background-color: #f0f0f0 " >
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void < a href = '#SkMatrix_postSkew' > postSkew< / a > (< a href = 'undocumented#SkScalar' > SkScalar< / a > kx, < a href = 'undocumented#SkScalar' > SkScalar< / a > ky, < a href = 'undocumented#SkScalar' > SkScalar< / a > px, < a href = 'undocumented#SkScalar' > SkScalar< / a > py)
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< / pre >
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Sets < a href = 'SkMatrix_Reference#SkMatrix' > SkMatrix< / a > to < a href = 'SkMatrix_Reference#SkMatrix' > SkMatrix< / a > constructed from skewing by (< a href = '#SkMatrix_postSkew_kx' > kx< / a > , < a href = '#SkMatrix_postSkew_ky' > ky< / a > ) about pivot < a href = 'SkPoint_Reference#Point' > point< / a >
(< a href = '#SkMatrix_postSkew_px' > px< / a > , < a href = '#SkMatrix_postSkew_py' > py< / a > ), multiplied by < a href = 'SkMatrix_Reference#SkMatrix' > SkMatrix< / a > .
This can be thought of as skewing about a pivot < a href = 'SkPoint_Reference#Point' > point< / a > after applying < a href = 'SkMatrix_Reference#SkMatrix' > SkMatrix< / a > .
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Given:
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| J K L | | 1 < a href = '#SkMatrix_postSkew_kx' > kx< / a > dx |
< a href = 'SkMatrix_Reference#Matrix' > Matrix< / a > = | M N O |, K(< a href = '#SkMatrix_postSkew_kx' > kx< / a > , < a href = '#SkMatrix_postSkew_ky' > ky< / a > , < a href = '#SkMatrix_postSkew_px' > px< / a > , < a href = '#SkMatrix_postSkew_py' > py< / a > ) = | < a href = '#SkMatrix_postSkew_ky' > ky< / a > 1 dy |
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| P Q R | | 0 0 1 |
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where
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dx = -< a href = '#SkMatrix_postSkew_kx' > kx< / a > * < a href = '#SkMatrix_postSkew_py' > py< / a >
dy = -< a href = '#SkMatrix_postSkew_ky' > ky< / a > * < a href = '#SkMatrix_postSkew_px' > px< / a >
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sets < a href = 'SkMatrix_Reference#SkMatrix' > SkMatrix< / a > to:
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| 1 < a href = '#SkMatrix_postSkew_kx' > kx< / a > dx| |J K L| |J+< a href = '#SkMatrix_postSkew_kx' > kx< / a > *M+dx*P K+< a href = '#SkMatrix_postSkew_kx' > kx< / a > *N+dx*Q L+< a href = '#SkMatrix_postSkew_kx' > kx< / a > *O+dx+R|
K(< a href = '#SkMatrix_postSkew_kx' > kx< / a > , < a href = '#SkMatrix_postSkew_ky' > ky< / a > , < a href = '#SkMatrix_postSkew_px' > px< / a > , < a href = '#SkMatrix_postSkew_py' > py< / a > ) * < a href = 'SkMatrix_Reference#Matrix' > Matrix< / a > = |< a href = '#SkMatrix_postSkew_ky' > ky< / a > 1 dy| |M N O| = |< a href = '#SkMatrix_postSkew_ky' > ky< / a > *J+M+dy*P < a href = '#SkMatrix_postSkew_ky' > ky< / a > *K+N+dy*Q < a href = '#SkMatrix_postSkew_ky' > ky< / a > *L+O+dy*R|
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| 0 0 1| |P Q R| | P Q R|
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### Parameters
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< table > < tr > < td > < a name = 'SkMatrix_postSkew_kx' > < code > < strong > kx< / strong > < / code > < / a > < / td >
< td > horizontal skew factor< / td >
< / tr >
< tr > < td > < a name = 'SkMatrix_postSkew_ky' > < code > < strong > ky< / strong > < / code > < / a > < / td >
< td > vertical skew factor< / td >
< / tr >
< tr > < td > < a name = 'SkMatrix_postSkew_px' > < code > < strong > px< / strong > < / code > < / a > < / td >
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< td > pivot on x-axis< / td >
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< / tr >
< tr > < td > < a name = 'SkMatrix_postSkew_py' > < code > < strong > py< / strong > < / code > < / a > < / td >
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< td > pivot on y-axis< / td >
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< / tr >
< / table >
### Example
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< div > < fiddle-embed name = "@Matrix_postSkew" > < / fiddle-embed > < / div >
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### See Also
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< a href = '#SkMatrix_preSkew' > preSkew< / a > < a href = '#SkMatrix_setSkew' > setSkew< / a >
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< a name = 'SkMatrix_postSkew_2' > < / a >
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---
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< pre style = "padding: 1em 1em 1em 1em; width: 62.5em;background-color: #f0f0f0 " >
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void < a href = '#SkMatrix_postSkew' > postSkew< / a > (< a href = 'undocumented#SkScalar' > SkScalar< / a > kx, < a href = 'undocumented#SkScalar' > SkScalar< / a > ky)
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< / pre >
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Sets < a href = 'SkMatrix_Reference#SkMatrix' > SkMatrix< / a > to < a href = 'SkMatrix_Reference#SkMatrix' > SkMatrix< / a > constructed from skewing by (< a href = '#SkMatrix_postSkew_2_kx' > kx< / a > , < a href = '#SkMatrix_postSkew_2_ky' > ky< / a > ) about pivot < a href = 'SkPoint_Reference#Point' > point< / a >
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(0, 0), multiplied by < a href = 'SkMatrix_Reference#SkMatrix' > SkMatrix< / a > .
This can be thought of as skewing about the origin after applying < a href = 'SkMatrix_Reference#SkMatrix' > SkMatrix< / a > .
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Given:
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| J K L | | 1 < a href = '#SkMatrix_postSkew_2_kx' > kx< / a > 0 |
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< a href = 'SkMatrix_Reference#Matrix' > Matrix< / a > = | M N O |, K(< a href = '#SkMatrix_postSkew_2_kx' > kx< / a > , < a href = '#SkMatrix_postSkew_2_ky' > ky< / a > ) = | < a href = '#SkMatrix_postSkew_2_ky' > ky< / a > 1 0 |
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| P Q R | | 0 0 1 |
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sets < a href = 'SkMatrix_Reference#SkMatrix' > SkMatrix< / a > to:
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| 1 < a href = '#SkMatrix_postSkew_2_kx' > kx< / a > 0 | | J K L | | J+< a href = '#SkMatrix_postSkew_2_kx' > kx< / a > *M K+< a href = '#SkMatrix_postSkew_2_kx' > kx< / a > *N L+< a href = '#SkMatrix_postSkew_2_kx' > kx< / a > *O |
K(< a href = '#SkMatrix_postSkew_2_kx' > kx< / a > , < a href = '#SkMatrix_postSkew_2_ky' > ky< / a > ) * < a href = 'SkMatrix_Reference#Matrix' > Matrix< / a > = | < a href = '#SkMatrix_postSkew_2_ky' > ky< / a > 1 0 | | M N O | = | < a href = '#SkMatrix_postSkew_2_ky' > ky< / a > *J+M < a href = '#SkMatrix_postSkew_2_ky' > ky< / a > *K+N < a href = '#SkMatrix_postSkew_2_ky' > ky< / a > *L+O |
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| 0 0 1 | | P Q R | | P Q R |
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### Parameters
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< table > < tr > < td > < a name = 'SkMatrix_postSkew_2_kx' > < code > < strong > kx< / strong > < / code > < / a > < / td >
< td > horizontal skew factor< / td >
< / tr >
< tr > < td > < a name = 'SkMatrix_postSkew_2_ky' > < code > < strong > ky< / strong > < / code > < / a > < / td >
< td > vertical skew factor< / td >
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< / tr >
< / table >
### Example
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< div > < fiddle-embed name = "@Matrix_postSkew_2" > < / fiddle-embed > < / div >
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### See Also
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< a href = '#SkMatrix_preSkew' > preSkew< / a > < a href = '#SkMatrix_setSkew' > setSkew< / a >
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< a name = 'SkMatrix_postConcat' > < / a >
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---
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< pre style = "padding: 1em 1em 1em 1em; width: 62.5em;background-color: #f0f0f0 " >
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void < a href = '#SkMatrix_postConcat' > postConcat< / a > (const < a href = 'SkMatrix_Reference#SkMatrix' > SkMatrix< / a > & other)
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< / pre >
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Sets < a href = 'SkMatrix_Reference#SkMatrix' > SkMatrix< / a > to < a href = 'SkMatrix_Reference#SkMatrix' > SkMatrix< / a > < a href = '#SkMatrix_postConcat_other' > other< / a > multiplied by < a href = 'SkMatrix_Reference#SkMatrix' > SkMatrix< / a > .
This can be thought of mapping by < a href = '#SkMatrix_postConcat_other' > other< / a > after applying < a href = 'SkMatrix_Reference#SkMatrix' > SkMatrix< / a > .
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Given:
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| J K L | | A B C |
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< a href = 'SkMatrix_Reference#Matrix' > Matrix< / a > = | M N O |, < a href = '#SkMatrix_postConcat_other' > other< / a > = | D E F |
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| P Q R | | G H < a href = '#SkMatrix_I' > I< / a > |
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sets < a href = 'SkMatrix_Reference#SkMatrix' > SkMatrix< / a > to:
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| A B C | | J K L | | AJ+BM+CP AK+BN+CQ AL+BO+CR |
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< a href = '#SkMatrix_postConcat_other' > other</ a > * <a href='SkMatrix_Reference#Matrix'>Matrix</a> = | D E F | * | M N O | = | DJ+EM+FP DK+EN+FQ DL+EO+FR |
| G H < a href = '#SkMatrix_I' > I< / a > | | P Q R | | GJ+HM+IP GK+HN+IQ GL+HO+IR |
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### Parameters
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< table > < tr > < td > < a name = 'SkMatrix_postConcat_other' > < code > < strong > other< / strong > < / code > < / a > < / td >
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< td > < a href = 'SkMatrix_Reference#SkMatrix' > SkMatrix< / a > on left side of multiply expression< / td >
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< / tr >
< / table >
### Example
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< div > < fiddle-embed name = "@Matrix_postConcat" > < / fiddle-embed > < / div >
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### See Also
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< a href = '#SkMatrix_preConcat' > preConcat< / a > < a href = '#SkMatrix_setConcat' > setConcat< / a > < a href = '#SkMatrix_Concat' > Concat< / a >
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< a name = 'SkMatrix_ScaleToFit' > < / a >
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---
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2017-11-27 15:44:06 +00:00
< pre style = "padding: 1em 1em 1em 1em;width: 62.5em; background-color: #f0f0f0 " >
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enum < a href = '#SkMatrix_ScaleToFit' > ScaleToFit< / a > {
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< a href = '#SkMatrix_kFill_ScaleToFit' > kFill_ScaleToFit< / a > ,
< a href = '#SkMatrix_kStart_ScaleToFit' > kStart_ScaleToFit< / a > ,
< a href = '#SkMatrix_kCenter_ScaleToFit' > kCenter_ScaleToFit< / a > ,
< a href = '#SkMatrix_kEnd_ScaleToFit' > kEnd_ScaleToFit< / a > ,
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};
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< / pre >
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2018-11-09 21:04:58 +00:00
< a href = '#SkMatrix_ScaleToFit' > ScaleToFit< / a > describes how < a href = 'SkMatrix_Reference#Matrix' > Matrix< / a > is constructed to map one < a href = 'SkRect_Reference#Rect' > Rect< / a > to another.
< a href = '#SkMatrix_ScaleToFit' > ScaleToFit< / a > may allow < a href = 'SkMatrix_Reference#Matrix' > Matrix< / a > to have unequal horizontal and vertical scaling,
or may restrict < a href = 'SkMatrix_Reference#Matrix' > Matrix< / a > to square scaling. If restricted, < a href = '#SkMatrix_ScaleToFit' > ScaleToFit< / a > specifies
how < a href = 'SkMatrix_Reference#Matrix' > Matrix< / a > maps to the side or center of the destination < a href = 'SkRect_Reference#Rect' > Rect< / a > .
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### Constants
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< table style = 'border-collapse: collapse; width: 62.5em' >
< tr >< th style = 'text-align: left; border: 2px solid #dddddd ; padding: 8px; ' > Const</ th >
< th style = 'text-align: center; border: 2px solid #dddddd ; padding: 8px; ' > Value</ th >
< th style = 'text-align: left; border: 2px solid #dddddd ; padding: 8px; ' > Description</ th ></ tr >
< tr style = 'background-color: #f0f0f0 ; ' >
< td style = 'text-align: left; border: 2px solid #dddddd ; padding: 8px; ' >< a name = 'SkMatrix_kFill_ScaleToFit' >< code > SkMatrix::kFill_ScaleToFit</ code ></ a ></ td >
< td style = 'text-align: center; border: 2px solid #dddddd ; padding: 8px; ' > 0</ td >
< td style = 'text-align: left; border: 2px solid #dddddd ; padding: 8px; ' >
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Computes < a href = 'SkMatrix_Reference#Matrix' > Matrix< / a > that scales about x-axis and y-axis independently, so that
source < a href = 'SkRect_Reference#Rect' > Rect< / a > is mapped to completely fill destination < a href = 'SkRect_Reference#Rect' > Rect< / a > . The aspect ratio
of source < a href = 'SkRect_Reference#Rect' > Rect< / a > may change.
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< / td >
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< / tr >
< tr >
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< td style = 'text-align: left; border: 2px solid #dddddd ; padding: 8px; ' >< a name = 'SkMatrix_kStart_ScaleToFit' >< code > SkMatrix::kStart_ScaleToFit</ code ></ a ></ td >
< td style = 'text-align: center; border: 2px solid #dddddd ; padding: 8px; ' > 1</ td >
< td style = 'text-align: left; border: 2px solid #dddddd ; padding: 8px; ' >
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Computes < a href = 'SkMatrix_Reference#Matrix' > Matrix< / a > that maintains source < a href = 'SkRect_Reference#Rect' > Rect< / a > aspect ratio, mapping source < a href = 'SkRect_Reference#Rect' > Rect< / a >
width or height to destination < a href = 'SkRect_Reference#Rect' > Rect< / a > . Aligns mapping to left and top edges
of destination < a href = 'SkRect_Reference#Rect' > Rect< / a > .
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< / td >
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< / tr >
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< tr style = 'background-color: #f0f0f0 ; ' >
< td style = 'text-align: left; border: 2px solid #dddddd ; padding: 8px; ' >< a name = 'SkMatrix_kCenter_ScaleToFit' >< code > SkMatrix::kCenter_ScaleToFit</ code ></ a ></ td >
< td style = 'text-align: center; border: 2px solid #dddddd ; padding: 8px; ' > 2</ td >
< td style = 'text-align: left; border: 2px solid #dddddd ; padding: 8px; ' >
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Computes < a href = 'SkMatrix_Reference#Matrix' > Matrix< / a > that maintains source < a href = 'SkRect_Reference#Rect' > Rect< / a > aspect ratio, mapping source < a href = 'SkRect_Reference#Rect' > Rect< / a >
width or height to destination < a href = 'SkRect_Reference#Rect' > Rect< / a > . Aligns mapping to center of destination
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< a href = 'SkRect_Reference#Rect' > Rect< / a > .
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< / td >
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< / tr >
< tr >
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< td style = 'text-align: left; border: 2px solid #dddddd ; padding: 8px; ' >< a name = 'SkMatrix_kEnd_ScaleToFit' >< code > SkMatrix::kEnd_ScaleToFit</ code ></ a ></ td >
< td style = 'text-align: center; border: 2px solid #dddddd ; padding: 8px; ' > 3</ td >
< td style = 'text-align: left; border: 2px solid #dddddd ; padding: 8px; ' >
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Computes < a href = 'SkMatrix_Reference#Matrix' > Matrix< / a > that maintains source < a href = 'SkRect_Reference#Rect' > Rect< / a > aspect ratio, mapping source < a href = 'SkRect_Reference#Rect' > Rect< / a >
width or height to destination < a href = 'SkRect_Reference#Rect' > Rect< / a > . Aligns mapping to right and bottom
edges of destination < a href = 'SkRect_Reference#Rect' > Rect< / a > .
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< / td >
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< / tr >
< / table >
### Example
< div > < fiddle-embed name = "17c3070b31b700ea8f52e48af9a66b6e" > < / fiddle-embed > < / div >
### See Also
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< a href = '#SkMatrix_setRectToRect' > setRectToRect< / a > < a href = '#SkMatrix_MakeRectToRect' > MakeRectToRect< / a > < a href = '#SkMatrix_setPolyToPoly' > setPolyToPoly< / a >
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< a name = 'SkMatrix_setRectToRect' > < / a >
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---
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< pre style = "padding: 1em 1em 1em 1em; width: 62.5em;background-color: #f0f0f0 " >
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bool < a href = '#SkMatrix_setRectToRect' > setRectToRect< / a > (const < a href = 'SkRect_Reference#SkRect' > SkRect< / a > & src, const < a href = 'SkRect_Reference#SkRect' > SkRect< / a > & dst, < a href = '#SkMatrix_ScaleToFit' > ScaleToFit< / a > stf)
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< / pre >
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Sets < a href = 'SkMatrix_Reference#SkMatrix' > SkMatrix< / a > to scale and translate < a href = '#SkMatrix_setRectToRect_src' > src< / a > < a href = 'SkRect_Reference#SkRect' > SkRect< / a > to < a href = '#SkMatrix_setRectToRect_dst' > dst< / a > < a href = 'SkRect_Reference#SkRect' > SkRect< / a > . < a href = '#SkMatrix_setRectToRect_stf' > stf< / a > selects whether
mapping completely fills < a href = '#SkMatrix_setRectToRect_dst' > dst< / a > or preserves the aspect ratio, and how to align
< a href = '#SkMatrix_setRectToRect_src' > src< / a > within < a href = '#SkMatrix_setRectToRect_dst' > dst< / a > . Returns false if < a href = '#SkMatrix_setRectToRect_src' > src< / a > is empty, and sets < a href = 'SkMatrix_Reference#SkMatrix' > SkMatrix< / a > to identity.
Returns true if < a href = '#SkMatrix_setRectToRect_dst' > dst< / a > is empty, and sets < a href = 'SkMatrix_Reference#SkMatrix' > SkMatrix< / a > to:
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| 0 0 0 |
| 0 0 0 |
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| 0 0 1 |
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### Parameters
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< table > < tr > < td > < a name = 'SkMatrix_setRectToRect_src' > < code > < strong > src< / strong > < / code > < / a > < / td >
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< td > < a href = 'SkRect_Reference#SkRect' > SkRect< / a > to map from< / td >
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< / tr >
< tr > < td > < a name = 'SkMatrix_setRectToRect_dst' > < code > < strong > dst< / strong > < / code > < / a > < / td >
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< td > < a href = 'SkRect_Reference#SkRect' > SkRect< / a > to map to< / td >
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< / tr >
< tr > < td > < a name = 'SkMatrix_setRectToRect_stf' > < code > < strong > stf< / strong > < / code > < / a > < / td >
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< td > one of: < a href = '#SkMatrix_kFill_ScaleToFit' > kFill_ScaleToFit< / a > , < a href = '#SkMatrix_kStart_ScaleToFit' > kStart_ScaleToFit< / a > ,< / td >
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< / tr >
< / table >
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< a href = '#SkMatrix_kCenter_ScaleToFit' > kCenter_ScaleToFit< / a > , < a href = '#SkMatrix_kEnd_ScaleToFit' > kEnd_ScaleToFit< / a >
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### Return Value
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true if < a href = 'SkMatrix_Reference#SkMatrix' > SkMatrix< / a > can represent < a href = 'SkRect_Reference#SkRect' > SkRect< / a > mapping
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### Example
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< div > < fiddle-embed name = "@Matrix_setRectToRect" >
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#### Example Output
~~~~
src: 0, 0, 0, 0 dst: 0, 0, 0, 0 success: false
[ 1.0000 0.0000 0.0000][ 0.0000 1.0000 0.0000][ 0.0000 0.0000 1.0000]
src: 0, 0, 0, 0 dst: 5, 6, 8, 9 success: false
[ 1.0000 0.0000 0.0000][ 0.0000 1.0000 0.0000][ 0.0000 0.0000 1.0000]
src: 1, 2, 3, 4 dst: 0, 0, 0, 0 success: true
[ 0.0000 0.0000 0.0000][ 0.0000 0.0000 0.0000][ 0.0000 0.0000 1.0000]
src: 1, 2, 3, 4 dst: 5, 6, 8, 9 success: true
[ 1.5000 0.0000 3.5000][ 0.0000 1.5000 3.0000][ 0.0000 0.0000 1.0000]
~~~~
< / fiddle-embed > < / div >
### See Also
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< a href = '#SkMatrix_MakeRectToRect' > MakeRectToRect< / a > < a href = '#SkMatrix_ScaleToFit' > ScaleToFit< / a > < a href = '#SkMatrix_setPolyToPoly' > setPolyToPoly< / a > < a href = 'SkRect_Reference#SkRect' > SkRect< / a > ::< a href = '#SkRect_isEmpty' > isEmpty< / a >
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< a name = 'SkMatrix_MakeRectToRect' > < / a >
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---
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< pre style = "padding: 1em 1em 1em 1em; width: 62.5em;background-color: #f0f0f0 " >
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static < a href = 'SkMatrix_Reference#SkMatrix' > SkMatrix< / a > < a href = '#SkMatrix_MakeRectToRect' > MakeRectToRect< / a > (const < a href = 'SkRect_Reference#SkRect' > SkRect< / a > & src, const < a href = 'SkRect_Reference#SkRect' > SkRect< / a > & dst, < a href = '#SkMatrix_ScaleToFit' > ScaleToFit< / a > stf)
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< / pre >
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Returns < a href = 'SkMatrix_Reference#SkMatrix' > SkMatrix< / a > set to scale and translate < a href = '#SkMatrix_MakeRectToRect_src' > src< / a > < a href = 'SkRect_Reference#SkRect' > SkRect< / a > to < a href = '#SkMatrix_MakeRectToRect_dst' > dst< / a > < a href = 'SkRect_Reference#SkRect' > SkRect< / a > . < a href = '#SkMatrix_MakeRectToRect_stf' > stf< / a > selects
whether mapping completely fills < a href = '#SkMatrix_MakeRectToRect_dst' > dst< / a > or preserves the aspect ratio, and how to
align < a href = '#SkMatrix_MakeRectToRect_src' > src< / a > within < a href = '#SkMatrix_MakeRectToRect_dst' > dst< / a > . Returns the identity < a href = 'SkMatrix_Reference#SkMatrix' > SkMatrix< / a > if < a href = '#SkMatrix_MakeRectToRect_src' > src< / a > is empty. If < a href = '#SkMatrix_MakeRectToRect_dst' > dst< / a > is
empty, returns < a href = 'SkMatrix_Reference#SkMatrix' > SkMatrix< / a > set to:
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| 0 0 0 |
| 0 0 0 |
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| 0 0 1 |
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### Parameters
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< table > < tr > < td > < a name = 'SkMatrix_MakeRectToRect_src' > < code > < strong > src< / strong > < / code > < / a > < / td >
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< td > < a href = 'SkRect_Reference#SkRect' > SkRect< / a > to map from< / td >
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< / tr >
< tr > < td > < a name = 'SkMatrix_MakeRectToRect_dst' > < code > < strong > dst< / strong > < / code > < / a > < / td >
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< td > < a href = 'SkRect_Reference#SkRect' > SkRect< / a > to map to< / td >
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< / tr >
< tr > < td > < a name = 'SkMatrix_MakeRectToRect_stf' > < code > < strong > stf< / strong > < / code > < / a > < / td >
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< td > one of: < a href = '#SkMatrix_kFill_ScaleToFit' > kFill_ScaleToFit< / a > , < a href = '#SkMatrix_kStart_ScaleToFit' > kStart_ScaleToFit< / a > ,< / td >
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< / tr >
< / table >
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< a href = '#SkMatrix_kCenter_ScaleToFit' > kCenter_ScaleToFit< / a > , < a href = '#SkMatrix_kEnd_ScaleToFit' > kEnd_ScaleToFit< / a >
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### Return Value
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< a href = 'SkMatrix_Reference#SkMatrix' > SkMatrix< / a > mapping < a href = '#SkMatrix_MakeRectToRect_src' > src< / a > to < a href = '#SkMatrix_MakeRectToRect_dst' > dst< / a >
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### Example
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< div > < fiddle-embed name = "@Matrix_MakeRectToRect" >
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#### Example Output
~~~~
src: 0, 0, 0, 0 dst: 0, 0, 0, 0
[ 1.0000 0.0000 0.0000][ 0.0000 1.0000 0.0000][ 0.0000 0.0000 1.0000]
src: 0, 0, 0, 0 dst: 5, 6, 8, 9
[ 1.0000 0.0000 0.0000][ 0.0000 1.0000 0.0000][ 0.0000 0.0000 1.0000]
src: 1, 2, 3, 4 dst: 0, 0, 0, 0
[ 0.0000 0.0000 0.0000][ 0.0000 0.0000 0.0000][ 0.0000 0.0000 1.0000]
src: 1, 2, 3, 4 dst: 5, 6, 8, 9
[ 1.5000 0.0000 3.5000][ 0.0000 1.5000 3.0000][ 0.0000 0.0000 1.0000]
~~~~
< / fiddle-embed > < / div >
### See Also
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< a href = '#SkMatrix_setRectToRect' > setRectToRect< / a > < a href = '#SkMatrix_ScaleToFit' > ScaleToFit< / a > < a href = '#SkMatrix_setPolyToPoly' > setPolyToPoly< / a > < a href = 'SkRect_Reference#SkRect' > SkRect< / a > ::< a href = '#SkRect_isEmpty' > isEmpty< / a >
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< a name = 'SkMatrix_setPolyToPoly' > < / a >
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---
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< pre style = "padding: 1em 1em 1em 1em; width: 62.5em;background-color: #f0f0f0 " >
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bool < a href = '#SkMatrix_setPolyToPoly' > setPolyToPoly< / a > (const < a href = 'SkPoint_Reference#SkPoint' > SkPoint< / a > src[], const < a href = 'SkPoint_Reference#SkPoint' > SkPoint< / a > dst[], int count)
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< / pre >
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Sets < a href = 'SkMatrix_Reference#SkMatrix' > SkMatrix< / a > to map < a href = '#SkMatrix_setPolyToPoly_src' > src< / a > to < a href = '#SkMatrix_setPolyToPoly_dst' > dst< / a > . < a href = '#SkMatrix_setPolyToPoly_count' > count< / a > must be zero or greater, and four or less.
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If < a href = '#SkMatrix_setPolyToPoly_count' > count< / a > is zero, sets < a href = 'SkMatrix_Reference#SkMatrix' > SkMatrix< / a > to identity and returns true.
If < a href = '#SkMatrix_setPolyToPoly_count' > count< / a > is one, sets < a href = 'SkMatrix_Reference#SkMatrix' > SkMatrix< / a > to translate and returns true.
If < a href = '#SkMatrix_setPolyToPoly_count' > count< / a > is two or more, sets < a href = 'SkMatrix_Reference#SkMatrix' > SkMatrix< / a > to map < a href = 'SkPoint_Reference#SkPoint' > SkPoint< / a > if possible; returns false
if < a href = 'SkMatrix_Reference#SkMatrix' > SkMatrix< / a > cannot be constructed. If < a href = '#SkMatrix_setPolyToPoly_count' > count< / a > is four, < a href = 'SkMatrix_Reference#SkMatrix' > SkMatrix< / a > may include
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perspective.
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### Parameters
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< table > < tr > < td > < a name = 'SkMatrix_setPolyToPoly_src' > < code > < strong > src< / strong > < / code > < / a > < / td >
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< td > < a href = 'SkPoint_Reference#SkPoint' > SkPoint< / a > to map from< / td >
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< / tr >
< tr > < td > < a name = 'SkMatrix_setPolyToPoly_dst' > < code > < strong > dst< / strong > < / code > < / a > < / td >
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< td > < a href = 'SkPoint_Reference#SkPoint' > SkPoint< / a > to map to< / td >
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< / tr >
< tr > < td > < a name = 'SkMatrix_setPolyToPoly_count' > < code > < strong > count< / strong > < / code > < / a > < / td >
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< td > number of < a href = 'SkPoint_Reference#SkPoint' > SkPoint< / a > in < a href = '#SkMatrix_setPolyToPoly_src' > src< / a > and < a href = '#SkMatrix_setPolyToPoly_dst' > dst< / a > < / td >
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< / tr >
< / table >
### Return Value
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true if < a href = 'SkMatrix_Reference#SkMatrix' > SkMatrix< / a > was constructed successfully
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### Example
< div > < fiddle-embed name = "c851d1313e8909aaea4f0591699fdb7b" > < / fiddle-embed > < / div >
### See Also
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< a href = '#SkMatrix_setRectToRect' > setRectToRect< / a > < a href = '#SkMatrix_MakeRectToRect' > MakeRectToRect< / a >
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< a name = 'SkMatrix_invert' > < / a >
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---
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< pre style = "padding: 1em 1em 1em 1em; width: 62.5em;background-color: #f0f0f0 " >
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bool < a href = '#SkMatrix_invert' > invert< / a > (< a href = 'SkMatrix_Reference#SkMatrix' > SkMatrix< / a > * inverse)const
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< / pre >
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Sets < a href = '#SkMatrix_invert_inverse' > inverse< / a > to reciprocal < a href = 'SkMatrix_Reference#Matrix' > matrix< / a > , returning true if < a href = 'SkMatrix_Reference#SkMatrix' > SkMatrix< / a > can be inverted.
Geometrically, if < a href = 'SkMatrix_Reference#SkMatrix' > SkMatrix< / a > maps from source to destination, < a href = '#SkMatrix_invert_inverse' > inverse< / a > < a href = 'SkMatrix_Reference#SkMatrix' > SkMatrix< / a >
maps from destination to source. If < a href = 'SkMatrix_Reference#SkMatrix' > SkMatrix< / a > can not be inverted, < a href = '#SkMatrix_invert_inverse' > inverse< / a > is
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unchanged.
### Parameters
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< table > < tr > < td > < a name = 'SkMatrix_invert_inverse' > < code > < strong > inverse< / strong > < / code > < / a > < / td >
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< td > storage for inverted < a href = 'SkMatrix_Reference#SkMatrix' > SkMatrix< / a > ; may be nullptr< / td >
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< / tr >
< / table >
### Return Value
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true if < a href = 'SkMatrix_Reference#SkMatrix' > SkMatrix< / a > can be inverted
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### Example
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< div > < fiddle-embed name = "@Matrix_invert" > < / fiddle-embed > < / div >
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### See Also
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< a href = '#SkMatrix_Concat' > Concat< / a >
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< a name = 'SkMatrix_SetAffineIdentity' > < / a >
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---
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< pre style = "padding: 1em 1em 1em 1em; width: 62.5em;background-color: #f0f0f0 " >
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static void < a href = '#SkMatrix_SetAffineIdentity' > SetAffineIdentity< / a > (< a href = 'undocumented#SkScalar' > SkScalar< / a > affine[6])
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< / pre >
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Fills < a href = '#SkMatrix_SetAffineIdentity_affine' > affine< / a > with identity values in column major order.
Sets < a href = '#SkMatrix_SetAffineIdentity_affine' > affine< / a > to:
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| 1 0 0 |
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| 0 1 0 |
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Affine 3 by 2 < a href = 'SkMatrix_Reference#Matrix' > matrices< / a > in column major order are used by OpenGL and XPS.
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### Parameters
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< table > < tr > < td > < a name = 'SkMatrix_SetAffineIdentity_affine' > < code > < strong > affine< / strong > < / code > < / a > < / td >
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< td > storage for 3 by 2 < a href = '#SkMatrix_SetAffineIdentity_affine' > affine< / a > < a href = 'SkMatrix_Reference#Matrix' > matrix< / a > < / td >
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< / tr >
< / table >
### Example
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< div > < fiddle-embed name = "@Matrix_SetAffineIdentity" >
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#### Example Output
~~~~
ScaleX: 1 SkewY: 0 SkewX: 0 ScaleY: 1 TransX: 0 TransY: 0
~~~~
< / fiddle-embed > < / div >
### See Also
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< a href = '#SkMatrix_setAffine' > setAffine< / a > < a href = '#SkMatrix_asAffine' > asAffine< / a >
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< a name = 'SkMatrix_asAffine' > < / a >
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---
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< pre style = "padding: 1em 1em 1em 1em; width: 62.5em;background-color: #f0f0f0 " >
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bool < a href = '#SkMatrix_asAffine' > asAffine< / a > (< a href = 'undocumented#SkScalar' > SkScalar< / a > affine[6])const
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< / pre >
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Fills < a href = '#SkMatrix_asAffine_affine' > affine< / a > in column major order. Sets < a href = '#SkMatrix_asAffine_affine' > affine< / a > to:
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| scale-x skew-x translate-x |
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| skew-y scale-y translate-y |
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If < a href = 'SkMatrix_Reference#SkMatrix' > SkMatrix< / a > contains perspective, returns false and leaves < a href = '#SkMatrix_asAffine_affine' > affine< / a > unchanged.
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### Parameters
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< table > < tr > < td > < a name = 'SkMatrix_asAffine_affine' > < code > < strong > affine< / strong > < / code > < / a > < / td >
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< td > storage for 3 by 2 < a href = '#SkMatrix_asAffine_affine' > affine< / a > < a href = 'SkMatrix_Reference#Matrix' > matrix< / a > ; may be nullptr< / td >
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< / tr >
< / table >
### Return Value
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true if < a href = 'SkMatrix_Reference#SkMatrix' > SkMatrix< / a > does not contain perspective
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### Example
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< div > < fiddle-embed name = "@Matrix_asAffine" >
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#### Example Output
~~~~
ScaleX: 2 SkewY: 5 SkewX: 3 ScaleY: 6 TransX: 4 TransY: 7
~~~~
< / fiddle-embed > < / div >
### See Also
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< a href = '#SkMatrix_setAffine' > setAffine< / a > < a href = '#SkMatrix_SetAffineIdentity' > SetAffineIdentity< / a >
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< a name = 'SkMatrix_setAffine' > < / a >
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---
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< pre style = "padding: 1em 1em 1em 1em; width: 62.5em;background-color: #f0f0f0 " >
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void < a href = '#SkMatrix_setAffine' > setAffine< / a > (const < a href = 'undocumented#SkScalar' > SkScalar< / a > affine[6])
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< / pre >
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Sets < a href = 'SkMatrix_Reference#SkMatrix' > SkMatrix< / a > to < a href = '#SkMatrix_setAffine_affine' > affine< / a > values, passed in column major order. Given < a href = '#SkMatrix_setAffine_affine' > affine< / a > ,
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column, then row, as:
| scale-x skew-x translate-x |
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| skew-y scale-y translate-y |
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< a href = 'SkMatrix_Reference#SkMatrix' > SkMatrix< / a > is set, row, then column, to:
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| scale-x skew-x translate-x |
| skew-y scale-y translate-y |
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| 0 0 1 |
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### Parameters
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< table > < tr > < td > < a name = 'SkMatrix_setAffine_affine' > < code > < strong > affine< / strong > < / code > < / a > < / td >
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< td > 3 by 2 < a href = '#SkMatrix_setAffine_affine' > affine< / a > < a href = 'SkMatrix_Reference#Matrix' > matrix< / a > < / td >
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< / tr >
< / table >
### Example
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< div > < fiddle-embed name = "@Matrix_setAffine" >
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#### Example Output
~~~~
ScaleX: 2 SkewY: 5 SkewX: 3 ScaleY: 6 TransX: 4 TransY: 7
[ 2.0000 3.0000 4.0000][ 5.0000 6.0000 7.0000][ 0.0000 0.0000 1.0000]
~~~~
< / fiddle-embed > < / div >
### See Also
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< a href = '#SkMatrix_asAffine' > asAffine< / a > < a href = '#SkMatrix_SetAffineIdentity' > SetAffineIdentity< / a >
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< a name = 'Transform' > < / a >
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< a name = 'SkMatrix_mapPoints' > < / a >
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---
2017-10-26 11:58:48 +00:00
2018-05-16 11:07:07 +00:00
< pre style = "padding: 1em 1em 1em 1em; width: 62.5em;background-color: #f0f0f0 " >
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void < a href = '#SkMatrix_mapPoints' > mapPoints< / a > (< a href = 'SkPoint_Reference#SkPoint' > SkPoint< / a > dst[], const < a href = 'SkPoint_Reference#SkPoint' > SkPoint< / a > src[], int count)const
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< / pre >
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Maps < a href = '#SkMatrix_mapPoints_src' > src< / a > < a href = 'SkPath_Reference#Point_Array' > SkPoint array< / a > of length < a href = '#SkMatrix_mapPoints_count' > count< / a > to < a href = '#SkMatrix_mapPoints_dst' > dst< / a > < a href = 'SkPath_Reference#Point_Array' > SkPoint array< / a > of equal or greater
length. < a href = 'SkPoint_Reference#SkPoint' > SkPoint< / a > are mapped by multiplying each < a href = 'SkPoint_Reference#SkPoint' > SkPoint< / a > by < a href = 'SkMatrix_Reference#SkMatrix' > SkMatrix< / a > . Given:
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| A B C | | x |
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< a href = 'SkMatrix_Reference#Matrix' > Matrix< / a > = | D E F |, pt = | y |
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| G H < a href = '#SkMatrix_I' > I< / a > | | 1 |
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where
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for (i = 0; i < < a href = '#SkMatrix_mapPoints_count' > count< / a > ; ++i) {
x = < a href = '#SkMatrix_mapPoints_src' > src< / a > [i].fX
y = < a href = '#SkMatrix_mapPoints_src' > src< / a > [i].fY
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}
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each < a href = '#SkMatrix_mapPoints_dst' > dst< / a > < a href = 'SkPoint_Reference#SkPoint' > SkPoint< / a > is computed as:
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|A B C| |x| Ax+By+C Dx+Ey+F
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< a href = 'SkMatrix_Reference#Matrix' > Matrix< / a > * pt = |D E F| |y| = |Ax+By+C Dx+Ey+F Gx+Hy+< a href = '#SkMatrix_I' > I< / a > | = ------- , -------
|G H < a href = '#SkMatrix_I' > I< / a > | |1| Gx+Hy+< a href = '#SkMatrix_I' > I< / a > Gx+Hy+< a href = '#SkMatrix_I' > I< / a >
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< a href = '#SkMatrix_mapPoints_src' > src< / a > and < a href = '#SkMatrix_mapPoints_dst' > dst< / a > may < a href = 'SkPoint_Reference#Point' > point< / a > to the same storage.
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### Parameters
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< table > < tr > < td > < a name = 'SkMatrix_mapPoints_dst' > < code > < strong > dst< / strong > < / code > < / a > < / td >
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< td > storage for mapped < a href = 'SkPoint_Reference#SkPoint' > SkPoint< / a > < / td >
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< / tr >
< tr > < td > < a name = 'SkMatrix_mapPoints_src' > < code > < strong > src< / strong > < / code > < / a > < / td >
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< td > < a href = 'SkPoint_Reference#SkPoint' > SkPoint< / a > to transform< / td >
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< / tr >
< tr > < td > < a name = 'SkMatrix_mapPoints_count' > < code > < strong > count< / strong > < / code > < / a > < / td >
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< td > number of < a href = 'SkPoint_Reference#SkPoint' > SkPoint< / a > to transform< / td >
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< / tr >
< / table >
### Example
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< div > < fiddle-embed name = "@Matrix_mapPoints" > < / fiddle-embed > < / div >
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### See Also
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< a href = '#SkMatrix_mapXY' > mapXY< / a > < a href = '#SkMatrix_mapHomogeneousPoints' > mapHomogeneousPoints< / a > < a href = '#SkMatrix_mapVectors' > mapVectors< / a >
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< a name = 'SkMatrix_mapPoints_2' > < / a >
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2018-10-16 14:30:28 +00:00
---
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< pre style = "padding: 1em 1em 1em 1em; width: 62.5em;background-color: #f0f0f0 " >
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void < a href = '#SkMatrix_mapPoints' > mapPoints< / a > (< a href = 'SkPoint_Reference#SkPoint' > SkPoint< / a > pts[], int count)const
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< / pre >
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Maps < a href = '#SkMatrix_mapPoints_2_pts' > pts< / a > < a href = 'SkPath_Reference#Point_Array' > SkPoint array< / a > of length < a href = '#SkMatrix_mapPoints_2_count' > count< / a > in place. < a href = 'SkPoint_Reference#SkPoint' > SkPoint< / a > are mapped by multiplying
each < a href = 'SkPoint_Reference#SkPoint' > SkPoint< / a > by < a href = 'SkMatrix_Reference#SkMatrix' > SkMatrix< / a > . Given:
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| A B C | | x |
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< a href = 'SkMatrix_Reference#Matrix' > Matrix< / a > = | D E F |, pt = | y |
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| G H < a href = '#SkMatrix_I' > I< / a > | | 1 |
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where
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for (i = 0; i < < a href = '#SkMatrix_mapPoints_2_count' > count< / a > ; ++i) {
x = < a href = '#SkMatrix_mapPoints_2_pts' > pts< / a > [i].fX
y = < a href = '#SkMatrix_mapPoints_2_pts' > pts< / a > [i].fY
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}
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each resulting < a href = '#SkMatrix_mapPoints_2_pts' > pts< / a > < a href = 'SkPoint_Reference#SkPoint' > SkPoint< / a > is computed as:
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|A B C| |x| Ax+By+C Dx+Ey+F
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< a href = 'SkMatrix_Reference#Matrix' > Matrix< / a > * pt = |D E F| |y| = |Ax+By+C Dx+Ey+F Gx+Hy+< a href = '#SkMatrix_I' > I< / a > | = ------- , -------
|G H < a href = '#SkMatrix_I' > I< / a > | |1| Gx+Hy+< a href = '#SkMatrix_I' > I< / a > Gx+Hy+< a href = '#SkMatrix_I' > I< / a >
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### Parameters
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< table > < tr > < td > < a name = 'SkMatrix_mapPoints_2_pts' > < code > < strong > pts< / strong > < / code > < / a > < / td >
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< td > storage for mapped < a href = 'SkPoint_Reference#SkPoint' > SkPoint< / a > < / td >
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< / tr >
< tr > < td > < a name = 'SkMatrix_mapPoints_2_count' > < code > < strong > count< / strong > < / code > < / a > < / td >
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< td > number of < a href = 'SkPoint_Reference#SkPoint' > SkPoint< / a > to transform< / td >
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< / tr >
< / table >
### Example
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< div > < fiddle-embed name = "@Matrix_mapPoints_2" > < / fiddle-embed > < / div >
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### See Also
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< a href = '#SkMatrix_mapXY' > mapXY< / a > < a href = '#SkMatrix_mapHomogeneousPoints' > mapHomogeneousPoints< / a > < a href = '#SkMatrix_mapVectors' > mapVectors< / a >
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< a name = 'SkMatrix_mapHomogeneousPoints' > < / a >
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---
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< pre style = "padding: 1em 1em 1em 1em; width: 62.5em;background-color: #f0f0f0 " >
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void < a href = '#SkMatrix_mapHomogeneousPoints' > mapHomogeneousPoints< / a > (< a href = 'undocumented#SkPoint3' > SkPoint3< / a > dst[], const < a href = 'undocumented#SkPoint3' > SkPoint3< / a > src[], int count)const
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< / pre >
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Maps < a href = '#SkMatrix_mapHomogeneousPoints_src' > src< / a > < a href = 'undocumented#SkPoint3' > SkPoint3< / a > array of length < a href = '#SkMatrix_mapHomogeneousPoints_count' > count< / a > to < a href = '#SkMatrix_mapHomogeneousPoints_dst' > dst< / a > < a href = 'undocumented#SkPoint3' > SkPoint3< / a > array, which must of length < a href = '#SkMatrix_mapHomogeneousPoints_count' > count< / a > or
greater. < a href = 'undocumented#SkPoint3' > SkPoint3< / a > array is mapped by multiplying each < a href = 'undocumented#SkPoint3' > SkPoint3< / a > by < a href = 'SkMatrix_Reference#SkMatrix' > SkMatrix< / a > . Given:
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| A B C | | x |
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< a href = 'SkMatrix_Reference#Matrix' > Matrix< / a > = | D E F |, < a href = '#SkMatrix_mapHomogeneousPoints_src' > src< / a > = | y |
| G H < a href = '#SkMatrix_I' > I< / a > | | z |
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each resulting < a href = '#SkMatrix_mapHomogeneousPoints_dst' > dst< / a > < a href = 'SkPoint_Reference#SkPoint' > SkPoint< / a > is computed as:
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|A B C| |x|
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< a href = 'SkMatrix_Reference#Matrix' > Matrix< / a > * < a href = '#SkMatrix_mapHomogeneousPoints_src' > src< / a > = |D E F| |y| = |Ax+By+Cz Dx+Ey+Fz Gx+Hy+Iz|
|G H < a href = '#SkMatrix_I' > I< / a > | |z|
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### Parameters
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< table > < tr > < td > < a name = 'SkMatrix_mapHomogeneousPoints_dst' > < code > < strong > dst< / strong > < / code > < / a > < / td >
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< td > storage for mapped < a href = 'undocumented#SkPoint3' > SkPoint3< / a > array< / td >
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< / tr >
< tr > < td > < a name = 'SkMatrix_mapHomogeneousPoints_src' > < code > < strong > src< / strong > < / code > < / a > < / td >
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< td > < a href = 'undocumented#SkPoint3' > SkPoint3< / a > array to transform< / td >
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< / tr >
< tr > < td > < a name = 'SkMatrix_mapHomogeneousPoints_count' > < code > < strong > count< / strong > < / code > < / a > < / td >
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< td > items in < a href = 'undocumented#SkPoint3' > SkPoint3< / a > array to transform< / td >
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< / tr >
< / table >
### Example
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< div > < fiddle-embed name = "@Matrix_mapHomogeneousPoints" > < / fiddle-embed > < / div >
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### See Also
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< a href = '#SkMatrix_mapPoints' > mapPoints< / a > < a href = '#SkMatrix_mapXY' > mapXY< / a > < a href = '#SkMatrix_mapVectors' > mapVectors< / a >
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2018-05-16 11:07:07 +00:00
< a name = 'SkMatrix_mapXY' > < / a >
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---
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2018-05-16 11:07:07 +00:00
< pre style = "padding: 1em 1em 1em 1em; width: 62.5em;background-color: #f0f0f0 " >
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void < a href = '#SkMatrix_mapXY' > mapXY< / a > (< a href = 'undocumented#SkScalar' > SkScalar< / a > x, < a href = 'undocumented#SkScalar' > SkScalar< / a > y, < a href = 'SkPoint_Reference#SkPoint' > SkPoint< / a > * result)const
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< / pre >
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Maps < a href = 'SkPoint_Reference#SkPoint' > SkPoint< / a > (< a href = '#SkMatrix_mapXY_x' > x< / a > , < a href = '#SkMatrix_mapXY_y' > y< / a > ) to < a href = '#SkMatrix_mapXY_result' > result< / a > . < a href = 'SkPoint_Reference#SkPoint' > SkPoint< / a > is mapped by multiplying by < a href = 'SkMatrix_Reference#SkMatrix' > SkMatrix< / a > . Given:
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| A B C | | < a href = '#SkMatrix_mapXY_x' > x< / a > |
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< a href = 'SkMatrix_Reference#Matrix' > Matrix< / a > = | D E F |, pt = | < a href = '#SkMatrix_mapXY_y' > y< / a > |
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| G H < a href = '#SkMatrix_I' > I< / a > | | 1 |
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< a href = '#SkMatrix_mapXY_result' > result< / a > is computed as:
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|A B C| |< a href = '#SkMatrix_mapXY_x' > x< / a > | Ax+By+C Dx+Ey+F
< a href = 'SkMatrix_Reference#Matrix' > Matrix< / a > * pt = |D E F| |< a href = '#SkMatrix_mapXY_y' > y< / a > | = |Ax+By+C Dx+Ey+F Gx+Hy+< a href = '#SkMatrix_I' > I< / a > | = ------- , -------
|G H < a href = '#SkMatrix_I' > I< / a > | |1| Gx+Hy+< a href = '#SkMatrix_I' > I< / a > Gx+Hy+< a href = '#SkMatrix_I' > I< / a >
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### Parameters
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< table > < tr > < td > < a name = 'SkMatrix_mapXY_x' > < code > < strong > x< / strong > < / code > < / a > < / td >
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< td > x-axis value of < a href = 'SkPoint_Reference#SkPoint' > SkPoint< / a > to map< / td >
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< / tr >
< tr > < td > < a name = 'SkMatrix_mapXY_y' > < code > < strong > y< / strong > < / code > < / a > < / td >
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< td > y-axis value of < a href = 'SkPoint_Reference#SkPoint' > SkPoint< / a > to map< / td >
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< / tr >
< tr > < td > < a name = 'SkMatrix_mapXY_result' > < code > < strong > result< / strong > < / code > < / a > < / td >
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< td > storage for mapped < a href = 'SkPoint_Reference#SkPoint' > SkPoint< / a > < / td >
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< / tr >
< / table >
### Example
2019-10-11 15:46:30 +00:00
< div > < fiddle-embed name = "@Matrix_mapXY" > < / fiddle-embed > < / div >
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### See Also
2018-11-07 19:59:03 +00:00
< a href = '#SkMatrix_mapPoints' > mapPoints< / a > < a href = '#SkMatrix_mapVectors' > mapVectors< / a >
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2018-05-16 11:07:07 +00:00
< a name = 'SkMatrix_mapXY_2' > < / a >
2018-01-26 17:56:22 +00:00
2018-10-16 14:30:28 +00:00
---
2018-05-16 11:07:07 +00:00
< pre style = "padding: 1em 1em 1em 1em; width: 62.5em;background-color: #f0f0f0 " >
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< a href = 'SkPoint_Reference#SkPoint' > SkPoint< / a > < a href = '#SkMatrix_mapXY' > mapXY< / a > (< a href = 'undocumented#SkScalar' > SkScalar< / a > x, < a href = 'undocumented#SkScalar' > SkScalar< / a > y)const
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< / pre >
2018-11-09 21:04:58 +00:00
Returns < a href = 'SkPoint_Reference#SkPoint' > SkPoint< / a > (< a href = '#SkMatrix_mapXY_2_x' > x< / a > , < a href = '#SkMatrix_mapXY_2_y' > y< / a > ) multiplied by < a href = 'SkMatrix_Reference#SkMatrix' > SkMatrix< / a > . Given:
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| A B C | | < a href = '#SkMatrix_mapXY_2_x' > x< / a > |
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< a href = 'SkMatrix_Reference#Matrix' > Matrix< / a > = | D E F |, pt = | < a href = '#SkMatrix_mapXY_2_y' > y< / a > |
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| G H < a href = '#SkMatrix_I' > I< / a > | | 1 |
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result is computed as:
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|A B C| |< a href = '#SkMatrix_mapXY_2_x' > x< / a > | Ax+By+C Dx+Ey+F
< a href = 'SkMatrix_Reference#Matrix' > Matrix< / a > * pt = |D E F| |< a href = '#SkMatrix_mapXY_2_y' > y< / a > | = |Ax+By+C Dx+Ey+F Gx+Hy+< a href = '#SkMatrix_I' > I< / a > | = ------- , -------
|G H < a href = '#SkMatrix_I' > I< / a > | |1| Gx+Hy+< a href = '#SkMatrix_I' > I< / a > Gx+Hy+< a href = '#SkMatrix_I' > I< / a >
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### Parameters
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< table > < tr > < td > < a name = 'SkMatrix_mapXY_2_x' > < code > < strong > x< / strong > < / code > < / a > < / td >
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< td > x-axis value of < a href = 'SkPoint_Reference#SkPoint' > SkPoint< / a > to map< / td >
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< / tr >
< tr > < td > < a name = 'SkMatrix_mapXY_2_y' > < code > < strong > y< / strong > < / code > < / a > < / td >
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< td > y-axis value of < a href = 'SkPoint_Reference#SkPoint' > SkPoint< / a > to map< / td >
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< / tr >
< / table >
### Return Value
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mapped < a href = 'SkPoint_Reference#SkPoint' > SkPoint< / a >
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### Example
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< div > < fiddle-embed name = "@Matrix_mapXY_2" > < / fiddle-embed > < / div >
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### See Also
2018-11-07 19:59:03 +00:00
< a href = '#SkMatrix_mapPoints' > mapPoints< / a > < a href = '#SkMatrix_mapVectors' > mapVectors< / a >
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2018-05-16 11:07:07 +00:00
< a name = 'SkMatrix_mapVectors' > < / a >
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---
2017-10-26 11:58:48 +00:00
2018-05-16 11:07:07 +00:00
< pre style = "padding: 1em 1em 1em 1em; width: 62.5em;background-color: #f0f0f0 " >
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void < a href = '#SkMatrix_mapVectors' > mapVectors< / a > (< a href = 'SkPoint_Reference#SkVector' > SkVector< / a > dst[], const < a href = 'SkPoint_Reference#SkVector' > SkVector< / a > src[], int count)const
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< / pre >
2018-11-09 21:04:58 +00:00
Maps < a href = '#SkMatrix_mapVectors_src' > src< / a > < a href = 'SkPoint_Reference#Vector' > vector< / a > array of length < a href = '#SkMatrix_mapVectors_count' > count< / a > to < a href = 'SkPoint_Reference#Vector' > vector< / a > < a href = 'SkPath_Reference#Point_Array' > SkPoint array< / a > of equal or greater
length. < a href = 'SkPoint_Reference#Vector' > Vectors< / a > are mapped by multiplying each < a href = 'SkPoint_Reference#Vector' > vector< / a > by < a href = 'SkMatrix_Reference#SkMatrix' > SkMatrix< / a > , treating
< a href = 'SkMatrix_Reference#SkMatrix' > SkMatrix< / a > translation as zero. Given:
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| A B 0 | | x |
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< a href = 'SkMatrix_Reference#Matrix' > Matrix< / a > = | D E 0 |, < a href = '#SkMatrix_mapVectors_src' > src< / a > = | y |
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| G H < a href = '#SkMatrix_I' > I< / a > | | 1 |
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where
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for (i = 0; i < < a href = '#SkMatrix_mapVectors_count' > count< / a > ; ++i) {
x = < a href = '#SkMatrix_mapVectors_src' > src< / a > [i].fX
y = < a href = '#SkMatrix_mapVectors_src' > src< / a > [i].fY
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}
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each < a href = '#SkMatrix_mapVectors_dst' > dst< / a > < a href = 'SkPoint_Reference#Vector' > vector< / a > is computed as:
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|A B 0| |x| Ax+By Dx+Ey
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< a href = 'SkMatrix_Reference#Matrix' > Matrix< / a > * < a href = '#SkMatrix_mapVectors_src' > src< / a > = |D E 0| |y| = |Ax+By Dx+Ey Gx+Hy+< a href = '#SkMatrix_I' > I< / a > | = ------- , -------
|G H < a href = '#SkMatrix_I' > I< / a > | |1| Gx+Hy+< a href = '#SkMatrix_I' > I< / a > Gx+Hy+< a href = '#SkMatrix_I' > I< / a >
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< a href = '#SkMatrix_mapVectors_src' > src< / a > and < a href = '#SkMatrix_mapVectors_dst' > dst< / a > may < a href = 'SkPoint_Reference#Point' > point< / a > to the same storage.
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### Parameters
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< table > < tr > < td > < a name = 'SkMatrix_mapVectors_dst' > < code > < strong > dst< / strong > < / code > < / a > < / td >
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< td > storage for mapped < a href = 'SkPoint_Reference#Vector' > vectors< / a > < / td >
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< / tr >
< tr > < td > < a name = 'SkMatrix_mapVectors_src' > < code > < strong > src< / strong > < / code > < / a > < / td >
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< td > < a href = 'SkPoint_Reference#Vector' > vectors< / a > to transform< / td >
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< / tr >
< tr > < td > < a name = 'SkMatrix_mapVectors_count' > < code > < strong > count< / strong > < / code > < / a > < / td >
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< td > number of < a href = 'SkPoint_Reference#Vector' > vectors< / a > to transform< / td >
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< / tr >
< / table >
### Example
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< div > < fiddle-embed name = "@Matrix_mapVectors" > < / fiddle-embed > < / div >
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### See Also
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< a href = '#SkMatrix_mapVector' > mapVector< / a > < a href = '#SkMatrix_mapPoints' > mapPoints< / a > < a href = '#SkMatrix_mapXY' > mapXY< / a >
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< a name = 'SkMatrix_mapVectors_2' > < / a >
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2018-10-16 14:30:28 +00:00
---
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< pre style = "padding: 1em 1em 1em 1em; width: 62.5em;background-color: #f0f0f0 " >
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void < a href = '#SkMatrix_mapVectors' > mapVectors< / a > (< a href = 'SkPoint_Reference#SkVector' > SkVector< / a > vecs[], int count)const
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< / pre >
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Maps < a href = '#SkMatrix_mapVectors_2_vecs' > vecs< / a > < a href = 'SkPoint_Reference#Vector' > vector< / a > array of length < a href = '#SkMatrix_mapVectors_2_count' > count< / a > in place, multiplying each < a href = 'SkPoint_Reference#Vector' > vector< / a > by
< a href = 'SkMatrix_Reference#SkMatrix' > SkMatrix< / a > , treating < a href = 'SkMatrix_Reference#SkMatrix' > SkMatrix< / a > translation as zero. Given:
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| A B 0 | | x |
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< a href = 'SkMatrix_Reference#Matrix' > Matrix< / a > = | D E 0 |, vec = | y |
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| G H < a href = '#SkMatrix_I' > I< / a > | | 1 |
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where
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for (i = 0; i < < a href = '#SkMatrix_mapVectors_2_count' > count< / a > ; ++i) {
x = < a href = '#SkMatrix_mapVectors_2_vecs' > vecs< / a > [i].fX
y = < a href = '#SkMatrix_mapVectors_2_vecs' > vecs< / a > [i].fY
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}
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each result < a href = 'SkPoint_Reference#Vector' > vector< / a > is computed as:
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|A B 0| |x| Ax+By Dx+Ey
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< a href = 'SkMatrix_Reference#Matrix' > Matrix< / a > * vec = |D E 0| |y| = |Ax+By Dx+Ey Gx+Hy+< a href = '#SkMatrix_I' > I< / a > | = ------- , -------
|G H < a href = '#SkMatrix_I' > I< / a > | |1| Gx+Hy+< a href = '#SkMatrix_I' > I< / a > Gx+Hy+< a href = '#SkMatrix_I' > I< / a >
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### Parameters
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< table > < tr > < td > < a name = 'SkMatrix_mapVectors_2_vecs' > < code > < strong > vecs< / strong > < / code > < / a > < / td >
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< td > < a href = 'SkPoint_Reference#Vector' > vectors< / a > to transform, and storage for mapped < a href = 'SkPoint_Reference#Vector' > vectors< / a > < / td >
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< / tr >
< tr > < td > < a name = 'SkMatrix_mapVectors_2_count' > < code > < strong > count< / strong > < / code > < / a > < / td >
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< td > number of < a href = 'SkPoint_Reference#Vector' > vectors< / a > to transform< / td >
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< / tr >
< / table >
### Example
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< div > < fiddle-embed name = "@Matrix_mapVectors_2" > < / fiddle-embed > < / div >
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### See Also
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< a href = '#SkMatrix_mapVector' > mapVector< / a > < a href = '#SkMatrix_mapPoints' > mapPoints< / a > < a href = '#SkMatrix_mapXY' > mapXY< / a >
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< a name = 'SkMatrix_mapVector' > < / a >
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---
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< pre style = "padding: 1em 1em 1em 1em; width: 62.5em;background-color: #f0f0f0 " >
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void < a href = '#SkMatrix_mapVector' > mapVector< / a > (< a href = 'undocumented#SkScalar' > SkScalar< / a > dx, < a href = 'undocumented#SkScalar' > SkScalar< / a > dy, < a href = 'SkPoint_Reference#SkVector' > SkVector< / a > * result)const
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< / pre >
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Maps < a href = 'SkPoint_Reference#Vector' > vector< / a > (< a href = '#SkMatrix_mapVector_dx' > dx< / a > , < a href = '#SkMatrix_mapVector_dy' > dy< / a > ) to < a href = '#SkMatrix_mapVector_result' > result< / a > . < a href = 'SkPoint_Reference#Vector' > Vector< / a > is mapped by multiplying by < a href = 'SkMatrix_Reference#SkMatrix' > SkMatrix< / a > ,
treating < a href = 'SkMatrix_Reference#SkMatrix' > SkMatrix< / a > translation as zero. Given:
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| A B 0 | | < a href = '#SkMatrix_mapVector_dx' > dx< / a > |
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< a href = 'SkMatrix_Reference#Matrix' > Matrix< / a > = | D E 0 |, vec = | < a href = '#SkMatrix_mapVector_dy' > dy< / a > |
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| G H < a href = '#SkMatrix_I' > I< / a > | | 1 |
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each < a href = '#SkMatrix_mapVector_result' > result< / a > < a href = 'SkPoint_Reference#Vector' > vector< / a > is computed as:
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|A B 0| |< a href = '#SkMatrix_mapVector_dx' > dx< / a > | A*< a href = '#SkMatrix_mapVector_dx' > dx< / a > +B*< a href = '#SkMatrix_mapVector_dy' > dy< / a > D*< a href = '#SkMatrix_mapVector_dx' > dx< / a > +E*< a href = '#SkMatrix_mapVector_dy' > dy< / a >
< a href = 'SkMatrix_Reference#Matrix' > Matrix</ a > * vec = |D E 0| |<a href='#SkMatrix_mapVector_dy'>dy</a>| = |A* < a href = '#SkMatrix_mapVector_dx' > dx</ a > +B*< a href = '#SkMatrix_mapVector_dy' > dy</ a > D*< a href = '#SkMatrix_mapVector_dx' > dx</ a > +E*< a href = '#SkMatrix_mapVector_dy' > dy</ a > G*< a href = '#SkMatrix_mapVector_dx' > dx</ a > +H*< a href = '#SkMatrix_mapVector_dy' > dy</ a > +< a href = '#SkMatrix_I' > I</ a > | = ----------- , -----------
|G H < a href = '#SkMatrix_I' > I< / a > | | 1| G*< a href = '#SkMatrix_mapVector_dx' > dx< / a > +H*< a href = '#SkMatrix_mapVector_dy' > dy< / a > +< a href = '#SkMatrix_I' > I< / a > G*< a href = '#SkMatrix_mapVector_dx' > dx< / a > +*dHy+< a href = '#SkMatrix_I' > I< / a >
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### Parameters
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< table > < tr > < td > < a name = 'SkMatrix_mapVector_dx' > < code > < strong > dx< / strong > < / code > < / a > < / td >
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< td > x-axis value of < a href = 'SkPoint_Reference#Vector' > vector< / a > to map< / td >
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< / tr >
< tr > < td > < a name = 'SkMatrix_mapVector_dy' > < code > < strong > dy< / strong > < / code > < / a > < / td >
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< td > y-axis value of < a href = 'SkPoint_Reference#Vector' > vector< / a > to map< / td >
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< / tr >
< tr > < td > < a name = 'SkMatrix_mapVector_result' > < code > < strong > result< / strong > < / code > < / a > < / td >
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< td > storage for mapped < a href = 'SkPoint_Reference#Vector' > vector< / a > < / td >
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< / tr >
< / table >
### Example
< div > < fiddle-embed name = "aed143fc6cd0bce4ed029b98d1e61f2d" > < / fiddle-embed > < / div >
### See Also
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< a href = '#SkMatrix_mapVectors' > mapVectors< / a > < a href = '#SkMatrix_mapPoints' > mapPoints< / a > < a href = '#SkMatrix_mapXY' > mapXY< / a >
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< a name = 'SkMatrix_mapVector_2' > < / a >
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---
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< pre style = "padding: 1em 1em 1em 1em; width: 62.5em;background-color: #f0f0f0 " >
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< a href = 'SkPoint_Reference#SkVector' > SkVector< / a > < a href = '#SkMatrix_mapVector' > mapVector< / a > (< a href = 'undocumented#SkScalar' > SkScalar< / a > dx, < a href = 'undocumented#SkScalar' > SkScalar< / a > dy)const
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< / pre >
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Returns < a href = 'SkPoint_Reference#Vector' > vector< / a > (< a href = '#SkMatrix_mapVector_2_dx' > dx< / a > , < a href = '#SkMatrix_mapVector_2_dy' > dy< / a > ) multiplied by < a href = 'SkMatrix_Reference#SkMatrix' > SkMatrix< / a > , treating < a href = 'SkMatrix_Reference#SkMatrix' > SkMatrix< / a > translation as zero.
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Given:
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| A B 0 | | < a href = '#SkMatrix_mapVector_2_dx' > dx< / a > |
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< a href = 'SkMatrix_Reference#Matrix' > Matrix< / a > = | D E 0 |, vec = | < a href = '#SkMatrix_mapVector_2_dy' > dy< / a > |
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| G H < a href = '#SkMatrix_I' > I< / a > | | 1 |
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each result < a href = 'SkPoint_Reference#Vector' > vector< / a > is computed as:
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|A B 0| |< a href = '#SkMatrix_mapVector_2_dx' > dx< / a > | A*< a href = '#SkMatrix_mapVector_2_dx' > dx< / a > +B*< a href = '#SkMatrix_mapVector_2_dy' > dy< / a > D*< a href = '#SkMatrix_mapVector_2_dx' > dx< / a > +E*< a href = '#SkMatrix_mapVector_2_dy' > dy< / a >
< a href = 'SkMatrix_Reference#Matrix' > Matrix</ a > * vec = |D E 0| |<a href='#SkMatrix_mapVector_2_dy'>dy</a>| = |A* < a href = '#SkMatrix_mapVector_2_dx' > dx</ a > +B*< a href = '#SkMatrix_mapVector_2_dy' > dy</ a > D*< a href = '#SkMatrix_mapVector_2_dx' > dx</ a > +E*< a href = '#SkMatrix_mapVector_2_dy' > dy</ a > G*< a href = '#SkMatrix_mapVector_2_dx' > dx</ a > +H*< a href = '#SkMatrix_mapVector_2_dy' > dy</ a > +< a href = '#SkMatrix_I' > I</ a > | = ----------- , -----------
|G H < a href = '#SkMatrix_I' > I< / a > | | 1| G*< a href = '#SkMatrix_mapVector_2_dx' > dx< / a > +H*< a href = '#SkMatrix_mapVector_2_dy' > dy< / a > +< a href = '#SkMatrix_I' > I< / a > G*< a href = '#SkMatrix_mapVector_2_dx' > dx< / a > +*dHy+< a href = '#SkMatrix_I' > I< / a >
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### Parameters
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< table > < tr > < td > < a name = 'SkMatrix_mapVector_2_dx' > < code > < strong > dx< / strong > < / code > < / a > < / td >
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< td > x-axis value of < a href = 'SkPoint_Reference#Vector' > vector< / a > to map< / td >
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< / tr >
< tr > < td > < a name = 'SkMatrix_mapVector_2_dy' > < code > < strong > dy< / strong > < / code > < / a > < / td >
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< td > y-axis value of < a href = 'SkPoint_Reference#Vector' > vector< / a > to map< / td >
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< / tr >
< / table >
### Return Value
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mapped < a href = 'SkPoint_Reference#Vector' > vector< / a >
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### Example
< div > < fiddle-embed name = "8bf1518db3f369696cd3065b541a8bd7" > < / fiddle-embed > < / div >
### See Also
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< a href = '#SkMatrix_mapVectors' > mapVectors< / a > < a href = '#SkMatrix_mapPoints' > mapPoints< / a > < a href = '#SkMatrix_mapXY' > mapXY< / a >
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< a name = 'SkMatrix_mapRect' > < / a >
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---
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< pre style = "padding: 1em 1em 1em 1em; width: 62.5em;background-color: #f0f0f0 " >
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bool < a href = '#SkMatrix_mapRect' > mapRect< / a > (< a href = 'SkRect_Reference#SkRect' > SkRect< / a > * dst, const < a href = 'SkRect_Reference#SkRect' > SkRect< / a > & src)const
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< / pre >
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Sets < a href = '#SkMatrix_mapRect_dst' > dst< / a > to bounds of < a href = '#SkMatrix_mapRect_src' > src< / a > corners mapped by < a href = 'SkMatrix_Reference#SkMatrix' > SkMatrix< / a > .
Returns true if mapped corners are < a href = '#SkMatrix_mapRect_dst' > dst< / a > corners.
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Returned value is the same as calling < a href = '#SkMatrix_rectStaysRect' > rectStaysRect< / a > ().
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### Parameters
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< table > < tr > < td > < a name = 'SkMatrix_mapRect_dst' > < code > < strong > dst< / strong > < / code > < / a > < / td >
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< td > storage for bounds of mapped < a href = 'SkPoint_Reference#SkPoint' > SkPoint< / a > < / td >
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< / tr >
< tr > < td > < a name = 'SkMatrix_mapRect_src' > < code > < strong > src< / strong > < / code > < / a > < / td >
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< td > < a href = 'SkRect_Reference#SkRect' > SkRect< / a > to map< / td >
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< / tr >
< / table >
### Return Value
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true if < a href = '#SkMatrix_mapRect_dst' > dst< / a > is equivalent to mapped < a href = '#SkMatrix_mapRect_src' > src< / a >
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### Example
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< div > < fiddle-embed name = "@Matrix_mapRect" > < / fiddle-embed > < / div >
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### See Also
2018-11-07 19:59:03 +00:00
< a href = '#SkMatrix_mapPoints' > mapPoints< / a > < a href = '#SkMatrix_rectStaysRect' > rectStaysRect< / a >
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2018-05-16 11:07:07 +00:00
< a name = 'SkMatrix_mapRect_2' > < / a >
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2018-10-16 14:30:28 +00:00
---
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< pre style = "padding: 1em 1em 1em 1em; width: 62.5em;background-color: #f0f0f0 " >
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bool < a href = '#SkMatrix_mapRect' > mapRect< / a > (< a href = 'SkRect_Reference#SkRect' > SkRect< / a > * < a href = 'SkRect_Reference#Rect' > rect< / a > )const
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< / pre >
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Sets < a href = '#SkMatrix_mapRect_2_rect' > rect< / a > to bounds of < a href = '#SkMatrix_mapRect_2_rect' > rect< / a > corners mapped by < a href = 'SkMatrix_Reference#SkMatrix' > SkMatrix< / a > .
Returns true if mapped corners are computed < a href = '#SkMatrix_mapRect_2_rect' > rect< / a > corners.
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Returned value is the same as calling < a href = '#SkMatrix_rectStaysRect' > rectStaysRect< / a > ().
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### Parameters
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< table > < tr > < td > < a name = 'SkMatrix_mapRect_2_rect' > < code > < strong > rect< / strong > < / code > < / a > < / td >
< td > rectangle to map, and storage for bounds of mapped corners< / td >
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< / tr >
< / table >
### Return Value
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true if result is equivalent to mapped < a href = '#SkMatrix_mapRect_2_rect' > rect< / a >
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### Example
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< div > < fiddle-embed name = "@Matrix_mapRect_2" > < / fiddle-embed > < / div >
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### See Also
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< a href = '#SkMatrix_mapRectScaleTranslate' > mapRectScaleTranslate< / a > < a href = '#SkMatrix_mapPoints' > mapPoints< / a > < a href = '#SkMatrix_rectStaysRect' > rectStaysRect< / a >
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< a name = 'SkMatrix_mapRect_3' > < / a >
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---
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< pre style = "padding: 1em 1em 1em 1em; width: 62.5em;background-color: #f0f0f0 " >
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< a href = 'SkRect_Reference#SkRect' > SkRect< / a > < a href = '#SkMatrix_mapRect' > mapRect< / a > (const < a href = 'SkRect_Reference#SkRect' > SkRect< / a > & src)const
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< / pre >
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Returns bounds of < a href = '#SkMatrix_mapRect_3_src' > src< / a > corners mapped by < a href = 'SkMatrix_Reference#SkMatrix' > SkMatrix< / a > .
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### Parameters
< table > < tr > < td > < a name = 'SkMatrix_mapRect_3_src' > < code > < strong > src< / strong > < / code > < / a > < / td >
< td > rectangle to map< / td >
< / tr >
< / table >
### Return Value
mapped bounds
### Example
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< div > < fiddle-embed name = "@Matrix_mapRect_3" > < / fiddle-embed > < / div >
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### See Also
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< a href = '#SkMatrix_mapRectToQuad' > mapRectToQuad< / a > < a href = '#SkMatrix_mapRectScaleTranslate' > mapRectScaleTranslate< / a >
2018-05-17 01:28:55 +00:00
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< a name = 'SkMatrix_mapRectToQuad' > < / a >
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---
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< pre style = "padding: 1em 1em 1em 1em; width: 62.5em;background-color: #f0f0f0 " >
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void < a href = '#SkMatrix_mapRectToQuad' > mapRectToQuad< / a > (< a href = 'SkPoint_Reference#SkPoint' > SkPoint< / a > dst[4], const < a href = 'SkRect_Reference#SkRect' > SkRect< / a > & < a href = 'SkRect_Reference#Rect' > rect< / a > )const
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< / pre >
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Maps four corners of < a href = '#SkMatrix_mapRectToQuad_rect' > rect< / a > to < a href = '#SkMatrix_mapRectToQuad_dst' > dst< / a > . < a href = 'SkPoint_Reference#SkPoint' > SkPoint< / a > are mapped by multiplying each
< a href = '#SkMatrix_mapRectToQuad_rect' > rect< / a > corner by < a href = 'SkMatrix_Reference#SkMatrix' > SkMatrix< / a > . < a href = '#SkMatrix_mapRectToQuad_rect' > rect< / a > corner is processed in this order:
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(< a href = '#SkMatrix_mapRectToQuad_rect' > rect< / a > .< a href = '#SkRect_fLeft' > fLeft< / a > , < a href = '#SkMatrix_mapRectToQuad_rect' > rect< / a > .< a href = '#SkRect_fTop' > fTop< / a > ), (< a href = '#SkMatrix_mapRectToQuad_rect' > rect< / a > .< a href = '#SkRect_fRight' > fRight< / a > , < a href = '#SkMatrix_mapRectToQuad_rect' > rect< / a > .< a href = '#SkRect_fTop' > fTop< / a > ), (< a href = '#SkMatrix_mapRectToQuad_rect' > rect< / a > .< a href = '#SkRect_fRight' > fRight< / a > , < a href = '#SkMatrix_mapRectToQuad_rect' > rect< / a > .< a href = '#SkRect_fBottom' > fBottom< / a > ),
(< a href = '#SkMatrix_mapRectToQuad_rect' > rect< / a > .< a href = '#SkRect_fLeft' > fLeft< / a > , < a href = '#SkMatrix_mapRectToQuad_rect' > rect< / a > .< a href = '#SkRect_fBottom' > fBottom< / a > ).
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< a href = '#SkMatrix_mapRectToQuad_rect' > rect< / a > may be empty: < a href = '#SkMatrix_mapRectToQuad_rect' > rect< / a > .< a href = '#SkRect_fLeft' > fLeft< / a > may be greater than or equal to < a href = '#SkMatrix_mapRectToQuad_rect' > rect< / a > .< a href = '#SkRect_fRight' > fRight< / a > ;
< a href = '#SkMatrix_mapRectToQuad_rect' > rect< / a > .< a href = '#SkRect_fTop' > fTop< / a > may be greater than or equal to < a href = '#SkMatrix_mapRectToQuad_rect' > rect< / a > .< a href = '#SkRect_fBottom' > fBottom< / a > .
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Given:
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| A B C | | x |
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< a href = 'SkMatrix_Reference#Matrix' > Matrix< / a > = | D E F |, pt = | y |
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| G H < a href = '#SkMatrix_I' > I< / a > | | 1 |
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where pt is initialized from each of (< a href = '#SkMatrix_mapRectToQuad_rect' > rect< / a > .< a href = '#SkRect_fLeft' > fLeft< / a > , < a href = '#SkMatrix_mapRectToQuad_rect' > rect< / a > .< a href = '#SkRect_fTop' > fTop< / a > ),
(< a href = '#SkMatrix_mapRectToQuad_rect' > rect< / a > .< a href = '#SkRect_fRight' > fRight< / a > , < a href = '#SkMatrix_mapRectToQuad_rect' > rect< / a > .< a href = '#SkRect_fTop' > fTop< / a > ), (< a href = '#SkMatrix_mapRectToQuad_rect' > rect< / a > .< a href = '#SkRect_fRight' > fRight< / a > , < a href = '#SkMatrix_mapRectToQuad_rect' > rect< / a > .< a href = '#SkRect_fBottom' > fBottom< / a > ), (< a href = '#SkMatrix_mapRectToQuad_rect' > rect< / a > .< a href = '#SkRect_fLeft' > fLeft< / a > , < a href = '#SkMatrix_mapRectToQuad_rect' > rect< / a > .< a href = '#SkRect_fBottom' > fBottom< / a > ),
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each < a href = '#SkMatrix_mapRectToQuad_dst' > dst< / a > < a href = 'SkPoint_Reference#SkPoint' > SkPoint< / a > is computed as:
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|A B C| |x| Ax+By+C Dx+Ey+F
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< a href = 'SkMatrix_Reference#Matrix' > Matrix< / a > * pt = |D E F| |y| = |Ax+By+C Dx+Ey+F Gx+Hy+< a href = '#SkMatrix_I' > I< / a > | = ------- , -------
|G H < a href = '#SkMatrix_I' > I< / a > | |1| Gx+Hy+< a href = '#SkMatrix_I' > I< / a > Gx+Hy+< a href = '#SkMatrix_I' > I< / a >
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### Parameters
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< table > < tr > < td > < a name = 'SkMatrix_mapRectToQuad_dst' > < code > < strong > dst< / strong > < / code > < / a > < / td >
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< td > storage for mapped corner < a href = 'SkPoint_Reference#SkPoint' > SkPoint< / a > < / td >
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< / tr >
< tr > < td > < a name = 'SkMatrix_mapRectToQuad_rect' > < code > < strong > rect< / strong > < / code > < / a > < / td >
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< td > < a href = 'SkRect_Reference#SkRect' > SkRect< / a > to map< / td >
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< / tr >
< / table >
### Example
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< div > < fiddle-embed name = "@Matrix_mapRectToQuad" > < / fiddle-embed > < / div >
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### See Also
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< a href = '#SkMatrix_mapRect' > mapRect< / a > < a href = '#SkMatrix_mapRectScaleTranslate' > mapRectScaleTranslate< / a >
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< a name = 'SkMatrix_mapRectScaleTranslate' > < / a >
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---
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< pre style = "padding: 1em 1em 1em 1em; width: 62.5em;background-color: #f0f0f0 " >
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void < a href = '#SkMatrix_mapRectScaleTranslate' > mapRectScaleTranslate< / a > (< a href = 'SkRect_Reference#SkRect' > SkRect< / a > * dst, const < a href = 'SkRect_Reference#SkRect' > SkRect< / a > & src)const
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< / pre >
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Sets < a href = '#SkMatrix_mapRectScaleTranslate_dst' > dst< / a > to bounds of < a href = '#SkMatrix_mapRectScaleTranslate_src' > src< / a > corners mapped by < a href = 'SkMatrix_Reference#SkMatrix' > SkMatrix< / a > . If < a href = 'SkMatrix_Reference#Matrix' > matrix< / a > contains
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elements other than scale or translate: asserts if SK_DEBUG is defined;
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otherwise, results are undefined.
### Parameters
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< table > < tr > < td > < a name = 'SkMatrix_mapRectScaleTranslate_dst' > < code > < strong > dst< / strong > < / code > < / a > < / td >
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< td > storage for bounds of mapped < a href = 'SkPoint_Reference#SkPoint' > SkPoint< / a > < / td >
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< / tr >
< tr > < td > < a name = 'SkMatrix_mapRectScaleTranslate_src' > < code > < strong > src< / strong > < / code > < / a > < / td >
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< td > < a href = 'SkRect_Reference#SkRect' > SkRect< / a > to map< / td >
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< / tr >
< / table >
### Example
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< div > < fiddle-embed name = "@Matrix_mapRectScaleTranslate" > < / fiddle-embed > < / div >
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### See Also
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< a href = '#SkMatrix_mapRect' > mapRect< / a > < a href = '#SkMatrix_mapRectToQuad' > mapRectToQuad< / a > < a href = '#SkMatrix_isScaleTranslate' > isScaleTranslate< / a > < a href = '#SkMatrix_rectStaysRect' > rectStaysRect< / a >
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< a name = 'SkMatrix_mapRadius' > < / a >
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---
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< pre style = "padding: 1em 1em 1em 1em; width: 62.5em;background-color: #f0f0f0 " >
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< a href = 'undocumented#SkScalar' > SkScalar< / a > < a href = '#SkMatrix_mapRadius' > mapRadius< / a > (< a href = 'undocumented#SkScalar' > SkScalar< / a > radius)const
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< / pre >
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Returns geometric mean < a href = '#SkMatrix_mapRadius_radius' > radius< / a > of ellipse formed by constructing < a href = 'undocumented#Circle' > circle< / a > of
< a href = 'undocumented#Size' > size< / a > < a href = '#SkMatrix_mapRadius_radius' > radius< / a > , and mapping constructed < a href = 'undocumented#Circle' > circle< / a > with < a href = 'SkMatrix_Reference#SkMatrix' > SkMatrix< / a > . The result squared is
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equal to the major axis length times the minor axis length.
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Result is not meaningful if < a href = 'SkMatrix_Reference#SkMatrix' > SkMatrix< / a > contains perspective elements.
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### Parameters
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< table > < tr > < td > < a name = 'SkMatrix_mapRadius_radius' > < code > < strong > radius< / strong > < / code > < / a > < / td >
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< td > < a href = 'undocumented#Circle' > circle< / a > < a href = 'undocumented#Size' > size< / a > to map< / td >
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< / tr >
< / table >
### Return Value
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average mapped < a href = '#SkMatrix_mapRadius_radius' > radius< / a >
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### Example
< div > < fiddle-embed name = "6d6f2082fcf59d9f02bfb1758b87db69" > < div > The area enclosed by a square with sides equal to mappedRadius is the same as
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the area enclosed by the ellipse major and minor axes.
< / div > < / fiddle-embed > < / div >
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### See Also
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< a href = '#SkMatrix_mapVector' > mapVector< / a >
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< a name = 'SkMatrix_isFixedStepInX' > < / a >
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---
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< pre style = "padding: 1em 1em 1em 1em; width: 62.5em;background-color: #f0f0f0 " >
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bool < a href = '#SkMatrix_isFixedStepInX' > isFixedStepInX< / a > ()const
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< / pre >
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Returns true if a unit step on x-axis at some y-axis value mapped through < a href = 'SkMatrix_Reference#SkMatrix' > SkMatrix< / a >
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can be represented by a constant < a href = 'SkPoint_Reference#Vector' > vector< / a > . Returns true if < a href = '#SkMatrix_getType' > getType< / a > () returns
< a href = '#SkMatrix_kIdentity_Mask' > kIdentity_Mask< / a > , or combinations of: < a href = '#SkMatrix_kTranslate_Mask' > kTranslate_Mask< / a > , < a href = '#SkMatrix_kScale_Mask' > kScale_Mask< / a > , and < a href = '#SkMatrix_kAffine_Mask' > kAffine_Mask< / a > .
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May return true if < a href = '#SkMatrix_getType' > getType< / a > () returns < a href = '#SkMatrix_kPerspective_Mask' > kPerspective_Mask< / a > , but only when < a href = 'SkMatrix_Reference#SkMatrix' > SkMatrix< / a >
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does not include rotation or skewing along the y-axis.
### Return Value
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true if < a href = 'SkMatrix_Reference#SkMatrix' > SkMatrix< / a > does not have complex perspective
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### Example
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< div > < fiddle-embed name = "@Matrix_isFixedStepInX" >
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#### Example Output
~~~~
[ 1.0000 0.0000 0.0000][ 0.0000 1.0000 0.0000][ 0.0000 0.0000 1.0000]
isFixedStepInX: true
[ 1.0000 0.0000 0.0000][ 0.0000 2.0000 0.0000][ 0.0000 0.0000 1.0000]
isFixedStepInX: true
[ 1.0000 0.0000 0.0000][ 0.0000 1.0000 0.0000][ 0.0000 0.1000 1.0000]
isFixedStepInX: true
[ 1.0000 0.0000 0.0000][ 0.0000 2.0000 0.0000][ 0.0000 0.1000 1.0000]
isFixedStepInX: true
[ 1.0000 0.0000 0.0000][ 0.0000 1.0000 0.0000][ 0.1000 0.0000 1.0000]
isFixedStepInX: false
[ 1.0000 0.0000 0.0000][ 0.0000 2.0000 0.0000][ 0.1000 0.0000 1.0000]
isFixedStepInX: false
[ 1.0000 0.0000 0.0000][ 0.0000 1.0000 0.0000][ 0.1000 0.1000 1.0000]
isFixedStepInX: false
[ 1.0000 0.0000 0.0000][ 0.0000 2.0000 0.0000][ 0.1000 0.1000 1.0000]
isFixedStepInX: false
~~~~
< / fiddle-embed > < / div >
### See Also
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< a href = '#SkMatrix_fixedStepInX' > fixedStepInX< / a > < a href = '#SkMatrix_getType' > getType< / a >
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< a name = 'SkMatrix_fixedStepInX' > < / a >
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---
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< pre style = "padding: 1em 1em 1em 1em; width: 62.5em;background-color: #f0f0f0 " >
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< a href = 'SkPoint_Reference#SkVector' > SkVector< / a > < a href = '#SkMatrix_fixedStepInX' > fixedStepInX< / a > (< a href = 'undocumented#SkScalar' > SkScalar< / a > y)const
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< / pre >
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Returns < a href = 'SkPoint_Reference#Vector' > vector< / a > representing a unit step on x-axis at < a href = '#SkMatrix_fixedStepInX_y' > y< / a > mapped through < a href = 'SkMatrix_Reference#SkMatrix' > SkMatrix< / a > .
If < a href = '#SkMatrix_isFixedStepInX' > isFixedStepInX< / a > () is false, returned value is undefined.
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### Parameters
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< table > < tr > < td > < a name = 'SkMatrix_fixedStepInX_y' > < code > < strong > y< / strong > < / code > < / a > < / td >
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< td > position of < a href = 'undocumented#Line' > line< / a > parallel to x-axis< / td >
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< / tr >
< / table >
### Return Value
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< a href = 'SkPoint_Reference#Vector' > vector< / a > advance of mapped unit step on x-axis
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### Example
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< div > < fiddle-embed name = "@Matrix_fixedStepInX" > < / fiddle-embed > < / div >
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### See Also
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< a href = '#SkMatrix_isFixedStepInX' > isFixedStepInX< / a > < a href = '#SkMatrix_getType' > getType< / a >
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< a name = 'SkMatrix_cheapEqualTo' > < / a >
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---
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< pre style = "padding: 1em 1em 1em 1em; width: 62.5em;background-color: #f0f0f0 " >
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bool < a href = '#SkMatrix_cheapEqualTo' > cheapEqualTo< / a > (const < a href = 'SkMatrix_Reference#SkMatrix' > SkMatrix< / a > & m)const
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< / pre >
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Returns true if < a href = 'SkMatrix_Reference#SkMatrix' > SkMatrix< / a > equals < a href = '#SkMatrix_cheapEqualTo_m' > m< / a > , using an efficient comparison.
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Returns false when the sign of zero values is the different; when one
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< a href = 'SkMatrix_Reference#Matrix' > matrix< / a > has positive zero value and the other has negative zero value.
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Returns true even when both < a href = 'SkMatrix_Reference#SkMatrix' > SkMatrix< / a > contain NaN.
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NaN never equals any value, including itself. To improve performance, NaN values
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are treated as bit patterns that are equal if their bit patterns are equal.
### Parameters
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< table > < tr > < td > < a name = 'SkMatrix_cheapEqualTo_m' > < code > < strong > m< / strong > < / code > < / a > < / td >
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< td > < a href = 'SkMatrix_Reference#SkMatrix' > SkMatrix< / a > to compare< / td >
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< / tr >
< / table >
### Return Value
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true if < a href = '#SkMatrix_cheapEqualTo_m' > m< / a > and < a href = 'SkMatrix_Reference#SkMatrix' > SkMatrix< / a > are represented by identical bit patterns
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### Example
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< div > < fiddle-embed name = "@Matrix_cheapEqualTo" >
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#### Example Output
~~~~
identity: a == b a.cheapEqualTo(b): true
neg zero: a == b a.cheapEqualTo(b): false
one NaN: a != b a.cheapEqualTo(b): false
both NaN: a != b a.cheapEqualTo(b): true
~~~~
< / fiddle-embed > < / div >
### See Also
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< a href = '#SkMatrix_equal_operator' > operator==< / a > (const < a href = 'SkMatrix_Reference#SkMatrix' > SkMatrix< / a > & a, const < a href = 'SkMatrix_Reference#SkMatrix' > SkMatrix< / a > & b)
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< a name = 'SkMatrix_equal_operator' > < / a >
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---
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< pre style = "padding: 1em 1em 1em 1em; width: 62.5em;background-color: #f0f0f0 " >
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bool < a href = '#SkMatrix_equal_operator' > operator==< / a > (const < a href = 'SkMatrix_Reference#SkMatrix' > SkMatrix< / a > & a, const < a href = 'SkMatrix_Reference#SkMatrix' > SkMatrix< / a > & b)
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< / pre >
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Compares < a href = '#SkMatrix_equal_operator_a' > a< / a > and < a href = '#SkMatrix_equal_operator_b' > b< / a > ; returns true if < a href = '#SkMatrix_equal_operator_a' > a< / a > and < a href = '#SkMatrix_equal_operator_b' > b< / a > are numerically equal. Returns true
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even if sign of zero values are different. Returns false if either < a href = 'SkMatrix_Reference#SkMatrix' > SkMatrix< / a >
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contains NaN, even if the other < a href = 'SkMatrix_Reference#SkMatrix' > SkMatrix< / a > also contains NaN.
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### Parameters
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< table > < tr > < td > < a name = 'SkMatrix_equal_operator_a' > < code > < strong > a< / strong > < / code > < / a > < / td >
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< td > < a href = 'SkMatrix_Reference#SkMatrix' > SkMatrix< / a > to compare< / td >
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< / tr >
< tr > < td > < a name = 'SkMatrix_equal_operator_b' > < code > < strong > b< / strong > < / code > < / a > < / td >
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< td > < a href = 'SkMatrix_Reference#SkMatrix' > SkMatrix< / a > to compare< / td >
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< / tr >
< / table >
### Return Value
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true if < a href = 'SkMatrix_Reference#SkMatrix' > SkMatrix< / a > < a href = '#SkMatrix_equal_operator_a' > a< / a > and < a href = 'SkMatrix_Reference#SkMatrix' > SkMatrix< / a > < a href = '#SkMatrix_equal_operator_b' > b< / a > are numerically equal
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### Example
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< div > < fiddle-embed name = "@Matrix_equal_operator" >
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#### Example Output
~~~~
identity: a == b a.cheapEqualTo(b): true
~~~~
< / fiddle-embed > < / div >
### See Also
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< a href = '#SkMatrix_cheapEqualTo' > cheapEqualTo< / a > < a href = '#SkMatrix_notequal_operator' > operator!=< / a > (const < a href = 'SkMatrix_Reference#SkMatrix' > SkMatrix< / a > & < a href = '#SkMatrix_equal_operator_a' > a< / a > , const < a href = 'SkMatrix_Reference#SkMatrix' > SkMatrix< / a > & < a href = '#SkMatrix_equal_operator_b' > b< / a > )
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< a name = 'SkMatrix_notequal_operator' > < / a >
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---
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2018-05-16 11:07:07 +00:00
< pre style = "padding: 1em 1em 1em 1em; width: 62.5em;background-color: #f0f0f0 " >
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bool < a href = '#SkMatrix_notequal_operator' > operator!=< / a > (const < a href = 'SkMatrix_Reference#SkMatrix' > SkMatrix< / a > & a, const < a href = 'SkMatrix_Reference#SkMatrix' > SkMatrix< / a > & b)
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< / pre >
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Compares < a href = '#SkMatrix_notequal_operator_a' > a< / a > and < a href = '#SkMatrix_notequal_operator_b' > b< / a > ; returns true if < a href = '#SkMatrix_notequal_operator_a' > a< / a > and < a href = '#SkMatrix_notequal_operator_b' > b< / a > are not numerically equal. Returns false
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even if sign of zero values are different. Returns true if either < a href = 'SkMatrix_Reference#SkMatrix' > SkMatrix< / a >
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contains NaN, even if the other < a href = 'SkMatrix_Reference#SkMatrix' > SkMatrix< / a > also contains NaN.
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### Parameters
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< table > < tr > < td > < a name = 'SkMatrix_notequal_operator_a' > < code > < strong > a< / strong > < / code > < / a > < / td >
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< td > < a href = 'SkMatrix_Reference#SkMatrix' > SkMatrix< / a > to compare< / td >
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< / tr >
< tr > < td > < a name = 'SkMatrix_notequal_operator_b' > < code > < strong > b< / strong > < / code > < / a > < / td >
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< td > < a href = 'SkMatrix_Reference#SkMatrix' > SkMatrix< / a > to compare< / td >
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< / tr >
< / table >
### Return Value
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true if < a href = 'SkMatrix_Reference#SkMatrix' > SkMatrix< / a > < a href = '#SkMatrix_notequal_operator_a' > a< / a > and < a href = 'SkMatrix_Reference#SkMatrix' > SkMatrix< / a > < a href = '#SkMatrix_notequal_operator_b' > b< / a > are numerically not equal
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### Example
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< div > < fiddle-embed name = "@Matrix_notequal_operator" > < / fiddle-embed > < / div >
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### See Also
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< a href = '#SkMatrix_cheapEqualTo' > cheapEqualTo< / a > < a href = '#SkMatrix_equal_operator' > operator==< / a > (const < a href = 'SkMatrix_Reference#SkMatrix' > SkMatrix< / a > & < a href = '#SkMatrix_notequal_operator_a' > a< / a > , const < a href = 'SkMatrix_Reference#SkMatrix' > SkMatrix< / a > & < a href = '#SkMatrix_notequal_operator_b' > b< / a > )
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< a name = 'Utility' > < / a >
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< a name = 'SkMatrix_dump' > < / a >
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---
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< pre style = "padding: 1em 1em 1em 1em; width: 62.5em;background-color: #f0f0f0 " >
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void < a href = '#SkMatrix_dump' > dump()< / a > const
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< / pre >
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Writes < a href = 'undocumented#Text' > text< / a > representation of < a href = 'SkMatrix_Reference#SkMatrix' > SkMatrix< / a > to standard output. Floating < a href = 'SkPoint_Reference#Point' > point< / a > values
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are written with limited precision; it may not be possible to reconstruct
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original < a href = 'SkMatrix_Reference#SkMatrix' > SkMatrix< / a > from output.
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### Example
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< div > < fiddle-embed name = "@Matrix_dump" >
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#### Example Output
~~~~
[ 0.7071 -0.7071 0.0000][ 0.7071 0.7071 0.0000][ 0.0000 0.0000 1.0000]
[ 0.7071 -0.7071 0.0000][ 0.7071 0.7071 0.0000][ 0.0000 0.0000 1.0000]
matrix != nearlyEqual
~~~~
< / fiddle-embed > < / div >
### See Also
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< a href = 'SkPath_Reference#SkPath' > SkPath< / a > ::< a href = '#SkPath_dump' > dump< / a >
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< a name = 'SkMatrix_getMinScale' > < / a >
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---
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< pre style = "padding: 1em 1em 1em 1em; width: 62.5em;background-color: #f0f0f0 " >
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< a href = 'undocumented#SkScalar' > SkScalar< / a > < a href = '#SkMatrix_getMinScale' > getMinScale< / a > ()const
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< / pre >
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Returns the minimum scaling factor of < a href = 'SkMatrix_Reference#SkMatrix' > SkMatrix< / a > by decomposing the scaling and
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skewing elements.
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Returns -1 if scale factor overflows or < a href = 'SkMatrix_Reference#SkMatrix' > SkMatrix< / a > contains perspective.
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### Return Value
minimum scale factor
### Example
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< div > < fiddle-embed name = "@Matrix_getMinScale" >
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#### Example Output
~~~~
matrix.getMinScale() 24
~~~~
< / fiddle-embed > < / div >
### See Also
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< a href = '#SkMatrix_getMaxScale' > getMaxScale< / a > < a href = '#SkMatrix_getMinMaxScales' > getMinMaxScales< / a >
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< a name = 'SkMatrix_getMaxScale' > < / a >
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---
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< pre style = "padding: 1em 1em 1em 1em; width: 62.5em;background-color: #f0f0f0 " >
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< a href = 'undocumented#SkScalar' > SkScalar< / a > < a href = '#SkMatrix_getMaxScale' > getMaxScale< / a > ()const
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< / pre >
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Returns the maximum scaling factor of < a href = 'SkMatrix_Reference#SkMatrix' > SkMatrix< / a > by decomposing the scaling and
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skewing elements.
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Returns -1 if scale factor overflows or < a href = 'SkMatrix_Reference#SkMatrix' > SkMatrix< / a > contains perspective.
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### Return Value
maximum scale factor
### Example
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< div > < fiddle-embed name = "@Matrix_getMaxScale" >
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#### Example Output
~~~~
matrix.getMaxScale() 42
~~~~
< / fiddle-embed > < / div >
### See Also
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< a href = '#SkMatrix_getMinScale' > getMinScale< / a > < a href = '#SkMatrix_getMinMaxScales' > getMinMaxScales< / a >
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< a name = 'SkMatrix_getMinMaxScales' > < / a >
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---
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< pre style = "padding: 1em 1em 1em 1em; width: 62.5em;background-color: #f0f0f0 " >
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bool < a href = '#SkMatrix_getMinMaxScales' > getMinMaxScales< / a > (< a href = 'undocumented#SkScalar' > SkScalar< / a > scaleFactors[2])const
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< / pre >
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Sets < a href = '#SkMatrix_getMinMaxScales_scaleFactors' > scaleFactors< / a > [0] to the minimum scaling factor, and < a href = '#SkMatrix_getMinMaxScales_scaleFactors' > scaleFactors< / a > [1] to the
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maximum scaling factor. Scaling factors are computed by decomposing
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the < a href = 'SkMatrix_Reference#SkMatrix' > SkMatrix< / a > scaling and skewing elements.
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Returns true if < a href = '#SkMatrix_getMinMaxScales_scaleFactors' > scaleFactors< / a > are found; otherwise, returns false and sets
< a href = '#SkMatrix_getMinMaxScales_scaleFactors' > scaleFactors< / a > to undefined values.
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### Parameters
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< table > < tr > < td > < a name = 'SkMatrix_getMinMaxScales_scaleFactors' > < code > < strong > scaleFactors< / strong > < / code > < / a > < / td >
< td > storage for minimum and maximum scale factors< / td >
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< / tr >
< / table >
### Return Value
true if scale factors were computed correctly
### Example
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< div > < fiddle-embed name = "@Matrix_getMinMaxScales" >
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#### Example Output
~~~~
matrix.getMinMaxScales() false 2 2
~~~~
< / fiddle-embed > < / div >
### See Also
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< a href = '#SkMatrix_getMinScale' > getMinScale< / a > < a href = '#SkMatrix_getMaxScale' > getMaxScale< / a >
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2018-05-16 11:07:07 +00:00
< a name = 'SkMatrix_decomposeScale' > < / a >
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---
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2018-05-16 11:07:07 +00:00
< pre style = "padding: 1em 1em 1em 1em; width: 62.5em;background-color: #f0f0f0 " >
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bool < a href = '#SkMatrix_decomposeScale' > decomposeScale< / a > (< a href = 'undocumented#SkSize' > SkSize< / a > * scale, < a href = 'SkMatrix_Reference#SkMatrix' > SkMatrix< / a > * remaining = nullptr)const
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< / pre >
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Decomposes < a href = 'SkMatrix_Reference#Matrix' > Matrix< / a > into < a href = '#SkMatrix_decomposeScale_scale' > scale< / a > components and whatever remains. Returns false if
< a href = 'SkMatrix_Reference#Matrix' > Matrix< / a > could not be decomposed.
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Sets < a href = '#SkMatrix_decomposeScale_scale' > scale< / a > to portion of < a href = 'SkMatrix_Reference#Matrix' > Matrix< / a > that < a href = '#SkMatrix_decomposeScale_scale' > scale< / a > axes. Sets < a href = '#SkMatrix_decomposeScale_remaining' > remaining< / a > to < a href = 'SkMatrix_Reference#Matrix' > Matrix< / a >
with scaling factored out. < a href = '#SkMatrix_decomposeScale_remaining' > remaining< / a > may be passed as nullptr
to determine if < a href = 'SkMatrix_Reference#Matrix' > Matrix< / a > can be decomposed without computing remainder.
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Returns true if < a href = '#SkMatrix_decomposeScale_scale' > scale< / a > components are found. < a href = '#SkMatrix_decomposeScale_scale' > scale< / a > and < a href = '#SkMatrix_decomposeScale_remaining' > remaining< / a > are
unchanged if < a href = 'SkMatrix_Reference#Matrix' > Matrix< / a > contains perspective; < a href = '#SkMatrix_decomposeScale_scale' > scale< / a > factors are not finite, or
are nearly zero.
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On success: < code > < a href = 'SkMatrix_Reference#Matrix' > Matrix< / a > = < a href = '#SkMatrix_decomposeScale_scale' > scale< / a > * Remaining< / code > .
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### Parameters
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< table > < tr > < td > < a name = 'SkMatrix_decomposeScale_scale' > < code > < strong > scale< / strong > < / code > < / a > < / td >
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< td > axes scaling factors; may be nullptr< / td >
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< / tr >
< tr > < td > < a name = 'SkMatrix_decomposeScale_remaining' > < code > < strong > remaining< / strong > < / code > < / a > < / td >
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< td > < a href = 'SkMatrix_Reference#Matrix' > Matrix< / a > without scaling; may be nullptr< / td >
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< / tr >
< / table >
### Return Value
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true if < a href = '#SkMatrix_decomposeScale_scale' > scale< / a > can be computed
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### Example
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< div > < fiddle-embed name = "@Matrix_decomposeScale" >
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#### Example Output
~~~~
[ 0.0000 -0.2500 0.0000][ 0.5000 0.0000 0.0000][ 0.0000 0.0000 1.0000]
success: true scale: 0.5, 0.25
[ 0.0000 -0.5000 0.0000][ 2.0000 0.0000 0.0000][ 0.0000 0.0000 1.0000]
[ 0.0000 -0.2500 0.0000][ 0.5000 0.0000 0.0000][ 0.0000 0.0000 1.0000]
~~~~
< / fiddle-embed > < / div >
### See Also
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< a href = '#SkMatrix_setScale' > setScale< / a > < a href = '#SkMatrix_MakeScale' > MakeScale< / a >
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< a name = 'SkMatrix_I' > < / a >
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---
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2018-05-16 11:07:07 +00:00
< pre style = "padding: 1em 1em 1em 1em; width: 62.5em;background-color: #f0f0f0 " >
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static const < a href = 'SkMatrix_Reference#SkMatrix' > SkMatrix< / a > & < a href = '#SkMatrix_I' > I< / a > ()
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< / pre >
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Returns reference to const identity < a href = 'SkMatrix_Reference#SkMatrix' > SkMatrix< / a > . Returned < a href = 'SkMatrix_Reference#SkMatrix' > SkMatrix< / a > is set to:
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| 1 0 0 |
| 0 1 0 |
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| 0 0 1 |
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### Return Value
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const identity < a href = 'SkMatrix_Reference#SkMatrix' > SkMatrix< / a >
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### Example
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< div > < fiddle-embed name = "@Matrix_I" >
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#### Example Output
~~~~
m1 == m2
m2 == m3
~~~~
< / fiddle-embed > < / div >
### See Also
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< a href = '#SkMatrix_reset' > reset()< / a > < a href = '#SkMatrix_setIdentity' > setIdentity< / a >
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< a name = 'SkMatrix_InvalidMatrix' > < / a >
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---
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2018-05-16 11:07:07 +00:00
< pre style = "padding: 1em 1em 1em 1em; width: 62.5em;background-color: #f0f0f0 " >
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static const < a href = 'SkMatrix_Reference#SkMatrix' > SkMatrix< / a > & < a href = '#SkMatrix_InvalidMatrix' > InvalidMatrix< / a > ()
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< / pre >
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Returns reference to a const < a href = 'SkMatrix_Reference#SkMatrix' > SkMatrix< / a > with invalid values. Returned < a href = 'SkMatrix_Reference#SkMatrix' > SkMatrix< / a > is set
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to:
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| < a href = 'undocumented#SK_ScalarMax' > SK_ScalarMax< / a > < a href = 'undocumented#SK_ScalarMax' > SK_ScalarMax< / a > < a href = 'undocumented#SK_ScalarMax' > SK_ScalarMax< / a > |
| < a href = 'undocumented#SK_ScalarMax' > SK_ScalarMax< / a > < a href = 'undocumented#SK_ScalarMax' > SK_ScalarMax< / a > < a href = 'undocumented#SK_ScalarMax' > SK_ScalarMax< / a > |
| < a href = 'undocumented#SK_ScalarMax' > SK_ScalarMax< / a > < a href = 'undocumented#SK_ScalarMax' > SK_ScalarMax< / a > < a href = 'undocumented#SK_ScalarMax' > SK_ScalarMax< / a > |
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### Return Value
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const invalid < a href = 'SkMatrix_Reference#SkMatrix' > SkMatrix< / a >
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### Example
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< div > < fiddle-embed name = "@Matrix_InvalidMatrix" >
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#### Example Output
~~~~
scaleX 3.40282e+38
~~~~
< / fiddle-embed > < / div >
### See Also
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< a href = '#SkMatrix_getType' > getType< / a >
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2018-05-16 11:07:07 +00:00
< a name = 'SkMatrix_Concat' > < / a >
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---
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2018-05-16 11:07:07 +00:00
< pre style = "padding: 1em 1em 1em 1em; width: 62.5em;background-color: #f0f0f0 " >
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static < a href = 'SkMatrix_Reference#SkMatrix' > SkMatrix< / a > < a href = '#SkMatrix_Concat' > Concat< / a > (const < a href = 'SkMatrix_Reference#SkMatrix' > SkMatrix< / a > & a, const < a href = 'SkMatrix_Reference#SkMatrix' > SkMatrix< / a > & b)
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< / pre >
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Returns < a href = 'SkMatrix_Reference#SkMatrix' > SkMatrix< / a > < a href = '#SkMatrix_Concat_a' > a< / a > multiplied by < a href = 'SkMatrix_Reference#SkMatrix' > SkMatrix< / a > < a href = '#SkMatrix_Concat_b' > b< / a > .
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Given:
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| A B C | | J K L |
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< a href = '#SkMatrix_Concat_a' > a< / a > = | D E F |, < a href = '#SkMatrix_Concat_b' > b< / a > = | M N O |
| G H < a href = '#SkMatrix_I' > I< / a > | | P Q R |
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sets < a href = 'SkMatrix_Reference#SkMatrix' > SkMatrix< / a > to:
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| A B C | | J K L | | AJ+BM+CP AK+BN+CQ AL+BO+CR |
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< a href = '#SkMatrix_Concat_a' > a</ a > * <a href='#SkMatrix_Concat_b'>b</a> = | D E F | * | M N O | = | DJ+EM+FP DK+EN+FQ DL+EO+FR |
| G H < a href = '#SkMatrix_I' > I< / a > | | P Q R | | GJ+HM+IP GK+HN+IQ GL+HO+IR |
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### Parameters
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< table > < tr > < td > < a name = 'SkMatrix_Concat_a' > < code > < strong > a< / strong > < / code > < / a > < / td >
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< td > < a href = 'SkMatrix_Reference#SkMatrix' > SkMatrix< / a > on left side of multiply expression< / td >
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< / tr >
< tr > < td > < a name = 'SkMatrix_Concat_b' > < code > < strong > b< / strong > < / code > < / a > < / td >
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< td > < a href = 'SkMatrix_Reference#SkMatrix' > SkMatrix< / a > on right side of multiply expression< / td >
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< / tr >
< / table >
### Return Value
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< a href = 'SkMatrix_Reference#SkMatrix' > SkMatrix< / a > computed from < a href = '#SkMatrix_Concat_a' > a< / a > times < a href = '#SkMatrix_Concat_b' > b< / a >
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### Example
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< div > < fiddle-embed name = "@Matrix_Concat" > < div > < a href = '#SkMatrix_setPolyToPoly' > setPolyToPoly< / a > creates perspective < a href = 'SkMatrix_Reference#Matrix' > matrices< / a > , one the inverse of the other.
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Multiplying the < a href = 'SkMatrix_Reference#Matrix' > matrix< / a > by its inverse turns into an identity < a href = 'SkMatrix_Reference#Matrix' > matrix< / a > .
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< / div > < / fiddle-embed > < / div >
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### See Also
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< a href = '#SkMatrix_preConcat' > preConcat< / a > < a href = '#SkMatrix_postConcat' > postConcat< / a >
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2018-05-16 11:07:07 +00:00
< a name = 'SkMatrix_dirtyMatrixTypeCache' > < / a >
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---
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2018-05-16 11:07:07 +00:00
< pre style = "padding: 1em 1em 1em 1em; width: 62.5em;background-color: #f0f0f0 " >
void < a href = '#SkMatrix_dirtyMatrixTypeCache' > dirtyMatrixTypeCache< / a > ()
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< / pre >
2018-01-04 21:11:51 +00:00
Sets internal cache to unknown state. Use to force update after repeated
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modifications to < a href = 'SkMatrix_Reference#SkMatrix' > SkMatrix< / a > element reference returned by < a href = '#SkMatrix_array1_operator' > operator[]< / a > (int index).
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### Example
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< div > < fiddle-embed name = "@Matrix_dirtyMatrixTypeCache" >
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#### Example Output
~~~~
with identity matrix: x = 24
after skew x mod: x = 24
after 2nd skew x mod: x = 24
after dirty cache: x = 66
~~~~
< / fiddle-embed > < / div >
### See Also
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< a href = '#SkMatrix_array1_operator' > operator[]< / a > (int index) < a href = '#SkMatrix_getType' > getType< / a >
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2018-05-16 11:07:07 +00:00
< a name = 'SkMatrix_setScaleTranslate' > < / a >
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---
2017-10-26 11:58:48 +00:00
2018-05-16 11:07:07 +00:00
< pre style = "padding: 1em 1em 1em 1em; width: 62.5em;background-color: #f0f0f0 " >
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void < a href = '#SkMatrix_setScaleTranslate' > setScaleTranslate< / a > (< a href = 'undocumented#SkScalar' > SkScalar< / a > sx, < a href = 'undocumented#SkScalar' > SkScalar< / a > sy, < a href = 'undocumented#SkScalar' > SkScalar< / a > tx, < a href = 'undocumented#SkScalar' > SkScalar< / a > ty)
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< / pre >
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Initializes < a href = 'SkMatrix_Reference#SkMatrix' > SkMatrix< / a > with scale and translate elements.
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| < a href = '#SkMatrix_setScaleTranslate_sx' > sx< / a > 0 < a href = '#SkMatrix_setScaleTranslate_tx' > tx< / a > |
| 0 < a href = '#SkMatrix_setScaleTranslate_sy' > sy< / a > < a href = '#SkMatrix_setScaleTranslate_ty' > ty< / a > |
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| 0 0 1 |
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### Parameters
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< table > < tr > < td > < a name = 'SkMatrix_setScaleTranslate_sx' > < code > < strong > sx< / strong > < / code > < / a > < / td >
< td > horizontal scale factor to store< / td >
< / tr >
< tr > < td > < a name = 'SkMatrix_setScaleTranslate_sy' > < code > < strong > sy< / strong > < / code > < / a > < / td >
< td > vertical scale factor to store< / td >
< / tr >
< tr > < td > < a name = 'SkMatrix_setScaleTranslate_tx' > < code > < strong > tx< / strong > < / code > < / a > < / td >
< td > horizontal translation to store< / td >
< / tr >
< tr > < td > < a name = 'SkMatrix_setScaleTranslate_ty' > < code > < strong > ty< / strong > < / code > < / a > < / td >
< td > vertical translation to store< / td >
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< / tr >
< / table >
### Example
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< div > < fiddle-embed name = "@Matrix_setScaleTranslate" >
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#### Example Output
~~~~
[ 1.0000 0.0000 3.0000][ 0.0000 2.0000 4.0000][ 0.0000 0.0000 1.0000]
~~~~
< / fiddle-embed > < / div >
### See Also
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< a href = '#SkMatrix_setScale' > setScale< / a > < a href = '#SkMatrix_preTranslate' > preTranslate< / a > < a href = '#SkMatrix_postTranslate' > postTranslate< / a >
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< a name = 'SkMatrix_isFinite' > < / a >
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---
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< pre style = "padding: 1em 1em 1em 1em; width: 62.5em;background-color: #f0f0f0 " >
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bool < a href = '#SkMatrix_isFinite' > isFinite< / a > ()const
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< / pre >
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Returns true if all elements of the < a href = 'SkMatrix_Reference#Matrix' > matrix< / a > are finite. Returns false if any
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element is infinity, or NaN.
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### Return Value
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true if < a href = 'SkMatrix_Reference#Matrix' > matrix< / a > has only finite elements
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### Example
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< div > < fiddle-embed name = "@Matrix_isFinite" >
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#### Example Output
~~~~
[ 1.0000 0.0000 nan][ 0.0000 1.0000 0.0000][ 0.0000 0.0000 1.0000]
matrix is finite: false
matrix != matrix
~~~~
< / fiddle-embed > < / div >
### See Also
operator==
