7fc1d12e67
All functions should have descriptions, examples, cross-references. References and spelling have been checked. More work to do creating and organizing topics. Docs-Preview: https://skia.org/?cl=56140 Tbr: caryclark@google.com Bug: skia:6898 Change-Id: I9d1e55d04ab64874c33cac8b91534aa192c2f545 Reviewed-on: https://skia-review.googlesource.com/56140 Reviewed-by: Cary Clark <caryclark@skia.org> Commit-Queue: Cary Clark <caryclark@skia.org>
2358 lines
70 KiB
Plaintext
2358 lines
70 KiB
Plaintext
#Topic Rect
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#Alias Rects
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#Alias Rect_Reference
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#Struct SkRect
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SkRect holds four SkScalar coordinates describing the upper and
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lower bounds of a rectangle. SkRect may be created from outer bounds or
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from position, width, and height. SkRect describes an area; if its right
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is less than or equal to its left, or if its bottom is less than or equal to
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its top, it is considered empty.
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# move to topic about MakeIWH and friends
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SkRect can be constructed from int values to avoid compiler warnings that
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integer input cannot convert to SkScalar without loss of precision.
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#Topic Overview
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#Subtopic Subtopics
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#ToDo manually add subtopics ##
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#Table
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#Legend
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# topics # description ##
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#Legend ##
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#Table ##
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##
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#Subtopic Operators
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#Table
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#Legend
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# description # function ##
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#Legend ##
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# friend bool operator!=(const SkRect& a, const SkRect& b) # Returns true if member bits are unequal. ##
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# friend bool operator==(const SkRect& a, const SkRect& b) # Returns true if member bits are equal. ##
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#Table ##
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#Subtopic ##
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#Subtopic Member_Functions
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#Table
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#Legend
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# description # function ##
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#Legend ##
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# Intersects # Returns true if areas overlap. ##
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# Make # Constructs from ISize returning (0, 0, width, height). ##
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# MakeEmpty # Constructs from bounds of (0, 0, 0, 0). ##
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# MakeFromIRect # Deprecated. ##
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# MakeIWH # Constructs from int input returning (0, 0, width, height). ##
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# MakeLTRB # Constructs from SkScalar left, top, right, bottom. ##
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# MakeLargest # Constructs (SK_ScalarMin, SK_ScalarMin, SK_ScalarMax, SK_ScalarMax). ##
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# MakeSize # Constructs from Size returning (0, 0, width, height). ##
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# MakeWH # Constructs from SkScalar input returning (0, 0, width, height). ##
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# MakeXYWH # Constructs from SkScalar input returning (x, y, width, height). ##
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# asScalars # Returns pointer to members as array. ##
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# bottom() # Returns larger bounds in y, if sorted. ##
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# centerX # Returns midpoint in x. ##
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# centerY # Returns midpoint in y. ##
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# contains() # Returns true if points are equal or inside. ##
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# dump() # Sends text representation using floats to standard output. ##
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# dumpHex # Sends text representation using hexadecimal to standard output. ##
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# growToInclude # Sets to union of bounds and one or more Points. ##
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# height # Returns span in y. ##
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# inset() # Moves the sides symmetrically about the center. ##
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# intersect() # Sets to shared area; returns true if not empty. ##
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# intersects() # Returns true if areas overlap. ##
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# isEmpty # Returns true if width or height are zero or negative. ##
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# isFinite # Returns true if no member is infinite or NaN. ##
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# isLargest # Returns equal to (SK_ScalarMin, SK_ScalarMin, SK_ScalarMax, SK_ScalarMax). ##
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# isSorted # Returns true if width or height are zero or positive. ##
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# iset() # Sets to int input (left, top, right, bottom). ##
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# isetWH # Sets to int input (0, 0, width, height). ##
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# join() # Sets to union of bounds. ##
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# joinNonEmptyArg # Sets to union of bounds, asserting that argument is not empty. ##
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# joinPossiblyEmptyRect # Sets to union of bounds. Skips empty check for both. ##
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# left() # Returns smaller bounds in x, if sorted. ##
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# makeInset # Constructs from sides moved symmetrically about the center. ##
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# makeOffset # Constructs from translated sides. ##
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# makeOutset # Constructs from sides moved symmetrically about the center. ##
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# makeSorted # Constructs, ordering sides from smaller to larger. ##
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# offset() # Translates sides without changing width and height. ##
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# offsetTo # Translates to (x, y) without changing width and height. ##
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# outset() # Moves the sides symmetrically about the center. ##
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# right() # Returns larger bounds in x, if sorted. ##
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# round() # Sets members to nearest integer value. ##
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# roundIn # Sets members to nearest integer value towards opposite. ##
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# roundOut # Sets members to nearest integer value away from opposite. ##
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# set() # Sets to SkScalar input (left, top, right, bottom) and others. ##
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# setBounds # Sets to upper and lower limits of Point array. ##
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# setBoundsCheck # Sets to upper and lower limits of Point array. ##
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# setEmpty # Sets to (0, 0, 0, 0). ##
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# setLTRB # Sets to SkScalar input (left, top, right, bottom). ##
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# setLargest # Sets to (SK_ScalarMin, SK_ScalarMin, SK_ScalarMax, SK_ScalarMax). ##
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# setLargestInverted # Sets to (SK_ScalarMax, SK_ScalarMax, SK_ScalarMin, SK_ScalarMin). ##
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# setWH # Sets to SkScalar input (0, 0, width, height). ##
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# setXYWH # Sets to SkScalar input (x, y, width, height). ##
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# sort() # Orders sides from smaller to larger. ##
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# toQuad # Returns four corners as Point. ##
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# top() # Returns smaller bounds in y, if sorted. ##
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# width() # Returns span in x. ##
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# x() # Returns bounds left. ##
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# y() # Returns bounds top. ##
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#Table ##
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#Subtopic ##
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#Topic ##
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#Member SkScalar fLeft
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May contain any value, including infinities and NaN. The smaller of the
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horizontal values when sorted. When equal to or greater than fRight, Rect is empty.
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##
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#Member SkScalar fTop
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May contain any value, including infinities and NaN. The smaller of the
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vertical values when sorted. When equal to or greater than fBottom, Rect is empty.
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##
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#Member SkScalar fRight
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May contain any value, including infinities and NaN. The larger of the
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horizontal values when sorted. When equal to or less than fLeft, Rect is empty.
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##
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#Member SkScalar fBottom
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May contain any value, including infinities and NaN. The larger of the
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vertical values when sorted. When equal to or less than fTop, Rect is empty.
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##
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# ------------------------------------------------------------------------------
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#Method static constexpr SkRect SK_WARN_UNUSED_RESULT MakeEmpty()
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Returns constructed Rect set to (0, 0, 0, 0).
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Many other rectangles are empty; if left is equal to or greater than right,
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or if top is equal to or greater than bottom. Setting all members to zero
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is a convenience, but does not designate a special empty rectangle.
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#Return bounds (0, 0, 0, 0) ##
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#Example
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SkRect rect = SkRect::MakeEmpty();
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SkDebugf("MakeEmpty isEmpty: %s\n", rect.isEmpty() ? "true" : "false");
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rect.offset(10, 10);
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SkDebugf("offset rect isEmpty: %s\n", rect.isEmpty() ? "true" : "false");
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rect.inset(10, 10);
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SkDebugf("inset rect isEmpty: %s\n", rect.isEmpty() ? "true" : "false");
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rect.outset(20, 20);
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SkDebugf("outset rect isEmpty: %s\n", rect.isEmpty() ? "true" : "false");
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#StdOut
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MakeEmpty isEmpty: true
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offset rect isEmpty: true
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inset rect isEmpty: true
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outset rect isEmpty: false
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##
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##
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#SeeAlso isEmpty setEmpty setLargestInverted SkIRect::MakeEmpty
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##
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# ------------------------------------------------------------------------------
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#Method static SkRect SK_WARN_UNUSED_RESULT MakeLargest()
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Returns constructed Rect setting left and top to most negative finite value, and
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setting right and bottom to most positive finite value.
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#Return bounds (SK_ScalarMin, SK_ScalarMin, SK_ScalarMax, SK_ScalarMax) ##
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#Example
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SkRect rect = SkRect::MakeLargest();
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SkDebugf("MakeLargest isLargest: %s\n", rect.isLargest() ? "true" : "false");
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SkDebugf("MakeLargest isFinite: %s\n", rect.isFinite() ? "true" : "false");
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rect.outset(1e31, 1e31);
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SkDebugf("outset a little isLargest: %s\n", rect.isLargest() ? "true" : "false");
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SkDebugf("outset a little isFinite: %s\n", rect.isFinite() ? "true" : "false");
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rect.outset(1e32, 1e32);
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SkDebugf("outset a little more isLargest: %s\n", rect.isLargest() ? "true" : "false");
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SkDebugf("outset a little more isFinite: %s\n", rect.isFinite() ? "true" : "false");
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#StdOut
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MakeLargest isLargest: true
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MakeLargest isFinite: true
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outset a little isLargest: true
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outset a little isFinite: true
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outset a little more isLargest: false
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outset a little more isFinite: false
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##
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##
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#SeeAlso isLargest setLargest SkIRect::MakeLargest
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##
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# ------------------------------------------------------------------------------
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#Method static SkRect SK_WARN_UNUSED_RESULT MakeWH(SkScalar w, SkScalar h)
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Returns constructed Rect set to SkScalar values (0, 0, w, h). Does not
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validate input; w or h may be negative.
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Passing integer values may generate a compiler warning since Rect cannot
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represent 32-bit integers exactly. Use SkIRect for an exact integer rectangle.
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#Param w SkScalar width of constructed Rect ##
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#Param h SkScalar height of constructed Rect ##
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#Return bounds (0, 0, w, h) ##
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#Example
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SkRect rect1 = SkRect::MakeWH(25, 35);
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SkRect rect2 = SkRect::MakeIWH(25, 35);
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SkRect rect3 = SkRect::MakeXYWH(0, 0, 25, 35);
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SkRect rect4 = SkRect::MakeLTRB(0, 0, 25, 35);
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SkDebugf("all %s" "equal\n", rect1 == rect2 && rect2 == rect3 && rect3 == rect4 ?
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"" : "not ");
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#StdOut
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all equal
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##
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##
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#SeeAlso MakeSize MakeXYWH MakeIWH setWH SkIRect::MakeWH
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##
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# ------------------------------------------------------------------------------
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#Method static SkRect SK_WARN_UNUSED_RESULT MakeIWH(int w, int h)
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Returns constructed Rect set to integer values (0, 0, w, h). Does not validate
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input; w or h may be negative.
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Use to avoid a compiler warning that input may lose precision when stored.
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Use SkIRect for an exact integer rectangle.
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#Param w integer width of constructed Rect ##
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#Param h integer height of constructed Rect ##
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#Return bounds (0, 0, w, h) ##
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#Example
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SkIRect i_rect = SkIRect::MakeWH(25, 35);
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SkRect f_rect = SkRect::MakeIWH(25, 35);
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SkDebugf("i_rect width: %d f_rect width:%g\n", i_rect.width(), f_rect.width());
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i_rect = SkIRect::MakeWH(125000111, 0);
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f_rect = SkRect::MakeIWH(125000111, 0);
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SkDebugf("i_rect width: %d f_rect width:%.0f\n", i_rect.width(), f_rect.width());
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#StdOut
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i_rect width: 25 f_rect width:25
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i_rect width: 125000111 f_rect width:125000112
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##
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##
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#SeeAlso MakeXYWH MakeWH isetWH SkIRect::MakeWH
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##
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# ------------------------------------------------------------------------------
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#Method static SkRect SK_WARN_UNUSED_RESULT MakeSize(const SkSize& size)
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Returns constructed Rect set to (0, 0, size.width(), size.height()). Does not
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validate input; size.width() or size.height() may be negative.
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#Param size SkScalar values for Rect width and height ##
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#Return bounds (0, 0, size.width(), size.height()) ##
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#Example
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SkSize size = {25.5f, 35.5f};
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SkRect rect = SkRect::MakeSize(size);
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SkDebugf("rect width: %g height: %g\n", rect.width(), rect.height());
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SkISize floor = size.toFloor();
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rect = SkRect::MakeSize(SkSize::Make(floor));
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SkDebugf("floor width: %g height: %g\n", rect.width(), rect.height());
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#StdOut
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rect width: 25.5 height: 35.5
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floor width: 25 height: 35
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##
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##
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#SeeAlso MakeWH MakeXYWH MakeIWH setWH SkIRect::MakeWH
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##
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# ------------------------------------------------------------------------------
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#Method static constexpr SkRect SK_WARN_UNUSED_RESULT MakeLTRB(SkScalar l, SkScalar t, SkScalar r,
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SkScalar b)
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Returns constructed Rect set to (l, t, r, b). Does not sort input; Rect may
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result in fLeft greater than fRight, or fTop greater than fBottom.
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#Param l SkScalar stored in fLeft ##
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#Param t SkScalar stored in fTop ##
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#Param r SkScalar stored in fRight ##
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#Param b SkScalar stored in fBottom ##
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#Return bounds (l, t, r, b) ##
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#Example
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SkRect rect = SkRect::MakeLTRB(5, 35, 15, 25);
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SkDebugf("rect: %g, %g, %g, %g isEmpty: %s\n", rect.left(), rect.top(), rect.right(),
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rect.bottom(), rect.isEmpty() ? "true" : "false");
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rect.sort();
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SkDebugf("rect: %g, %g, %g, %g isEmpty: %s\n", rect.left(), rect.top(), rect.right(),
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rect.bottom(), rect.isEmpty() ? "true" : "false");
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#StdOut
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rect: 5, 35, 15, 25 isEmpty: true
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rect: 5, 25, 15, 35 isEmpty: false
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##
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##
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#SeeAlso MakeXYWH SkIRect::MakeLTRB
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##
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# ------------------------------------------------------------------------------
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#Method static SkRect SK_WARN_UNUSED_RESULT MakeXYWH(SkScalar x, SkScalar y, SkScalar w, SkScalar h)
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Returns constructed Rect set to
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#Formula
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(x, y, x + w, y + h)
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##
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. Does not validate input;
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w or h may be negative.
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#Param x stored in fLeft ##
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#Param y stored in fTop ##
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#Param w added to x and stored in fRight ##
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#Param h added to y and stored in fBottom ##
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#Return bounds (x, y, x + w, y + h) ##
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#Example
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SkRect rect = SkRect::MakeXYWH(5, 35, -15, 25);
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SkDebugf("rect: %g, %g, %g, %g isEmpty: %s\n", rect.left(), rect.top(), rect.right(),
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rect.bottom(), rect.isEmpty() ? "true" : "false");
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rect.sort();
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SkDebugf("rect: %g, %g, %g, %g isEmpty: %s\n", rect.left(), rect.top(), rect.right(),
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rect.bottom(), rect.isEmpty() ? "true" : "false");
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#StdOut
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rect: 5, 35, -10, 60 isEmpty: true
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rect: -10, 35, 5, 60 isEmpty: false
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##
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##
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#SeeAlso MakeLTRB SkIRect::MakeXYWH
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##
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# ------------------------------------------------------------------------------
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#Method static SkRect SK_WARN_UNUSED_RESULT MakeFromIRect(const SkIRect& irect)
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Deprecated.
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#Deprecated
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##
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#Param irect integer rect ##
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#Return irect as SkRect ##
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#NoExample
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##
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#SeeAlso Make
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##
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# ------------------------------------------------------------------------------
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#Method static SkRect Make(const SkISize& size)
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Returns constructed IRect set to (0, 0, size.width(), size.height()).
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Does not validate input; size.width() or size.height() may be negative.
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#Param size integer values for Rect width and height ##
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#Return bounds (0, 0, size.width(), size.height()) ##
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#Example
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SkRect rect1 = SkRect::MakeSize({2, 35});
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SkRect rect2 = SkRect::MakeIWH(2, 35);
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SkDebugf("rect1 %c= rect2\n", rect1 == rect2 ? '=' : '!');
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#StdOut
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rect1 == rect2
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##
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##
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#SeeAlso MakeWH MakeXYWH SkRect::MakeIWH SkIRect::MakeSize
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##
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# ------------------------------------------------------------------------------
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#Method static SkRect SK_WARN_UNUSED_RESULT Make(const SkIRect& irect)
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Returns constructed IRect set to irect, promoting integers to Scalar.
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Does not validate input; fLeft may be greater than fRight, fTop may be greater
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than fBottom.
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#Param irect integer unsorted bounds ##
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#Return irect members converted to SkScalar ##
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#Example
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SkIRect i_rect1 = {2, 35, 22, 53};
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SkRect f_rect = SkRect::Make(i_rect1);
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f_rect.offset(0.49f, 0.49f);
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SkIRect i_rect2;
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f_rect.round(&i_rect2);
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SkDebugf("i_rect1 %c= i_rect2\n", i_rect1 == i_rect2? '=' : '!');
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##
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#SeeAlso MakeLTRB
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##
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# ------------------------------------------------------------------------------
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#Method bool isEmpty() const
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Returns true if fLeft is equal to or greater than fRight, or if fTop is equal
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to or greater than fBottom. Call sort() to reverse rectangles with negative
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width() or height().
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#Return true if width() or height() are zero or negative ##
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#Example
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SkRect tests[] = {{20, 40, 10, 50}, {20, 40, 20, 50}};
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for (auto rect : tests) {
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SkDebugf("rect: {%g, %g, %g, %g} is" "%s empty\n", rect.left(), rect.top(), rect.right(),
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rect.bottom(), rect.isEmpty() ? "" : " not");
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rect.sort();
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SkDebugf("sorted: {%g, %g, %g, %g} is" "%s empty\n", rect.left(), rect.top(), rect.right(),
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rect.bottom(), rect.isEmpty() ? "" : " not");
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}
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#StdOut
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rect: {20, 40, 10, 50} is empty
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sorted: {10, 40, 20, 50} is not empty
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rect: {20, 40, 20, 50} is empty
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sorted: {20, 40, 20, 50} is empty
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##
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##
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#SeeAlso MakeEmpty sort SkIRect::isEmpty
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##
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# ------------------------------------------------------------------------------
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#Method bool isSorted() const
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Returns true if fLeft is equal to or less than fRight, or if fTop is equal
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to or less than fBottom. Call sort() to reverse rectangles with negative
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width() or height().
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#Return true if width() or height() are zero or positive ##
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#Example
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SkRect tests[] = {{20, 40, 10, 50}, {20, 40, 20, 50}};
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for (auto rect : tests) {
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SkDebugf("rect: {%g, %g, %g, %g} is" "%s sorted\n", rect.left(), rect.top(), rect.right(),
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rect.bottom(), rect.isSorted() ? "" : " not");
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rect.sort();
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SkDebugf("sorted: {%g, %g, %g, %g} is" "%s sorted\n", rect.left(), rect.top(), rect.right(),
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rect.bottom(), rect.isSorted() ? "" : " not");
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}
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#StdOut
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rect: {20, 40, 10, 50} is not sorted
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sorted: {10, 40, 20, 50} is sorted
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rect: {20, 40, 20, 50} is sorted
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sorted: {20, 40, 20, 50} is sorted
|
|
##
|
|
##
|
|
|
|
#SeeAlso sort makeSorted isEmpty
|
|
|
|
##
|
|
|
|
# ------------------------------------------------------------------------------
|
|
|
|
#Method bool isLargest() const
|
|
|
|
Returns true if Rect encloses largest possible area.
|
|
|
|
#Return true if equal to (SK_ScalarMin, SK_ScalarMin, SK_ScalarMax, SK_ScalarMax) ##
|
|
|
|
#Example
|
|
#Description
|
|
Note that the width cannot be represented as a 32-bit finite value.
|
|
##
|
|
SkRect large = SkRect::MakeLargest();
|
|
SkDebugf("large is largest: %s\n" ,large.isLargest() ? "true" : "false");
|
|
SkDebugf("large width %g\n", large.width());
|
|
SkDebugf("large is empty: %s\n", large.isEmpty() ? "true" : "false");
|
|
SkDebugf("large is sorted: %s\n", large.isSorted() ? "true" : "false");
|
|
SkDebugf("large is finite: %s\n", large.isFinite() ? "true" : "false");
|
|
#StdOut
|
|
large is largest: true
|
|
large width inf
|
|
large is empty: false
|
|
large is sorted: true
|
|
large is finite: true
|
|
##
|
|
##
|
|
|
|
#SeeAlso MakeLargest SkIRect::isLargest
|
|
|
|
##
|
|
|
|
# ------------------------------------------------------------------------------
|
|
|
|
#Method bool isFinite() const
|
|
|
|
Returns true if all values in the rectangle are finite: SK_ScalarMin or larger,
|
|
and SK_ScalarMax or smaller.
|
|
|
|
#Return true if no member is infinite or NaN ##
|
|
|
|
#Example
|
|
SkRect largest = SkRect::MakeLargest();
|
|
SkDebugf("largest is finite: %s\n", largest.isFinite() ? "true" : "false");
|
|
SkDebugf("large width %g\n", largest.width());
|
|
SkRect widest = SkRect::MakeWH(largest.width(), largest.height());
|
|
SkDebugf("widest is finite: %s\n", widest.isFinite() ? "true" : "false");
|
|
#StdOut
|
|
largest is finite: true
|
|
large width inf
|
|
widest is finite: false
|
|
##
|
|
##
|
|
|
|
#SeeAlso SkScalarIsFinite SkScalarIsNaN
|
|
|
|
##
|
|
|
|
# ------------------------------------------------------------------------------
|
|
|
|
#Method SkScalar x() const
|
|
|
|
Returns left edge of Rect, if sorted. Call isSorted to see if Rect is valid.
|
|
Call sort() to reverse fLeft and fRight if needed.
|
|
|
|
#Return fLeft ##
|
|
|
|
#Example
|
|
SkRect unsorted = { 15, 5, 10, 25 };
|
|
SkDebugf("unsorted.fLeft: %g unsorted.x(): %g\n", unsorted.fLeft, unsorted.x());
|
|
SkRect sorted = unsorted.makeSorted();
|
|
SkDebugf("sorted.fLeft: %g sorted.x(): %g\n", sorted.fLeft, sorted.x());
|
|
#StdOut
|
|
unsorted.fLeft: 15 unsorted.x(): 15
|
|
sorted.fLeft: 10 sorted.x(): 10
|
|
##
|
|
##
|
|
|
|
#SeeAlso fLeft left() y() SkIRect::x()
|
|
|
|
##
|
|
|
|
# ------------------------------------------------------------------------------
|
|
|
|
#Method SkScalar y() const
|
|
|
|
Returns top edge of Rect, if sorted. Call isEmpty to see if Rect may be invalid,
|
|
and sort() to reverse fTop and fBottom if needed.
|
|
|
|
#Return fTop ##
|
|
|
|
#Example
|
|
SkRect unsorted = { 15, 25, 10, 5 };
|
|
SkDebugf("unsorted.fTop: %g unsorted.y(): %g\n", unsorted.fTop, unsorted.y());
|
|
SkRect sorted = unsorted.makeSorted();
|
|
SkDebugf("sorted.fTop: %g sorted.y(): %g\n", sorted.fTop, sorted.y());
|
|
#StdOut
|
|
unsorted.fTop: 25 unsorted.y(): 25
|
|
sorted.fTop: 5 sorted.y(): 5
|
|
##
|
|
##
|
|
|
|
#SeeAlso fTop top() x() SkIRect::y()
|
|
|
|
##
|
|
|
|
# ------------------------------------------------------------------------------
|
|
|
|
#Method SkScalar left() const
|
|
|
|
Returns left edge of Rect, if sorted. Call isSorted to see if Rect is valid.
|
|
Call sort() to reverse fLeft and fRight if needed.
|
|
|
|
#Return fLeft ##
|
|
|
|
#Example
|
|
SkRect unsorted = { 15, 5, 10, 25 };
|
|
SkDebugf("unsorted.fLeft: %g unsorted.left(): %g\n", unsorted.fLeft, unsorted.left());
|
|
SkRect sorted = unsorted.makeSorted();
|
|
SkDebugf("sorted.fLeft: %g sorted.left(): %g\n", sorted.fLeft, sorted.left());
|
|
#StdOut
|
|
unsorted.fLeft: 15 unsorted.left(): 15
|
|
sorted.fLeft: 10 sorted.left(): 10
|
|
##
|
|
##
|
|
|
|
#SeeAlso fLeft x() SkIRect::left()
|
|
|
|
##
|
|
|
|
# ------------------------------------------------------------------------------
|
|
|
|
#Method SkScalar top() const
|
|
|
|
Returns top edge of Rect, if sorted. Call isEmpty to see if Rect may be invalid,
|
|
and sort() to reverse fTop and fBottom if needed.
|
|
|
|
#Return fTop ##
|
|
|
|
#Example
|
|
SkRect unsorted = { 15, 25, 10, 5 };
|
|
SkDebugf("unsorted.fTop: %g unsorted.top(): %g\n", unsorted.fTop, unsorted.top());
|
|
SkRect sorted = unsorted.makeSorted();
|
|
SkDebugf("sorted.fTop: %g sorted.top(): %g\n", sorted.fTop, sorted.top());
|
|
#StdOut
|
|
unsorted.fTop: 25 unsorted.top(): 25
|
|
sorted.fTop: 5 sorted.top(): 5
|
|
##
|
|
##
|
|
|
|
#SeeAlso fTop y() SkIRect::top()
|
|
|
|
##
|
|
|
|
# ------------------------------------------------------------------------------
|
|
|
|
#Method SkScalar right() const
|
|
|
|
Returns right edge of Rect, if sorted. Call isSorted to see if Rect is valid.
|
|
Call sort() to reverse fLeft and fRight if needed.
|
|
|
|
#Return fRight ##
|
|
|
|
#Example
|
|
SkRect unsorted = { 15, 25, 10, 5 };
|
|
SkDebugf("unsorted.fRight: %g unsorted.right(): %g\n", unsorted.fRight, unsorted.right());
|
|
SkRect sorted = unsorted.makeSorted();
|
|
SkDebugf("sorted.fRight: %g sorted.right(): %g\n", sorted.fRight, sorted.right());
|
|
#StdOut
|
|
unsorted.fRight: 10 unsorted.right(): 10
|
|
sorted.fRight: 15 sorted.right(): 15
|
|
##
|
|
##
|
|
|
|
#SeeAlso fRight SkIRect::right()
|
|
|
|
##
|
|
|
|
# ------------------------------------------------------------------------------
|
|
|
|
#Method SkScalar bottom() const
|
|
|
|
Returns bottom edge of Rect, if sorted. Call isEmpty to see if Rect may be invalid,
|
|
and sort() to reverse fTop and fBottom if needed.
|
|
|
|
#Return fBottom ##
|
|
|
|
#Example
|
|
SkRect unsorted = { 15, 25, 10, 5 };
|
|
SkDebugf("unsorted.fBottom: %g unsorted.bottom(): %g\n", unsorted.fBottom, unsorted.bottom());
|
|
SkRect sorted = unsorted.makeSorted();
|
|
SkDebugf("sorted.fBottom: %g sorted.bottom(): %g\n", sorted.fBottom, sorted.bottom());
|
|
#StdOut
|
|
unsorted.fBottom: 5 unsorted.bottom(): 5
|
|
sorted.fBottom: 25 sorted.bottom(): 25
|
|
##
|
|
##
|
|
|
|
#SeeAlso fBottom SkIRect::bottom()
|
|
|
|
##
|
|
|
|
# ------------------------------------------------------------------------------
|
|
|
|
#Method SkScalar width() const
|
|
|
|
Returns span on the x-axis. This does not check if Rect is sorted, or if
|
|
result fits in 32-bit float; result may be negative or infinity.
|
|
|
|
#Return fRight minus fLeft ##
|
|
|
|
#Example
|
|
#Description
|
|
Compare with SkIRect::width() example.
|
|
##
|
|
SkRect unsorted = { 15, 25, 10, 5 };
|
|
SkDebugf("unsorted width: %g\n", unsorted.width());
|
|
SkRect large = { -2147483647.f, 1, 2147483644.f, 2 };
|
|
SkDebugf("large width: %.0f\n", large.width());
|
|
#StdOut
|
|
unsorted width: -5
|
|
large width: 4294967296
|
|
##
|
|
##
|
|
|
|
#SeeAlso height() SkIRect::width()
|
|
|
|
##
|
|
|
|
# ------------------------------------------------------------------------------
|
|
|
|
#Method SkScalar height() const
|
|
|
|
Returns span on the y-axis. This does not check if IRect is sorted, or if
|
|
result fits in 32-bit float; result may be negative or infinity.
|
|
|
|
#Return fBottom minus fTop ##
|
|
|
|
#Example
|
|
#Description
|
|
Compare with SkIRect::height() example.
|
|
##
|
|
SkRect unsorted = { 15, 25, 10, 20 };
|
|
SkDebugf("unsorted height: %g\n", unsorted.height());
|
|
SkRect large = { 1, -2147483647.f, 2, 2147483644.f };
|
|
SkDebugf("large height: %.0f\n", large.height());
|
|
#StdOut
|
|
unsorted height: -5
|
|
large height: 4294967296
|
|
##
|
|
##
|
|
|
|
#SeeAlso width() SkIRect::height()
|
|
|
|
##
|
|
|
|
# ------------------------------------------------------------------------------
|
|
|
|
#Method SkScalar centerX() const
|
|
|
|
Returns average of left edge and right edge. Result does not change if Rect
|
|
is sorted. Result may overflow to infinity if Rect is far from the origin.
|
|
|
|
#Return midpoint in x ##
|
|
|
|
#Example
|
|
SkRect tests[] = {{20, 30, 41, 51}, {-20, -30, -41, -51}};
|
|
for (auto rect : tests) {
|
|
SkDebugf("left: %3g right: %3g centerX: %3g\n", rect.left(), rect.right(), rect.centerX());
|
|
rect.sort();
|
|
SkDebugf("left: %3g right: %3g centerX: %3g\n", rect.left(), rect.right(), rect.centerX());
|
|
}
|
|
#StdOut
|
|
left: 20 right: 41 centerX: 30.5
|
|
left: 20 right: 41 centerX: 30.5
|
|
left: -20 right: -41 centerX: -30.5
|
|
left: -41 right: -20 centerX: -30.5
|
|
##
|
|
##
|
|
|
|
#SeeAlso centerY SkIRect::centerX
|
|
|
|
##
|
|
|
|
# ------------------------------------------------------------------------------
|
|
|
|
#Method SkScalar centerY() const
|
|
|
|
Returns average of top edge and bottom edge. Result does not change if Rect
|
|
is sorted. Result may overflow to infinity if Rect is far from the origin.
|
|
|
|
#Return midpoint in y ##
|
|
|
|
#Example
|
|
SkRect rect = { 2e+38, 2e+38, 3e+38, 3e+38 };
|
|
SkDebugf("left: %g right: %g centerX: %g ", rect.left(), rect.right(), rect.centerX());
|
|
SkDebugf("safe mid x: %g\n", rect.left() / 2 + rect.right() / 2);
|
|
#StdOut
|
|
left: 2e+38 right: 3e+38 centerX: inf safe mid x: 2.5e+38
|
|
##
|
|
##
|
|
|
|
#SeeAlso centerX SkIRect::centerY
|
|
|
|
##
|
|
|
|
# ------------------------------------------------------------------------------
|
|
|
|
#Method friend bool operator==(const SkRect& a, const SkRect& b)
|
|
|
|
Returns true if all members in a: fLeft, fTop, fRight, and fBottom; are
|
|
equal to the corresponding members in b.
|
|
|
|
a and b are not equal if either contain NaN. a and b are equal if members
|
|
contain zeroes width different signs.
|
|
|
|
#Param a Rect to compare ##
|
|
#Param b Rect to compare ##
|
|
|
|
#Return true if members are equal ##
|
|
|
|
#Example
|
|
auto debugster = [](const SkRect& test) -> void {
|
|
SkRect negZero = {-0.0f, -0.0f, 2, 2};
|
|
SkDebugf("{%g, %g, %g, %g} %c= {%g, %g, %g, %g} %s numerically equal\n",
|
|
test.fLeft, test.fTop, test.fRight, test.fBottom,
|
|
negZero.fLeft, negZero.fTop, negZero.fRight, negZero.fBottom,
|
|
test == negZero ? '=' : '!',
|
|
test.fLeft == negZero.fLeft && test.fTop == negZero.fTop &&
|
|
test.fRight == negZero.fRight && test.fBottom == negZero.fBottom ?
|
|
"and are" : "yet are not");
|
|
};
|
|
SkRect tests[] = {{0, 0, 2, 2}, {-0, -0, 2, 2}, {0.0f, 0.0f, 2, 2}};
|
|
SkDebugf("tests are %s" "equal\n", tests[0] == tests[1] && tests[1] == tests[2] ? "" : "not ");
|
|
for (auto rect : tests) {
|
|
debugster(rect);
|
|
}
|
|
#StdOut
|
|
tests are equal
|
|
{0, 0, 2, 2} == {-0, -0, 2, 2} and are numerically equal
|
|
{0, 0, 2, 2} == {-0, -0, 2, 2} and are numerically equal
|
|
{0, 0, 2, 2} == {-0, -0, 2, 2} and are numerically equal
|
|
##
|
|
##
|
|
|
|
#SeeAlso operator!=(const SkRect& a, const SkRect& b)
|
|
|
|
##
|
|
|
|
# ------------------------------------------------------------------------------
|
|
|
|
#Method friend bool operator!=(const SkRect& a, const SkRect& b)
|
|
|
|
Returns true if any in a: fLeft, fTop, fRight, and fBottom; does not
|
|
equal the corresponding members in b.
|
|
|
|
a and b are not equal if either contain NaN. a and b are equal if members
|
|
contain zeroes width different signs.
|
|
|
|
#Param a Rect to compare ##
|
|
#Param b Rect to compare ##
|
|
|
|
#Return true if members are not equal ##
|
|
|
|
#Example
|
|
SkRect test = {0, 0, 2, SK_ScalarNaN};
|
|
SkDebugf("test with NaN is %s" "equal to itself\n", test == test ? "" : "not ");
|
|
#StdOut
|
|
test with NaN is not equal to itself
|
|
##
|
|
##
|
|
|
|
#SeeAlso operator==(const SkRect& a, const SkRect& b)
|
|
|
|
##
|
|
|
|
# ------------------------------------------------------------------------------
|
|
|
|
#Method void toQuad(SkPoint quad[4]) const
|
|
|
|
Returns four points in quad that enclose Rect ordered as: top-left, top-right,
|
|
bottom-right, bottom-left.
|
|
|
|
#Private
|
|
Consider adding param to control whether quad is CW or CCW.
|
|
##
|
|
|
|
#Param quad storage for corners of Rect ##
|
|
|
|
#Example
|
|
SkRect rect = {1, 2, 3, 4};
|
|
SkPoint corners[4];
|
|
rect.toQuad(corners);
|
|
SkDebugf("rect: {%g, %g, %g, %g}\n", rect.fLeft, rect.fTop, rect.fRight, rect.fBottom);
|
|
SkDebugf("corners:");
|
|
for (auto corner : corners) {
|
|
SkDebugf(" {%g, %g}", corner.fX, corner.fY);
|
|
}
|
|
SkDebugf("\n");
|
|
#StdOut
|
|
rect: {1, 2, 3, 4}
|
|
corners: {1, 2} {3, 2} {3, 4} {1, 4}
|
|
##
|
|
##
|
|
|
|
#SeeAlso SkPath::addRect
|
|
|
|
##
|
|
|
|
# ------------------------------------------------------------------------------
|
|
|
|
#Method void setEmpty()
|
|
|
|
Sets Rect to (0, 0, 0, 0).
|
|
|
|
Many other rectangles are empty; if left is equal to or greater than right,
|
|
or if top is equal to or greater than bottom. Setting all members to zero
|
|
is a convenience, but does not designate a special empty rectangle.
|
|
|
|
#Example
|
|
SkRect rect = {3, 4, 1, 2};
|
|
for (int i = 0; i < 2; ++i) {
|
|
SkDebugf("rect: {%g, %g, %g, %g} is %s" "empty\n", rect.fLeft, rect.fTop,
|
|
rect.fRight, rect.fBottom, rect.isEmpty() ? "" : "not ");
|
|
rect.setEmpty();
|
|
}
|
|
#StdOut
|
|
rect: {3, 4, 1, 2} is empty
|
|
rect: {0, 0, 0, 0} is empty
|
|
##
|
|
##
|
|
|
|
#SeeAlso MakeEmpty SkIRect::setEmpty
|
|
|
|
##
|
|
|
|
# ------------------------------------------------------------------------------
|
|
|
|
#Method void set(const SkIRect& src)
|
|
|
|
Sets Rect to src, promoting src members from integer to Scalar.
|
|
Very large values in src may lose precision.
|
|
|
|
#Param src integer Rect ##
|
|
|
|
#Example
|
|
SkIRect i_rect = {3, 4, 1, 2};
|
|
SkDebugf("i_rect: {%d, %d, %d, %d}\n", i_rect.fLeft, i_rect.fTop, i_rect.fRight, i_rect.fBottom);
|
|
SkRect f_rect;
|
|
f_rect.set(i_rect);
|
|
SkDebugf("f_rect: {%g, %g, %g, %g}\n", f_rect.fLeft, f_rect.fTop, f_rect.fRight, f_rect.fBottom);
|
|
#StdOut
|
|
i_rect: {3, 4, 1, 2}
|
|
f_rect: {3, 4, 1, 2}
|
|
##
|
|
##
|
|
|
|
#SeeAlso setLTRB SkIntToScalar
|
|
|
|
##
|
|
|
|
# ------------------------------------------------------------------------------
|
|
|
|
#Method void set(SkScalar left, SkScalar top, SkScalar right, SkScalar bottom)
|
|
|
|
Sets Rect to (left, top, right, bottom).
|
|
left and right are not sorted; left is not necessarily less than right.
|
|
top and bottom are not sorted; top is not necessarily less than bottom.
|
|
|
|
#Param left stored in fLeft ##
|
|
#Param top stored in fTop ##
|
|
#Param right stored in fRight ##
|
|
#Param bottom stored in fBottom ##
|
|
|
|
#Example
|
|
SkRect rect1 = {3, 4, 1, 2};
|
|
SkDebugf("rect1: {%g, %g, %g, %g}\n", rect1.fLeft, rect1.fTop, rect1.fRight, rect1.fBottom);
|
|
SkRect rect2;
|
|
rect2.set(3, 4, 1, 2);
|
|
SkDebugf("rect2: {%g, %g, %g, %g}\n", rect2.fLeft, rect2.fTop, rect2.fRight, rect2.fBottom);
|
|
#StdOut
|
|
rect1: {3, 4, 1, 2}
|
|
rect2: {3, 4, 1, 2}
|
|
##
|
|
##
|
|
|
|
#SeeAlso setLTRB setXYWH SkIRect::set
|
|
|
|
##
|
|
|
|
# ------------------------------------------------------------------------------
|
|
|
|
#Method void setLTRB(SkScalar left, SkScalar top, SkScalar right, SkScalar bottom)
|
|
|
|
Sets Rect to (left, top, right, bottom).
|
|
left and right are not sorted; left is not necessarily less than right.
|
|
top and bottom are not sorted; top is not necessarily less than bottom.
|
|
|
|
#Param left stored in fLeft ##
|
|
#Param top stored in fTop ##
|
|
#Param right stored in fRight ##
|
|
#Param bottom stored in fBottom ##
|
|
|
|
#Example
|
|
SkRect rect1 = {3, 4, 1, 2};
|
|
SkDebugf("rect1: {%g, %g, %g, %g}\n", rect1.fLeft, rect1.fTop, rect1.fRight, rect1.fBottom);
|
|
SkRect rect2;
|
|
rect2.setLTRB(3, 4, 1, 2);
|
|
SkDebugf("rect2: {%g, %g, %g, %g}\n", rect2.fLeft, rect2.fTop, rect2.fRight, rect2.fBottom);
|
|
#StdOut
|
|
rect1: {3, 4, 1, 2}
|
|
rect2: {3, 4, 1, 2}
|
|
##
|
|
##
|
|
|
|
#SeeAlso set setXYWH SkIRect::set
|
|
|
|
##
|
|
|
|
# ------------------------------------------------------------------------------
|
|
|
|
#Method void iset(int left, int top, int right, int bottom)
|
|
|
|
Sets Rect to (left, top, right, bottom).
|
|
All parameters are promoted from integer to Scalar.
|
|
left and right are not sorted; left is not necessarily less than right.
|
|
top and bottom are not sorted; top is not necessarily less than bottom.
|
|
|
|
#Param left promoted to SkScalar and stored in fLeft ##
|
|
#Param top promoted to SkScalar and stored in fTop ##
|
|
#Param right promoted to SkScalar and stored in fRight ##
|
|
#Param bottom promoted to SkScalar and stored in fBottom ##
|
|
|
|
#Example
|
|
SkRect rect1 = {3, 4, 1, 2};
|
|
SkDebugf("rect1: {%g, %g, %g, %g}\n", rect1.fLeft, rect1.fTop, rect1.fRight, rect1.fBottom);
|
|
SkRect rect2;
|
|
rect2.iset(3, 4, 1, 2);
|
|
SkDebugf("rect2: {%g, %g, %g, %g}\n", rect2.fLeft, rect2.fTop, rect2.fRight, rect2.fBottom);
|
|
#StdOut
|
|
rect1: {3, 4, 1, 2}
|
|
rect2: {3, 4, 1, 2}
|
|
##
|
|
##
|
|
|
|
#SeeAlso set setLTRB SkIRect::set SkIntToScalar
|
|
|
|
##
|
|
|
|
# ------------------------------------------------------------------------------
|
|
|
|
#Method void isetWH(int width, int height)
|
|
|
|
Sets Rect to (0, 0, width, height).
|
|
width and height may be zero or negative. width and height are promoted from
|
|
integer to SkScalar, large values may lose precision.
|
|
|
|
#Param width promoted to SkScalar and stored in fRight ##
|
|
#Param height promoted to SkScalar and stored in fBottom ##
|
|
|
|
#Example
|
|
SkRect rect1 = {0, 0, 1, 2};
|
|
SkDebugf("rect1: {%g, %g, %g, %g}\n", rect1.fLeft, rect1.fTop, rect1.fRight, rect1.fBottom);
|
|
SkRect rect2;
|
|
rect2.isetWH(1, 2);
|
|
SkDebugf("rect2: {%g, %g, %g, %g}\n", rect2.fLeft, rect2.fTop, rect2.fRight, rect2.fBottom);
|
|
#StdOut
|
|
rect1: {0, 0, 1, 2}
|
|
rect2: {0, 0, 1, 2}
|
|
##
|
|
##
|
|
|
|
#SeeAlso MakeWH MakeXYWH iset() SkIRect:MakeWH
|
|
|
|
##
|
|
|
|
# ------------------------------------------------------------------------------
|
|
|
|
#Method void set(const SkPoint pts[], int count)
|
|
|
|
Sets to bounds of Point array with count entries. If count is zero or smaller,
|
|
or if Point array contains an infinity or NaN, sets Rect to (0, 0, 0, 0).
|
|
|
|
Result is either empty or sorted: fLeft is less than or equal to fRight, and
|
|
fTop is less than or equal to fBottom.
|
|
|
|
#Param pts Point array ##
|
|
#Param count entries in array ##
|
|
|
|
#Example
|
|
SkPoint points[] = {{3, 4}, {1, 2}, {5, 6}, {SK_ScalarNaN, 8}};
|
|
for (int count = 0; count <= (int) SK_ARRAY_COUNT(points); ++count) {
|
|
SkRect rect;
|
|
rect.set(points, count);
|
|
if (count > 0) {
|
|
SkDebugf("added: %3g, %g ", points[count - 1].fX, points[count - 1].fY);
|
|
} else {
|
|
SkDebugf("%14s", " ");
|
|
}
|
|
SkDebugf("count: %d rect: %g, %g, %g, %g\n", count,
|
|
rect.fLeft, rect.fTop, rect.fRight, rect.fBottom);
|
|
}
|
|
#StdOut
|
|
count: 0 rect: 0, 0, 0, 0
|
|
added: 3, 4 count: 1 rect: 3, 4, 3, 4
|
|
added: 1, 2 count: 2 rect: 1, 2, 3, 4
|
|
added: 5, 6 count: 3 rect: 1, 2, 5, 6
|
|
added: nan, 8 count: 4 rect: 0, 0, 0, 0
|
|
##
|
|
##
|
|
|
|
#SeeAlso setBounds setBoundsCheck SkPath::addPoly
|
|
|
|
##
|
|
|
|
# ------------------------------------------------------------------------------
|
|
|
|
#Method void setBounds(const SkPoint pts[], int count)
|
|
|
|
Sets to bounds of Point array with count entries. If count is zero or smaller,
|
|
or if Point array contains an infinity or NaN, sets to (0, 0, 0, 0).
|
|
|
|
Result is either empty or sorted: fLeft is less than or equal to fRight, and
|
|
fTop is less than or equal to fBottom.
|
|
|
|
#Param pts Point array ##
|
|
#Param count entries in array ##
|
|
|
|
#Example
|
|
SkPoint points[] = {{3, 4}, {1, 2}, {5, 6}, {SK_ScalarNaN, 8}};
|
|
for (int count = 0; count <= (int) SK_ARRAY_COUNT(points); ++count) {
|
|
SkRect rect;
|
|
rect.setBounds(points, count);
|
|
if (count > 0) {
|
|
SkDebugf("added: %3g, %g ", points[count - 1].fX, points[count - 1].fY);
|
|
} else {
|
|
SkDebugf("%14s", " ");
|
|
}
|
|
SkDebugf("count: %d rect: %g, %g, %g, %g\n", count,
|
|
rect.fLeft, rect.fTop, rect.fRight, rect.fBottom);
|
|
}
|
|
#StdOut
|
|
count: 0 rect: 0, 0, 0, 0
|
|
added: 3, 4 count: 1 rect: 3, 4, 3, 4
|
|
added: 1, 2 count: 2 rect: 1, 2, 3, 4
|
|
added: 5, 6 count: 3 rect: 1, 2, 5, 6
|
|
added: nan, 8 count: 4 rect: 0, 0, 0, 0
|
|
##
|
|
##
|
|
|
|
#SeeAlso set setBoundsCheck SkPath::addPoly
|
|
|
|
##
|
|
|
|
# ------------------------------------------------------------------------------
|
|
|
|
#Method bool setBoundsCheck(const SkPoint pts[], int count)
|
|
|
|
Sets to bounds of Point array with count entries. Returns false if count is
|
|
zero or smaller, or if Point array contains an infinity or NaN; in these cases
|
|
sets Rect to (0, 0, 0, 0).
|
|
|
|
Result is either empty or sorted: fLeft is less than or equal to fRight, and
|
|
fTop is less than or equal to fBottom.
|
|
|
|
#Param pts Point array ##
|
|
#Param count entries in array ##
|
|
|
|
#Return true if all Point values are finite ##
|
|
|
|
#Example
|
|
SkPoint points[] = {{3, 4}, {1, 2}, {5, 6}, {SK_ScalarNaN, 8}};
|
|
for (int count = 0; count <= (int) SK_ARRAY_COUNT(points); ++count) {
|
|
SkRect rect;
|
|
bool success = rect.setBoundsCheck(points, count);
|
|
if (count > 0) {
|
|
SkDebugf("added: %3g, %g ", points[count - 1].fX, points[count - 1].fY);
|
|
} else {
|
|
SkDebugf("%14s", " ");
|
|
}
|
|
SkDebugf("count: %d rect: %g, %g, %g, %g success: %s\n", count,
|
|
rect.fLeft, rect.fTop, rect.fRight, rect.fBottom, success ? "true" : "false");
|
|
}
|
|
#StdOut
|
|
count: 0 rect: 0, 0, 0, 0 success: true
|
|
added: 3, 4 count: 1 rect: 3, 4, 3, 4 success: true
|
|
added: 1, 2 count: 2 rect: 1, 2, 3, 4 success: true
|
|
added: 5, 6 count: 3 rect: 1, 2, 5, 6 success: true
|
|
added: nan, 8 count: 4 rect: 0, 0, 0, 0 success: false
|
|
##
|
|
##
|
|
|
|
#SeeAlso set setBounds SkPath::addPoly
|
|
|
|
##
|
|
|
|
# ------------------------------------------------------------------------------
|
|
|
|
#Method void set(const SkPoint& p0, const SkPoint& p1)
|
|
|
|
Sets bounds to the smallest Rect enclosing Points p0 and p1. The result is
|
|
sorted and may be empty. Does not check to see if values are finite.
|
|
|
|
#Param p0 corner to include ##
|
|
#Param p1 corner to include ##
|
|
|
|
#Example
|
|
#Description
|
|
p0 and p1 may be swapped and have the same effect unless one contains NaN.
|
|
##
|
|
SkPoint point1 = {SK_ScalarNaN, 8};
|
|
SkPoint point2 = {3, 4};
|
|
SkRect rect;
|
|
rect.set(point1, point2);
|
|
SkDebugf("rect: %g, %g, %g, %g\n", rect.fLeft, rect.fTop, rect.fRight, rect.fBottom);
|
|
rect.set(point2, point1);
|
|
SkDebugf("rect: %g, %g, %g, %g\n", rect.fLeft, rect.fTop, rect.fRight, rect.fBottom);
|
|
##
|
|
|
|
#SeeAlso setBounds setBoundsCheck
|
|
|
|
##
|
|
|
|
# ------------------------------------------------------------------------------
|
|
|
|
#Method void setXYWH(SkScalar x, SkScalar y, SkScalar width, SkScalar height)
|
|
|
|
Sets Rect to
|
|
#Formula
|
|
(x, y, x + width, y + height)
|
|
##
|
|
. Does not validate input;
|
|
width or height may be negative.
|
|
|
|
#Param x stored in fLeft ##
|
|
#Param y stored in fTop ##
|
|
#Param width added to x and stored in fRight ##
|
|
#Param height added to y and stored in fBottom ##
|
|
|
|
#Example
|
|
SkRect rect;
|
|
rect.setXYWH(5, 35, -15, 25);
|
|
SkDebugf("rect: %g, %g, %g, %g isEmpty: %s\n", rect.left(), rect.top(), rect.right(),
|
|
rect.bottom(), rect.isEmpty() ? "true" : "false");
|
|
rect.sort();
|
|
SkDebugf("rect: %g, %g, %g, %g isEmpty: %s\n", rect.left(), rect.top(), rect.right(),
|
|
rect.bottom(), rect.isEmpty() ? "true" : "false");
|
|
#StdOut
|
|
rect: 5, 35, -10, 60 isEmpty: true
|
|
rect: -10, 35, 5, 60 isEmpty: false
|
|
##
|
|
##
|
|
|
|
#SeeAlso MakeXYWH setLTRB set SkIRect::setXYWH
|
|
|
|
##
|
|
|
|
# ------------------------------------------------------------------------------
|
|
|
|
#Method void setWH(SkScalar width, SkScalar height)
|
|
|
|
Sets Rect to (0, 0, width, height). Does not validate input;
|
|
width or height may be negative.
|
|
|
|
#Param width stored in fRight ##
|
|
#Param height stored in fBottom ##
|
|
|
|
#Example
|
|
SkRect rect;
|
|
rect.setWH(-15, 25);
|
|
SkDebugf("rect: %g, %g, %g, %g isEmpty: %s\n", rect.left(), rect.top(), rect.right(),
|
|
rect.bottom(), rect.isEmpty() ? "true" : "false");
|
|
rect.sort();
|
|
SkDebugf("rect: %g, %g, %g, %g isEmpty: %s\n", rect.left(), rect.top(), rect.right(),
|
|
rect.bottom(), rect.isEmpty() ? "true" : "false");
|
|
#StdOut
|
|
rect: 0, 0, -15, 25 isEmpty: true
|
|
rect: -15, 0, 0, 25 isEmpty: false
|
|
##
|
|
##
|
|
|
|
#SeeAlso MakeWH setXYWH isetWH
|
|
|
|
##
|
|
|
|
# ------------------------------------------------------------------------------
|
|
|
|
#Method void setLargest()
|
|
|
|
Sets rectangle left and top to most negative finite value, and sets
|
|
right and bottom to most positive finite value.
|
|
|
|
#Example
|
|
SkRect rect;
|
|
rect.setLargest();
|
|
SkDebugf("MakeLargest isLargest: %s\n", rect.isLargest() ? "true" : "false");
|
|
SkDebugf("MakeLargest isFinite: %s\n", rect.isFinite() ? "true" : "false");
|
|
rect.outset(1e31, 1e31);
|
|
SkDebugf("outset a little isLargest: %s\n", rect.isLargest() ? "true" : "false");
|
|
SkDebugf("outset a little isFinite: %s\n", rect.isFinite() ? "true" : "false");
|
|
rect.outset(1e32, 1e32);
|
|
SkDebugf("outset a little more isLargest: %s\n", rect.isLargest() ? "true" : "false");
|
|
SkDebugf("outset a little more isFinite: %s\n", rect.isFinite() ? "true" : "false");
|
|
#StdOut
|
|
MakeLargest isLargest: true
|
|
MakeLargest isFinite: true
|
|
outset a little isLargest: true
|
|
outset a little isFinite: true
|
|
outset a little more isLargest: false
|
|
outset a little more isFinite: false
|
|
##
|
|
##
|
|
|
|
#SeeAlso MakeLargest isLargest setLargestInverted SK_ScalarMin SK_ScalarMax
|
|
|
|
##
|
|
|
|
# ------------------------------------------------------------------------------
|
|
|
|
#Method void setLargestInverted()
|
|
|
|
Sets rectangle left and top to most positive finite value, and sets
|
|
right and bottom to most negative finite value.
|
|
|
|
Use to initial Rect before one or more calls to growToInclude.
|
|
|
|
#Example
|
|
auto debugster = [](const char* prefix, const SkRect& rect) -> void {
|
|
SkDebugf("%s ", prefix);
|
|
SkDebugf("rect: %g, %g, %g, %g ", rect.left(), rect.top(), rect.right(), rect.bottom());
|
|
SkDebugf("isEmpty: %s\n", rect.isEmpty() ? "true" : "false");
|
|
};
|
|
SkRect ptBounds;
|
|
ptBounds.setLargestInverted();
|
|
debugster("original", ptBounds);
|
|
ptBounds.growToInclude( { 42, 24 } );
|
|
debugster("grown", ptBounds);
|
|
#StdOut
|
|
original rect: 3.40282e+38, 3.40282e+38, -3.40282e+38, -3.40282e+38 isEmpty: true
|
|
grown rect: 42, 24, 42, 24 isEmpty: true
|
|
##
|
|
##
|
|
|
|
#SeeAlso growToInclude setEmpty setLargest
|
|
|
|
##
|
|
|
|
# ------------------------------------------------------------------------------
|
|
|
|
#Method SkRect makeOffset(SkScalar dx, SkScalar dy) const
|
|
|
|
Returns Rect offset by (dx, dy).
|
|
|
|
If dx is negative, Rect returned is moved to the left.
|
|
If dx is positive, Rect returned is moved to the right.
|
|
If dy is negative, Rect returned is moved upward.
|
|
If dy is positive, Rect returned is moved downward.
|
|
|
|
#Param dx added to fLeft and fRight ##
|
|
#Param dy added to fTop and fBottom ##
|
|
|
|
#Return Rect offset in x or y, with original width and height ##
|
|
|
|
#Example
|
|
SkRect rect = { 10, 50, 20, 60 };
|
|
SkDebugf("rect: %g, %g, %g, %g isEmpty: %s\n", rect.left(), rect.top(), rect.right(),
|
|
rect.bottom(), rect.isEmpty() ? "true" : "false");
|
|
rect = rect.makeOffset(15, 32);
|
|
SkDebugf("rect: %g, %g, %g, %g isEmpty: %s\n", rect.left(), rect.top(), rect.right(),
|
|
rect.bottom(), rect.isEmpty() ? "true" : "false");
|
|
#StdOut
|
|
rect: 10, 50, 20, 60 isEmpty: false
|
|
rect: 25, 82, 35, 92 isEmpty: false
|
|
##
|
|
##
|
|
|
|
#SeeAlso offset() makeInset makeOutset SkIRect::makeOffset
|
|
|
|
##
|
|
|
|
# ------------------------------------------------------------------------------
|
|
|
|
#Method SkRect makeInset(SkScalar dx, SkScalar dy) const
|
|
|
|
Returns Rect, inset by (dx, dy).
|
|
|
|
If dx is negative, Rect returned is wider.
|
|
If dx is positive, Rect returned is narrower.
|
|
If dy is negative, Rect returned is taller.
|
|
If dy is positive, Rect returned is shorter.
|
|
|
|
#Param dx added to fLeft and subtracted from fRight ##
|
|
#Param dy added to fTop and subtracted from fBottom ##
|
|
|
|
#Return Rect inset symmetrically left and right, top and bottom ##
|
|
|
|
#Example
|
|
SkRect rect = { 10, 50, 20, 60 };
|
|
SkDebugf("rect: %g, %g, %g, %g isEmpty: %s\n", rect.left(), rect.top(), rect.right(),
|
|
rect.bottom(), rect.isEmpty() ? "true" : "false");
|
|
rect = rect.makeInset(15, 32);
|
|
SkDebugf("rect: %g, %g, %g, %g isEmpty: %s\n", rect.left(), rect.top(), rect.right(),
|
|
rect.bottom(), rect.isEmpty() ? "true" : "false");
|
|
#StdOut
|
|
rect: 10, 50, 20, 60 isEmpty: false
|
|
rect: 25, 82, 5, 28 isEmpty: true
|
|
##
|
|
##
|
|
|
|
#SeeAlso inset() makeOffset makeOutset SkIRect::makeInset
|
|
|
|
##
|
|
|
|
# ------------------------------------------------------------------------------
|
|
|
|
#Method SkRect makeOutset(SkScalar dx, SkScalar dy) const
|
|
|
|
Returns Rect, outset by (dx, dy).
|
|
|
|
If dx is negative, Rect returned is narrower.
|
|
If dx is positive, Rect returned is wider.
|
|
If dy is negative, Rect returned is shorter.
|
|
If dy is positive, Rect returned is taller.
|
|
|
|
#Param dx subtracted to fLeft and added from fRight ##
|
|
#Param dy subtracted to fTop and added from fBottom ##
|
|
|
|
#Return Rect outset symmetrically left and right, top and bottom ##
|
|
|
|
#Example
|
|
SkRect rect = { 10, 50, 20, 60 };
|
|
SkDebugf("rect: %g, %g, %g, %g isEmpty: %s\n", rect.left(), rect.top(), rect.right(),
|
|
rect.bottom(), rect.isEmpty() ? "true" : "false");
|
|
rect = rect.makeOutset(15, 32);
|
|
SkDebugf("rect: %g, %g, %g, %g isEmpty: %s\n", rect.left(), rect.top(), rect.right(),
|
|
rect.bottom(), rect.isEmpty() ? "true" : "false");
|
|
#StdOut
|
|
rect: 10, 50, 20, 60 isEmpty: false
|
|
rect: -5, 18, 35, 92 isEmpty: false
|
|
##
|
|
##
|
|
|
|
#SeeAlso outset() makeOffset makeInset SkIRect::makeOutset
|
|
|
|
##
|
|
|
|
# ------------------------------------------------------------------------------
|
|
|
|
#Method void offset(SkScalar dx, SkScalar dy)
|
|
|
|
Offsets Rect by adding dx to fLeft, fRight; and by adding dy to fTop, fBottom.
|
|
|
|
If dx is negative, moves Rect to the left.
|
|
If dx is positive, moves Rect to the right.
|
|
If dy is negative, moves Rect upward.
|
|
If dy is positive, moves Rect downward.
|
|
|
|
#Param dx offset added to fLeft and fRight ##
|
|
#Param dy offset added to fTop and fBottom ##
|
|
|
|
#Example
|
|
SkRect rect = { 10, 14, 50, 73 };
|
|
rect.offset(5, 13);
|
|
SkDebugf("rect: %g, %g, %g, %g\n", rect.fLeft, rect.fTop, rect.fRight, rect.fBottom);
|
|
#StdOut
|
|
rect: 15, 27, 55, 86
|
|
##
|
|
##
|
|
|
|
#SeeAlso offsetTo makeOffset SkIRect::offset
|
|
|
|
##
|
|
|
|
# ------------------------------------------------------------------------------
|
|
|
|
#Method void offset(const SkPoint& delta)
|
|
|
|
Offsets Rect by adding delta.fX to fLeft, fRight; and by adding delta.fY to
|
|
fTop, fBottom.
|
|
|
|
If delta.fX is negative, moves Rect to the left.
|
|
If delta.fX is positive, moves Rect to the right.
|
|
If delta.fY is negative, moves Rect upward.
|
|
If delta.fY is positive, moves Rect downward.
|
|
|
|
#Param delta added to Rect ##
|
|
|
|
#Example
|
|
SkRect rect = { 10, 14, 50, 73 };
|
|
rect.offset({5, 13});
|
|
SkDebugf("rect: %g, %g, %g, %g\n", rect.fLeft, rect.fTop, rect.fRight, rect.fBottom);
|
|
#StdOut
|
|
rect: 15, 27, 55, 86
|
|
##
|
|
##
|
|
|
|
#SeeAlso offsetTo makeOffset SkIRect::offset
|
|
|
|
##
|
|
|
|
# ------------------------------------------------------------------------------
|
|
|
|
#Method void offsetTo(SkScalar newX, SkScalar newY)
|
|
|
|
Offsets Rect so that fLeft equals newX, and fTop equals newY. width and height
|
|
are unchanged.
|
|
|
|
#Param newX stored in fLeft, preserving width() ##
|
|
#Param newY stored in fTop, preserving height() ##
|
|
|
|
#Example
|
|
SkRect rect = { 10, 14, 50, 73 };
|
|
rect.offsetTo(15, 27);
|
|
SkDebugf("rect: %g, %g, %g, %g\n", rect.fLeft, rect.fTop, rect.fRight, rect.fBottom);
|
|
#StdOut
|
|
rect: 15, 27, 55, 86
|
|
##
|
|
##
|
|
|
|
#SeeAlso offset makeOffset setXYWH SkIRect::offsetTo
|
|
|
|
##
|
|
|
|
# ------------------------------------------------------------------------------
|
|
|
|
#Method void inset(SkScalar dx, SkScalar dy)
|
|
|
|
Insets Rect by (dx, dy).
|
|
|
|
If dx is positive, makes Rect narrower.
|
|
If dx is negative, makes Rect wider.
|
|
If dy is positive, makes Rect shorter.
|
|
If dy is negative, makes Rect taller.
|
|
|
|
#Param dx added to fLeft and subtracted from fRight ##
|
|
#Param dy added to fTop and subtracted from fBottom ##
|
|
|
|
#Example
|
|
SkRect rect = { 10, 14, 50, 73 };
|
|
rect.inset(5, 13);
|
|
SkDebugf("rect: %g, %g, %g, %g\n", rect.fLeft, rect.fTop, rect.fRight, rect.fBottom);
|
|
#StdOut
|
|
rect: 15, 27, 45, 60
|
|
##
|
|
##
|
|
|
|
#SeeAlso outset makeInset SkIRect::inset
|
|
|
|
##
|
|
|
|
# ------------------------------------------------------------------------------
|
|
|
|
#Method void outset(SkScalar dx, SkScalar dy)
|
|
|
|
Outsets Rect by (dx, dy).
|
|
|
|
If dx is positive, makes Rect wider.
|
|
If dx is negative, makes Rect narrower.
|
|
If dy is positive, makes Rect taller.
|
|
If dy is negative, makes Rect shorter.
|
|
|
|
#Param dx subtracted to fLeft and added from fRight ##
|
|
#Param dy subtracted to fTop and added from fBottom ##
|
|
|
|
#Example
|
|
SkRect rect = { 10, 14, 50, 73 };
|
|
rect.outset(5, 13);
|
|
SkDebugf("rect: %g, %g, %g, %g\n", rect.fLeft, rect.fTop, rect.fRight, rect.fBottom);
|
|
#StdOut
|
|
rect: 5, 1, 55, 86
|
|
##
|
|
##
|
|
|
|
#SeeAlso inset makeOutset SkIRect::outset
|
|
|
|
##
|
|
|
|
#Topic Intersection
|
|
|
|
Rects intersect when they enclose a common area. To intersect, each of the pair
|
|
must describe area; fLeft is less than fRight, and fTop is less than fBottom;
|
|
empty() returns false. The intersection of Rect a and Rect b can be described by:
|
|
#Formula
|
|
(max(a.fLeft, b.fLeft), max(a.fTop, b.fTop),
|
|
min(a.fRight, b.fRight), min(a.fBottom, b.fBottom))
|
|
##
|
|
The intersection is only meaningful if the resulting Rect is not empty and
|
|
describes an area: fLeft is less than fRight, and fTop is less than fBottom.
|
|
|
|
# ------------------------------------------------------------------------------
|
|
|
|
#Method bool intersect(const SkRect& r)
|
|
|
|
Returns true if Rect intersects r, and sets Rect to intersection.
|
|
Returns false if Rect does not intersect r, and leaves Rect unchanged.
|
|
|
|
Returns false if either r or Rect is empty, leaving Rect unchanged.
|
|
|
|
#Param r limit of result ##
|
|
|
|
#Return true if r and Rect have area in common ##
|
|
|
|
#Example
|
|
#Description
|
|
Two SkDebugf calls are required. If the calls are combined, their arguments
|
|
may not be evaluated in left to right order: the printed intersection may
|
|
be before or after the call to intersect.
|
|
##
|
|
SkRect leftRect = { 10, 40, 50, 80 };
|
|
SkRect rightRect = { 30, 60, 70, 90 };
|
|
SkDebugf("%s intersection: ", leftRect.intersect(rightRect) ? "" : "no ");
|
|
SkDebugf("%g, %g, %g, %g\n", leftRect.left(), leftRect.top(),
|
|
leftRect.right(), leftRect.bottom());
|
|
#StdOut
|
|
intersection: 30, 60, 50, 80
|
|
##
|
|
##
|
|
|
|
#SeeAlso intersects Intersects join SkIRect::intersect
|
|
|
|
##
|
|
|
|
# ------------------------------------------------------------------------------
|
|
|
|
#Method bool intersect(SkScalar left, SkScalar top, SkScalar right, SkScalar bottom)
|
|
|
|
Constructs Rect to intersect from (left, top, right, bottom). Does not sort
|
|
construction.
|
|
|
|
Returns true if Rect intersects construction, and sets Rect to intersection.
|
|
Returns false if Rect does not intersect construction, and leaves Rect unchanged.
|
|
|
|
Returns false if either construction or Rect is empty, leaving Rect unchanged.
|
|
|
|
#Param left x minimum of constructed Rect ##
|
|
#Param top y minimum of constructed Rect ##
|
|
#Param right x maximum of constructed Rect ##
|
|
#Param bottom y maximum of constructed Rect ##
|
|
|
|
#Return true if construction and Rect have area in common ##
|
|
|
|
#Example
|
|
#Description
|
|
Two SkDebugf calls are required. If the calls are combined, their arguments
|
|
may not be evaluated in left to right order: the printed intersection may
|
|
be before or after the call to intersect.
|
|
##
|
|
SkRect leftRect = { 10, 40, 50, 80 };
|
|
SkDebugf("%s intersection: ", leftRect.intersect(30, 60, 70, 90) ? "" : "no ");
|
|
SkDebugf("%g, %g, %g, %g\n", leftRect.left(), leftRect.top(),
|
|
leftRect.right(), leftRect.bottom());
|
|
#StdOut
|
|
intersection: 30, 60, 50, 80
|
|
##
|
|
##
|
|
|
|
#SeeAlso intersects Intersects join SkIRect::intersect
|
|
|
|
##
|
|
|
|
# ------------------------------------------------------------------------------
|
|
|
|
#Method bool SK_WARN_UNUSED_RESULT intersect(const SkRect& a, const SkRect& b)
|
|
|
|
Returns true if a intersects b, and sets Rect to intersection.
|
|
Returns false if a does not intersect b, and leaves Rect unchanged.
|
|
|
|
Returns false if either a or b is empty, leaving Rect unchanged.
|
|
|
|
#Param a Rect to intersect ##
|
|
#Param b Rect to intersect ##
|
|
|
|
#Return true if a and b have area in common ##
|
|
|
|
#Example
|
|
SkRect result;
|
|
bool intersected = result.intersect({ 10, 40, 50, 80 }, { 30, 60, 70, 90 });
|
|
SkDebugf("%s intersection: %g, %g, %g, %g\n", intersected ? "" : "no ",
|
|
result.left(), result.top(), result.right(), result.bottom());
|
|
#StdOut
|
|
intersection: 30, 60, 50, 80
|
|
##
|
|
##
|
|
|
|
#SeeAlso intersects Intersects join SkIRect::intersect
|
|
|
|
##
|
|
|
|
# ------------------------------------------------------------------------------
|
|
|
|
#Method bool intersects(SkScalar left, SkScalar top, SkScalar right, SkScalar bottom) const
|
|
|
|
Constructs Rect to intersect from (left, top, right, bottom). Does not sort
|
|
construction.
|
|
|
|
Returns true if Rect intersects construction.
|
|
Returns false if either construction or Rect is empty, or do not intersect.
|
|
|
|
#Param left x minimum of constructed Rect ##
|
|
#Param top y minimum of constructed Rect ##
|
|
#Param right x maximum of constructed Rect ##
|
|
#Param bottom y maximum of constructed Rect ##
|
|
|
|
#Return true if construction and Rect have area in common ##
|
|
|
|
#Example
|
|
SkRect rect = { 10, 40, 50, 80 };
|
|
SkDebugf("%s intersection", rect.intersects(30, 60, 70, 90) ? "" : "no ");
|
|
#StdOut
|
|
intersection
|
|
##
|
|
##
|
|
|
|
#SeeAlso intersect Intersects SkIRect::Intersects
|
|
|
|
##
|
|
|
|
# ------------------------------------------------------------------------------
|
|
|
|
#Method bool intersects(const SkRect& r) const
|
|
|
|
Returns true if Rect intersects r.
|
|
Returns false if either r or Rect is empty, or do not intersect.
|
|
|
|
#Param r Rect to intersect ##
|
|
|
|
#Return true if r and Rect have area in common ##
|
|
|
|
#Example
|
|
SkRect rect = { 10, 40, 50, 80 };
|
|
SkDebugf("%s intersection", rect.intersects({30, 60, 70, 90}) ? "" : "no ");
|
|
#StdOut
|
|
intersection
|
|
##
|
|
##
|
|
|
|
#SeeAlso intersect Intersects SkIRect::Intersects
|
|
|
|
##
|
|
|
|
# ------------------------------------------------------------------------------
|
|
|
|
#Method static bool Intersects(const SkRect& a, const SkRect& b)
|
|
|
|
Returns true if a intersects b.
|
|
Returns false if either a or b is empty, or do not intersect.
|
|
|
|
#Param a Rect to intersect ##
|
|
#Param b Rect to intersect ##
|
|
|
|
#Return true if a and b have area in common ##
|
|
|
|
#Example
|
|
SkDebugf("%s intersection", SkRect::Intersects({10, 40, 50, 80}, {30, 60, 70, 90}) ? "" : "no ");
|
|
#StdOut
|
|
intersection
|
|
##
|
|
##
|
|
|
|
#SeeAlso intersect intersects SkIRect::Intersects
|
|
|
|
##
|
|
|
|
#Topic Intersection ##
|
|
|
|
|
|
# ------------------------------------------------------------------------------
|
|
|
|
#Method void join(SkScalar left, SkScalar top, SkScalar right, SkScalar bottom)
|
|
|
|
Constructs Rect to intersect from (left, top, right, bottom). Does not sort
|
|
construction.
|
|
|
|
Sets Rect to the union of itself and the construction.
|
|
|
|
Has no effect if construction is empty. Otherwise, if Rect is empty, sets
|
|
Rect to construction.
|
|
|
|
#Param left x minimum of constructed Rect ##
|
|
#Param top y minimum of constructed Rect ##
|
|
#Param right x maximum of constructed Rect ##
|
|
#Param bottom y maximum of constructed Rect ##
|
|
|
|
#Example
|
|
SkRect rect = { 10, 20, 15, 25};
|
|
rect.join(50, 60, 55, 65);
|
|
SkDebugf("join: %g, %g, %g, %g\n", rect.fLeft, rect.fTop, rect.fRight, rect.fBottom);
|
|
#StdOut
|
|
join: 10, 20, 55, 65
|
|
##
|
|
##
|
|
|
|
#SeeAlso joinNonEmptyArg joinPossiblyEmptyRect SkIRect::join
|
|
|
|
##
|
|
|
|
# ------------------------------------------------------------------------------
|
|
|
|
#Method void join(const SkRect& r)
|
|
|
|
Sets Rect to the union of itself and r.
|
|
|
|
Has no effect if r is empty. Otherwise, if Rect is empty, sets
|
|
Rect to r.
|
|
|
|
#Param r expansion Rect ##
|
|
|
|
#Example
|
|
SkRect rect = { 10, 20, 15, 25};
|
|
rect.join({50, 60, 55, 65});
|
|
SkDebugf("join: %g, %g, %g, %g\n", rect.fLeft, rect.fTop, rect.fRight, rect.fBottom);
|
|
#StdOut
|
|
join: 10, 20, 55, 65
|
|
##
|
|
##
|
|
|
|
#SeeAlso joinNonEmptyArg joinPossiblyEmptyRect SkIRect::join
|
|
|
|
##
|
|
|
|
# ------------------------------------------------------------------------------
|
|
|
|
#Method void joinNonEmptyArg(const SkRect& r)
|
|
|
|
Sets Rect to the union of itself and r.
|
|
|
|
Asserts if r is empty and SK_DEBUG is defined.
|
|
If Rect is empty, sets Rect to r.
|
|
|
|
May produce incorrect results if r is empty.
|
|
|
|
#Param r expansion Rect ##
|
|
|
|
#Example
|
|
#Description
|
|
Since Rect is not sorted, first result is copy of toJoin.
|
|
##
|
|
SkRect rect = { 10, 100, 15, 0};
|
|
SkRect sorted = rect.makeSorted();
|
|
SkRect toJoin = { 50, 60, 55, 65 };
|
|
rect.joinNonEmptyArg(toJoin);
|
|
SkDebugf("rect: %g, %g, %g, %g\n", rect.fLeft, rect.fTop, rect.fRight, rect.fBottom);
|
|
sorted.joinNonEmptyArg(toJoin);
|
|
SkDebugf("sorted: %g, %g, %g, %g\n", sorted.fLeft, sorted.fTop, sorted.fRight, sorted.fBottom);
|
|
#StdOut
|
|
rect: 50, 60, 55, 65
|
|
sorted: 10, 0, 55, 100
|
|
##
|
|
##
|
|
|
|
#SeeAlso join joinPossiblyEmptyRect SkIRect::join
|
|
|
|
##
|
|
|
|
# ------------------------------------------------------------------------------
|
|
|
|
#Method void joinPossiblyEmptyRect(const SkRect& r)
|
|
|
|
Sets Rect to the union of itself and the construction.
|
|
|
|
May produce incorrect results if Rect or r is empty.
|
|
|
|
#Param r expansion Rect ##
|
|
|
|
#Example
|
|
#Description
|
|
Since Rect is not sorted, first result is not useful.
|
|
##
|
|
SkRect rect = { 10, 100, 15, 0};
|
|
SkRect sorted = rect.makeSorted();
|
|
SkRect toJoin = { 50, 60, 55, 65 };
|
|
rect.joinPossiblyEmptyRect(toJoin);
|
|
SkDebugf("rect: %g, %g, %g, %g\n", rect.fLeft, rect.fTop, rect.fRight, rect.fBottom);
|
|
sorted.joinPossiblyEmptyRect(toJoin);
|
|
SkDebugf("sorted: %g, %g, %g, %g\n", sorted.fLeft, sorted.fTop, sorted.fRight, sorted.fBottom);
|
|
#StdOut
|
|
rect: 10, 60, 55, 65
|
|
sorted: 10, 0, 55, 100
|
|
##
|
|
##
|
|
|
|
#SeeAlso joinNonEmptyArg join SkIRect::join
|
|
|
|
##
|
|
|
|
# ------------------------------------------------------------------------------
|
|
|
|
#Method void growToInclude(SkPoint pt)
|
|
|
|
Grows Rect to include (pt.fX, pt.fY), modifying it so that:
|
|
#Formula
|
|
fLeft <= pt.fX <= fRight && fTop <= pt.fY <= fBottom
|
|
##
|
|
.
|
|
|
|
If Rect is initialized with setLargestInverted, then Rect will contain bounds of
|
|
Points after one or more calls. In this case, Rect is empty after first call.
|
|
|
|
#Param pt Point to include ##
|
|
|
|
#Example
|
|
SkRect rect;
|
|
rect.setLargestInverted();
|
|
rect.growToInclude( { 42, 24 } );
|
|
SkDebugf("rect: %g, %g, %g, %g ", rect.left(), rect.top(), rect.right(), rect.bottom());
|
|
SkDebugf("isEmpty: %s\n", rect.isEmpty() ? "true" : "false");
|
|
#StdOut
|
|
rect: 42, 24, 42, 24 isEmpty: true
|
|
##
|
|
##
|
|
|
|
#SeeAlso setLargestInverted join
|
|
|
|
##
|
|
|
|
# ------------------------------------------------------------------------------
|
|
|
|
#Method void growToInclude(const SkPoint pts[], int count)
|
|
|
|
For each of count Point in pts, grows Rect to include (pt.fX, pt.fY), modifying
|
|
it so that:
|
|
#Formula
|
|
fLeft <= pt.fX <= fRight && fTop <= pt.fY <= fBottom
|
|
##
|
|
.
|
|
|
|
If Rect is initialized with setLargestInverted, then Rect will contain bounds of
|
|
Points after one or more calls. In this case, Rect is empty after first call.
|
|
|
|
#Param pts Point array ##
|
|
#Param count number of points in array ##
|
|
|
|
#Example
|
|
SkPoint pts[] = { { 30, 50 }, { 40, 50 }, { 30, 60 } };
|
|
SkRect rect = { pts[0].fX, pts[0].fY, pts[0].fX, pts[0].fY };
|
|
rect.growToInclude( pts[1] );
|
|
rect.growToInclude( pts[2] );
|
|
SkDebugf("rect: %g, %g, %g, %g ", rect.left(), rect.top(), rect.right(), rect.bottom());
|
|
#StdOut
|
|
rect: 30, 50, 40, 60
|
|
##
|
|
##
|
|
|
|
#SeeAlso setLargestInverted join
|
|
|
|
##
|
|
|
|
# ------------------------------------------------------------------------------
|
|
|
|
#Method void growToInclude(const SkPoint pts[], size_t stride, int count)
|
|
|
|
For each of count Point in pts, grows Rect to include (pt.fX, pt.fY), modifying
|
|
it so that:
|
|
#Formula
|
|
fLeft <= pt.fX <= fRight && fTop <= pt.fY <= fBottom
|
|
##
|
|
. Point may be followed with other data in each array element. stride is number
|
|
of bytes in element; the interval to skip to advance from one Point to
|
|
the next.
|
|
|
|
If Rect is initialized with setLargestInverted, then Rect will contain bounds of
|
|
Points after one or more calls. In this case, Rect is empty after first call.
|
|
|
|
#Param pts array of elements beginning with Point ##
|
|
#Param stride size of pts elements in 32-bit words; zero or greater ##
|
|
#Param count number of elements in array ##
|
|
|
|
#Bug 7142 ##
|
|
#Example
|
|
SkPoint3 pts[] = { { 30, 50, -1 }, { 40, 50, -1 }, { 30, 60, -1 } };
|
|
SkRect rect;
|
|
rect.setLargestInverted();
|
|
rect.growToInclude((SkPoint* ) &pts[0].fX, sizeof(SkPoint3), SK_ARRAY_COUNT(pts));
|
|
SkDebugf("rect: %g, %g, %g, %g ", rect.left(), rect.top(), rect.right(), rect.bottom());
|
|
#StdOut
|
|
#Volatile
|
|
rect: 30, 50, 40, 60
|
|
##
|
|
##
|
|
|
|
#SeeAlso setLargestInverted join
|
|
|
|
##
|
|
|
|
# ------------------------------------------------------------------------------
|
|
|
|
#Method bool contains(const SkRect& r) const {
|
|
|
|
Returns true if Rect contains r.
|
|
Returns false if Rect is empty or r is empty.
|
|
|
|
Rect contains r when Rect area completely includes r area.
|
|
|
|
#Param r Rect contained ##
|
|
|
|
#Return true if all sides of Rect are outside r ##
|
|
|
|
#Example
|
|
SkRect rect = { 30, 50, 40, 60 };
|
|
SkRect tests[] = { { 30, 50, 31, 51}, { 39, 49, 40, 50}, { 29, 59, 30, 60} };
|
|
for (auto contained : tests) {
|
|
SkDebugf("rect: (%g, %g, %g, %g) %s (%g, %g, %g, %g)\n",
|
|
rect.left(), rect.top(), rect.right(), rect.bottom(),
|
|
rect.contains(contained) ? "contains" : "does not contain",
|
|
contained.left(), contained.top(), contained.right(), contained.bottom());
|
|
}
|
|
#StdOut
|
|
rect: (30, 50, 40, 60) contains (30, 50, 31, 51)
|
|
rect: (30, 50, 40, 60) does not contain (39, 49, 40, 50)
|
|
rect: (30, 50, 40, 60) does not contain (29, 59, 30, 60)
|
|
##
|
|
##
|
|
|
|
#SeeAlso SkIRect::contains
|
|
|
|
##
|
|
|
|
# ------------------------------------------------------------------------------
|
|
|
|
#Method bool contains(const SkIRect& r) const
|
|
|
|
Returns true if Rect contains r.
|
|
Returns false if Rect is empty or r is empty.
|
|
|
|
Rect contains r when Rect area completely includes r area.
|
|
|
|
#Param r IRect contained ##
|
|
|
|
#Return true if all sides of Rect are outside r ##
|
|
|
|
#Example
|
|
SkRect rect = { 30, 50, 40, 60 };
|
|
SkIRect tests[] = { { 30, 50, 31, 51}, { 39, 49, 40, 50}, { 29, 59, 30, 60} };
|
|
for (auto contained : tests) {
|
|
SkDebugf("rect: (%g, %g, %g, %g) %s (%d, %d, %d, %d)\n",
|
|
rect.left(), rect.top(), rect.right(), rect.bottom(),
|
|
rect.contains(contained) ? "contains" : "does not contain",
|
|
contained.left(), contained.top(), contained.right(), contained.bottom());
|
|
}
|
|
#StdOut
|
|
rect: (30, 50, 40, 60) contains (30, 50, 31, 51)
|
|
rect: (30, 50, 40, 60) does not contain (39, 49, 40, 50)
|
|
rect: (30, 50, 40, 60) does not contain (29, 59, 30, 60)
|
|
##
|
|
##
|
|
|
|
#SeeAlso SkIRect::contains
|
|
|
|
##
|
|
|
|
#Topic Round
|
|
|
|
# ------------------------------------------------------------------------------
|
|
|
|
#Method void round(SkIRect* dst) const
|
|
|
|
Sets IRect by adding 0.5 and discarding the fractional portion of Rect
|
|
members, using
|
|
#Formula
|
|
(SkScalarRoundToInt(fLeft), SkScalarRoundToInt(fTop),
|
|
SkScalarRoundToInt(fRight), SkScalarRoundToInt(fBottom))
|
|
##
|
|
.
|
|
|
|
#Param dst storage for IRect ##
|
|
|
|
#Example
|
|
SkRect rect = { 30.5f, 50.5f, 40.5f, 60.5f };
|
|
SkIRect round;
|
|
rect.round(&round);
|
|
SkDebugf("round: %d, %d, %d, %d\n", round.fLeft, round.fTop, round.fRight, round.fBottom);
|
|
#StdOut
|
|
round: 31, 51, 41, 61
|
|
##
|
|
##
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|
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|
#SeeAlso roundIn roundOut SkScalarRoundToInt
|
|
|
|
##
|
|
|
|
# ------------------------------------------------------------------------------
|
|
|
|
#Method void roundOut(SkIRect* dst) const
|
|
|
|
Sets IRect by discarding the fractional portion of fLeft and fTop; and
|
|
rounding up fRight and FBottom, using
|
|
#Formula
|
|
(SkScalarFloorToInt(fLeft), SkScalarFloorToInt(fTop),
|
|
SkScalarCeilToInt(fRight), SkScalarCeilToInt(fBottom))
|
|
##
|
|
.
|
|
|
|
#Param dst storage for IRect ##
|
|
|
|
#Example
|
|
SkRect rect = { 30.5f, 50.5f, 40.5f, 60.5f };
|
|
SkIRect round;
|
|
rect.roundOut(&round);
|
|
SkDebugf("round: %d, %d, %d, %d\n", round.fLeft, round.fTop, round.fRight, round.fBottom);
|
|
#StdOut
|
|
round: 30, 50, 41, 61
|
|
##
|
|
##
|
|
|
|
#SeeAlso roundIn round SkScalarRoundToInt
|
|
|
|
##
|
|
|
|
# ------------------------------------------------------------------------------
|
|
|
|
#Method void roundOut(SkRect* dst) const
|
|
|
|
Sets Rect by discarding the fractional portion of fLeft and fTop; and
|
|
rounding up fRight and FBottom, using
|
|
#Formula
|
|
(SkScalarFloorToInt(fLeft), SkScalarFloorToInt(fTop),
|
|
SkScalarCeilToInt(fRight), SkScalarCeilToInt(fBottom))
|
|
##
|
|
.
|
|
|
|
#Param dst storage for Rect ##
|
|
|
|
#Example
|
|
SkRect rect = { 30.5f, 50.5f, 40.5f, 60.5f };
|
|
SkRect round;
|
|
rect.roundOut(&round);
|
|
SkDebugf("round: %g, %g, %g, %g\n", round.fLeft, round.fTop, round.fRight, round.fBottom);
|
|
#StdOut
|
|
round: 30, 50, 41, 61
|
|
##
|
|
##
|
|
|
|
#SeeAlso roundIn round SkScalarRoundToInt
|
|
|
|
##
|
|
|
|
# ------------------------------------------------------------------------------
|
|
|
|
#Method void roundIn(SkIRect* dst) const
|
|
|
|
Sets Rect by rounding up fLeft and fTop; and
|
|
discarding the fractional portion of fRight and FBottom, using
|
|
#Formula
|
|
(SkScalarCeilToInt(fLeft), SkScalarCeilToInt(fTop),
|
|
SkScalarFloorToInt(fRight), SkScalarFloorToInt(fBottom))
|
|
##
|
|
.
|
|
|
|
#Param dst storage for IRect ##
|
|
|
|
#Example
|
|
SkRect rect = { 30.5f, 50.5f, 40.5f, 60.5f };
|
|
SkIRect round;
|
|
rect.roundIn(&round);
|
|
SkDebugf("round: %d, %d, %d, %d\n", round.fLeft, round.fTop, round.fRight, round.fBottom);
|
|
#StdOut
|
|
round: 31, 51, 40, 60
|
|
##
|
|
##
|
|
|
|
#SeeAlso roundOut round SkScalarRoundToInt
|
|
|
|
##
|
|
|
|
# ------------------------------------------------------------------------------
|
|
|
|
#Method SkIRect round() const
|
|
|
|
Returns IRect by adding 0.5 and discarding the fractional portion of Rect
|
|
members, using
|
|
#Formula
|
|
(SkScalarRoundToInt(fLeft), SkScalarRoundToInt(fTop),
|
|
SkScalarRoundToInt(fRight), SkScalarRoundToInt(fBottom))
|
|
##
|
|
.
|
|
|
|
#Return rounded IRect ##
|
|
|
|
#Example
|
|
SkRect rect = { 30.5f, 50.5f, 40.5f, 60.5f };
|
|
SkIRect round = rect.round();
|
|
SkDebugf("round: %d, %d, %d, %d\n", round.fLeft, round.fTop, round.fRight, round.fBottom);
|
|
#StdOut
|
|
round: 31, 51, 41, 61
|
|
##
|
|
##
|
|
|
|
#SeeAlso roundOut roundIn SkScalarRoundToInt
|
|
|
|
##
|
|
|
|
# ------------------------------------------------------------------------------
|
|
|
|
#Method SkIRect roundOut() const
|
|
|
|
Sets IRect by discarding the fractional portion of fLeft and fTop; and
|
|
rounding up fRight and FBottom, using
|
|
#Formula
|
|
(SkScalarFloorToInt(fLeft), SkScalarFloorToInt(fTop),
|
|
SkScalarCeilToInt(fRight), SkScalarCeilToInt(fBottom))
|
|
##
|
|
.
|
|
|
|
#Return rounded IRect ##
|
|
|
|
#Example
|
|
SkRect rect = { 30.5f, 50.5f, 40.5f, 60.5f };
|
|
SkIRect round = rect.roundOut();
|
|
SkDebugf("round: %d, %d, %d, %d\n", round.fLeft, round.fTop, round.fRight, round.fBottom);
|
|
#StdOut
|
|
round: 30, 50, 41, 61
|
|
##
|
|
##
|
|
|
|
#SeeAlso round roundIn SkScalarRoundToInt
|
|
|
|
##
|
|
|
|
#Topic Round ##
|
|
|
|
# ------------------------------------------------------------------------------
|
|
|
|
#Method void sort()
|
|
|
|
Swaps fLeft and fRight if fLeft is greater than fRight; and swaps
|
|
fTop and fBottom if fTop is greater than fBottom. Result may be empty;
|
|
and width() and height() will be zero or positive.
|
|
|
|
#Example
|
|
SkRect rect = { 30.5f, 50.5f, 20.5f, 10.5f };
|
|
SkDebugf("rect: %g, %g, %g, %g\n", rect.fLeft, rect.fTop, rect.fRight, rect.fBottom);
|
|
rect.sort();
|
|
SkDebugf("sorted: %g, %g, %g, %g\n", rect.fLeft, rect.fTop, rect.fRight, rect.fBottom);
|
|
#StdOut
|
|
rect: 30.5, 50.5, 20.5, 10.5
|
|
sorted: 20.5, 10.5, 30.5, 50.5
|
|
##
|
|
##
|
|
|
|
#SeeAlso makeSorted SkIRect::sort
|
|
|
|
##
|
|
|
|
# ------------------------------------------------------------------------------
|
|
|
|
#Method SkRect makeSorted() const
|
|
|
|
Returns Rect with fLeft and fRight swapped if fLeft is greater than fRight; and
|
|
with fTop and fBottom swapped if fTop is greater than fBottom. Result may be empty;
|
|
and width() and height() will be zero or positive.
|
|
|
|
#Return sorted Rect ##
|
|
|
|
#Example
|
|
SkRect rect = { 30.5f, 50.5f, 20.5f, 10.5f };
|
|
SkDebugf("rect: %g, %g, %g, %g\n", rect.fLeft, rect.fTop, rect.fRight, rect.fBottom);
|
|
SkRect sort = rect.makeSorted();
|
|
SkDebugf("sorted: %g, %g, %g, %g\n", sort.fLeft, sort.fTop, sort.fRight, sort.fBottom);
|
|
#StdOut
|
|
rect: 30.5, 50.5, 20.5, 10.5
|
|
sorted: 20.5, 10.5, 30.5, 50.5
|
|
##
|
|
##
|
|
|
|
#SeeAlso sort SkIRect::makeSorted
|
|
|
|
##
|
|
|
|
# ------------------------------------------------------------------------------
|
|
|
|
#Method const SkScalar* asScalars() const
|
|
|
|
Returns pointer to first Scalar in Rect, to treat it as an array with four
|
|
entries.
|
|
|
|
#Return pointer to fLeft ##
|
|
|
|
#Example
|
|
SkRect rect = {7, 11, 13, 17};
|
|
SkDebugf("rect.asScalars() %c= &rect.fLeft\n", rect.asScalars() == &rect.fLeft? '=' : '!');
|
|
#StdOut
|
|
rect.asScalars() == &rect.fLeft
|
|
##
|
|
##
|
|
|
|
#SeeAlso toQuad
|
|
|
|
##
|
|
|
|
# ------------------------------------------------------------------------------
|
|
|
|
#Method void dump(bool asHex) const
|
|
|
|
Writes text representation of Rect to standard output. Set asHex to true to
|
|
generate exact binary representations of floating point numbers.
|
|
|
|
#Param asHex true if SkScalar values are written as hexadecimal ##
|
|
|
|
#Example
|
|
SkRect rect = {20, 30, 40, 50};
|
|
for (bool dumpAsHex : { false, true } ) {
|
|
rect.dump(dumpAsHex);
|
|
SkDebugf("\n");
|
|
}
|
|
#StdOut
|
|
SkRect::MakeLTRB(20, 30, 40, 50);
|
|
|
|
SkRect::MakeLTRB(SkBits2Float(0x41a00000), /* 20.000000 */
|
|
SkBits2Float(0x41f00000), /* 30.000000 */
|
|
SkBits2Float(0x42200000), /* 40.000000 */
|
|
SkBits2Float(0x42480000) /* 50.000000 */);
|
|
##
|
|
##
|
|
|
|
#SeeAlso dumpHex
|
|
|
|
##
|
|
|
|
# ------------------------------------------------------------------------------
|
|
|
|
#Method void dump() const
|
|
|
|
Writes text representation of Rect to standard output. The representation may be
|
|
directly compiled as C++ code. Floating point values are written
|
|
with limited precision; it may not be possible to reconstruct original Rect
|
|
from output.
|
|
|
|
#Example
|
|
SkRect rect = {6.f / 7, 2.f / 3, 26.f / 10, 42.f / 6};
|
|
rect.dump();
|
|
SkRect copy = SkRect::MakeLTRB(0.857143f, 0.666667f, 2.6f, 7);
|
|
SkDebugf("rect is " "%s" "equal to copy\n", rect == copy ? "" : "not ");
|
|
#StdOut
|
|
SkRect::MakeLTRB(0.857143f, 0.666667f, 2.6f, 7);
|
|
rect is not equal to copy
|
|
##
|
|
##
|
|
|
|
#SeeAlso dumpHex
|
|
|
|
##
|
|
|
|
# ------------------------------------------------------------------------------
|
|
|
|
#Method void dumpHex() const
|
|
|
|
Writes text representation of Rect to standard output. The representation may be
|
|
directly compiled as C++ code. Floating point values are written
|
|
in hexadecimal to preserve their exact bit pattern. The output reconstructs the
|
|
original Rect.
|
|
|
|
Use instead of dump() when submitting
|
|
#A bug reports against Skia # http://bug.skia.org ##
|
|
.
|
|
|
|
#Example
|
|
SkRect rect = {6.f / 7, 2.f / 3, 26.f / 10, 42.f / 6};
|
|
rect.dumpHex();
|
|
SkRect copy = SkRect::MakeLTRB(SkBits2Float(0x3f5b6db7), /* 0.857143 */
|
|
SkBits2Float(0x3f2aaaab), /* 0.666667 */
|
|
SkBits2Float(0x40266666), /* 2.600000 */
|
|
SkBits2Float(0x40e00000) /* 7.000000 */);
|
|
SkDebugf("rect is " "%s" "equal to copy\n", rect == copy ? "" : "not ");
|
|
#StdOut
|
|
SkRect::MakeLTRB(SkBits2Float(0x3f5b6db7), /* 0.857143 */
|
|
SkBits2Float(0x3f2aaaab), /* 0.666667 */
|
|
SkBits2Float(0x40266666), /* 2.600000 */
|
|
SkBits2Float(0x40e00000) /* 7.000000 */);
|
|
rect is equal to copy
|
|
##
|
|
##
|
|
|
|
#SeeAlso dump
|
|
|
|
##
|
|
|
|
#Struct SkRect ##
|
|
|
|
#Topic Rect ##
|