skia2/site/user/api/SkIPoint_Reference.md

SkIPoint Reference

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struct SkIPoint {
    int32_t fX;
    int32_t fY;

    static constexpr SkIPoint Make(int32_t x, int32_t y);
    int32_t x() const;
    int32_t y() const;
    bool isZero() const;
    void set(int32_t x, int32_t y);
    SkIPoint operator-()_const;
    void operator+=(const SkIVector& v);
    void operator-=(const SkIVector& v);
    bool equals(int32_t x, int32_t y) const;
    friend bool operator==(const SkIPoint& a, const SkIPoint& b);
    friend bool operator!=(const SkIPoint& a, const SkIPoint& b);
    friend SkIVector operator-(const SkIPoint& a, const SkIPoint& b);
    friend SkIPoint operator+(const SkIPoint& a, const SkIVector& b);
};

SkIPoint holds two 32-bit integer coordinates.

Type	Member	Description
int32_t	fX	x-axis value used by IPoint.
int32_t	fY	y-axis value used by IPoint.

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static constexpr SkIPoint Make(int32_t x, int32_t y)

Sets fX to x, fY to y.

Parameters

x	integer x-axis value of constructed SkIPoint
y	integer y-axis value of constructed SkIPoint

Return Value

SkIPoint (x, y)

Example

Example Output

pt1 == pt2

See Also

set() SkPoint::iset^[2]() SkPoint::Make

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int32_t x() const

Returns x-axis value of SkIPoint.

Return Value

fX

Example

Example Output

pt1.fX == pt1.x()

See Also

y() SkPoint::x()

---

int32_t y() const

Returns y-axis value of SkIPoint.

Return Value

fY

Example

Example Output

pt1.fY == pt1.y()

See Also

x() SkPoint::y()

---

bool isZero() const

Returns true if fX and fY are both zero.

Return Value

true if fX is zero and fY is zero

Example

Example Output

pt.isZero() == true

See Also

SkPoint::isZero

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void set(int32_t x, int32_t y)

Sets fX to x and fY to y.

Parameters

x	new value for fX
y	new value for fY

Example

Example Output

pt1 == pt2

See Also

Make

---

SkIPoint operator-() const

Returns SkIPoint changing the signs of fX and fY.

Return Value

SkIPoint as (-fX, -fY)

Example

Example Output

pt: 0, 0  negate: 0, 0
pt: -1, -2  negate: 1, 2
pt: 2147483647, -2147483647  negate: -2147483647, 2147483647
pt: -2147483648, -2147483648  negate: -2147483648, -2147483648

See Also

operator-(const SkIPoint& a, const SkIPoint& b) operator-=(const SkIVector& v) SkPoint::operator-() const

---

void operator+=(const SkIVector& v)

Offsets IPoint by IVector v. Sets IPoint to (fX + v.fX, fY + v.fY).

Parameters

v	IVector to add

Example

See Also

operator+(const SkIPoint& a, const SkIVector& b) SkPoint::operator+=(const SkVector& v)

---

void operator-=(const SkIVector& v)

Subtracts IVector v from IPoint. Sets IPoint to: (fX - v.fX, fY - v.fY).

Parameters

v	IVector to subtract

Example

See Also

operator-(const SkIPoint& a, const SkIPoint& b) SkPoint::operator-=(const SkVector& v)

---

bool equals(int32_t x, int32_t y) const

Returns true if SkIPoint is equivalent to SkIPoint constructed from (x, y).

Parameters

x	value compared with fX
y	value compared with fY

Return Value

true if SkIPoint equals (x, y)

Example

Example Output

pt: 0, 0  == pt
pt: -1, -2  == pt
pt: 2147483647, -1  == pt
pt: -2147483648, -1  == pt

See Also

operator==(const SkIPoint& a, const SkIPoint& b)

---

bool operator==(const SkIPoint& a, const SkIPoint& b)

Returns true if a is equivalent to b.

Parameters

a	SkIPoint to compare
b	SkIPoint to compare

Return Value

true if a.fX == b.fX and a.fY == b.fY

Example

Example Output

pt: 0, 0  == pt
pt: -1, -2  == pt
pt: 2147483647, -1  == pt
pt: -2147483648, -1  == pt

See Also

equals() operator!=(const SkIPoint& a, const SkIPoint& b)

---

bool operator!=(const SkIPoint& a, const SkIPoint& b)

Returns true if a is not equivalent to b.

Parameters

a	SkIPoint to compare
b	SkIPoint to compare

Return Value

true if a.fX != b.fX or a.fY != b.fY

Example

Example Output

pt: 0, 0  == pt
pt: -1, -2  == pt
pt: 2147483647, -1  == pt
pt: -2147483648, -1  == pt

See Also

operator==(const SkIPoint& a, const SkIPoint& b) equals()

---

SkIVector operator-(const SkIPoint& a, const SkIPoint& b)

Returns IVector from b to a; computed as (a.fX - b.fX, a.fY - b.fY).

Can also be used to subtract IVector from IVector, returning IVector.

Parameters

a	IPoint or IVector to subtract from
b	IVector to subtract

Return Value

IVector from b to a

Example

See Also

operator-=(const SkIVector& v)

---

SkIPoint operator+(const SkIPoint& a, const SkIVector& b)

Returns IPoint resulting from IPoint a offset by IVector b, computed as: (a.fX + b.fX, a.fY + b.fY).

Can also be used to offset IPoint b by IVector a, returning IPoint. Can also be used to add IVector to IVector, returning IVector.

Parameters

a	IPoint or IVector to add to
b	IPoint or IVector to add

Return Value

IPoint equal to a offset by b

Example

See Also

operator+=(const SkIVector& v)

---

    typedef SkIPoint SkIVector;

SkIVector provides an alternative name for SkIPoint. SkIVector and SkIPoint can be used interchangeably for all purposes.