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+/*
+ * Copyright (C) 2006 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef SkPoint_DEFINED
+#define SkPoint_DEFINED
+
+#include "SkMath.h"
+#include "SkScalar.h"
+
+/** \struct SkIPoint
+
+ SkIPoint holds two 32 bit integer coordinates
+*/
+struct SkIPoint {
+ int32_t fX, fY;
+
+ /** Set the x and y values of the point. */
+ void set(int32_t x, int32_t y) { fX = x; fY = y; }
+
+ /** Rotate the point clockwise, writing the new point into dst
+ It is legal for dst == this
+ */
+ void rotateCW(SkIPoint* dst) const;
+
+ /** Rotate the point clockwise, writing the new point back into the point
+ */
+
+ void rotateCW() { this->rotateCW(this); }
+
+ /** Rotate the point counter-clockwise, writing the new point into dst.
+ It is legal for dst == this
+ */
+ void rotateCCW(SkIPoint* dst) const;
+
+ /** Rotate the point counter-clockwise, writing the new point back into
+ the point
+ */
+ void rotateCCW() { this->rotateCCW(this); }
+
+ /** Negate the X and Y coordinates of the point.
+ */
+ void negate() { fX = -fX; fY = -fY; }
+
+ /** Return a new point whose X and Y coordinates are the negative of the
+ original point's
+ */
+ SkIPoint operator-() const {
+ SkIPoint neg;
+ neg.fX = -fX;
+ neg.fY = -fY;
+ return neg;
+ }
+
+ /** Add v's coordinates to this point's */
+ void operator+=(const SkIPoint& v) {
+ fX += v.fX;
+ fY += v.fY;
+ }
+
+ /** Subtract v's coordinates from this point's */
+ void operator-=(const SkIPoint& v) {
+ fX -= v.fX;
+ fY -= v.fY;
+ }
+
+ /** Returns true if the point's coordinates equal (x,y) */
+ bool equals(int32_t x, int32_t y) const {
+ return fX == x && fY == y;
+ }
+
+ friend bool operator==(const SkIPoint& a, const SkIPoint& b) {
+ return a.fX == b.fX && a.fY == b.fY;
+ }
+
+ friend bool operator!=(const SkIPoint& a, const SkIPoint& b) {
+ return a.fX != b.fX || a.fY != b.fY;
+ }
+
+ /** Returns a new point whose coordinates are the difference between
+ a and b (i.e. a - b)
+ */
+ friend SkIPoint operator-(const SkIPoint& a, const SkIPoint& b) {
+ SkIPoint v;
+ v.set(a.fX - b.fX, a.fY - b.fY);
+ return v;
+ }
+
+ /** Returns a new point whose coordinates are the sum of a and b (a + b)
+ */
+ friend SkIPoint operator+(const SkIPoint& a, const SkIPoint& b) {
+ SkIPoint v;
+ v.set(a.fX + b.fX, a.fY + b.fY);
+ return v;
+ }
+
+ /** Returns the dot product of a and b, treating them as 2D vectors
+ */
+ static int32_t DotProduct(const SkIPoint& a, const SkIPoint& b) {
+ return a.fX * b.fX + a.fY * b.fY;
+ }
+
+ /** Returns the cross product of a and b, treating them as 2D vectors
+ */
+ static int32_t CrossProduct(const SkIPoint& a, const SkIPoint& b) {
+ return a.fX * b.fY - a.fY * b.fX;
+ }
+};
+
+struct SkPoint {
+ SkScalar fX, fY;
+
+ /** Set the point's X and Y coordinates */
+ void set(SkScalar x, SkScalar y) { fX = x; fY = y; }
+
+ /** Set the point's X and Y coordinates by automatically promoting (x,y) to
+ SkScalar values.
+ */
+ void iset(int32_t x, int32_t y) {
+ fX = SkIntToScalar(x);
+ fY = SkIntToScalar(y);
+ }
+
+ /** Set the point's X and Y coordinates by automatically promoting p's
+ coordinates to SkScalar values.
+ */
+ void iset(const SkIPoint& p) {
+ fX = SkIntToScalar(p.fX);
+ fY = SkIntToScalar(p.fY);
+ }
+
+ /** Return the euclidian distance from (0,0) to the point
+ */
+ SkScalar length() const { return SkPoint::Length(fX, fY); }
+
+ /** Set the point (vector) to be unit-length in the same direction as it
+ currently is, and return its old length. If the old length is
+ degenerately small (nearly zero), do nothing and return false, otherwise
+ return true.
+ */
+ bool normalize();
+
+ /** Set the point (vector) to be unit-length in the same direction as the
+ x,y params. If the vector (x,y) has a degenerate length (i.e. nearly 0)
+ then return false and do nothing, otherwise return true.
+ */
+ bool setNormalize(SkScalar x, SkScalar y);
+
+ /** Scale the point (vector) to have the specified length, and return that
+ length. If the original length is degenerately small (nearly zero),
+ do nothing and return false, otherwise return true.
+ */
+ bool setLength(SkScalar length);
+
+ /** Set the point (vector) to have the specified length in the same
+ direction as (x,y). If the vector (x,y) has a degenerate length
+ (i.e. nearly 0) then return false and do nothing, otherwise return true.
+ */
+ bool setLength(SkScalar x, SkScalar y, SkScalar length);
+
+ /** Scale the point's coordinates by scale, writing the answer into dst.
+ It is legal for dst == this.
+ */
+ void scale(SkScalar scale, SkPoint* dst) const;
+
+ /** Scale the point's coordinates by scale, writing the answer back into
+ the point.
+ */
+ void scale(SkScalar scale) { this->scale(scale, this); }
+
+ /** Rotate the point clockwise by 90 degrees, writing the answer into dst.
+ It is legal for dst == this.
+ */
+ void rotateCW(SkPoint* dst) const;
+
+ /** Rotate the point clockwise by 90 degrees, writing the answer back into
+ the point.
+ */
+ void rotateCW() { this->rotateCW(this); }
+
+ /** Rotate the point counter-clockwise by 90 degrees, writing the answer
+ into dst. It is legal for dst == this.
+ */
+ void rotateCCW(SkPoint* dst) const;
+
+ /** Rotate the point counter-clockwise by 90 degrees, writing the answer
+ back into the point.
+ */
+ void rotateCCW() { this->rotateCCW(this); }
+
+ /** Negate the point's coordinates
+ */
+ void negate() {
+ fX = -fX;
+ fY = -fY;
+ }
+
+ /** Returns a new point whose coordinates are the negative of the point's
+ */
+ SkPoint operator-() const {
+ SkPoint neg;
+ neg.fX = -fX;
+ neg.fY = -fY;
+ return neg;
+ }
+
+ /** Add v's coordinates to the point's
+ */
+ void operator+=(const SkPoint& v) {
+ fX += v.fX;
+ fY += v.fY;
+ }
+
+ /** Subtract v's coordinates from the point's
+ */
+ void operator-=(const SkPoint& v) {
+ fX -= v.fX;
+ fY -= v.fY;
+ }
+
+ /** Returns true if the point's coordinates equal (x,y)
+ */
+ bool equals(SkScalar x, SkScalar y) const { return fX == x && fY == y; }
+
+ friend bool operator==(const SkPoint& a, const SkPoint& b) {
+ return a.fX == b.fX && a.fY == b.fY;
+ }
+
+ friend bool operator!=(const SkPoint& a, const SkPoint& b) {
+ return a.fX != b.fX || a.fY != b.fY;
+ }
+
+ /** Returns a new point whose coordinates are the difference between
+ a's and b's (a - b)
+ */
+ friend SkPoint operator-(const SkPoint& a, const SkPoint& b) {
+ SkPoint v;
+ v.set(a.fX - b.fX, a.fY - b.fY);
+ return v;
+ }
+
+ /** Returns a new point whose coordinates are the sum of a's and b's (a + b)
+ */
+ friend SkPoint operator+(const SkPoint& a, const SkPoint& b) {
+ SkPoint v;
+ v.set(a.fX + b.fX, a.fY + b.fY);
+ return v;
+ }
+
+ /** Returns the euclidian distance from (0,0) to (x,y)
+ */
+ static SkScalar Length(SkScalar x, SkScalar y);
+
+ /** Returns the euclidian distance between a and b
+ */
+ static SkScalar Distance(const SkPoint& a, const SkPoint& b) {
+ return Length(a.fX - b.fX, a.fY - b.fY);
+ }
+
+ /** Returns the dot product of a and b, treating them as 2D vectors
+ */
+ static SkScalar DotProduct(const SkPoint& a, const SkPoint& b) {
+ return SkScalarMul(a.fX, b.fX) + SkScalarMul(a.fY, b.fY);
+ }
+
+ /** Returns the cross product of a and b, treating them as 2D vectors
+ */
+ static SkScalar CrossProduct(const SkPoint& a, const SkPoint& b) {
+ return SkScalarMul(a.fX, b.fY) - SkScalarMul(a.fY, b.fX);
+ }
+};
+
+typedef SkPoint SkVector;
+
+#endif
+