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- /*
- * Copyright 2015 Google Inc.
- *
- * Use of this source code is governed by a BSD-style license that can be
- * found in the LICENSE file.
- */
- #ifndef SkPoint3_DEFINED
- #define SkPoint3_DEFINED
- #include "include/core/SkPoint.h"
- struct SK_API SkPoint3 {
- SkScalar fX, fY, fZ;
- static SkPoint3 Make(SkScalar x, SkScalar y, SkScalar z) {
- SkPoint3 pt;
- pt.set(x, y, z);
- return pt;
- }
- SkScalar x() const { return fX; }
- SkScalar y() const { return fY; }
- SkScalar z() const { return fZ; }
- void set(SkScalar x, SkScalar y, SkScalar z) { fX = x; fY = y; fZ = z; }
- friend bool operator==(const SkPoint3& a, const SkPoint3& b) {
- return a.fX == b.fX && a.fY == b.fY && a.fZ == b.fZ;
- }
- friend bool operator!=(const SkPoint3& a, const SkPoint3& b) {
- return !(a == b);
- }
- /** Returns the Euclidian distance from (0,0,0) to (x,y,z)
- */
- static SkScalar Length(SkScalar x, SkScalar y, SkScalar z);
- /** Return the Euclidian distance from (0,0,0) to the point
- */
- SkScalar length() const { return SkPoint3::Length(fX, fY, fZ); }
- /** Set the point (vector) to be unit-length in the same direction as it
- already points. If the point has a degenerate length (i.e., nearly 0)
- then set it to (0,0,0) and return false; otherwise return true.
- */
- bool normalize();
- /** Return a new point whose X, Y and Z coordinates are scaled.
- */
- SkPoint3 makeScale(SkScalar scale) const {
- SkPoint3 p;
- p.set(scale * fX, scale * fY, scale * fZ);
- return p;
- }
- /** Scale the point's coordinates by scale.
- */
- void scale(SkScalar value) {
- fX *= value;
- fY *= value;
- fZ *= value;
- }
- /** Return a new point whose X, Y and Z coordinates are the negative of the
- original point's
- */
- SkPoint3 operator-() const {
- SkPoint3 neg;
- neg.fX = -fX;
- neg.fY = -fY;
- neg.fZ = -fZ;
- return neg;
- }
- /** Returns a new point whose coordinates are the difference between
- a and b (i.e., a - b)
- */
- friend SkPoint3 operator-(const SkPoint3& a, const SkPoint3& b) {
- SkPoint3 v;
- v.set(a.fX - b.fX, a.fY - b.fY, a.fZ - b.fZ);
- return v;
- }
- /** Returns a new point whose coordinates are the sum of a and b (a + b)
- */
- friend SkPoint3 operator+(const SkPoint3& a, const SkPoint3& b) {
- SkPoint3 v;
- v.set(a.fX + b.fX, a.fY + b.fY, a.fZ + b.fZ);
- return v;
- }
- /** Add v's coordinates to the point's
- */
- void operator+=(const SkPoint3& v) {
- fX += v.fX;
- fY += v.fY;
- fZ += v.fZ;
- }
- /** Subtract v's coordinates from the point's
- */
- void operator-=(const SkPoint3& v) {
- fX -= v.fX;
- fY -= v.fY;
- fZ -= v.fZ;
- }
- /** Returns true if fX, fY, and fZ are measurable values.
- @return true for values other than infinities and NaN
- */
- bool isFinite() const {
- SkScalar accum = 0;
- accum *= fX;
- accum *= fY;
- accum *= fZ;
- // accum is either NaN or it is finite (zero).
- SkASSERT(0 == accum || SkScalarIsNaN(accum));
- // value==value will be true iff value is not NaN
- // TODO: is it faster to say !accum or accum==accum?
- return !SkScalarIsNaN(accum);
- }
- /** Returns the dot product of a and b, treating them as 3D vectors
- */
- static SkScalar DotProduct(const SkPoint3& a, const SkPoint3& b) {
- return a.fX * b.fX + a.fY * b.fY + a.fZ * b.fZ;
- }
- SkScalar dot(const SkPoint3& vec) const {
- return DotProduct(*this, vec);
- }
- /** Returns the cross product of a and b, treating them as 3D vectors
- */
- static SkPoint3 CrossProduct(const SkPoint3& a, const SkPoint3& b) {
- SkPoint3 result;
- result.fX = a.fY*b.fZ - a.fZ*b.fY;
- result.fY = a.fZ*b.fX - a.fX*b.fZ;
- result.fZ = a.fX*b.fY - a.fY*b.fX;
- return result;
- }
- SkPoint3 cross(const SkPoint3& vec) const {
- return CrossProduct(*this, vec);
- }
- };
- typedef SkPoint3 SkVector3;
- typedef SkPoint3 SkColor3f;
- #endif
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