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comparison: content/media/webaudio/ThreeDPoint.h
content/media/webaudio/ThreeDPoint.h
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| 1 /* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */ | |
| 2 /* vim:set ts=2 sw=2 sts=2 et cindent: */ | |
| 3 /* This Source Code Form is subject to the terms of the Mozilla Public | |
| 4 * License, v. 2.0. If a copy of the MPL was not distributed with this | |
| 5 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */ | |
| 6 | |
| 7 #ifndef ThreeDPoint_h_ | |
| 8 #define ThreeDPoint_h_ | |
| 9 | |
| 10 #include <cmath> | |
| 11 #include <algorithm> | |
| 12 | |
| 13 namespace mozilla { | |
| 14 | |
| 15 namespace dom { | |
| 16 | |
| 17 struct ThreeDPoint { | |
| 18 ThreeDPoint() | |
| 19 : x(0.) | |
| 20 , y(0.) | |
| 21 , z(0.) | |
| 22 { | |
| 23 } | |
| 24 ThreeDPoint(double aX, double aY, double aZ) | |
| 25 : x(aX) | |
| 26 , y(aY) | |
| 27 , z(aZ) | |
| 28 { | |
| 29 } | |
| 30 | |
| 31 double Magnitude() const | |
| 32 { | |
| 33 return sqrt(x * x + y * y + z * z); | |
| 34 } | |
| 35 | |
| 36 void Normalize() | |
| 37 { | |
| 38 // Normalize with the maximum norm first to avoid overflow and underflow. | |
| 39 double invMax = 1 / MaxNorm(); | |
| 40 x *= invMax; | |
| 41 y *= invMax; | |
| 42 z *= invMax; | |
| 43 | |
| 44 double invDistance = 1 / Magnitude(); | |
| 45 x *= invDistance; | |
| 46 y *= invDistance; | |
| 47 z *= invDistance; | |
| 48 } | |
| 49 | |
| 50 ThreeDPoint CrossProduct(const ThreeDPoint& rhs) const | |
| 51 { | |
| 52 return ThreeDPoint(y * rhs.z - z * rhs.y, | |
| 53 z * rhs.x - x * rhs.z, | |
| 54 x * rhs.y - y * rhs.x); | |
| 55 } | |
| 56 | |
| 57 double DotProduct(const ThreeDPoint& rhs) | |
| 58 { | |
| 59 return x * rhs.x + y * rhs.y + z * rhs.z; | |
| 60 } | |
| 61 | |
| 62 bool IsZero() const | |
| 63 { | |
| 64 return x == 0 && y == 0 && z == 0; | |
| 65 } | |
| 66 | |
| 67 // For comparing two vectors of close to unit magnitude. | |
| 68 bool FuzzyEqual(const ThreeDPoint& other); | |
| 69 | |
| 70 double x, y, z; | |
| 71 | |
| 72 private: | |
| 73 double MaxNorm() const | |
| 74 { | |
| 75 return std::max(fabs(x), std::max(fabs(y), fabs(z))); | |
| 76 } | |
| 77 }; | |
| 78 | |
| 79 ThreeDPoint operator-(const ThreeDPoint& lhs, const ThreeDPoint& rhs); | |
| 80 ThreeDPoint operator*(const ThreeDPoint& lhs, const ThreeDPoint& rhs); | |
| 81 ThreeDPoint operator*(const ThreeDPoint& lhs, const double rhs); | |
| 82 bool operator==(const ThreeDPoint& lhs, const ThreeDPoint& rhs); | |
| 83 | |
| 84 } | |
| 85 } | |
| 86 | |
| 87 #endif | |
| 88 |
