1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/content/media/webaudio/ThreeDPoint.h Wed Dec 31 06:09:35 2014 +0100
1.3 @@ -0,0 +1,88 @@
1.4 +/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
1.5 +/* vim:set ts=2 sw=2 sts=2 et cindent: */
1.6 +/* This Source Code Form is subject to the terms of the Mozilla Public
1.7 + * License, v. 2.0. If a copy of the MPL was not distributed with this
1.8 + * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
1.9 +
1.10 +#ifndef ThreeDPoint_h_
1.11 +#define ThreeDPoint_h_
1.12 +
1.13 +#include <cmath>
1.14 +#include <algorithm>
1.15 +
1.16 +namespace mozilla {
1.17 +
1.18 +namespace dom {
1.19 +
1.20 +struct ThreeDPoint {
1.21 + ThreeDPoint()
1.22 + : x(0.)
1.23 + , y(0.)
1.24 + , z(0.)
1.25 + {
1.26 + }
1.27 + ThreeDPoint(double aX, double aY, double aZ)
1.28 + : x(aX)
1.29 + , y(aY)
1.30 + , z(aZ)
1.31 + {
1.32 + }
1.33 +
1.34 + double Magnitude() const
1.35 + {
1.36 + return sqrt(x * x + y * y + z * z);
1.37 + }
1.38 +
1.39 + void Normalize()
1.40 + {
1.41 + // Normalize with the maximum norm first to avoid overflow and underflow.
1.42 + double invMax = 1 / MaxNorm();
1.43 + x *= invMax;
1.44 + y *= invMax;
1.45 + z *= invMax;
1.46 +
1.47 + double invDistance = 1 / Magnitude();
1.48 + x *= invDistance;
1.49 + y *= invDistance;
1.50 + z *= invDistance;
1.51 + }
1.52 +
1.53 + ThreeDPoint CrossProduct(const ThreeDPoint& rhs) const
1.54 + {
1.55 + return ThreeDPoint(y * rhs.z - z * rhs.y,
1.56 + z * rhs.x - x * rhs.z,
1.57 + x * rhs.y - y * rhs.x);
1.58 + }
1.59 +
1.60 + double DotProduct(const ThreeDPoint& rhs)
1.61 + {
1.62 + return x * rhs.x + y * rhs.y + z * rhs.z;
1.63 + }
1.64 +
1.65 + bool IsZero() const
1.66 + {
1.67 + return x == 0 && y == 0 && z == 0;
1.68 + }
1.69 +
1.70 + // For comparing two vectors of close to unit magnitude.
1.71 + bool FuzzyEqual(const ThreeDPoint& other);
1.72 +
1.73 + double x, y, z;
1.74 +
1.75 +private:
1.76 + double MaxNorm() const
1.77 + {
1.78 + return std::max(fabs(x), std::max(fabs(y), fabs(z)));
1.79 + }
1.80 +};
1.81 +
1.82 +ThreeDPoint operator-(const ThreeDPoint& lhs, const ThreeDPoint& rhs);
1.83 +ThreeDPoint operator*(const ThreeDPoint& lhs, const ThreeDPoint& rhs);
1.84 +ThreeDPoint operator*(const ThreeDPoint& lhs, const double rhs);
1.85 +bool operator==(const ThreeDPoint& lhs, const ThreeDPoint& rhs);
1.86 +
1.87 +}
1.88 +}
1.89 +
1.90 +#endif
1.91 +
