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89 lines
1.8 KiB
C++
89 lines
1.8 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* vim:set ts=2 sw=2 sts=2 et cindent: */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#ifndef ThreeDPoint_h_
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#define ThreeDPoint_h_
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#include <cmath>
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#include <algorithm>
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namespace mozilla {
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namespace dom {
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struct ThreeDPoint {
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ThreeDPoint()
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: x(0.)
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, y(0.)
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, z(0.)
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{
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}
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ThreeDPoint(double aX, double aY, double aZ)
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: x(aX)
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, y(aY)
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, z(aZ)
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{
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}
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double Magnitude() const
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{
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return sqrt(x * x + y * y + z * z);
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}
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void Normalize()
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{
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// Normalize with the maximum norm first to avoid overflow and underflow.
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double invMax = 1 / MaxNorm();
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x *= invMax;
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y *= invMax;
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z *= invMax;
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double invDistance = 1 / Magnitude();
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x *= invDistance;
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y *= invDistance;
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z *= invDistance;
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}
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ThreeDPoint CrossProduct(const ThreeDPoint& rhs) const
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{
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return ThreeDPoint(y * rhs.z - z * rhs.y,
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z * rhs.x - x * rhs.z,
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x * rhs.y - y * rhs.x);
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}
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double DotProduct(const ThreeDPoint& rhs)
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{
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return x * rhs.x + y * rhs.y + z * rhs.z;
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}
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bool IsZero() const
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{
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return x == 0 && y == 0 && z == 0;
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}
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// For comparing two vectors of close to unit magnitude.
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bool FuzzyEqual(const ThreeDPoint& other);
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double x, y, z;
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private:
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double MaxNorm() const
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{
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return std::max(fabs(x), std::max(fabs(y), fabs(z)));
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}
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};
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ThreeDPoint operator-(const ThreeDPoint& lhs, const ThreeDPoint& rhs);
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ThreeDPoint operator*(const ThreeDPoint& lhs, const ThreeDPoint& rhs);
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ThreeDPoint operator*(const ThreeDPoint& lhs, const double rhs);
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bool operator==(const ThreeDPoint& lhs, const ThreeDPoint& rhs);
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}
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}
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#endif
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