1 | // |
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2 | // vector3.cc |
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3 | // |
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4 | // C++ class for 3-element vectors |
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5 | // |
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6 | // Copyright (C) 2000-2001, Mark R. Shinwell. |
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7 | // Copyright (C) 2002-2003 Olly Betts |
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8 | // |
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9 | // This program is free software; you can redistribute it and/or modify |
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10 | // it under the terms of the GNU General Public License as published by |
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11 | // the Free Software Foundation; either version 2 of the License, or |
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12 | // (at your option) any later version. |
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13 | // |
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14 | // This program is distributed in the hope that it will be useful, |
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15 | // but WITHOUT ANY WARRANTY; without even the implied warranty of |
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16 | // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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17 | // GNU General Public License for more details. |
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18 | // |
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19 | // You should have received a copy of the GNU General Public License |
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20 | // along with this program; if not, write to the Free Software |
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21 | // Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
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22 | // |
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23 | |
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24 | #ifdef HAVE_CONFIG_H |
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25 | #include <config.h> |
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26 | #endif |
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27 | |
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28 | #include "vector3.h" |
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29 | |
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30 | #include <math.h> |
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31 | |
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32 | void Vector3::normalise() |
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33 | { |
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34 | double mag = magnitude(); |
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35 | if (mag != 0.0) { |
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36 | x /= mag; |
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37 | y /= mag; |
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38 | z /= mag; |
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39 | } |
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40 | } |
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41 | |
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42 | double dot(const Vector3& left, const Vector3& right) |
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43 | { |
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44 | return left.x*right.x + left.y*right.y + left.z*right.z; |
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45 | } |
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46 | |
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47 | Vector3& Vector3::operator*=(const double f) |
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48 | { |
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49 | x *= f; |
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50 | y *= f; |
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51 | z *= f; |
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52 | |
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53 | return *this; |
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54 | } |
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55 | |
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56 | Vector3& Vector3::operator/=(const double f) |
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57 | { |
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58 | x /= f; |
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59 | y /= f; |
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60 | z /= f; |
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61 | |
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62 | return *this; |
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63 | } |
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64 | |
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65 | Vector3& Vector3::operator+=(const Vector3 &v) |
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66 | { |
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67 | x += v.x; |
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68 | y += v.y; |
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69 | z += v.z; |
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70 | |
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71 | return *this; |
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72 | } |
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73 | |
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74 | Vector3& Vector3::operator-=(const Vector3 &v) |
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75 | { |
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76 | x -= v.x; |
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77 | y -= v.y; |
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78 | z -= v.z; |
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79 | |
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80 | return *this; |
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81 | } |
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82 | |
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83 | Vector3 operator*(const double f, const Vector3& v) |
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84 | { |
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85 | Vector3 o; |
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86 | o.x = v.x * f; |
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87 | o.y = v.y * f; |
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88 | o.z = v.z * f; |
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89 | |
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90 | return o; |
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91 | } |
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92 | |
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93 | Vector3 operator*(const Vector3& v1, const Vector3& v2) |
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94 | { |
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95 | // Cross product. |
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96 | |
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97 | Vector3 o; |
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98 | o.x = v1.y*v2.z - v1.z*v2.y; |
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99 | o.y = v1.z*v2.x - v1.x*v2.z; |
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100 | o.z = v1.x*v2.y - v1.y*v2.x; |
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101 | |
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102 | return o; |
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103 | } |
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104 | |
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105 | Vector3 operator+(const Vector3& v1, const Vector3& v2) |
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106 | { |
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107 | Vector3 o; |
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108 | o.x = v1.x + v2.x; |
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109 | o.y = v1.y + v2.y; |
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110 | o.z = v1.z + v2.z; |
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111 | |
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112 | return o; |
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113 | } |
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114 | |
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115 | Vector3 operator-(const Vector3& v1, const Vector3& v2) |
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116 | { |
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117 | Vector3 o; |
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118 | o.x = v1.x - v2.x; |
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119 | o.y = v1.y - v2.y; |
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120 | o.z = v1.z - v2.z; |
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121 | |
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122 | return o; |
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123 | } |
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