1 | /* -*-c++-*- OpenSceneGraph - Copyright (C) 1998-2006 Robert Osfield |
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2 | * |
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3 | * This library is open source and may be redistributed and/or modified under |
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4 | * the terms of the OpenSceneGraph Public License (OSGPL) version 0.0 or |
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5 | * (at your option) any later version. The full license is in LICENSE file |
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6 | * included with this distribution, and on the openscenegraph.org website. |
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7 | * |
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8 | * This library is distributed in the hope that it will be useful, |
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9 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
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10 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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11 | * OpenSceneGraph Public License for more details. |
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12 | */ |
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13 | |
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14 | #ifndef OSG_VEC2F |
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15 | #define OSG_VEC2F 1 |
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16 | |
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17 | #include <osg/Math> |
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18 | |
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19 | namespace osg { |
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20 | |
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21 | /** General purpose float pair. Uses include representation of |
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22 | * texture coordinates. |
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23 | * No support yet added for float * Vec2f - is it necessary? |
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24 | * Need to define a non-member non-friend operator* etc. |
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25 | * BTW: Vec2f * float is okay |
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26 | */ |
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27 | |
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28 | class Vec2f |
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29 | { |
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30 | public: |
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31 | |
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32 | /** Type of Vec class.*/ |
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33 | typedef float value_type; |
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34 | |
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35 | /** Number of vector components. */ |
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36 | enum { num_components = 2 }; |
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37 | |
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38 | /** Vec member varaible. */ |
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39 | value_type _v[2]; |
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40 | |
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41 | |
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42 | Vec2f() {_v[0]=0.0; _v[1]=0.0;} |
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43 | Vec2f(value_type x,value_type y) { _v[0]=x; _v[1]=y; } |
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44 | |
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45 | |
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46 | inline bool operator == (const Vec2f& v) const { return _v[0]==v._v[0] && _v[1]==v._v[1]; } |
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47 | |
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48 | inline bool operator != (const Vec2f& v) const { return _v[0]!=v._v[0] || _v[1]!=v._v[1]; } |
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49 | |
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50 | inline bool operator < (const Vec2f& v) const |
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51 | { |
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52 | if (_v[0]<v._v[0]) return true; |
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53 | else if (_v[0]>v._v[0]) return false; |
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54 | else return (_v[1]<v._v[1]); |
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55 | } |
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56 | |
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57 | inline value_type * ptr() { return _v; } |
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58 | inline const value_type * ptr() const { return _v; } |
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59 | |
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60 | inline void set( value_type x, value_type y ) { _v[0]=x; _v[1]=y; } |
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61 | |
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62 | inline value_type & operator [] (int i) { return _v[i]; } |
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63 | inline value_type operator [] (int i) const { return _v[i]; } |
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64 | |
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65 | inline value_type & x() { return _v[0]; } |
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66 | inline value_type & y() { return _v[1]; } |
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67 | |
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68 | inline value_type x() const { return _v[0]; } |
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69 | inline value_type y() const { return _v[1]; } |
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70 | |
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71 | inline bool valid() const { return !isNaN(); } |
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72 | inline bool isNaN() const { return osg::isNaN(_v[0]) || osg::isNaN(_v[1]); } |
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73 | |
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74 | /** Dot product. */ |
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75 | inline value_type operator * (const Vec2f& rhs) const |
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76 | { |
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77 | return _v[0]*rhs._v[0]+_v[1]*rhs._v[1]; |
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78 | } |
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79 | |
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80 | /** Multiply by scalar. */ |
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81 | inline const Vec2f operator * (value_type rhs) const |
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82 | { |
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83 | return Vec2f(_v[0]*rhs, _v[1]*rhs); |
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84 | } |
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85 | |
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86 | /** Unary multiply by scalar. */ |
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87 | inline Vec2f& operator *= (value_type rhs) |
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88 | { |
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89 | _v[0]*=rhs; |
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90 | _v[1]*=rhs; |
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91 | return *this; |
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92 | } |
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93 | |
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94 | /** Divide by scalar. */ |
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95 | inline const Vec2f operator / (value_type rhs) const |
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96 | { |
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97 | return Vec2f(_v[0]/rhs, _v[1]/rhs); |
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98 | } |
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99 | |
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100 | /** Unary divide by scalar. */ |
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101 | inline Vec2f& operator /= (value_type rhs) |
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102 | { |
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103 | _v[0]/=rhs; |
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104 | _v[1]/=rhs; |
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105 | return *this; |
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106 | } |
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107 | |
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108 | /** Binary vector add. */ |
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109 | inline const Vec2f operator + (const Vec2f& rhs) const |
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110 | { |
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111 | return Vec2f(_v[0]+rhs._v[0], _v[1]+rhs._v[1]); |
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112 | } |
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113 | |
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114 | /** Unary vector add. Slightly more efficient because no temporary |
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115 | * intermediate object. |
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116 | */ |
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117 | inline Vec2f& operator += (const Vec2f& rhs) |
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118 | { |
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119 | _v[0] += rhs._v[0]; |
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120 | _v[1] += rhs._v[1]; |
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121 | return *this; |
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122 | } |
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123 | |
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124 | /** Binary vector subtract. */ |
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125 | inline const Vec2f operator - (const Vec2f& rhs) const |
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126 | { |
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127 | return Vec2f(_v[0]-rhs._v[0], _v[1]-rhs._v[1]); |
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128 | } |
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129 | |
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130 | /** Unary vector subtract. */ |
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131 | inline Vec2f& operator -= (const Vec2f& rhs) |
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132 | { |
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133 | _v[0]-=rhs._v[0]; |
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134 | _v[1]-=rhs._v[1]; |
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135 | return *this; |
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136 | } |
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137 | |
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138 | /** Negation operator. Returns the negative of the Vec2f. */ |
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139 | inline const Vec2f operator - () const |
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140 | { |
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141 | return Vec2f (-_v[0], -_v[1]); |
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142 | } |
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143 | |
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144 | /** Length of the vector = sqrt( vec . vec ) */ |
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145 | inline value_type length() const |
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146 | { |
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147 | return sqrtf( _v[0]*_v[0] + _v[1]*_v[1] ); |
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148 | } |
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149 | |
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150 | /** Length squared of the vector = vec . vec */ |
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151 | inline value_type length2( void ) const |
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152 | { |
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153 | return _v[0]*_v[0] + _v[1]*_v[1]; |
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154 | } |
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155 | |
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156 | /** Normalize the vector so that it has length unity. |
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157 | * Returns the previous length of the vector. |
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158 | */ |
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159 | inline value_type normalize() |
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160 | { |
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161 | value_type norm = Vec2f::length(); |
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162 | if (norm>0.0) |
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163 | { |
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164 | value_type inv = 1.0f/norm; |
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165 | _v[0] *= inv; |
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166 | _v[1] *= inv; |
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167 | } |
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168 | return( norm ); |
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169 | } |
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170 | |
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171 | }; // end of class Vec2f |
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172 | |
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173 | } // end of namespace osg |
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174 | #endif |
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175 | |
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