1 | /************************************************************** ggt-head beg |
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2 | * |
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3 | * GGT: Generic Graphics Toolkit |
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4 | * |
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5 | * Original Authors: |
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6 | * Allen Bierbaum |
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7 | * |
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8 | * ----------------------------------------------------------------- |
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9 | * File: TriOps.h,v |
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10 | * Date modified: 2004/09/16 21:21:10 |
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11 | * Version: 1.9 |
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12 | * ----------------------------------------------------------------- |
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13 | * |
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14 | *********************************************************** ggt-head end */ |
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15 | /*************************************************************** ggt-cpr beg |
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16 | * |
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17 | * GGT: The Generic Graphics Toolkit |
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18 | * Copyright (C) 2001,2002 Allen Bierbaum |
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19 | * |
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20 | * This library is free software; you can redistribute it and/or |
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21 | * modify it under the terms of the GNU Lesser General Public |
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22 | * License as published by the Free Software Foundation; either |
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23 | * version 2.1 of the License, or (at your option) any later version. |
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24 | * |
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25 | * This library is distributed in the hope that it will be useful, |
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26 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
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27 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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28 | * Lesser General Public License for more details. |
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29 | * |
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30 | * You should have received a copy of the GNU Lesser General Public |
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31 | * License along with this library; if not, write to the Free Software |
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32 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
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33 | * |
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34 | ************************************************************ ggt-cpr end */ |
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35 | #ifndef _GMTL_TRIOPS_H_ |
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36 | #define _GMTL_TRIOPS_H_ |
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37 | |
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38 | #include <gmtl/Tri.h> |
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39 | #include <gmtl/Generate.h> |
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40 | #include <gmtl/VecOps.h> |
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41 | |
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42 | namespace gmtl |
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43 | { |
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44 | /** @ingroup Ops Tri |
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45 | * @name Triangle Operations |
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46 | * @{ |
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47 | */ |
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48 | |
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49 | /** |
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50 | * Computes the point at the center of the given triangle. |
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51 | * |
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52 | * @param tri the triangle to find the center of |
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53 | * |
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54 | * @return the point at the center of the triangle |
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55 | */ |
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56 | template< class DATA_TYPE > |
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57 | Point<DATA_TYPE, 3> center( const Tri<DATA_TYPE>& tri ) |
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58 | { |
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59 | const float one_third = (1.0f/3.0f); |
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60 | return (tri[0] + tri[1] + tri[2]) * DATA_TYPE(one_third); |
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61 | } |
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62 | |
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63 | /** |
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64 | * Computes the normal for this triangle. |
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65 | * |
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66 | * @param tri the triangle for which to compute the normal |
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67 | * |
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68 | * @return the normal vector for tri |
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69 | */ |
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70 | template< class DATA_TYPE > |
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71 | Vec<DATA_TYPE, 3> normal( const Tri<DATA_TYPE>& tri ) |
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72 | { |
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73 | Vec<DATA_TYPE, 3> normal = makeCross( gmtl::Vec<DATA_TYPE,3>(tri[1] - tri[0]), gmtl::Vec<DATA_TYPE,3>(tri[2] - tri[0]) ); |
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74 | normalize( normal ); |
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75 | return normal; |
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76 | } |
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77 | /** @} */ |
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78 | |
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79 | /** @ingroup Compare Tri |
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80 | * @name Triangle Comparitors |
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81 | * @{ |
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82 | */ |
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83 | |
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84 | /** |
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85 | * Compare two triangles to see if they are EXACTLY the same. |
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86 | * |
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87 | * @param tri1 the first triangle to compare |
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88 | * @param tri2 the second triangle to compare |
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89 | * |
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90 | * @return true if they are equal, false otherwise |
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91 | */ |
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92 | template< class DATA_TYPE > |
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93 | bool operator==( const Tri<DATA_TYPE>& tri1, const Tri<DATA_TYPE>& tri2 ) |
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94 | { |
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95 | return ( (tri1[0] == tri2[0]) && |
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96 | (tri1[1] == tri2[1]) && |
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97 | (tri1[2] == tri2[2]) ); |
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98 | } |
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99 | |
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100 | /** |
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101 | * Compare two triangle to see if they are not EXACTLY the same. |
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102 | * |
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103 | * @param tri1 the first triangle to compare |
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104 | * @param tri2 the second triangle to compare |
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105 | * |
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106 | * @return true if they are not equal, false otherwise |
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107 | */ |
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108 | template< class DATA_TYPE > |
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109 | bool operator!=( const Tri<DATA_TYPE>& tri1, const Tri<DATA_TYPE>& tri2 ) |
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110 | { |
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111 | return (! (tri1 == tri2)); |
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112 | } |
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113 | |
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114 | /** |
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115 | * Compare two triangles to see if they are the same within the given tolerance. |
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116 | * |
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117 | * @param tri1 the first triangle to compare |
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118 | * @param tri2 the second triangle to compare |
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119 | * @param eps the tolerance value to use |
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120 | * |
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121 | * @pre eps must be >= 0 |
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122 | * |
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123 | * @return true if they are equal within the tolerance, false otherwise |
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124 | */ |
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125 | template< class DATA_TYPE > |
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126 | bool isEqual( const Tri<DATA_TYPE>& tri1, const Tri<DATA_TYPE>& tri2, |
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127 | const DATA_TYPE& eps ) |
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128 | { |
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129 | gmtlASSERT( eps >= 0 ); |
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130 | return ( isEqual(tri1[0], tri2[0], eps) && |
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131 | isEqual(tri1[1], tri2[1], eps) && |
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132 | isEqual(tri1[2], tri2[2], eps) ); |
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133 | } |
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134 | /** @} */ |
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135 | |
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136 | } // namespace gmtl |
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137 | |
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138 | #endif |
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139 | |
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