1 | /* -*- mode: c++; c-basic-offset: 4; indent-tabs-mode: nil -*- */ |
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2 | /* |
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3 | * @note : I refer to 'http://www.codeproject.com/useritems/ScoOterVisualizationPart2.asp' |
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4 | * @note : for this class |
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5 | */ |
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6 | |
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7 | #include <stdlib.h> |
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8 | #include <memory.h> |
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9 | |
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10 | #include <string> |
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11 | |
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12 | #include <graphics/VertexBuffer.h> |
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13 | |
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14 | #include "ContourLineFilter.h" |
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15 | |
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16 | using namespace nv; |
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17 | using namespace nv::graphics; |
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18 | using namespace vrmath; |
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19 | |
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20 | ContourLineFilter::ContourLineFilter() |
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21 | : _colorMap(0), _top(false) |
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22 | { |
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23 | } |
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24 | |
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25 | void |
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26 | ContourLineFilter::clear() |
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27 | { |
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28 | |
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29 | ContourLineFilter::ContourLineList::iterator iter; |
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30 | for (iter = _lines.begin(); iter != _lines.end(); ++iter) { |
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31 | delete (*iter); |
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32 | } |
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33 | _lines.clear(); |
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34 | } |
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35 | |
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36 | Geometry * |
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37 | ContourLineFilter::create(float min, float max, int linecount, |
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38 | Vector3f* vertices, int width, int height) |
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39 | { |
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40 | _lines.clear(); |
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41 | |
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42 | float transtion = (max - min) / (linecount + 1); |
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43 | float val; |
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44 | int totalPoints = 0, numPoints; |
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45 | for (int i = 1; i <= linecount; ++i) { |
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46 | val = min + i * transtion; |
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47 | |
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48 | ContourLine* c = new ContourLine(val); |
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49 | numPoints = c->createLine(width, height, vertices, _top); |
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50 | if (numPoints != 0) { |
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51 | totalPoints += numPoints; |
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52 | _lines.push_back(c); |
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53 | } else { |
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54 | delete c; |
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55 | } |
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56 | } |
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57 | Vector3f* vertexSet = (Vector3f *)malloc(sizeof(Vector3f) * totalPoints); |
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58 | Vector3f* colorSet = NULL; |
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59 | if (_colorMap) { |
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60 | colorSet = (Vector3f *)malloc(sizeof(Vector3f) * totalPoints); |
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61 | } |
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62 | ContourLineFilter::ContourLineList::iterator iter; |
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63 | unsigned int index = 0, colorIndex = 0; |
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64 | for (iter = _lines.begin(); iter != _lines.end(); ++iter, ++colorIndex) { |
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65 | std::list<Vector3f>& lines = (*iter)->_points; |
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66 | std::list<Vector3f>::iterator iter2; |
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67 | for (iter2 = lines.begin(); iter2 != lines.end(); ++iter2, ++index) { |
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68 | if (_colorMap && (colorIndex < _colorMap->size())) { |
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69 | colorSet[index] = _colorMap->at(colorIndex); |
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70 | } else { |
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71 | //colorSet[index].set((*iter)->_value, (*iter)->_value, (*iter)->_value); |
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72 | } |
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73 | vertexSet[index] = (*iter2); |
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74 | } |
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75 | } |
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76 | VertexBuffer *vertexBuffer = |
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77 | new VertexBuffer(VertexBuffer::POSITION3, totalPoints, |
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78 | totalPoints * sizeof(Vector3f), vertexSet, false); |
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79 | VertexBuffer *colorBuffer = NULL; |
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80 | if (_colorMap) { |
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81 | colorBuffer = |
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82 | new VertexBuffer(VertexBuffer::COLOR4, totalPoints, |
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83 | totalPoints * sizeof(Vector3f), colorSet, false); |
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84 | } |
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85 | Geometry *geometry = new Geometry(Geometry::LINES, vertexBuffer, colorBuffer, 0); |
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86 | clear(); |
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87 | return geometry; |
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88 | } |
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89 | |
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90 | Geometry * |
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91 | ContourLineFilter::create(float min, float max, int linecount, |
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92 | Vector4f* vertices, int width, int height) |
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93 | { |
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94 | _lines.clear(); |
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95 | |
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96 | float transtion = (max - min) / (linecount + 1); |
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97 | |
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98 | float val; |
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99 | int totalPoints = 0, numPoints; |
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100 | for (int i = 1; i <= linecount; ++i) { |
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101 | val = min + i * transtion; |
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102 | |
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103 | ContourLine* c = new ContourLine(val); |
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104 | numPoints = c->createLine(width, height, vertices, _top); |
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105 | if (numPoints != 0) { |
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106 | totalPoints += numPoints; |
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107 | _lines.push_back(c); |
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108 | } else { |
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109 | delete c; |
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110 | } |
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111 | } |
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112 | Vector3f* vertexSet = (Vector3f *)malloc(sizeof(Vector3f) * totalPoints); |
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113 | Vector3f* colorSet = (Vector3f *)malloc(sizeof(Vector3f) * totalPoints); |
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114 | |
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115 | ContourLineFilter::ContourLineList::iterator iter; |
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116 | unsigned int index = 0, colorIndex = 0; |
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117 | for (iter = _lines.begin(); iter != _lines.end(); ++iter, ++colorIndex) { |
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118 | std::list<Vector3f>& lines = (*iter)->_points; |
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119 | std::list<Vector3f>::iterator iter2; |
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120 | for (iter2 = lines.begin(); iter2 != lines.end(); ++iter2, ++index) { |
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121 | if (_colorMap && (colorIndex < _colorMap->size())) { |
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122 | colorSet[index] = _colorMap->at(colorIndex); |
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123 | } else { |
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124 | colorSet[index].set((*iter)->_value, (*iter)->_value, |
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125 | (*iter)->_value); |
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126 | } |
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127 | vertexSet[index] = (*iter2); |
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128 | } |
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129 | } |
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130 | VertexBuffer *vertexBuffer = |
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131 | new VertexBuffer(VertexBuffer::POSITION3, totalPoints, |
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132 | totalPoints * sizeof(Vector3f), vertexSet, false); |
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133 | VertexBuffer *colorBuffer = |
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134 | new VertexBuffer(VertexBuffer::COLOR4, totalPoints, |
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135 | totalPoints * sizeof(Vector3f), colorSet, false); |
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136 | Geometry *geometry = |
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137 | new Geometry(Geometry::LINES, vertexBuffer, colorBuffer, 0); |
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138 | clear(); |
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139 | return geometry; |
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140 | } |
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141 | |
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142 | |
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143 | ContourLineFilter::ContourLine::ContourLine(float value) |
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144 | : _value(value) |
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145 | { |
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146 | } |
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147 | |
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148 | |
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149 | int |
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150 | ContourLineFilter::ContourLine::createLine(int width, int height, |
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151 | Vector3f* vertices, bool top) |
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152 | { |
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153 | _points.clear(); |
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154 | |
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155 | int hl = height - 1; |
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156 | int wl = width - 1; |
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157 | int index1, index2, index3, index4; |
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158 | for (int i = 0; i < hl; ++i) { |
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159 | for (int j = 0; j < wl; ++j) { |
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160 | index1 = j + i * width; |
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161 | index2 = j + 1 + i * width; |
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162 | index3 = j + 1 + (i + 1) * width; |
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163 | index4 = j + (i + 1) * width; |
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164 | |
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165 | if (isValueWithIn(vertices[index1].y, vertices[index2].y)) |
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166 | getContourPoint(index1, index2, vertices, width, top); |
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167 | if (isValueWithIn(vertices[index2].y, vertices[index3].y)) |
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168 | getContourPoint(index2, index3, vertices, width, top); |
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169 | if (isValueWithIn(vertices[index3].y, vertices[index1].y)) |
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170 | getContourPoint(index3, index1, vertices, width, top); |
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171 | |
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172 | if (isValueWithIn(vertices[index1].y, vertices[index3].y)) |
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173 | getContourPoint(index1, index3, vertices, width, top); |
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174 | if (isValueWithIn(vertices[index3].y, vertices[index4].y)) |
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175 | getContourPoint(index3, index4, vertices, width, top); |
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176 | if (isValueWithIn(vertices[index4].y, vertices[index1].y)) |
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177 | getContourPoint(index4, index1, vertices, width, top); |
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178 | } |
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179 | } |
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180 | return _points.size(); |
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181 | } |
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182 | |
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183 | |
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184 | int |
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185 | ContourLineFilter::ContourLine::createLine(int width, int height, |
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186 | Vector4f* vertices, bool top) |
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187 | { |
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188 | _points.clear(); |
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189 | |
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190 | int hl = height - 1; |
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191 | int wl = width - 1; |
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192 | int index1, index2, index3, index4; |
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193 | for (int i = 0; i < hl; ++i) { |
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194 | for (int j = 0; j < wl; ++j) { |
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195 | index1 = j + i * width; |
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196 | index2 = j + 1 + i * width; |
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197 | index3 = j + 1 + (i + 1) * width; |
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198 | index4 = j + (i + 1) * width; |
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199 | |
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200 | if (isValueWithIn(vertices[index1].y, vertices[index2].y)) |
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201 | getContourPoint(index1, index2, vertices, width, top); |
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202 | if (isValueWithIn(vertices[index2].y, vertices[index3].y)) |
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203 | getContourPoint(index2, index3, vertices, width, top); |
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204 | if (isValueWithIn(vertices[index3].y, vertices[index1].y)) |
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205 | getContourPoint(index3, index1, vertices, width, top); |
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206 | |
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207 | if (isValueWithIn(vertices[index1].y, vertices[index3].y)) |
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208 | getContourPoint(index1, index3, vertices, width, top); |
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209 | if (isValueWithIn(vertices[index3].y, vertices[index4].y)) |
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210 | getContourPoint(index3, index4, vertices, width, top); |
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211 | if (isValueWithIn(vertices[index4].y, vertices[index1].y)) |
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212 | getContourPoint(index4, index1, vertices, width, top); |
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213 | } |
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214 | } |
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215 | |
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216 | return _points.size(); |
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217 | } |
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218 | |
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219 | |
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220 | void |
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221 | ContourLineFilter::ContourLine::getContourPoint(int vertexIndex1, |
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222 | int vertexIndex2, Vector3f* vertices, int width, bool top) |
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223 | { |
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224 | float diff = vertices[vertexIndex2].y - vertices[vertexIndex1].y; |
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225 | float t = 0.0; |
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226 | if (diff != 0) { |
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227 | t = (_value - vertices[vertexIndex1].y) / diff; |
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228 | } |
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229 | |
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230 | Vector3f p; |
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231 | p.x = vertices[vertexIndex1].x + t * |
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232 | (vertices[vertexIndex2].x - vertices[vertexIndex1].x); |
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233 | |
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234 | if (top) |
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235 | { |
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236 | p.y = 1.0f; |
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237 | } |
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238 | else |
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239 | { |
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240 | p.y = vertices[vertexIndex1].y + t * |
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241 | (vertices[vertexIndex2].y - vertices[vertexIndex1].y); |
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242 | } |
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243 | |
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244 | p.z = vertices[vertexIndex1].z + t * |
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245 | (vertices[vertexIndex2].z - vertices[vertexIndex1].z); |
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246 | _points.push_back(p); |
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247 | } |
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248 | |
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249 | void |
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250 | ContourLineFilter::ContourLine::getContourPoint(int vertexIndex1, |
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251 | int vertexIndex2, Vector4f* vertices, int width, bool top) |
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252 | { |
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253 | float diff = vertices[vertexIndex2].y - vertices[vertexIndex1].y; |
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254 | float t = 0.0; |
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255 | if (diff != 0) { |
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256 | t = (_value - vertices[vertexIndex1].y) / diff; |
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257 | } |
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258 | |
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259 | Vector3f p; |
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260 | p.x = vertices[vertexIndex1].x + |
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261 | t * (vertices[vertexIndex2].x - vertices[vertexIndex1].x); |
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262 | if (top) |
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263 | { |
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264 | p.y = 1.0f; |
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265 | } |
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266 | else |
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267 | { |
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268 | p.y = vertices[vertexIndex1].y + |
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269 | t * (vertices[vertexIndex2].y - vertices[vertexIndex1].y); |
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270 | } |
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271 | |
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272 | p.z = vertices[vertexIndex1].z + |
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273 | t * (vertices[vertexIndex2].z - vertices[vertexIndex1].z); |
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274 | _points.push_back(p); |
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275 | } |
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276 | |
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277 | |
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278 | void |
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279 | ContourLineFilter::setColorMap(Vector3fArray* colorMap) |
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280 | { |
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281 | if (colorMap == _colorMap) { |
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282 | return; |
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283 | } |
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284 | if (colorMap && _colorMap) { |
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285 | if (colorMap->size() != _colorMap->size()) { |
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286 | _colorMap->resize(_colorMap->size()); |
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287 | } |
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288 | _colorMap->assign(colorMap->begin(), colorMap->end()); |
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289 | } else { |
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290 | delete _colorMap; |
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291 | |
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292 | if (colorMap && colorMap->size()) { |
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293 | _colorMap = new Vector3fArray(colorMap->size()); |
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294 | _colorMap->assign(colorMap->begin(), colorMap->end()); |
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295 | } else { |
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296 | _colorMap = 0; |
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297 | } |
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298 | } |
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299 | } |
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