src/invert.cpp

Sat, 05 Mar 2022 13:18:40 +0200

author
Teemu Piippo <teemu@hecknology.net>
date
Sat, 05 Mar 2022 13:18:40 +0200
changeset 161
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parent 33
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child 183
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permissions
-rw-r--r--

Icons update

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1 /*
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2 * LDForge: LDraw parts authoring CAD
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3 * Copyright (C) 2013 - 2020 Teemu Piippo
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4 *
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5 * This program is free software: you can redistribute it and/or modify
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6 * it under the terms of the GNU General Public License as published by
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7 * the Free Software Foundation, either version 3 of the License, or
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8 * (at your option) any later version.
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9 *
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10 * This program is distributed in the hope that it will be useful,
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11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
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12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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13 * GNU General Public License for more details.
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14 *
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15 * You should have received a copy of the GNU General Public License
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16 * along with this program. If not, see <http://www.gnu.org/licenses/>.
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17 */
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18
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19 #include "main.h"
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20 #include "model.h"
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21 #include "gl/common.h"
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22 #include "invert.h"
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23
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24 #if 0
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25 /*
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26 * Returns whether or not the document is flat.
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27 * If it is flat, the result is stored in *axis.
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28 */
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29 bool isflat(Model* model, Axis* flatDimension)
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30 {
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31 // The dimensions that this model is potentially flat in.
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32 QVector<Axis> dimensions = {X, Y, Z};
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33
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34 // Iterate through everything in the subfile. If there is any vertex with a coordinate not at
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35 // zero, the subfile is not flat in that dimension.
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36 for (LDObject* subfileObject : model->objects())
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37 {
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38 for (int i = 0; i < subfileObject->numVertices(); ++i)
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39 {
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40 Vertex const& v_i = subfileObject->vertex(i);
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41
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42 if (not qFuzzyCompare(v_i.x, 0.0))
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43 dimensions.removeOne(X);
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44
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45 if (not qFuzzyCompare(v_i.y, 0.0))
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46 dimensions.removeOne(Y);
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47
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48 if (not qFuzzyCompare(v_i.z, 0.0))
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49 dimensions.removeOne(Z);
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50 }
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51
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52 // If there are no more dimensions left, we can exit the loop.
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53 if (dimensions.isEmpty())
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54 break;
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55 }
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56
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57 if (dimensions.size() == 1)
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58 {
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59 // The model is flat in one dimension, return that.
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60 // If the model is flat in two or three dimensions, it's not really a valid model.
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61 *flatDimension = dimensions[0];
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62 return true;
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63 }
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64 else
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65 {
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66 // The model is not flat.
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67 return false;
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68 }
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69 }
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70 #endif
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71
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72 /*
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73 * Returns a matrix that causes a flip on the given dimension.
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74 */
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75 glm::mat4 math::flipmatrix(const Axis dimension)
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76 {
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77 glm::mat4 result = glm::mat4();
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78 const int k = static_cast<int>(dimension);
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79 result[k][k] = -1;
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80 return result;
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81 }
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82
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83 #if 0
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84 /*
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85 * Inverts an LDObject so that its winding is changed.
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86 */
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87 void invert(LDObject* obj, DocumentManager* context)
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88 {
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89 if (obj->numPolygonVertices() > 0)
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90 {
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91 // Object is vertex based, so change the order of the vertices.
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92 QVector<Vertex> vertices;
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93 vertices.resize(obj->numPolygonVertices());
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94
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95 for (int i = 0; i < vertices.size(); i += 1)
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96 vertices[vertices.size() - 1 - i] = obj->vertex(i);
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97
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98 for (int i = 0; i < vertices.size(); i += 1)
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99 obj->setVertex(i, vertices[i]);
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100 }
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101 else if (obj->type() == LDObjectType::SubfileReference)
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102 {
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103 // Check whether subfile is flat. If it is, flip it on the axis on which it is flat.
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104 Model model {context};
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105 LDSubfileReference* reference = static_cast<LDSubfileReference*>(obj);
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106 reference->fileInfo(context)->inlineContents(model, true, false);
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107 Axis flatDimension;
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108
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109 if (::isflat(&model, &flatDimension))
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110 {
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111 reference->setTransformationMatrix(
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112 reference->transformationMatrix() * ::flipmatrix(flatDimension)
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113 );
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114 }
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115 else
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116 {
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117 // Subfile is not flat. Resort to invertnext.
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118 reference->setInverted(not reference->isInverted());
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119 }
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120 }
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121 else if (obj->type() == LDObjectType::CircularPrimitive)
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122 {
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123 auto primitive = static_cast<LDCircularPrimitive*>(obj);
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124
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125 if (primitive->isFlat())
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126 primitive->setTransformationMatrix(primitive->transformationMatrix() * ::flipmatrix(Y));
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127 else
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128 primitive->setInverted(not primitive->isInverted());
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129 }
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130 }
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131 #endif
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132
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133 /*
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134 * Inverts the winding of a polygon.
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135 */
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136 void gl::invert(gl::Polygon& polygon)
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137 {
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138 switch (polygon.numPolygonVertices())
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139 {
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140 case 2:
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141 case 3:
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142 // 0 1 => 1 0
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143 // 0 1 2 => 1 0 2
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144 std::swap(polygon.vertices[0], polygon.vertices[1]);
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145 break;
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146 case 4:
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147 // 0 1 2 3 => 0 3 2 1
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148 std::swap(polygon.vertices[1], polygon.vertices[3]);
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149 break;
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150 }
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151 }

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