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annotate OrthancStone/Sources/Toolbox/DicomStructure2.h @ 1870:3889ae96d2e9

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added copyright UCLouvain
author Sebastien Jodogne <s.jodogne@gmail.com>
date Tue, 11 Jan 2022 11:04:09 +0100
parents 9ac2a65d4172
children 7053b8a0aaec
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1 /**
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2 * Stone of Orthanc
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3 * Copyright (C) 2012-2016 Sebastien Jodogne, Medical Physics
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4 * Department, University Hospital of Liege, Belgium
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5 * Copyright (C) 2017-2021 Osimis S.A., Belgium
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6 * Copyright (C) 2021-2021 Sebastien Jodogne, ICTEAM UCLouvain, Belgium
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7 *
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8 * This program is free software: you can redistribute it and/or
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9 * modify it under the terms of the GNU Lesser General Public License
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10 * as published by the Free Software Foundation, either version 3 of
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11 * the License, or (at your option) any later version.
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12 *
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13 * This program is distributed in the hope that it will be useful, but
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14 * WITHOUT ANY WARRANTY; without even the implied warranty of
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15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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16 * Lesser General Public License for more details.
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17 *
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18 * You should have received a copy of the GNU Lesser General Public
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19 * License along with this program. If not, see
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20 * <http://www.gnu.org/licenses/>.
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21 **/
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22
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23 #pragma once
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24
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25 #ifdef BGO_ENABLE_DICOMSTRUCTURESETLOADER2
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26
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27 #include "DicomStructurePolygon2.h"
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28 #include "DicomStructureSetUtils.h"
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29
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30 namespace OrthancStone
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31 {
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32
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33 /*
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34 A structure has a color, a name, a set of slices..
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35
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36 Each slice is a polygon.
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37 */
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38 struct DicomStructure2
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39 {
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40 DicomStructure2() :
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41 red_(0), green_(0), blue_(0), sliceThickness_(0), state_(Building) {}
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42
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43 void AddPolygon(const DicomStructurePolygon2& polygon);
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44
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45 /**
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46 Once all polygons have been added, this method will determine:
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47 - the slice orientation (through the normal vector)
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48 - the spacing between slices (slice thickness)
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49
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50 it will also set up the info required to efficiently compute plane
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51 intersections later on.
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52 */
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53 void ComputeDependentProperties();
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54
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55 /**
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56 Being given a plane that is PARALLEL to the set of polygon structures, this
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57 returns a pointer to the polygon located at that position (if it is closer
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58 than thickness/2) or NULL if there is none.
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59
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60 TODO: use sorted vector to improve
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61
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62 DO NOT STORE THE RETURNED POINTER!
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63 */
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64 const DicomStructurePolygon2* GetPolygonClosestToSlice(const CoordinateSystem3D& plane) const;
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65
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66 Vector GetNormal() const;
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67
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68 Color GetColor() const
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69 {
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70 return Color(red_, green_, blue_);
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71 }
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72
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73 bool IsValid() const
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74 {
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75 return state_ == Valid;
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76 }
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77
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78 /**
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79 This method is used to project the 3D structure on a 2D plane.
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80
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81 A structure is a stack of polygons, representing a volume.
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82
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83 We need to compute the intersection between this volume and the supplied
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84 cutting plane (the "slice"). This is more than a cutting plane: it is also
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85 a 2D-coordinate system (the plane has axes vectors)
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86
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87 The cutting plane is always parallel to the plane defined by two of the
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88 world coordinate system axes.
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89
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90 The result is a set of closed polygons.
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91
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92 If the cut is parallel to the polygons, we pick the polygon closest to
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93 the slice, project it on the slice and return it in slice coordinates.
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94
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95 If the cut is perpendicular to the polygons, for each polygon, we compute
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96 the intersection between the cutting plane and the polygon slab (imaginary
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97 volume created by extruding the polygon above and below its plane by
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98 thickness/2) :
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99 - each slab, intersected by the plane, gives a set of 0..* rectangles \
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100 (only one if the polygon is convex)
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101 - when doing this for the whole stack of slabs, we get a set of rectangles:
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102 To compute these rectangles, for each polygon, we compute the intersection
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103 between :
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104 - the line defined by the intersection of the polygon plane and the cutting
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105 plane
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106 - the polygon itself
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107 This yields 0 or 2*K points along the line C. These are turned into K
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108 rectangles by taking two consecutive points along the line and extruding
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109 this segment by sliceThickness/2 in the orientation of the polygon normal,
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110 in both directions.
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111
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112 Then, once this list of rectangles is computed, we need to group the
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113 connected rectangles together. Connected, here, means sharing at least part
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114 of an edge --> union/find data structures and algorithm.
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115 */
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116 bool Project(std::vector< std::pair<Point2D, Point2D> >& polygons, const CoordinateSystem3D& plane) const;
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117
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118 std::string interpretation_;
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119 std::string name_;
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120 uint8_t red_;
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121 uint8_t green_;
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122 uint8_t blue_;
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123
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124 /** Internal */
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125 const std::vector<DicomStructurePolygon2>& GetPolygons() const
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126 {
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127 return polygons_;
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128 }
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129
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130 /** Internal */
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131 double GetSliceThickness() const
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132 {
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133 return sliceThickness_;
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134 }
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135
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136 private:
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137 enum State
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138 {
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139 Building,
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140 NormalComputed,
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141 Valid, // When normal components AND slice thickness are computed
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142 Invalid
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143 };
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144
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145 void ComputeNormal();
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146 void ComputeSliceThickness();
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147
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148 std::vector<DicomStructurePolygon2> polygons_;
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149 Vector3D normal_;
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150 double sliceThickness_;
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151
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152 /*
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153 After creation (and while polygons are added), state is Building.
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154 After ComputeDependentProperties() is called, state can either be
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155 Valid or Invalid. In any case, the object becomes immutable.
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156 */
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157 State state_;
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158 };
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159 }
1019
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160
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161 #endif
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162 // BGO_ENABLE_DICOMSTRUCTURESETLOADER2
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163