Mercurial > hg > orthanc-stone

annotate Framework/Toolbox/DicomStructure2.h @ 998:38b6bb0bdd72

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added a new set of classes that correctly handle non-convex polygons (not used yet because of limitations in coordinates computing): DicomStructure2, DicomStructureSet2, DicomStructurePolygon2, DicomStructureSetSlicer2. Too many shortcuts have been taken when computing the actual position.
author Benjamin Golinvaux <bgo@osimis.io>
date Fri, 20 Sep 2019 11:58:00 +0200
parents
children 29f5f2031310
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998
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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) 2017-2019 Osimis S.A., Belgium
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6 *
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7 * This program is free software: you can redistribute it and/or
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8 * modify it under the terms of the GNU Affero General Public License
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9 * as published by the Free Software Foundation, either version 3 of
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10 * the License, or (at your option) any later version.
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11 *
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12 * This program is distributed in the hope that it will be useful, but
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13 * WITHOUT ANY WARRANTY; without even the implied warranty of
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14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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15 * Affero General Public License for more details.
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16 *
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17 * You should have received a copy of the GNU Affero General Public License
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18 * along with this program. If not, see <http://www.gnu.org/licenses/>.
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19 **/
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20
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21 #pragma once
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22
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23 #include "DicomStructurePolygon2.h"
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24 #include "DicomStructureSetUtils.h"
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25
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26 namespace OrthancStone
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27 {
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28
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29 /*
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30 A structure has a color, a name, a set of slices..
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31
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32 Each slice is a polygon.
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33 */
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34 struct DicomStructure2
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35 {
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36 DicomStructure2() :
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37 red_(0), green_(0), blue_(0), sliceThickness_(0), state_(Building) {}
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38
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39 void AddPolygon(const DicomStructurePolygon2& polygon);
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40
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41 /**
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42 Once all polygons have been added, this method will determine:
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43 - the slice orientation (through the normal vector)
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44 - the spacing between slices (slice thickness)
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45
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46 it will also set up the info required to efficiently compute plane
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47 intersections later on.
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48 */
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49 void ComputeDependentProperties();
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50
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51 /**
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52 Being given a plane that is PARALLEL to the set of polygon contours, this
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53 returns a pointer to the polygon located at that position (if it is closer
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54 than thickness/2) or NULL if there is none.
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55
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56 TODO: use sorted vector to improve
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57
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58 DO NOT STORE THE RETURNED POINTER!
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59 */
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60 const DicomStructurePolygon2* GetPolygonClosestToSlice(const CoordinateSystem3D& plane) const;
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61
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62 Vector GetNormal() const;
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63
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64 Color GetColor() const
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65 {
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66 return Color(red_, green_, blue_);
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67 }
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68
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69 bool IsValid() const
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70 {
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71 return state_ == Valid;
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72 }
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73
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74 /**
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75 This method is used to project the 3D structure on a 2D plane.
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76
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77 A structure is a stack of polygons, representing a volume.
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78
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79 We need to compute the intersection between this volume and the supplied
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80 cutting plane (the "slice"). This is more than a cutting plane: it is also
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81 a 2D-coordinate system (the plane has axes vectors)
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82
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83 The cutting plane is always parallel to the plane defined by two of the
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84 world coordinate system axes.
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85
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86 The result is a set of closed polygons.
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87
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88 If the cut is parallel to the polygons, we pick the polygon closest to
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89 the slice, project it on the slice and return it in slice coordinates.
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90
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91 If the cut is perpendicular to the polygons, for each polygon, we compute
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92 the intersection between the cutting plane and the polygon slab (imaginary
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93 volume created by extruding the polygon above and below its plane by
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94 thickness/2) :
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95 - each slab, intersected by the plane, gives a set of 0..* rectangles \
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96 (only one if the polygon is convex)
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97 - when doing this for the whole stack of slabs, we get a set of rectangles:
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98 To compute these rectangles, for each polygon, we compute the intersection
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99 between :
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100 - the line defined by the intersection of the polygon plane and the cutting
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101 plane
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102 - the polygon itself
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103 This yields 0 or 2*K points along the line C. These are turned into K
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104 rectangles by taking two consecutive points along the line and extruding
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105 this segment by sliceThickness/2 in the orientation of the polygon normal,
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106 in both directions.
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107
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108 Then, once this list of rectangles is computed, we need to group the
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109 connected rectangles together. Connected, here, means sharing at least part
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110 of an edge --> union/find data structures and algorithm.
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111 */
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112 bool Project(std::vector< std::pair<Point2D, Point2D> >& polygons, const CoordinateSystem3D& plane) const;
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113
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114 std::string interpretation_;
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115 std::string name_;
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116 uint8_t red_;
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117 uint8_t green_;
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118 uint8_t blue_;
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119
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120 /** Internal */
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121 const std::vector<DicomStructurePolygon2>& GetPolygons() const
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122 {
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123 return polygons_;
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124 }
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125
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126 /** Internal */
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127 double GetSliceThickness() const
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128 {
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129 return sliceThickness_;
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130 }
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131
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132 private:
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133 enum State
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134 {
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135 Building,
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136 NormalComputed,
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137 Valid, // When normal components AND slice thickness are computed
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138 Invalid
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139 };
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140
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141 void ComputeNormal();
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142 void ComputeSliceThickness();
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143
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144 std::vector<DicomStructurePolygon2> polygons_;
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145 Vector3D normal_;
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146 double sliceThickness_;
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147
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148 /*
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149 After creation (and while polygons are added), state is Building.
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150 After ComputeDependentProperties() is called, state can either be
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151 Valid or Invalid. In any case, the object becomes immutable.
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152 */
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153 State state_;
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154 };
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155 }