Mercurial > hg > orthanc-stone

annotate Framework/Toolbox/DicomStructurePolygon2.cpp @ 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 58eed6bbcabb
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rev   line source
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 #include "DicomStructurePolygon2.h"
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22
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23 #include "../Toolbox/LinearAlgebra.h"
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24
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25 namespace OrthancStone
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26 {
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27 void DicomStructurePolygon2::ComputeDependentProperties()
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28 {
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29 ORTHANC_ASSERT(state_ == Building);
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30
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31 for (size_t j = 0; j < points_.size(); ++j)
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32 {
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33 // TODO: move to AddPoint!
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34 const Point3D& p = points_[j];
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35 if (p[0] < minX_)
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36 minX_ = p[0];
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37 if (p[0] > maxX_)
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38 maxX_ = p[0];
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39
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40 if (p[1] < minY_)
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41 minY_ = p[1];
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42 if (p[1] > maxY_)
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43 maxY_ = p[1];
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44
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45 if (p[2] < minZ_)
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46 minZ_ = p[2];
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47 if (p[2] > maxZ_)
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48 maxZ_ = p[2];
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49 }
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50
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51 if (LinearAlgebra::IsNear(minX_, maxX_))
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52 {
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53 LinearAlgebra::AssignVector(normal_, 1, 0, 0);
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54 //ORTHANC_ASSERT(!LinearAlgebra::IsNear(minX, maxX));
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55 ORTHANC_ASSERT(!LinearAlgebra::IsNear(minY_, maxY_));
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56 ORTHANC_ASSERT(!LinearAlgebra::IsNear(minZ_, maxZ_));
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57 }
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58 else if (LinearAlgebra::IsNear(minY_, maxY_))
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59 {
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60 LinearAlgebra::AssignVector(normal_, 0, 1, 0);
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61 ORTHANC_ASSERT(!LinearAlgebra::IsNear(minX_, maxX_));
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62 ORTHANC_ASSERT(!LinearAlgebra::IsNear(minZ_, maxZ_));
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63 }
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64 else if (LinearAlgebra::IsNear(minZ_, maxZ_))
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65 {
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66 LinearAlgebra::AssignVector(normal_, 0, 0, 1);
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67 ORTHANC_ASSERT(!LinearAlgebra::IsNear(minX_, maxX_));
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68 ORTHANC_ASSERT(!LinearAlgebra::IsNear(minY_, maxY_));
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69 }
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70 else
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71 {
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72 LOG(ERROR) << "The contour is not coplanar and not parallel to any axis.";
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73 throw Orthanc::OrthancException(Orthanc::ErrorCode_ParameterOutOfRange);
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74 }
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75 state_ = Valid;
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76 }
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77
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78
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79 void DicomStructurePolygon2::ProjectOnConstantPlane(
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80 std::vector<Point2D>& intersections, const CoordinateSystem3D& plane) const
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81 {
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82 // the plane can either have constant X, or constant Y.
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83 // - for constant Z planes, use the ProjectOnParallelPlane method
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84 // - other type of planes are not supported
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85
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86 // V is the coordinate that is constant in the plane
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87 double planeV = 0.0;
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88
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89 // if true, then "u" in the code is "x" and "v" is "y".
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90 // (v is constant in the plane)
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91 bool uvxy = false;
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92 // if true, then "u" in the code is "y" and "v" is "x"
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93 // (v is constant in the plane)
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94 bool uvyx = false;
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95
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96 size_t uindex = static_cast<size_t>(-1);
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97 size_t vindex = static_cast<size_t>(-1);
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98
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99 ORTHANC_ASSERT(LinearAlgebra::IsNear(plane.GetNormal()[2], 0.0));
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100
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101 if (LinearAlgebra::IsNear(plane.GetNormal()[1], 0.0))
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102 {
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103 // normal is 1,0,0 (or -1,0,0).
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104 // plane is constant X
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105 uindex = 1;
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106 vindex = 0;
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107
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108 uvxy = false;
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109 uvyx = true;
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110 planeV = plane.GetOrigin()[0];
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111 if (planeV < minX_)
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112 return;
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113 if (planeV > maxX_)
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114 return;
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115 }
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116 else if (LinearAlgebra::IsNear(plane.GetNormal()[0], 0.0))
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117 {
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118 // normal is 0,1,0 (or 0,-1,0).
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119 // plane is constant Y
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120 uindex = 0;
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121 vindex = 1;
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122
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123 uvxy = true;
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124 uvyx = false;
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125 planeV = plane.GetOrigin()[1];
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126 if (planeV < minY_)
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127 return;
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128 if (planeV > maxY_)
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129 return;
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130 }
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131 else
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132 {
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133 // if the following assertion(s) fail(s), it means the plane is NOT a constant-X or constant-Y plane
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134 LOG(ERROR) << "Plane normal must be (a,0,0) or (0,a,0), with a == -1 or a == 1";
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135 throw Orthanc::OrthancException(Orthanc::ErrorCode_ParameterOutOfRange);
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136 }
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137
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138 size_t pointCount = GetPointCount();
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139 if (pointCount >= 3)
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140 {
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141 // this vector will contain the coordinates of the intersection points
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142 // between the plane and the polygon.
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143 // these are expressed in the U coordinate, that is either X or Y,
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144 // depending upon the plane orientation
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145 std::vector<double> uIntersections;
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146
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147 // we loop on the segments of the polygon (TODO: optimize)
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148 // and we compute the intersection between each segment and the cut
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149 // cutting plane (slice) has a constant X
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150
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151 for (size_t iPoint = 0; iPoint < pointCount; ++iPoint)
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152 {
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153 double u1 = points_[iPoint][uindex];
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154 double v1 = points_[iPoint][vindex];
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155
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156 double u2 = 0;
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157 double v2 = 0;
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158
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159 if (iPoint < pointCount - 1)
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160 {
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161 u2 = points_[iPoint + 1][uindex];
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162 v2 = points_[iPoint + 1][vindex];
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163 }
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164 else
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165 {
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166 u2 = points_[0][uindex];
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167 v2 = points_[0][vindex];
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168 }
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169
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170 // Check if the segment intersects the plane
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171 if ((std::min(v1, v2) <= planeV) && (std::max(v1, v2) >= planeV))
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172 {
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173 // special case: the segment is parallel to the plane but close to it
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174 if (LinearAlgebra::IsNear(v1, v2))
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175 {
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176 // in that case, we choose to label both points as an intersection
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177 double x, y;
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178 plane.ProjectPoint(x, y, points_[iPoint]);
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179 intersections.push_back(Point2D(x, y));
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180
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181 plane.ProjectPoint(x, y, points_[iPoint + 1]);
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182 intersections.push_back(Point2D(x, y));
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183 }
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184 else
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185 {
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186 // we are looking for u so that (u,planeV) belongs to the segment
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187 // let's define alpha = (u-u2)/(u1-u2) --> u = alpha*(u1-u2) + u2
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188 // alpha = (v2-planeV)/(v2-v1)
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189 // because the following two triangles are similar
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190 // [ (planeY,x) , (y2,x2), (planeY,x2) ] or
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191 // [ (planeX,y) , (x2,y2), (planeX,y2) ]
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192 // and
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193 // [ (y1 ,x1) , (y2,x2), (y1 ,x2) ] or
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194 // [ (x1 ,y1) , (x2,y2), (x1 ,y2) ]
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195
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196 /*
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197 void CoordinateSystem3D::ProjectPoint(double& offsetX,
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198 double& offsetY,
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199 const Vector& point) const
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200 */
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201 double alpha = (v2 - planeV) / (v2 - v1);
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202
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203 // get rid of numerical oddities
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204 if (alpha < 0.0)
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205 alpha = 0.0;
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206 if (alpha > 1.0)
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207 alpha = 1.0;
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208 double u = alpha * (u1 - u2) + u2;
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209
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210 // here is the intersection in world coordinates
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diff changeset
211 Vector intersection;
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diff changeset
212 if(uvxy)
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diff changeset
213 LinearAlgebra::AssignVector(intersection, u, planeV, minZ_);
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diff changeset
214 else
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215 LinearAlgebra::AssignVector(intersection, planeV, u, minZ_);
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216
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diff changeset
217 // and we convert it to plane coordinates
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218 {
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219 double xi, yi;
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diff changeset
220 plane.ProjectPoint(xi, yi, intersection);
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221
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222 // we consider that the x axis is always parallel to the polygons
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223 // TODO: is this hypothesis safe??????
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224 uIntersections.insert(std::lower_bound(uIntersections.begin(), uIntersections.end(), xi), xi);
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225 }
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diff changeset
226 }
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227 }
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228 } // end of for (size_t iPoint = 0; iPoint < pointCount; ++iPoint)
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229
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230 // now we convert the intersections to plane points
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231 // we consider that the x axis is always parallel to the polygons
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232 // TODO: same hypothesis as above: plane is perpendicular to polygons,
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233 // plane is parallel to the XZ (constant Y) or YZ (constant X) 3D planes
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diff changeset
234 for (size_t i = 0; i < uIntersections.size(); ++i)
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235 {
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diff changeset
236 double x = uIntersections[i];
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diff changeset
237 intersections.push_back(Point2D(x, minZ_));
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238 }
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239 } // end of if (pointCount >= 3)
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240 else
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diff changeset
241 {
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diff changeset
242 LOG(ERROR) << "This polygon has " << pointCount << " vertices, which is less than 3 --> skipping";
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243 }
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244 }
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diff changeset
245
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diff changeset
246 void OrthancStone::DicomStructurePolygon2::ProjectOnParallelPlane(
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247 std::vector< std::pair<Point2D, Point2D> >& segments,
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diff changeset
248 const CoordinateSystem3D& plane) const
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249 {
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250 if (points_.size() < 3)
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diff changeset
251 return;
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diff changeset
252
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Benjamin Golinvaux <bgo@osimis.io>
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253 // the plane is horizontal
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254 ORTHANC_ASSERT(LinearAlgebra::IsNear(plane.GetNormal()[0], 0.0));
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255 ORTHANC_ASSERT(LinearAlgebra::IsNear(plane.GetNormal()[1], 0.0));
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256
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257 size_t pointCount = GetPointCount();
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258
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259 segments.clear();
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260 segments.reserve(points_.size());
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261 // since the returned values need to be expressed in the supplied coordinate
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262 // system, we need to subtract origin_ from the returned points
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263
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264 double planeOriginX = plane.GetOrigin()[0];
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265 double planeOriginY = plane.GetOrigin()[1];
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266
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267 // precondition: points_.size() >= 3
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268 for (size_t j = 0; j < points_.size()-1; ++j)
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269 {
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270 // segment between point j and j+1
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271
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272 const Point3D& point0 = GetPoint(j);
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273 // subtract plane origin x and y
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274 Point2D p0(point0[0] - planeOriginX, point0[1] - planeOriginY);
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275
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276 const Point3D& point1 = GetPoint(j+1);
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277 // subtract plane origin x and y
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278 Point2D p1(point1[0] - planeOriginX, point1[1] - planeOriginY);
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279
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280 segments.push_back(std::pair<Point2D, Point2D>(p0,p1));
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281 }
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282
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283
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284 // final segment
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285
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286 const Point3D& point0 = GetPoint(points_.size() - 1);
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287 // subtract plane origin x and y
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288 Point2D p0(point0[0] - planeOriginX, point0[1] - planeOriginY);
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289
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290 const Point3D& point1 = GetPoint(0);
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291 // subtract plane origin x and y
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292 Point2D p1(point1[0] - planeOriginX, point1[1] - planeOriginY);
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293
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294 segments.push_back(std::pair<Point2D, Point2D>(p0, p1));
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295 }
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296
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297 double OrthancStone::DicomStructurePolygon2::GetZ() const
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298 {
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299 ORTHANC_ASSERT(LinearAlgebra::IsNear(normal_[0], 0.0));
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300 ORTHANC_ASSERT(LinearAlgebra::IsNear(normal_[1], 0.0));
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301 ORTHANC_ASSERT(LinearAlgebra::IsNear(minZ_, maxZ_));
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302 return minZ_;
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303 }
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304
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305
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306 }