Mercurial > hg > orthanc-stone

annotate Framework/Toolbox/DicomStructurePolygon2.cpp @ 1039:3a35d8397559

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author Alain Mazy <alain@mazy.be>
date Mon, 07 Oct 2019 22:37:24 +0200
parents 29f5f2031310
children 2d8ab34c8c91
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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
1019
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21 #ifdef BGO_ENABLE_DICOMSTRUCTURESETLOADER2
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22
998
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23 #include "DicomStructurePolygon2.h"
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24
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25 #include "../Toolbox/LinearAlgebra.h"
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26
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27 namespace OrthancStone
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28 {
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29 void DicomStructurePolygon2::ComputeDependentProperties()
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30 {
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31 ORTHANC_ASSERT(state_ == Building);
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32
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33 for (size_t j = 0; j < points_.size(); ++j)
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34 {
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35 // TODO: move to AddPoint!
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36 const Point3D& p = points_[j];
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37 if (p[0] < minX_)
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38 minX_ = p[0];
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39 if (p[0] > maxX_)
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40 maxX_ = p[0];
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41
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42 if (p[1] < minY_)
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43 minY_ = p[1];
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44 if (p[1] > maxY_)
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45 maxY_ = p[1];
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46
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47 if (p[2] < minZ_)
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48 minZ_ = p[2];
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49 if (p[2] > maxZ_)
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50 maxZ_ = p[2];
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51 }
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52
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53 if (LinearAlgebra::IsNear(minX_, maxX_))
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54 {
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55 LinearAlgebra::AssignVector(normal_, 1, 0, 0);
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56 //ORTHANC_ASSERT(!LinearAlgebra::IsNear(minX, maxX));
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57 ORTHANC_ASSERT(!LinearAlgebra::IsNear(minY_, maxY_));
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58 ORTHANC_ASSERT(!LinearAlgebra::IsNear(minZ_, maxZ_));
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59 }
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60 else if (LinearAlgebra::IsNear(minY_, maxY_))
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61 {
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62 LinearAlgebra::AssignVector(normal_, 0, 1, 0);
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63 ORTHANC_ASSERT(!LinearAlgebra::IsNear(minX_, maxX_));
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64 ORTHANC_ASSERT(!LinearAlgebra::IsNear(minZ_, maxZ_));
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65 }
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66 else if (LinearAlgebra::IsNear(minZ_, maxZ_))
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67 {
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68 LinearAlgebra::AssignVector(normal_, 0, 0, 1);
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69 ORTHANC_ASSERT(!LinearAlgebra::IsNear(minX_, maxX_));
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70 ORTHANC_ASSERT(!LinearAlgebra::IsNear(minY_, maxY_));
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71 }
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72 else
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73 {
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74 LOG(ERROR) << "The contour is not coplanar and not parallel to any axis.";
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75 throw Orthanc::OrthancException(Orthanc::ErrorCode_ParameterOutOfRange);
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76 }
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77 state_ = Valid;
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78 }
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79
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80
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81 void DicomStructurePolygon2::ProjectOnConstantPlane(
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82 std::vector<Point2D>& intersections, const CoordinateSystem3D& plane) const
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83 {
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84 // the plane can either have constant X, or constant Y.
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85 // - for constant Z planes, use the ProjectOnParallelPlane method
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86 // - other type of planes are not supported
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87
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88 // V is the coordinate that is constant in the plane
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89 double planeV = 0.0;
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90
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91 // if true, then "u" in the code is "x" and "v" is "y".
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92 // (v is constant in the plane)
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93 bool uvxy = false;
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94
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95 size_t uindex = static_cast<size_t>(-1);
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96 size_t vindex = static_cast<size_t>(-1);
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97
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98 ORTHANC_ASSERT(LinearAlgebra::IsNear(plane.GetNormal()[2], 0.0));
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99
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100 if (LinearAlgebra::IsNear(plane.GetNormal()[1], 0.0))
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101 {
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102 // normal is 1,0,0 (or -1,0,0).
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103 // plane is constant X
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104 uindex = 1;
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105 vindex = 0;
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106
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107 uvxy = false;
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108 planeV = plane.GetOrigin()[0];
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109 if (planeV < minX_)
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110 return;
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111 if (planeV > maxX_)
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112 return;
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113 }
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114 else if (LinearAlgebra::IsNear(plane.GetNormal()[0], 0.0))
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115 {
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116 // normal is 0,1,0 (or 0,-1,0).
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117 // plane is constant Y
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118 uindex = 0;
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119 vindex = 1;
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120
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121 uvxy = true;
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122 planeV = plane.GetOrigin()[1];
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123 if (planeV < minY_)
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124 return;
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125 if (planeV > maxY_)
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126 return;
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127 }
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128 else
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129 {
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130 // if the following assertion(s) fail(s), it means the plane is NOT a constant-X or constant-Y plane
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131 LOG(ERROR) << "Plane normal must be (a,0,0) or (0,a,0), with a == -1 or a == 1";
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132 throw Orthanc::OrthancException(Orthanc::ErrorCode_ParameterOutOfRange);
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133 }
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134
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135 size_t pointCount = GetPointCount();
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136 if (pointCount >= 3)
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137 {
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138 // this vector will contain the coordinates of the intersection points
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139 // between the plane and the polygon.
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140 // these are expressed in the U coordinate, that is either X or Y,
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141 // depending upon the plane orientation
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142 std::vector<double> uIntersections;
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143
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144 // we loop on the segments of the polygon (TODO: optimize)
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145 // and we compute the intersection between each segment and the cut
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146 // cutting plane (slice) has a constant X
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147
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148 for (size_t iPoint = 0; iPoint < pointCount; ++iPoint)
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149 {
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150 double u1 = points_[iPoint][uindex];
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151 double v1 = points_[iPoint][vindex];
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152
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153 double u2 = 0;
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154 double v2 = 0;
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155
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156 if (iPoint < pointCount - 1)
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157 {
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158 u2 = points_[iPoint + 1][uindex];
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159 v2 = points_[iPoint + 1][vindex];
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160 }
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161 else
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162 {
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163 u2 = points_[0][uindex];
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164 v2 = points_[0][vindex];
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165 }
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166
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167 // Check if the segment intersects the plane
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168 if ((std::min(v1, v2) <= planeV) && (std::max(v1, v2) >= planeV))
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169 {
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170 // special case: the segment is parallel to the plane but close to it
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171 if (LinearAlgebra::IsNear(v1, v2))
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172 {
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173 // in that case, we choose to label both points as an intersection
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174 double x, y;
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175 plane.ProjectPoint(x, y, points_[iPoint]);
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176 intersections.push_back(Point2D(x, y));
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177
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178 plane.ProjectPoint(x, y, points_[iPoint + 1]);
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179 intersections.push_back(Point2D(x, y));
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180 }
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181 else
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182 {
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183 // we are looking for u so that (u,planeV) belongs to the segment
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184 // let's define alpha = (u-u2)/(u1-u2) --> u = alpha*(u1-u2) + u2
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185 // alpha = (v2-planeV)/(v2-v1)
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186 // because the following two triangles are similar
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187 // [ (planeY,x) , (y2,x2), (planeY,x2) ] or
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188 // [ (planeX,y) , (x2,y2), (planeX,y2) ]
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189 // and
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190 // [ (y1 ,x1) , (y2,x2), (y1 ,x2) ] or
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191 // [ (x1 ,y1) , (x2,y2), (x1 ,y2) ]
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192
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193 /*
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194 void CoordinateSystem3D::ProjectPoint(double& offsetX,
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195 double& offsetY,
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196 const Vector& point) const
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197 */
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198 double alpha = (v2 - planeV) / (v2 - v1);
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199
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200 // get rid of numerical oddities
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201 if (alpha < 0.0)
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202 alpha = 0.0;
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203 if (alpha > 1.0)
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204 alpha = 1.0;
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205 double u = alpha * (u1 - u2) + u2;
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206
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207 // here is the intersection in world coordinates
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208 Vector intersection;
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209 if(uvxy)
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210 LinearAlgebra::AssignVector(intersection, u, planeV, minZ_);
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211 else
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212 LinearAlgebra::AssignVector(intersection, planeV, u, minZ_);
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213
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diff changeset
214 // and we convert it to plane coordinates
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215 {
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216 double xi, yi;
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217 plane.ProjectPoint(xi, yi, intersection);
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218
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219 // we consider that the x axis is always parallel to the polygons
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220 // TODO: is this hypothesis safe??????
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221 uIntersections.insert(std::lower_bound(uIntersections.begin(), uIntersections.end(), xi), xi);
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222 }
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223 }
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224 }
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225 } // end of for (size_t iPoint = 0; iPoint < pointCount; ++iPoint)
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226
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227 // now we convert the intersections to plane points
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228 // we consider that the x axis is always parallel to the polygons
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229 // TODO: same hypothesis as above: plane is perpendicular to polygons,
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230 // plane is parallel to the XZ (constant Y) or YZ (constant X) 3D planes
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231 for (size_t i = 0; i < uIntersections.size(); ++i)
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232 {
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233 double x = uIntersections[i];
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diff changeset
234 intersections.push_back(Point2D(x, minZ_));
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235 }
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236 } // end of if (pointCount >= 3)
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237 else
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diff changeset
238 {
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diff changeset
239 LOG(ERROR) << "This polygon has " << pointCount << " vertices, which is less than 3 --> skipping";
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240 }
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241 }
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242
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diff changeset
243 void OrthancStone::DicomStructurePolygon2::ProjectOnParallelPlane(
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244 std::vector< std::pair<Point2D, Point2D> >& segments,
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diff changeset
245 const CoordinateSystem3D& plane) const
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246 {
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247 if (points_.size() < 3)
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248 return;
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249
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250 // the plane is horizontal
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251 ORTHANC_ASSERT(LinearAlgebra::IsNear(plane.GetNormal()[0], 0.0));
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252 ORTHANC_ASSERT(LinearAlgebra::IsNear(plane.GetNormal()[1], 0.0));
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253
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254 segments.clear();
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255 segments.reserve(points_.size());
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256 // since the returned values need to be expressed in the supplied coordinate
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257 // system, we need to subtract origin_ from the returned points
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258
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259 double planeOriginX = plane.GetOrigin()[0];
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260 double planeOriginY = plane.GetOrigin()[1];
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261
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262 // precondition: points_.size() >= 3
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263 for (size_t j = 0; j < points_.size()-1; ++j)
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264 {
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265 // segment between point j and j+1
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266
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267 const Point3D& point0 = GetPoint(j);
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268 // subtract plane origin x and y
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269 Point2D p0(point0[0] - planeOriginX, point0[1] - planeOriginY);
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270
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271 const Point3D& point1 = GetPoint(j+1);
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272 // subtract plane origin x and y
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273 Point2D p1(point1[0] - planeOriginX, point1[1] - planeOriginY);
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274
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275 segments.push_back(std::pair<Point2D, Point2D>(p0,p1));
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276 }
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277
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278
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279 // final segment
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280
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281 const Point3D& point0 = GetPoint(points_.size() - 1);
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282 // subtract plane origin x and y
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283 Point2D p0(point0[0] - planeOriginX, point0[1] - planeOriginY);
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284
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285 const Point3D& point1 = GetPoint(0);
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286 // subtract plane origin x and y
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287 Point2D p1(point1[0] - planeOriginX, point1[1] - planeOriginY);
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288
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289 segments.push_back(std::pair<Point2D, Point2D>(p0, p1));
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290 }
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291
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292 double OrthancStone::DicomStructurePolygon2::GetZ() const
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293 {
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294 ORTHANC_ASSERT(LinearAlgebra::IsNear(normal_[0], 0.0));
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295 ORTHANC_ASSERT(LinearAlgebra::IsNear(normal_[1], 0.0));
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296 ORTHANC_ASSERT(LinearAlgebra::IsNear(minZ_, maxZ_));
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297 return minZ_;
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298 }
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299
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300
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301 }
1019
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302
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303 #endif
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304 // BGO_ENABLE_DICOMSTRUCTURESETLOADER2
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305