Mercurial > hg > orthanc-stone
annotate OrthancStone/Sources/Toolbox/UnionOfRectangles.cpp @ 1942:09de7321d3b9
TODO
author | Alain Mazy <am@osimis.io> |
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date | Mon, 16 May 2022 16:27:41 +0200 |
parents | 925aaf49150c |
children | 07964689cb0b |
rev | line source |
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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) 2017-2022 Osimis S.A., Belgium |
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6 * Copyright (C) 2021-2022 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 |
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24 #include "UnionOfRectangles.h" |
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25 |
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26 #include "Internals/OrientedIntegerLine2D.h" |
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27 #include "Internals/RectanglesIntegerProjection.h" |
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28 #include "SegmentTree.h" |
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29 |
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30 #include <OrthancException.h> |
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31 |
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32 #include <stack> |
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33 |
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34 |
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35 namespace OrthancStone |
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36 { |
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37 class UnionOfRectangles::Payload : public Orthanc::IDynamicObject |
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38 { |
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39 private: |
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40 int counter_; |
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41 Status status_; |
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42 |
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43 public: |
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44 Payload() : |
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45 counter_(0), |
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46 status_(Status_Empty) |
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47 { |
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48 } |
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49 |
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50 int GetCounter() const |
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51 { |
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52 return counter_; |
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53 } |
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54 |
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55 Status GetStatus() const |
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56 { |
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57 return status_; |
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58 } |
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59 |
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60 void SetStatus(Status status) |
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61 { |
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62 status_ = status; |
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63 } |
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64 |
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65 void Increment() |
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66 { |
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67 counter_ ++; |
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68 } |
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69 |
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70 void Decrement() |
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71 { |
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72 if (counter_ == 0) |
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73 { |
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74 throw Orthanc::OrthancException(Orthanc::ErrorCode_InternalError); |
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75 } |
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76 else |
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77 { |
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78 counter_ --; |
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79 } |
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80 } |
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81 }; |
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82 |
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83 |
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84 class UnionOfRectangles::Factory : public SegmentTree::IPayloadFactory |
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85 { |
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86 public: |
1876 | 87 virtual Orthanc::IDynamicObject* Create() ORTHANC_OVERRIDE |
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88 { |
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89 return new Payload; |
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90 } |
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91 }; |
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92 |
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93 |
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94 class UnionOfRectangles::Visitor : public SegmentTree::IVisitor |
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95 { |
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96 private: |
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97 Operation operation_; |
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98 |
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99 public: |
1878 | 100 explicit Visitor(Operation operation) : |
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101 operation_(operation) |
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102 { |
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103 } |
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104 |
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105 virtual void Visit(const SegmentTree& node, |
1876 | 106 bool fullyInside) ORTHANC_OVERRIDE |
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107 { |
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108 Payload& payload = node.GetTypedPayload<Payload>(); |
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109 |
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110 if (fullyInside) |
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111 { |
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112 switch (operation_) |
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113 { |
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114 case Operation_Insert: |
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115 payload.Increment(); |
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116 break; |
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117 |
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118 case Operation_Delete: |
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119 payload.Decrement(); |
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120 break; |
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121 |
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122 default: |
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123 throw Orthanc::OrthancException(Orthanc::ErrorCode_InternalError); |
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124 } |
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125 } |
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126 |
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127 if (payload.GetCounter() > 0) |
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128 { |
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129 payload.SetStatus(Status_Full); |
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130 } |
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131 else if (node.IsLeaf()) |
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132 { |
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133 payload.SetStatus(Status_Empty); |
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134 } |
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135 else if (node.GetLeftChild().GetTypedPayload<Payload>().GetStatus() == Status_Empty && |
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136 node.GetRightChild().GetTypedPayload<Payload>().GetStatus() == Status_Empty) |
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137 { |
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138 payload.SetStatus(Status_Empty); |
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139 } |
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140 else |
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141 { |
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142 payload.SetStatus(Status_Partial); |
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143 } |
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144 } |
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145 |
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146 |
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147 // This is the "CONTR()" function from the textbook |
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148 static void IntersectComplement(std::stack<size_t>& stack, |
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149 size_t low, |
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150 size_t high, |
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151 const SegmentTree& node) |
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152 { |
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153 if (low >= high) |
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154 { |
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155 throw Orthanc::OrthancException(Orthanc::ErrorCode_ParameterOutOfRange); |
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156 } |
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157 |
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158 Status status = node.GetTypedPayload<Payload>().GetStatus(); |
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159 |
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160 if (status != Status_Full) |
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161 { |
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162 assert(status == Status_Partial || |
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163 status == Status_Empty); |
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164 |
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165 // Aliases to use the same variable names as in the textbook |
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166 const size_t& b = low; |
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167 const size_t& e = high; |
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168 const size_t& bv = node.GetLowBound(); |
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169 const size_t& ev = node.GetHighBound(); |
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170 |
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171 if (b <= bv && |
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172 ev <= e && |
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173 status == Status_Empty) |
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174 { |
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175 // [B[v], E[v]] is contributed |
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176 if (!stack.empty() && |
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177 stack.top() == bv) |
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178 { |
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179 stack.pop(); // Merge continuous segments |
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180 } |
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181 else |
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182 { |
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183 stack.push(bv); // Beginning of edge |
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184 } |
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185 |
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186 stack.push(ev); // Current termination of edge |
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187 } |
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188 else |
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189 { |
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190 size_t middle = (bv + ev) / 2; |
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191 |
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192 if (b < middle) |
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193 { |
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194 IntersectComplement(stack, b, e, node.GetLeftChild()); |
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195 } |
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196 |
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197 if (middle < e) |
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198 { |
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199 IntersectComplement(stack, b, e, node.GetRightChild()); |
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200 } |
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201 } |
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202 } |
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203 } |
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204 }; |
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205 |
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206 |
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207 static void AddVerticalEdges(std::list<Internals::OrientedIntegerLine2D>& edges, |
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208 std::stack<size_t>& stack, |
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209 size_t x, |
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210 bool isLeft) |
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211 { |
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212 if (stack.size() % 2 != 0) |
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213 { |
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214 throw Orthanc::OrthancException(Orthanc::ErrorCode_InternalError); |
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215 } |
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216 |
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217 typedef std::pair<size_t, size_t> Interval; |
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218 |
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219 std::list<Interval> intervals; |
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220 |
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221 while (!stack.empty()) |
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222 { |
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223 size_t high = stack.top(); |
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224 stack.pop(); |
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225 size_t low = stack.top(); |
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226 stack.pop(); |
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227 |
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228 if (!intervals.empty() && |
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229 intervals.back().second == low) |
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230 { |
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231 // Extend the previous interval |
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232 intervals.back().second = high; |
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233 } |
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234 else |
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235 { |
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236 intervals.push_back(std::make_pair(low, high)); |
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237 } |
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238 } |
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239 |
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240 for (std::list<Interval>::const_iterator |
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241 it = intervals.begin(); it != intervals.end(); ++it) |
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242 { |
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243 if (it->first >= it->second) |
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244 { |
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245 throw Orthanc::OrthancException(Orthanc::ErrorCode_ParameterOutOfRange); |
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246 } |
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247 |
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248 // By convention, the left sides go downward, and the right go upward |
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249 if (isLeft) |
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250 { |
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251 if (!edges.empty() && |
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252 edges.back().GetX1() == x && |
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253 edges.back().GetX2() == x && |
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254 edges.back().GetY1() == it->second && |
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255 edges.back().GetY2() == it->first) |
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256 { |
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257 // The two successive vertical segments cancel each other |
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258 edges.pop_back(); |
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259 } |
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260 else |
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261 { |
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262 edges.push_back(Internals::OrientedIntegerLine2D(x, it->first, x, it->second)); |
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263 } |
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264 } |
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265 else |
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266 { |
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267 if (!edges.empty() && |
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268 edges.back().GetX1() == x && |
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269 edges.back().GetX2() == x && |
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270 edges.back().GetY1() == it->first && |
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271 edges.back().GetY2() == it->second) |
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272 { |
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273 // The two successive vertical segments cancel each other |
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274 edges.pop_back(); |
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275 } |
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276 else |
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277 { |
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278 edges.push_back(Internals::OrientedIntegerLine2D(x, it->second, x, it->first)); |
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279 } |
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280 } |
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281 } |
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282 } |
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283 |
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284 |
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285 class UnionOfRectangles::VerticalSide |
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286 { |
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287 private: |
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288 size_t x_; |
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289 bool isLeft_; |
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290 size_t y1_; |
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291 size_t y2_; |
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292 |
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293 public: |
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294 VerticalSide(size_t x, |
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295 bool isLeft, |
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296 size_t y1, |
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297 size_t y2) : |
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298 x_(x), |
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299 isLeft_(isLeft), |
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300 y1_(y1), |
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301 y2_(y2) |
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302 { |
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303 assert(y1 < y2); |
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304 } |
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305 |
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306 size_t GetX() const |
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307 { |
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308 return x_; |
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309 } |
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310 |
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311 bool IsLeft() const |
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312 { |
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313 return isLeft_; |
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314 } |
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315 |
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316 size_t GetY1() const |
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317 { |
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318 return y1_; |
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319 } |
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320 |
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321 size_t GetY2() const |
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322 { |
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323 return y2_; |
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324 } |
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325 |
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326 bool operator< (const VerticalSide& other) const |
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327 { |
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328 if (x_ < other.x_) |
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329 { |
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330 return true; |
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331 } |
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332 else if (x_ == other.x_) |
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333 { |
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334 return static_cast<int>(isLeft_) < static_cast<int>(other.isLeft_); |
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335 } |
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336 else |
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337 { |
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338 return false; |
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339 } |
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340 } |
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341 |
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342 bool Equals(const VerticalSide& other) const |
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343 { |
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344 return (x_ == other.x_ && |
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345 isLeft_ == other.isLeft_); |
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346 } |
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347 }; |
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348 |
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349 |
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350 class UnionOfRectangles::HorizontalJunction |
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351 { |
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352 private: |
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353 size_t x_; |
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354 size_t y_; |
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355 size_t ybis_; |
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356 bool downward_; |
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357 |
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358 public: |
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359 HorizontalJunction(size_t x, |
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360 size_t y, |
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361 size_t ybis, |
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362 bool downward) : |
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363 x_(x), |
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364 y_(y), |
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365 ybis_(ybis), |
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366 downward_(downward) |
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367 { |
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368 } |
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369 |
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370 size_t GetX() const |
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371 { |
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372 return x_; |
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373 } |
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374 |
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375 size_t GetY() const |
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376 { |
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377 return y_; |
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378 } |
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379 |
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380 size_t GetYBis() const |
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381 { |
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382 return ybis_; |
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383 } |
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384 |
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385 bool IsDownward() const |
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386 { |
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387 return downward_; |
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388 } |
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389 |
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390 bool operator< (const HorizontalJunction& other) const |
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391 { |
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392 if (y_ > other.y_) |
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393 { |
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394 return true; |
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395 } |
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396 else if (y_ == other.y_) |
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397 { |
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398 return x_ < other.x_; |
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399 } |
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400 else |
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401 { |
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402 return false; |
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403 } |
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404 } |
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405 }; |
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406 |
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407 |
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408 void UnionOfRectangles::Apply(std::list< std::vector<ScenePoint2D> >& contours, |
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409 const std::list<Extent2D>& rectangles) |
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410 { |
1876 | 411 contours.clear(); |
412 | |
1875
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413 /** |
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414 * STEP 1 |
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415 **/ |
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416 Internals::RectanglesIntegerProjection horizontalProjection(rectangles, true); |
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417 Internals::RectanglesIntegerProjection verticalProjection(rectangles, false); |
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418 |
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419 assert(horizontalProjection.GetProjectedRectanglesCount() == verticalProjection.GetProjectedRectanglesCount()); |
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420 |
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421 /** |
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422 * STEP 2 |
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423 **/ |
1876 | 424 if (verticalProjection.GetEndpointsCount() == 0) |
425 { | |
426 return; | |
427 } | |
428 | |
1875
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429 Factory factory; |
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430 SegmentTree tree(0, verticalProjection.GetEndpointsCount() - 1, factory); |
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431 |
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432 |
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433 /** |
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434 * STEP 3 |
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435 **/ |
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436 std::vector<VerticalSide> verticalSides; |
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437 |
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438 const size_t countRectangles = horizontalProjection.GetProjectedRectanglesCount(); |
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439 |
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440 verticalSides.reserve(2 * countRectangles); |
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441 |
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442 for (size_t i = 0; i < countRectangles; i++) |
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443 { |
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444 size_t horizontalLow = horizontalProjection.GetProjectedRectangleLow(i); |
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445 size_t horizontalHigh = horizontalProjection.GetProjectedRectangleHigh(i); |
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446 size_t verticalLow = verticalProjection.GetProjectedRectangleLow(i); |
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447 size_t verticalHigh = verticalProjection.GetProjectedRectangleHigh(i); |
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448 |
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449 verticalSides.push_back(VerticalSide(horizontalLow, true, verticalLow, verticalHigh)); |
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450 verticalSides.push_back(VerticalSide(horizontalHigh, false, verticalLow, verticalHigh)); |
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451 } |
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452 |
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453 assert(verticalSides.size() == 2 * countRectangles); |
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454 |
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455 std::sort(verticalSides.begin(), verticalSides.end()); |
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456 |
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457 |
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458 /** |
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459 * STEP 4 |
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460 **/ |
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461 std::list<Internals::OrientedIntegerLine2D> verticalEdges; |
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462 std::stack<size_t> stack; |
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463 |
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464 for (size_t i = 0; i < verticalSides.size(); i++) |
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465 { |
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466 if (i > 0 && |
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467 !verticalSides[i].Equals(verticalSides[i - 1])) |
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468 { |
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469 // Output the stack |
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470 AddVerticalEdges(verticalEdges, stack, verticalSides[i - 1].GetX(), |
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471 verticalSides[i - 1].IsLeft()); |
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472 } |
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473 |
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474 size_t y1 = verticalSides[i].GetY1(); |
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475 size_t y2 = verticalSides[i].GetY2(); |
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476 |
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477 if (verticalSides[i].IsLeft()) |
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478 { |
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479 Visitor::IntersectComplement(stack, y1, y2, tree); |
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480 |
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481 Visitor visitor(Operation_Insert); |
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482 tree.VisitSegment(y1, y2, visitor); |
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483 } |
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484 else |
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|
485 { |
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486 Visitor visitor(Operation_Delete); |
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487 tree.VisitSegment(y1, y2, visitor); |
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488 |
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489 Visitor::IntersectComplement(stack, y1, y2, tree); |
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490 } |
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|
491 } |
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492 |
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493 if (!verticalSides.empty() && |
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494 !stack.empty()) |
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|
495 { |
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496 AddVerticalEdges(verticalEdges, stack, verticalSides.back().GetX(), |
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497 verticalSides.back().IsLeft()); |
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498 } |
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499 |
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500 |
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501 /** |
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502 * STEP 5: Horizontal edges |
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503 **/ |
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504 std::vector<HorizontalJunction> horizontalJunctions; |
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505 horizontalJunctions.reserve(2 * verticalEdges.size()); |
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506 |
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507 for (std::list<Internals::OrientedIntegerLine2D>::const_iterator |
1878 | 508 it = verticalEdges.begin(); it != verticalEdges.end(); ++it) |
1875
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509 { |
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510 assert(it->GetX1() == it->GetX2()); |
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511 horizontalJunctions.push_back(HorizontalJunction(it->GetX1(), it->GetY1(), it->GetY2(), it->IsDownward())); |
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512 horizontalJunctions.push_back(HorizontalJunction(it->GetX1(), it->GetY2(), it->GetY1(), it->IsDownward())); |
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513 } |
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514 |
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515 assert(horizontalJunctions.size() == 2 * verticalEdges.size()); |
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516 std::sort(horizontalJunctions.begin(), horizontalJunctions.end()); |
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517 |
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518 std::list<Internals::OrientedIntegerLine2D> horizontalEdges; |
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519 for (size_t i = 0; i < horizontalJunctions.size(); i += 2) |
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520 { |
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521 size_t x1 = horizontalJunctions[i].GetX(); |
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522 size_t x2 = horizontalJunctions[i + 1].GetX(); |
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523 size_t y = horizontalJunctions[i].GetY(); |
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524 |
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525 if ((horizontalJunctions[i].IsDownward() && y > horizontalJunctions[i].GetYBis()) || |
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526 (!horizontalJunctions[i].IsDownward() && y < horizontalJunctions[i].GetYBis())) |
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527 { |
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528 horizontalEdges.push_back(Internals::OrientedIntegerLine2D(x1, y, x2, y)); |
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529 } |
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530 else |
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531 { |
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532 horizontalEdges.push_back(Internals::OrientedIntegerLine2D(x2, y, x1, y)); |
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533 } |
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534 } |
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535 |
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536 |
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537 /** |
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538 * POST-PROCESSING: Combine the separate sets of horizontal and |
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539 * vertical edges, into a set of 2D chains |
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540 **/ |
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541 std::vector<Internals::OrientedIntegerLine2D> allEdges; |
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542 allEdges.reserve(horizontalEdges.size() + verticalEdges.size()); |
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543 |
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544 for (std::list<Internals::OrientedIntegerLine2D>::const_iterator |
1878 | 545 it = horizontalEdges.begin(); it != horizontalEdges.end(); ++it) |
1875
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546 { |
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547 allEdges.push_back(*it); |
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548 } |
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549 |
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550 for (std::list<Internals::OrientedIntegerLine2D>::const_iterator |
1878 | 551 it = verticalEdges.begin(); it != verticalEdges.end(); ++it) |
1875
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552 { |
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553 allEdges.push_back(*it); |
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554 } |
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555 |
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556 assert(allEdges.size() == horizontalEdges.size() + verticalEdges.size()); |
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557 |
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558 std::list<Internals::OrientedIntegerLine2D::Chain> chains; |
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559 Internals::OrientedIntegerLine2D::ExtractChains(chains, allEdges); |
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560 |
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561 for (std::list<Internals::OrientedIntegerLine2D::Chain>::const_iterator |
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562 it = chains.begin(); it != chains.end(); ++it) |
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563 { |
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564 assert(!it->empty()); |
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565 |
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566 std::vector<ScenePoint2D> chain; |
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567 chain.reserve(it->size()); |
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568 |
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569 for (Internals::OrientedIntegerLine2D::Chain::const_iterator |
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570 it2 = it->begin(); it2 != it->end(); ++it2) |
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571 { |
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572 chain.push_back(ScenePoint2D(horizontalProjection.GetEndpointCoordinate(it2->first), |
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573 verticalProjection.GetEndpointCoordinate(it2->second))); |
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574 } |
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575 |
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576 assert(!chain.empty()); |
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577 contours.push_back(chain); |
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578 } |
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579 } |
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580 } |