Mercurial > hg > orthanc-stone

annotate OrthancStone/Sources/Toolbox/UnionOfRectangles.cpp @ 1878:c9ccd13c6a3c

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author Sebastien Jodogne <s.jodogne@gmail.com>
date Wed, 12 Jan 2022 08:27:26 +0100
parents b1f510e601d2
children e318b524ad3f
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1875
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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:
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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:
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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,
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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 std::runtime_error("internal error");
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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 std::runtime_error("parameter out of range");
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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 edges.push_back(Internals::OrientedIntegerLine2D(x, it->first, x, it->second));
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252 }
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253 else
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254 {
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255 edges.push_back(Internals::OrientedIntegerLine2D(x, it->second, x, it->first));
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256 }
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257 }
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258 }
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259
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260
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261 class UnionOfRectangles::VerticalSide
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262 {
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263 private:
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264 size_t x_;
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265 bool isLeft_;
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266 size_t y1_;
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267 size_t y2_;
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268
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269 public:
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270 VerticalSide(size_t x,
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271 bool isLeft,
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272 size_t y1,
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273 size_t y2) :
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274 x_(x),
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275 isLeft_(isLeft),
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276 y1_(y1),
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277 y2_(y2)
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278 {
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279 assert(y1 < y2);
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280 }
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281
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282 size_t GetX() const
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283 {
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284 return x_;
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285 }
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286
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287 bool IsLeft() const
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288 {
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289 return isLeft_;
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290 }
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291
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292 size_t GetY1() const
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293 {
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294 return y1_;
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295 }
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296
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297 size_t GetY2() const
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298 {
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299 return y2_;
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300 }
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Sebastien Jodogne <s.jodogne@gmail.com>
parents:
diff changeset
301
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Sebastien Jodogne <s.jodogne@gmail.com>
parents:
diff changeset
302 bool operator< (const VerticalSide& other) const
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Sebastien Jodogne <s.jodogne@gmail.com>
parents:
diff changeset
303 {
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Sebastien Jodogne <s.jodogne@gmail.com>
parents:
diff changeset
304 if (x_ < other.x_)
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Sebastien Jodogne <s.jodogne@gmail.com>
parents:
diff changeset
305 {
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Sebastien Jodogne <s.jodogne@gmail.com>
parents:
diff changeset
306 return true;
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Sebastien Jodogne <s.jodogne@gmail.com>
parents:
diff changeset
307 }
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Sebastien Jodogne <s.jodogne@gmail.com>
parents:
diff changeset
308 else if (x_ == other.x_)
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Sebastien Jodogne <s.jodogne@gmail.com>
parents:
diff changeset
309 {
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Sebastien Jodogne <s.jodogne@gmail.com>
parents:
diff changeset
310 return isLeft_;
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Sebastien Jodogne <s.jodogne@gmail.com>
parents:
diff changeset
311 }
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Sebastien Jodogne <s.jodogne@gmail.com>
parents:
diff changeset
312 else
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Sebastien Jodogne <s.jodogne@gmail.com>
parents:
diff changeset
313 {
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Sebastien Jodogne <s.jodogne@gmail.com>
parents:
diff changeset
314 return false;
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Sebastien Jodogne <s.jodogne@gmail.com>
parents:
diff changeset
315 }
b896f20d24ca added UnionOfRectangles algorithm
Sebastien Jodogne <s.jodogne@gmail.com>
parents:
diff changeset
316 }
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Sebastien Jodogne <s.jodogne@gmail.com>
parents:
diff changeset
317
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Sebastien Jodogne <s.jodogne@gmail.com>
parents:
diff changeset
318 bool Equals(const VerticalSide& other) const
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Sebastien Jodogne <s.jodogne@gmail.com>
parents:
diff changeset
319 {
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Sebastien Jodogne <s.jodogne@gmail.com>
parents:
diff changeset
320 return (x_ == other.x_ &&
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Sebastien Jodogne <s.jodogne@gmail.com>
parents:
diff changeset
321 isLeft_ == other.isLeft_);
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Sebastien Jodogne <s.jodogne@gmail.com>
parents:
diff changeset
322 }
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Sebastien Jodogne <s.jodogne@gmail.com>
parents:
diff changeset
323 };
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Sebastien Jodogne <s.jodogne@gmail.com>
parents:
diff changeset
324
b896f20d24ca added UnionOfRectangles algorithm
Sebastien Jodogne <s.jodogne@gmail.com>
parents:
diff changeset
325
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Sebastien Jodogne <s.jodogne@gmail.com>
parents:
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326 class UnionOfRectangles::HorizontalJunction
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Sebastien Jodogne <s.jodogne@gmail.com>
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327 {
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Sebastien Jodogne <s.jodogne@gmail.com>
parents:
diff changeset
328 private:
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Sebastien Jodogne <s.jodogne@gmail.com>
parents:
diff changeset
329 size_t x_;
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Sebastien Jodogne <s.jodogne@gmail.com>
parents:
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330 size_t y_;
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Sebastien Jodogne <s.jodogne@gmail.com>
parents:
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331 size_t ybis_;
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Sebastien Jodogne <s.jodogne@gmail.com>
parents:
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332 bool downward_;
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Sebastien Jodogne <s.jodogne@gmail.com>
parents:
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333
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Sebastien Jodogne <s.jodogne@gmail.com>
parents:
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334 public:
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Sebastien Jodogne <s.jodogne@gmail.com>
parents:
diff changeset
335 HorizontalJunction(size_t x,
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Sebastien Jodogne <s.jodogne@gmail.com>
parents:
diff changeset
336 size_t y,
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Sebastien Jodogne <s.jodogne@gmail.com>
parents:
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337 size_t ybis,
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Sebastien Jodogne <s.jodogne@gmail.com>
parents:
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338 bool downward) :
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parents:
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339 x_(x),
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340 y_(y),
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Sebastien Jodogne <s.jodogne@gmail.com>
parents:
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341 ybis_(ybis),
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Sebastien Jodogne <s.jodogne@gmail.com>
parents:
diff changeset
342 downward_(downward)
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Sebastien Jodogne <s.jodogne@gmail.com>
parents:
diff changeset
343 {
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parents:
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344 }
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parents:
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345
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Sebastien Jodogne <s.jodogne@gmail.com>
parents:
diff changeset
346 size_t GetX() const
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diff changeset
347 {
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diff changeset
348 return x_;
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parents:
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349 }
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parents:
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350
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Sebastien Jodogne <s.jodogne@gmail.com>
parents:
diff changeset
351 size_t GetY() const
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Sebastien Jodogne <s.jodogne@gmail.com>
parents:
diff changeset
352 {
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Sebastien Jodogne <s.jodogne@gmail.com>
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diff changeset
353 return y_;
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parents:
diff changeset
354 }
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Sebastien Jodogne <s.jodogne@gmail.com>
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diff changeset
355
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Sebastien Jodogne <s.jodogne@gmail.com>
parents:
diff changeset
356 size_t GetYBis() const
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Sebastien Jodogne <s.jodogne@gmail.com>
parents:
diff changeset
357 {
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358 return ybis_;
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Sebastien Jodogne <s.jodogne@gmail.com>
parents:
diff changeset
359 }
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Sebastien Jodogne <s.jodogne@gmail.com>
parents:
diff changeset
360
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Sebastien Jodogne <s.jodogne@gmail.com>
parents:
diff changeset
361 bool IsDownward() const
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Sebastien Jodogne <s.jodogne@gmail.com>
parents:
diff changeset
362 {
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Sebastien Jodogne <s.jodogne@gmail.com>
parents:
diff changeset
363 return downward_;
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Sebastien Jodogne <s.jodogne@gmail.com>
parents:
diff changeset
364 }
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Sebastien Jodogne <s.jodogne@gmail.com>
parents:
diff changeset
365
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Sebastien Jodogne <s.jodogne@gmail.com>
parents:
diff changeset
366 bool operator< (const HorizontalJunction& other) const
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Sebastien Jodogne <s.jodogne@gmail.com>
parents:
diff changeset
367 {
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Sebastien Jodogne <s.jodogne@gmail.com>
parents:
diff changeset
368 if (y_ > other.y_)
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Sebastien Jodogne <s.jodogne@gmail.com>
parents:
diff changeset
369 {
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Sebastien Jodogne <s.jodogne@gmail.com>
parents:
diff changeset
370 return true;
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Sebastien Jodogne <s.jodogne@gmail.com>
parents:
diff changeset
371 }
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Sebastien Jodogne <s.jodogne@gmail.com>
parents:
diff changeset
372 else if (y_ == other.y_)
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Sebastien Jodogne <s.jodogne@gmail.com>
parents:
diff changeset
373 {
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Sebastien Jodogne <s.jodogne@gmail.com>
parents:
diff changeset
374 return x_ < other.x_;
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Sebastien Jodogne <s.jodogne@gmail.com>
parents:
diff changeset
375 }
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Sebastien Jodogne <s.jodogne@gmail.com>
parents:
diff changeset
376 else
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Sebastien Jodogne <s.jodogne@gmail.com>
parents:
diff changeset
377 {
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Sebastien Jodogne <s.jodogne@gmail.com>
parents:
diff changeset
378 return false;
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Sebastien Jodogne <s.jodogne@gmail.com>
parents:
diff changeset
379 }
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Sebastien Jodogne <s.jodogne@gmail.com>
parents:
diff changeset
380 }
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Sebastien Jodogne <s.jodogne@gmail.com>
parents:
diff changeset
381 };
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Sebastien Jodogne <s.jodogne@gmail.com>
parents:
diff changeset
382
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Sebastien Jodogne <s.jodogne@gmail.com>
parents:
diff changeset
383
b896f20d24ca added UnionOfRectangles algorithm
Sebastien Jodogne <s.jodogne@gmail.com>
parents:
diff changeset
384 void UnionOfRectangles::Apply(std::list< std::vector<ScenePoint2D> >& contours,
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Sebastien Jodogne <s.jodogne@gmail.com>
parents:
diff changeset
385 const std::list<Extent2D>& rectangles)
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Sebastien Jodogne <s.jodogne@gmail.com>
parents:
diff changeset
386 {
1876
b1f510e601d2 more unit tests
Sebastien Jodogne <s.jodogne@gmail.com>
parents: 1875
diff changeset
387 contours.clear();
b1f510e601d2 more unit tests
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parents: 1875
diff changeset
388
1875
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Sebastien Jodogne <s.jodogne@gmail.com>
parents:
diff changeset
389 /**
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Sebastien Jodogne <s.jodogne@gmail.com>
parents:
diff changeset
390 * STEP 1
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Sebastien Jodogne <s.jodogne@gmail.com>
parents:
diff changeset
391 **/
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Sebastien Jodogne <s.jodogne@gmail.com>
parents:
diff changeset
392 Internals::RectanglesIntegerProjection horizontalProjection(rectangles, true);
b896f20d24ca added UnionOfRectangles algorithm
Sebastien Jodogne <s.jodogne@gmail.com>
parents:
diff changeset
393 Internals::RectanglesIntegerProjection verticalProjection(rectangles, false);
b896f20d24ca added UnionOfRectangles algorithm
Sebastien Jodogne <s.jodogne@gmail.com>
parents:
diff changeset
394
b896f20d24ca added UnionOfRectangles algorithm
Sebastien Jodogne <s.jodogne@gmail.com>
parents:
diff changeset
395 assert(horizontalProjection.GetProjectedRectanglesCount() == verticalProjection.GetProjectedRectanglesCount());
b896f20d24ca added UnionOfRectangles algorithm
Sebastien Jodogne <s.jodogne@gmail.com>
parents:
diff changeset
396
b896f20d24ca added UnionOfRectangles algorithm
Sebastien Jodogne <s.jodogne@gmail.com>
parents:
diff changeset
397 /**
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Sebastien Jodogne <s.jodogne@gmail.com>
parents:
diff changeset
398 * STEP 2
b896f20d24ca added UnionOfRectangles algorithm
Sebastien Jodogne <s.jodogne@gmail.com>
parents:
diff changeset
399 **/
1876
b1f510e601d2 more unit tests
Sebastien Jodogne <s.jodogne@gmail.com>
parents: 1875
diff changeset
400 if (verticalProjection.GetEndpointsCount() == 0)
b1f510e601d2 more unit tests
Sebastien Jodogne <s.jodogne@gmail.com>
parents: 1875
diff changeset
401 {
b1f510e601d2 more unit tests
Sebastien Jodogne <s.jodogne@gmail.com>
parents: 1875
diff changeset
402 return;
b1f510e601d2 more unit tests
Sebastien Jodogne <s.jodogne@gmail.com>
parents: 1875
diff changeset
403 }
b1f510e601d2 more unit tests
Sebastien Jodogne <s.jodogne@gmail.com>
parents: 1875
diff changeset
404
1875
b896f20d24ca added UnionOfRectangles algorithm
Sebastien Jodogne <s.jodogne@gmail.com>
parents:
diff changeset
405 Factory factory;
b896f20d24ca added UnionOfRectangles algorithm
Sebastien Jodogne <s.jodogne@gmail.com>
parents:
diff changeset
406 SegmentTree tree(0, verticalProjection.GetEndpointsCount() - 1, factory);
b896f20d24ca added UnionOfRectangles algorithm
Sebastien Jodogne <s.jodogne@gmail.com>
parents:
diff changeset
407
b896f20d24ca added UnionOfRectangles algorithm
Sebastien Jodogne <s.jodogne@gmail.com>
parents:
diff changeset
408
b896f20d24ca added UnionOfRectangles algorithm
Sebastien Jodogne <s.jodogne@gmail.com>
parents:
diff changeset
409 /**
b896f20d24ca added UnionOfRectangles algorithm
Sebastien Jodogne <s.jodogne@gmail.com>
parents:
diff changeset
410 * STEP 3
b896f20d24ca added UnionOfRectangles algorithm
Sebastien Jodogne <s.jodogne@gmail.com>
parents:
diff changeset
411 **/
b896f20d24ca added UnionOfRectangles algorithm
Sebastien Jodogne <s.jodogne@gmail.com>
parents:
diff changeset
412 std::vector<VerticalSide> verticalSides;
b896f20d24ca added UnionOfRectangles algorithm
Sebastien Jodogne <s.jodogne@gmail.com>
parents:
diff changeset
413
b896f20d24ca added UnionOfRectangles algorithm
Sebastien Jodogne <s.jodogne@gmail.com>
parents:
diff changeset
414 const size_t countRectangles = horizontalProjection.GetProjectedRectanglesCount();
b896f20d24ca added UnionOfRectangles algorithm
Sebastien Jodogne <s.jodogne@gmail.com>
parents:
diff changeset
415
b896f20d24ca added UnionOfRectangles algorithm
Sebastien Jodogne <s.jodogne@gmail.com>
parents:
diff changeset
416 verticalSides.reserve(2 * countRectangles);
b896f20d24ca added UnionOfRectangles algorithm
Sebastien Jodogne <s.jodogne@gmail.com>
parents:
diff changeset
417
b896f20d24ca added UnionOfRectangles algorithm
Sebastien Jodogne <s.jodogne@gmail.com>
parents:
diff changeset
418 for (size_t i = 0; i < countRectangles; i++)
b896f20d24ca added UnionOfRectangles algorithm
Sebastien Jodogne <s.jodogne@gmail.com>
parents:
diff changeset
419 {
b896f20d24ca added UnionOfRectangles algorithm
Sebastien Jodogne <s.jodogne@gmail.com>
parents:
diff changeset
420 size_t horizontalLow = horizontalProjection.GetProjectedRectangleLow(i);
b896f20d24ca added UnionOfRectangles algorithm
Sebastien Jodogne <s.jodogne@gmail.com>
parents:
diff changeset
421 size_t horizontalHigh = horizontalProjection.GetProjectedRectangleHigh(i);
b896f20d24ca added UnionOfRectangles algorithm
Sebastien Jodogne <s.jodogne@gmail.com>
parents:
diff changeset
422 size_t verticalLow = verticalProjection.GetProjectedRectangleLow(i);
b896f20d24ca added UnionOfRectangles algorithm
Sebastien Jodogne <s.jodogne@gmail.com>
parents:
diff changeset
423 size_t verticalHigh = verticalProjection.GetProjectedRectangleHigh(i);
b896f20d24ca added UnionOfRectangles algorithm
Sebastien Jodogne <s.jodogne@gmail.com>
parents:
diff changeset
424
b896f20d24ca added UnionOfRectangles algorithm
Sebastien Jodogne <s.jodogne@gmail.com>
parents:
diff changeset
425 verticalSides.push_back(VerticalSide(horizontalLow, true, verticalLow, verticalHigh));
b896f20d24ca added UnionOfRectangles algorithm
Sebastien Jodogne <s.jodogne@gmail.com>
parents:
diff changeset
426 verticalSides.push_back(VerticalSide(horizontalHigh, false, verticalLow, verticalHigh));
b896f20d24ca added UnionOfRectangles algorithm
Sebastien Jodogne <s.jodogne@gmail.com>
parents:
diff changeset
427 }
b896f20d24ca added UnionOfRectangles algorithm
Sebastien Jodogne <s.jodogne@gmail.com>
parents:
diff changeset
428
b896f20d24ca added UnionOfRectangles algorithm
Sebastien Jodogne <s.jodogne@gmail.com>
parents:
diff changeset
429 assert(verticalSides.size() == 2 * countRectangles);
b896f20d24ca added UnionOfRectangles algorithm
Sebastien Jodogne <s.jodogne@gmail.com>
parents:
diff changeset
430
b896f20d24ca added UnionOfRectangles algorithm
Sebastien Jodogne <s.jodogne@gmail.com>
parents:
diff changeset
431 std::sort(verticalSides.begin(), verticalSides.end());
b896f20d24ca added UnionOfRectangles algorithm
Sebastien Jodogne <s.jodogne@gmail.com>
parents:
diff changeset
432
b896f20d24ca added UnionOfRectangles algorithm
Sebastien Jodogne <s.jodogne@gmail.com>
parents:
diff changeset
433
b896f20d24ca added UnionOfRectangles algorithm
Sebastien Jodogne <s.jodogne@gmail.com>
parents:
diff changeset
434 /**
b896f20d24ca added UnionOfRectangles algorithm
Sebastien Jodogne <s.jodogne@gmail.com>
parents:
diff changeset
435 * STEP 4
b896f20d24ca added UnionOfRectangles algorithm
Sebastien Jodogne <s.jodogne@gmail.com>
parents:
diff changeset
436 **/
b896f20d24ca added UnionOfRectangles algorithm
Sebastien Jodogne <s.jodogne@gmail.com>
parents:
diff changeset
437 std::list<Internals::OrientedIntegerLine2D> verticalEdges;
b896f20d24ca added UnionOfRectangles algorithm
Sebastien Jodogne <s.jodogne@gmail.com>
parents:
diff changeset
438 std::stack<size_t> stack;
b896f20d24ca added UnionOfRectangles algorithm
Sebastien Jodogne <s.jodogne@gmail.com>
parents:
diff changeset
439
b896f20d24ca added UnionOfRectangles algorithm
Sebastien Jodogne <s.jodogne@gmail.com>
parents:
diff changeset
440 for (size_t i = 0; i < verticalSides.size(); i++)
b896f20d24ca added UnionOfRectangles algorithm
Sebastien Jodogne <s.jodogne@gmail.com>
parents:
diff changeset
441 {
b896f20d24ca added UnionOfRectangles algorithm
Sebastien Jodogne <s.jodogne@gmail.com>
parents:
diff changeset
442 if (i > 0 &&
b896f20d24ca added UnionOfRectangles algorithm
Sebastien Jodogne <s.jodogne@gmail.com>
parents:
diff changeset
443 !verticalSides[i].Equals(verticalSides[i - 1]))
b896f20d24ca added UnionOfRectangles algorithm
Sebastien Jodogne <s.jodogne@gmail.com>
parents:
diff changeset
444 {
b896f20d24ca added UnionOfRectangles algorithm
Sebastien Jodogne <s.jodogne@gmail.com>
parents:
diff changeset
445 // Output the stack
b896f20d24ca added UnionOfRectangles algorithm
Sebastien Jodogne <s.jodogne@gmail.com>
parents:
diff changeset
446 AddVerticalEdges(verticalEdges, stack, verticalSides[i - 1].GetX(),
b896f20d24ca added UnionOfRectangles algorithm
Sebastien Jodogne <s.jodogne@gmail.com>
parents:
diff changeset
447 verticalSides[i - 1].IsLeft());
b896f20d24ca added UnionOfRectangles algorithm
Sebastien Jodogne <s.jodogne@gmail.com>
parents:
diff changeset
448 }
b896f20d24ca added UnionOfRectangles algorithm
Sebastien Jodogne <s.jodogne@gmail.com>
parents:
diff changeset
449
b896f20d24ca added UnionOfRectangles algorithm
Sebastien Jodogne <s.jodogne@gmail.com>
parents:
diff changeset
450 size_t y1 = verticalSides[i].GetY1();
b896f20d24ca added UnionOfRectangles algorithm
Sebastien Jodogne <s.jodogne@gmail.com>
parents:
diff changeset
451 size_t y2 = verticalSides[i].GetY2();
b896f20d24ca added UnionOfRectangles algorithm
Sebastien Jodogne <s.jodogne@gmail.com>
parents:
diff changeset
452
b896f20d24ca added UnionOfRectangles algorithm
Sebastien Jodogne <s.jodogne@gmail.com>
parents:
diff changeset
453 if (verticalSides[i].IsLeft())
b896f20d24ca added UnionOfRectangles algorithm
Sebastien Jodogne <s.jodogne@gmail.com>
parents:
diff changeset
454 {
b896f20d24ca added UnionOfRectangles algorithm
Sebastien Jodogne <s.jodogne@gmail.com>
parents:
diff changeset
455 Visitor::IntersectComplement(stack, y1, y2, tree);
b896f20d24ca added UnionOfRectangles algorithm
Sebastien Jodogne <s.jodogne@gmail.com>
parents:
diff changeset
456
b896f20d24ca added UnionOfRectangles algorithm
Sebastien Jodogne <s.jodogne@gmail.com>
parents:
diff changeset
457 Visitor visitor(Operation_Insert);
b896f20d24ca added UnionOfRectangles algorithm
Sebastien Jodogne <s.jodogne@gmail.com>
parents:
diff changeset
458 tree.VisitSegment(y1, y2, visitor);
b896f20d24ca added UnionOfRectangles algorithm
Sebastien Jodogne <s.jodogne@gmail.com>
parents:
diff changeset
459 }
b896f20d24ca added UnionOfRectangles algorithm
Sebastien Jodogne <s.jodogne@gmail.com>
parents:
diff changeset
460 else
b896f20d24ca added UnionOfRectangles algorithm
Sebastien Jodogne <s.jodogne@gmail.com>
parents:
diff changeset
461 {
b896f20d24ca added UnionOfRectangles algorithm
Sebastien Jodogne <s.jodogne@gmail.com>
parents:
diff changeset
462 Visitor visitor(Operation_Delete);
b896f20d24ca added UnionOfRectangles algorithm
Sebastien Jodogne <s.jodogne@gmail.com>
parents:
diff changeset
463 tree.VisitSegment(y1, y2, visitor);
b896f20d24ca added UnionOfRectangles algorithm
Sebastien Jodogne <s.jodogne@gmail.com>
parents:
diff changeset
464
b896f20d24ca added UnionOfRectangles algorithm
Sebastien Jodogne <s.jodogne@gmail.com>
parents:
diff changeset
465 Visitor::IntersectComplement(stack, y1, y2, tree);
b896f20d24ca added UnionOfRectangles algorithm
Sebastien Jodogne <s.jodogne@gmail.com>
parents:
diff changeset
466 }
b896f20d24ca added UnionOfRectangles algorithm
Sebastien Jodogne <s.jodogne@gmail.com>
parents:
diff changeset
467 }
b896f20d24ca added UnionOfRectangles algorithm
Sebastien Jodogne <s.jodogne@gmail.com>
parents:
diff changeset
468
b896f20d24ca added UnionOfRectangles algorithm
Sebastien Jodogne <s.jodogne@gmail.com>
parents:
diff changeset
469 if (!verticalSides.empty() &&
b896f20d24ca added UnionOfRectangles algorithm
Sebastien Jodogne <s.jodogne@gmail.com>
parents:
diff changeset
470 !stack.empty())
b896f20d24ca added UnionOfRectangles algorithm
Sebastien Jodogne <s.jodogne@gmail.com>
parents:
diff changeset
471 {
b896f20d24ca added UnionOfRectangles algorithm
Sebastien Jodogne <s.jodogne@gmail.com>
parents:
diff changeset
472 AddVerticalEdges(verticalEdges, stack, verticalSides.back().GetX(),
b896f20d24ca added UnionOfRectangles algorithm
Sebastien Jodogne <s.jodogne@gmail.com>
parents:
diff changeset
473 verticalSides.back().IsLeft());
b896f20d24ca added UnionOfRectangles algorithm
Sebastien Jodogne <s.jodogne@gmail.com>
parents:
diff changeset
474 }
b896f20d24ca added UnionOfRectangles algorithm
Sebastien Jodogne <s.jodogne@gmail.com>
parents:
diff changeset
475
b896f20d24ca added UnionOfRectangles algorithm
Sebastien Jodogne <s.jodogne@gmail.com>
parents:
diff changeset
476
b896f20d24ca added UnionOfRectangles algorithm
Sebastien Jodogne <s.jodogne@gmail.com>
parents:
diff changeset
477 /**
b896f20d24ca added UnionOfRectangles algorithm
Sebastien Jodogne <s.jodogne@gmail.com>
parents:
diff changeset
478 * STEP 5: Horizontal edges
b896f20d24ca added UnionOfRectangles algorithm
Sebastien Jodogne <s.jodogne@gmail.com>
parents:
diff changeset
479 **/
b896f20d24ca added UnionOfRectangles algorithm
Sebastien Jodogne <s.jodogne@gmail.com>
parents:
diff changeset
480 std::vector<HorizontalJunction> horizontalJunctions;
b896f20d24ca added UnionOfRectangles algorithm
Sebastien Jodogne <s.jodogne@gmail.com>
parents:
diff changeset
481 horizontalJunctions.reserve(2 * verticalEdges.size());
b896f20d24ca added UnionOfRectangles algorithm
Sebastien Jodogne <s.jodogne@gmail.com>
parents:
diff changeset
482
b896f20d24ca added UnionOfRectangles algorithm
Sebastien Jodogne <s.jodogne@gmail.com>
parents:
diff changeset
483 for (std::list<Internals::OrientedIntegerLine2D>::const_iterator
1878
c9ccd13c6a3c cppcheck
Sebastien Jodogne <s.jodogne@gmail.com>
parents: 1876
diff changeset
484 it = verticalEdges.begin(); it != verticalEdges.end(); ++it)
1875
b896f20d24ca added UnionOfRectangles algorithm
Sebastien Jodogne <s.jodogne@gmail.com>
parents:
diff changeset
485 {
b896f20d24ca added UnionOfRectangles algorithm
Sebastien Jodogne <s.jodogne@gmail.com>
parents:
diff changeset
486 assert(it->GetX1() == it->GetX2());
b896f20d24ca added UnionOfRectangles algorithm
Sebastien Jodogne <s.jodogne@gmail.com>
parents:
diff changeset
487 horizontalJunctions.push_back(HorizontalJunction(it->GetX1(), it->GetY1(), it->GetY2(), it->IsDownward()));
b896f20d24ca added UnionOfRectangles algorithm
Sebastien Jodogne <s.jodogne@gmail.com>
parents:
diff changeset
488 horizontalJunctions.push_back(HorizontalJunction(it->GetX1(), it->GetY2(), it->GetY1(), it->IsDownward()));
b896f20d24ca added UnionOfRectangles algorithm
Sebastien Jodogne <s.jodogne@gmail.com>
parents:
diff changeset
489 }
b896f20d24ca added UnionOfRectangles algorithm
Sebastien Jodogne <s.jodogne@gmail.com>
parents:
diff changeset
490
b896f20d24ca added UnionOfRectangles algorithm
Sebastien Jodogne <s.jodogne@gmail.com>
parents:
diff changeset
491 assert(horizontalJunctions.size() == 2 * verticalEdges.size());
b896f20d24ca added UnionOfRectangles algorithm
Sebastien Jodogne <s.jodogne@gmail.com>
parents:
diff changeset
492 std::sort(horizontalJunctions.begin(), horizontalJunctions.end());
b896f20d24ca added UnionOfRectangles algorithm
Sebastien Jodogne <s.jodogne@gmail.com>
parents:
diff changeset
493
b896f20d24ca added UnionOfRectangles algorithm
Sebastien Jodogne <s.jodogne@gmail.com>
parents:
diff changeset
494 std::list<Internals::OrientedIntegerLine2D> horizontalEdges;
b896f20d24ca added UnionOfRectangles algorithm
Sebastien Jodogne <s.jodogne@gmail.com>
parents:
diff changeset
495 for (size_t i = 0; i < horizontalJunctions.size(); i += 2)
b896f20d24ca added UnionOfRectangles algorithm
Sebastien Jodogne <s.jodogne@gmail.com>
parents:
diff changeset
496 {
b896f20d24ca added UnionOfRectangles algorithm
Sebastien Jodogne <s.jodogne@gmail.com>
parents:
diff changeset
497 size_t x1 = horizontalJunctions[i].GetX();
b896f20d24ca added UnionOfRectangles algorithm
Sebastien Jodogne <s.jodogne@gmail.com>
parents:
diff changeset
498 size_t x2 = horizontalJunctions[i + 1].GetX();
b896f20d24ca added UnionOfRectangles algorithm
Sebastien Jodogne <s.jodogne@gmail.com>
parents:
diff changeset
499 size_t y = horizontalJunctions[i].GetY();
b896f20d24ca added UnionOfRectangles algorithm
Sebastien Jodogne <s.jodogne@gmail.com>
parents:
diff changeset
500
b896f20d24ca added UnionOfRectangles algorithm
Sebastien Jodogne <s.jodogne@gmail.com>
parents:
diff changeset
501 if ((horizontalJunctions[i].IsDownward() && y > horizontalJunctions[i].GetYBis()) ||
b896f20d24ca added UnionOfRectangles algorithm
Sebastien Jodogne <s.jodogne@gmail.com>
parents:
diff changeset
502 (!horizontalJunctions[i].IsDownward() && y < horizontalJunctions[i].GetYBis()))
b896f20d24ca added UnionOfRectangles algorithm
Sebastien Jodogne <s.jodogne@gmail.com>
parents:
diff changeset
503 {
b896f20d24ca added UnionOfRectangles algorithm
Sebastien Jodogne <s.jodogne@gmail.com>
parents:
diff changeset
504 horizontalEdges.push_back(Internals::OrientedIntegerLine2D(x1, y, x2, y));
b896f20d24ca added UnionOfRectangles algorithm
Sebastien Jodogne <s.jodogne@gmail.com>
parents:
diff changeset
505 }
b896f20d24ca added UnionOfRectangles algorithm
Sebastien Jodogne <s.jodogne@gmail.com>
parents:
diff changeset
506 else
b896f20d24ca added UnionOfRectangles algorithm
Sebastien Jodogne <s.jodogne@gmail.com>
parents:
diff changeset
507 {
b896f20d24ca added UnionOfRectangles algorithm
Sebastien Jodogne <s.jodogne@gmail.com>
parents:
diff changeset
508 horizontalEdges.push_back(Internals::OrientedIntegerLine2D(x2, y, x1, y));
b896f20d24ca added UnionOfRectangles algorithm
Sebastien Jodogne <s.jodogne@gmail.com>
parents:
diff changeset
509 }
b896f20d24ca added UnionOfRectangles algorithm
Sebastien Jodogne <s.jodogne@gmail.com>
parents:
diff changeset
510 }
b896f20d24ca added UnionOfRectangles algorithm
Sebastien Jodogne <s.jodogne@gmail.com>
parents:
diff changeset
511
b896f20d24ca added UnionOfRectangles algorithm
Sebastien Jodogne <s.jodogne@gmail.com>
parents:
diff changeset
512
b896f20d24ca added UnionOfRectangles algorithm
Sebastien Jodogne <s.jodogne@gmail.com>
parents:
diff changeset
513 /**
b896f20d24ca added UnionOfRectangles algorithm
Sebastien Jodogne <s.jodogne@gmail.com>
parents:
diff changeset
514 * POST-PROCESSING: Combine the separate sets of horizontal and
b896f20d24ca added UnionOfRectangles algorithm
Sebastien Jodogne <s.jodogne@gmail.com>
parents:
diff changeset
515 * vertical edges, into a set of 2D chains
b896f20d24ca added UnionOfRectangles algorithm
Sebastien Jodogne <s.jodogne@gmail.com>
parents:
diff changeset
516 **/
b896f20d24ca added UnionOfRectangles algorithm
Sebastien Jodogne <s.jodogne@gmail.com>
parents:
diff changeset
517 std::vector<Internals::OrientedIntegerLine2D> allEdges;
b896f20d24ca added UnionOfRectangles algorithm
Sebastien Jodogne <s.jodogne@gmail.com>
parents:
diff changeset
518 allEdges.reserve(horizontalEdges.size() + verticalEdges.size());
b896f20d24ca added UnionOfRectangles algorithm
Sebastien Jodogne <s.jodogne@gmail.com>
parents:
diff changeset
519
b896f20d24ca added UnionOfRectangles algorithm
Sebastien Jodogne <s.jodogne@gmail.com>
parents:
diff changeset
520 for (std::list<Internals::OrientedIntegerLine2D>::const_iterator
1878
c9ccd13c6a3c cppcheck
Sebastien Jodogne <s.jodogne@gmail.com>
parents: 1876
diff changeset
521 it = horizontalEdges.begin(); it != horizontalEdges.end(); ++it)
1875
b896f20d24ca added UnionOfRectangles algorithm
Sebastien Jodogne <s.jodogne@gmail.com>
parents:
diff changeset
522 {
b896f20d24ca added UnionOfRectangles algorithm
Sebastien Jodogne <s.jodogne@gmail.com>
parents:
diff changeset
523 allEdges.push_back(*it);
b896f20d24ca added UnionOfRectangles algorithm
Sebastien Jodogne <s.jodogne@gmail.com>
parents:
diff changeset
524 }
b896f20d24ca added UnionOfRectangles algorithm
Sebastien Jodogne <s.jodogne@gmail.com>
parents:
diff changeset
525
b896f20d24ca added UnionOfRectangles algorithm
Sebastien Jodogne <s.jodogne@gmail.com>
parents:
diff changeset
526 for (std::list<Internals::OrientedIntegerLine2D>::const_iterator
1878
c9ccd13c6a3c cppcheck
Sebastien Jodogne <s.jodogne@gmail.com>
parents: 1876
diff changeset
527 it = verticalEdges.begin(); it != verticalEdges.end(); ++it)
1875
b896f20d24ca added UnionOfRectangles algorithm
Sebastien Jodogne <s.jodogne@gmail.com>
parents:
diff changeset
528 {
b896f20d24ca added UnionOfRectangles algorithm
Sebastien Jodogne <s.jodogne@gmail.com>
parents:
diff changeset
529 allEdges.push_back(*it);
b896f20d24ca added UnionOfRectangles algorithm
Sebastien Jodogne <s.jodogne@gmail.com>
parents:
diff changeset
530 }
b896f20d24ca added UnionOfRectangles algorithm
Sebastien Jodogne <s.jodogne@gmail.com>
parents:
diff changeset
531
b896f20d24ca added UnionOfRectangles algorithm
Sebastien Jodogne <s.jodogne@gmail.com>
parents:
diff changeset
532 assert(allEdges.size() == horizontalEdges.size() + verticalEdges.size());
b896f20d24ca added UnionOfRectangles algorithm
Sebastien Jodogne <s.jodogne@gmail.com>
parents:
diff changeset
533
b896f20d24ca added UnionOfRectangles algorithm
Sebastien Jodogne <s.jodogne@gmail.com>
parents:
diff changeset
534 std::list<Internals::OrientedIntegerLine2D::Chain> chains;
b896f20d24ca added UnionOfRectangles algorithm
Sebastien Jodogne <s.jodogne@gmail.com>
parents:
diff changeset
535 Internals::OrientedIntegerLine2D::ExtractChains(chains, allEdges);
b896f20d24ca added UnionOfRectangles algorithm
Sebastien Jodogne <s.jodogne@gmail.com>
parents:
diff changeset
536
b896f20d24ca added UnionOfRectangles algorithm
Sebastien Jodogne <s.jodogne@gmail.com>
parents:
diff changeset
537 for (std::list<Internals::OrientedIntegerLine2D::Chain>::const_iterator
b896f20d24ca added UnionOfRectangles algorithm
Sebastien Jodogne <s.jodogne@gmail.com>
parents:
diff changeset
538 it = chains.begin(); it != chains.end(); ++it)
b896f20d24ca added UnionOfRectangles algorithm
Sebastien Jodogne <s.jodogne@gmail.com>
parents:
diff changeset
539 {
b896f20d24ca added UnionOfRectangles algorithm
Sebastien Jodogne <s.jodogne@gmail.com>
parents:
diff changeset
540 assert(!it->empty());
b896f20d24ca added UnionOfRectangles algorithm
Sebastien Jodogne <s.jodogne@gmail.com>
parents:
diff changeset
541
b896f20d24ca added UnionOfRectangles algorithm
Sebastien Jodogne <s.jodogne@gmail.com>
parents:
diff changeset
542 std::vector<ScenePoint2D> chain;
b896f20d24ca added UnionOfRectangles algorithm
Sebastien Jodogne <s.jodogne@gmail.com>
parents:
diff changeset
543 chain.reserve(it->size());
b896f20d24ca added UnionOfRectangles algorithm
Sebastien Jodogne <s.jodogne@gmail.com>
parents:
diff changeset
544
b896f20d24ca added UnionOfRectangles algorithm
Sebastien Jodogne <s.jodogne@gmail.com>
parents:
diff changeset
545 for (Internals::OrientedIntegerLine2D::Chain::const_iterator
b896f20d24ca added UnionOfRectangles algorithm
Sebastien Jodogne <s.jodogne@gmail.com>
parents:
diff changeset
546 it2 = it->begin(); it2 != it->end(); ++it2)
b896f20d24ca added UnionOfRectangles algorithm
Sebastien Jodogne <s.jodogne@gmail.com>
parents:
diff changeset
547 {
b896f20d24ca added UnionOfRectangles algorithm
Sebastien Jodogne <s.jodogne@gmail.com>
parents:
diff changeset
548 chain.push_back(ScenePoint2D(horizontalProjection.GetEndpointCoordinate(it2->first),
b896f20d24ca added UnionOfRectangles algorithm
Sebastien Jodogne <s.jodogne@gmail.com>
parents:
diff changeset
549 verticalProjection.GetEndpointCoordinate(it2->second)));
b896f20d24ca added UnionOfRectangles algorithm
Sebastien Jodogne <s.jodogne@gmail.com>
parents:
diff changeset
550 }
b896f20d24ca added UnionOfRectangles algorithm
Sebastien Jodogne <s.jodogne@gmail.com>
parents:
diff changeset
551
b896f20d24ca added UnionOfRectangles algorithm
Sebastien Jodogne <s.jodogne@gmail.com>
parents:
diff changeset
552 assert(!chain.empty());
b896f20d24ca added UnionOfRectangles algorithm
Sebastien Jodogne <s.jodogne@gmail.com>
parents:
diff changeset
553 contours.push_back(chain);
b896f20d24ca added UnionOfRectangles algorithm
Sebastien Jodogne <s.jodogne@gmail.com>
parents:
diff changeset
554 }
b896f20d24ca added UnionOfRectangles algorithm
Sebastien Jodogne <s.jodogne@gmail.com>
parents:
diff changeset
555 }
b896f20d24ca added UnionOfRectangles algorithm
Sebastien Jodogne <s.jodogne@gmail.com>
parents:
diff changeset
556 }