# HG changeset patch
# User Sebastien Jodogne <s.jodogne@gmail.com>
# Date 1641932807 -3600
# Node ID b1f510e601d29bd637a9fddccae8cfce2acf6f85
# Parent  b896f20d24cab0737acef138d412f778a5aaffe4
more unit tests

diff -r b896f20d24ca -r b1f510e601d2 OrthancStone/Sources/Toolbox/Internals/OrientedIntegerLine2D.h
--- a/OrthancStone/Sources/Toolbox/Internals/OrientedIntegerLine2D.h	Tue Jan 11 19:59:40 2022 +0100
+++ b/OrthancStone/Sources/Toolbox/Internals/OrientedIntegerLine2D.h	Tue Jan 11 21:26:47 2022 +0100
@@ -23,6 +23,7 @@
 
 #pragma once
 
+#include <stddef.h>  // For size_t
 #include <vector>
 #include <list>
 
diff -r b896f20d24ca -r b1f510e601d2 OrthancStone/Sources/Toolbox/UnionOfRectangles.cpp
--- a/OrthancStone/Sources/Toolbox/UnionOfRectangles.cpp	Tue Jan 11 19:59:40 2022 +0100
+++ b/OrthancStone/Sources/Toolbox/UnionOfRectangles.cpp	Tue Jan 11 21:26:47 2022 +0100
@@ -84,7 +84,7 @@
   class UnionOfRectangles::Factory : public SegmentTree::IPayloadFactory
   {
   public:
-    virtual Orthanc::IDynamicObject* Create()
+    virtual Orthanc::IDynamicObject* Create() ORTHANC_OVERRIDE
     {
       return new Payload;
     }
@@ -103,7 +103,7 @@
     }
   
     virtual void Visit(const SegmentTree& node,
-                       bool fullyInside)
+                       bool fullyInside) ORTHANC_OVERRIDE
     {
       Payload& payload = node.GetTypedPayload<Payload>();
 
@@ -384,6 +384,8 @@
   void UnionOfRectangles::Apply(std::list< std::vector<ScenePoint2D> >& contours,
                                 const std::list<Extent2D>& rectangles)
   {
+    contours.clear();
+
     /**
      * STEP 1
      **/
@@ -392,10 +394,14 @@
 
     assert(horizontalProjection.GetProjectedRectanglesCount() == verticalProjection.GetProjectedRectanglesCount());
 
-    
     /**
      * STEP 2
      **/
+    if (verticalProjection.GetEndpointsCount() == 0)
+    {
+      return;
+    }
+    
     Factory factory;
     SegmentTree tree(0, verticalProjection.GetEndpointsCount() - 1, factory);
 
@@ -528,8 +534,6 @@
     std::list<Internals::OrientedIntegerLine2D::Chain> chains;
     Internals::OrientedIntegerLine2D::ExtractChains(chains, allEdges);
 
-    contours.clear();
-
     for (std::list<Internals::OrientedIntegerLine2D::Chain>::const_iterator
            it = chains.begin(); it != chains.end(); ++it)
     {
diff -r b896f20d24ca -r b1f510e601d2 UnitTestsSources/ComputationalGeometryTests.cpp
--- a/UnitTestsSources/ComputationalGeometryTests.cpp	Tue Jan 11 19:59:40 2022 +0100
+++ b/UnitTestsSources/ComputationalGeometryTests.cpp	Tue Jan 11 21:26:47 2022 +0100
@@ -577,10 +577,70 @@
 #endif
 
 
-TEST(UnionOfRectangles, Complex)
+TEST(UnionOfRectangles, EdgeCases)
 {
   {
     std::list<OrthancStone::Extent2D>  rectangles;
+
+    std::list< std::vector<OrthancStone::ScenePoint2D> > contours;
+    OrthancStone::UnionOfRectangles::Apply(contours, rectangles);
+
+    ASSERT_EQ(0u, contours.size());
+  }
+
+  {
+    std::list<OrthancStone::Extent2D>  rectangles;
+    rectangles.push_back(OrthancStone::Extent2D(3, 3, 4, 3));  // empty rectangle
+
+    std::list< std::vector<OrthancStone::ScenePoint2D> > contours;
+    OrthancStone::UnionOfRectangles::Apply(contours, rectangles);
+
+    ASSERT_EQ(0u, contours.size());
+  }
+
+  {
+    std::list<OrthancStone::Extent2D>  rectangles;
+    rectangles.push_back(OrthancStone::Extent2D(1, 1, 2, 2));
+
+    std::list< std::vector<OrthancStone::ScenePoint2D> > contours;
+    OrthancStone::UnionOfRectangles::Apply(contours, rectangles);
+
+    ASSERT_EQ(1u, contours.size());
+    ASSERT_EQ(5u, contours.front().size());
+    ASSERT_TRUE(contours.front()[0].IsEqual(OrthancStone::ScenePoint2D(1, 2)));
+    ASSERT_TRUE(contours.front()[1].IsEqual(OrthancStone::ScenePoint2D(2, 2)));
+    ASSERT_TRUE(contours.front()[2].IsEqual(OrthancStone::ScenePoint2D(2, 1)));
+    ASSERT_TRUE(contours.front()[3].IsEqual(OrthancStone::ScenePoint2D(1, 1)));
+    ASSERT_TRUE(contours.front()[4].IsEqual(OrthancStone::ScenePoint2D(1, 2)));
+  }
+
+  {
+    std::list<OrthancStone::Extent2D>  rectangles;
+    rectangles.push_back(OrthancStone::Extent2D(1, 1, 2, 2));
+    rectangles.push_back(OrthancStone::Extent2D(1, 3, 2, 4));
+
+    std::list< std::vector<OrthancStone::ScenePoint2D> > contours;
+    OrthancStone::UnionOfRectangles::Apply(contours, rectangles);
+
+    ASSERT_EQ(2u, contours.size());
+
+    ASSERT_EQ(5u, contours.front().size());
+    ASSERT_TRUE(contours.front()[0].IsEqual(OrthancStone::ScenePoint2D(1, 4)));
+    ASSERT_TRUE(contours.front()[1].IsEqual(OrthancStone::ScenePoint2D(2, 4)));
+    ASSERT_TRUE(contours.front()[2].IsEqual(OrthancStone::ScenePoint2D(2, 3)));
+    ASSERT_TRUE(contours.front()[3].IsEqual(OrthancStone::ScenePoint2D(1, 3)));
+    ASSERT_TRUE(contours.front()[4].IsEqual(OrthancStone::ScenePoint2D(1, 4)));
+
+    ASSERT_EQ(5u, contours.back().size());
+    ASSERT_TRUE(contours.back()[0].IsEqual(OrthancStone::ScenePoint2D(1, 2)));
+    ASSERT_TRUE(contours.back()[1].IsEqual(OrthancStone::ScenePoint2D(2, 2)));
+    ASSERT_TRUE(contours.back()[2].IsEqual(OrthancStone::ScenePoint2D(2, 1)));
+    ASSERT_TRUE(contours.back()[3].IsEqual(OrthancStone::ScenePoint2D(1, 1)));
+    ASSERT_TRUE(contours.back()[4].IsEqual(OrthancStone::ScenePoint2D(1, 2)));
+  }
+
+  {
+    std::list<OrthancStone::Extent2D>  rectangles;
     rectangles.push_back(OrthancStone::Extent2D(1, 4, 4, 6));
     rectangles.push_back(OrthancStone::Extent2D(4, 6, 7, 8));
     rectangles.push_back(OrthancStone::Extent2D(4, 2, 7, 4));
@@ -670,7 +730,6 @@
     ASSERT_TRUE(contours.back()[4].IsEqual(OrthancStone::ScenePoint2D(1, 2)));
   }
 
-#if 0
   {
     std::list<OrthancStone::Extent2D>  rectangles;
     rectangles.push_back(OrthancStone::Extent2D(1, 4, 4, 6));
@@ -681,23 +740,235 @@
     std::list< std::vector<OrthancStone::ScenePoint2D> > contours;
     OrthancStone::UnionOfRectangles::Apply(contours, rectangles);
 
-    SaveSvg(contours);
-    
     ASSERT_EQ(1u, contours.size());
     ASSERT_EQ(13u, contours.front().size());
     ASSERT_TRUE(contours.front()[0].IsEqual(OrthancStone::ScenePoint2D(4, 8)));
     ASSERT_TRUE(contours.front()[1].IsEqual(OrthancStone::ScenePoint2D(7, 8)));
     ASSERT_TRUE(contours.front()[2].IsEqual(OrthancStone::ScenePoint2D(7, 6)));
     ASSERT_TRUE(contours.front()[3].IsEqual(OrthancStone::ScenePoint2D(9, 6)));
-    ASSERT_TRUE(contours.front()[4].IsEqual(OrthancStone::ScenePoint2D(7, 6)));
-    ASSERT_TRUE(contours.front()[5].IsEqual(OrthancStone::ScenePoint2D(4, 4)));
-    ASSERT_TRUE(contours.front()[6].IsEqual(OrthancStone::ScenePoint2D(1, 4)));
-    ASSERT_TRUE(contours.front()[7].IsEqual(OrthancStone::ScenePoint2D()));
-    ASSERT_TRUE(contours.front()[8].IsEqual(OrthancStone::ScenePoint2D()));
-    ASSERT_TRUE(contours.front()[9].IsEqual(OrthancStone::ScenePoint2D()));
-    ASSERT_TRUE(contours.front()[10].IsEqual(OrthancStone::ScenePoint2D()));
-    ASSERT_TRUE(contours.front()[11].IsEqual(OrthancStone::ScenePoint2D()));
-    ASSERT_TRUE(contours.front()[12].IsEqual(OrthancStone::ScenePoint2D()));
+    ASSERT_TRUE(contours.front()[4].IsEqual(OrthancStone::ScenePoint2D(9, 4)));
+    ASSERT_TRUE(contours.front()[5].IsEqual(OrthancStone::ScenePoint2D(7, 4)));
+    ASSERT_TRUE(contours.front()[6].IsEqual(OrthancStone::ScenePoint2D(7, 2)));
+    ASSERT_TRUE(contours.front()[7].IsEqual(OrthancStone::ScenePoint2D(4, 2)));
+    ASSERT_TRUE(contours.front()[8].IsEqual(OrthancStone::ScenePoint2D(4, 4)));
+    ASSERT_TRUE(contours.front()[9].IsEqual(OrthancStone::ScenePoint2D(1, 4)));
+    ASSERT_TRUE(contours.front()[10].IsEqual(OrthancStone::ScenePoint2D(1, 6)));
+    ASSERT_TRUE(contours.front()[11].IsEqual(OrthancStone::ScenePoint2D(4, 6)));
+    ASSERT_TRUE(contours.front()[12].IsEqual(OrthancStone::ScenePoint2D(4, 8)));
+  }
+
+  {
+    std::list<OrthancStone::Extent2D>  rectangles;
+    rectangles.push_back(OrthancStone::Extent2D(1, 4, 4, 6));
+    rectangles.push_back(OrthancStone::Extent2D(4, 6, 7, 8));
+    rectangles.push_back(OrthancStone::Extent2D(4, 2, 7, 6));
+
+    std::list< std::vector<OrthancStone::ScenePoint2D> > contours;
+    OrthancStone::UnionOfRectangles::Apply(contours, rectangles);
+
+    ASSERT_EQ(1u, contours.size());
+    ASSERT_EQ(9u, contours.front().size());
+    ASSERT_TRUE(contours.front()[0].IsEqual(OrthancStone::ScenePoint2D(4, 8)));
+    ASSERT_TRUE(contours.front()[1].IsEqual(OrthancStone::ScenePoint2D(7, 8)));
+    ASSERT_TRUE(contours.front()[2].IsEqual(OrthancStone::ScenePoint2D(7, 2)));
+    ASSERT_TRUE(contours.front()[3].IsEqual(OrthancStone::ScenePoint2D(4, 2)));
+    ASSERT_TRUE(contours.front()[4].IsEqual(OrthancStone::ScenePoint2D(4, 4)));
+    ASSERT_TRUE(contours.front()[5].IsEqual(OrthancStone::ScenePoint2D(1, 4)));
+    ASSERT_TRUE(contours.front()[6].IsEqual(OrthancStone::ScenePoint2D(1, 6)));
+    ASSERT_TRUE(contours.front()[7].IsEqual(OrthancStone::ScenePoint2D(4, 6)));
+    ASSERT_TRUE(contours.front()[8].IsEqual(OrthancStone::ScenePoint2D(4, 8)));
+  }
+
+  {
+    std::list<OrthancStone::Extent2D>  rectangles;
+    rectangles.push_back(OrthancStone::Extent2D(2, 2, 4, 4));
+    rectangles.push_back(OrthancStone::Extent2D(3, 3, 5, 5));
+
+    std::list< std::vector<OrthancStone::ScenePoint2D> > contours;
+    OrthancStone::UnionOfRectangles::Apply(contours, rectangles);
+
+    ASSERT_EQ(1u, contours.size());
+    ASSERT_EQ(9u, contours.front().size());
+    ASSERT_TRUE(contours.front()[0].IsEqual(OrthancStone::ScenePoint2D(3, 5)));
+    ASSERT_TRUE(contours.front()[1].IsEqual(OrthancStone::ScenePoint2D(5, 5)));
+    ASSERT_TRUE(contours.front()[2].IsEqual(OrthancStone::ScenePoint2D(5, 3)));
+    ASSERT_TRUE(contours.front()[3].IsEqual(OrthancStone::ScenePoint2D(4, 3)));
+    ASSERT_TRUE(contours.front()[4].IsEqual(OrthancStone::ScenePoint2D(4, 2)));
+    ASSERT_TRUE(contours.front()[5].IsEqual(OrthancStone::ScenePoint2D(2, 2)));
+    ASSERT_TRUE(contours.front()[6].IsEqual(OrthancStone::ScenePoint2D(2, 4)));
+    ASSERT_TRUE(contours.front()[7].IsEqual(OrthancStone::ScenePoint2D(3, 4)));
+    ASSERT_TRUE(contours.front()[8].IsEqual(OrthancStone::ScenePoint2D(3, 5)));
+  }
+
+  {
+    std::list<OrthancStone::Extent2D>  rectangles;
+    rectangles.push_back(OrthancStone::Extent2D(2, 2, 4, 4));
+    rectangles.push_back(OrthancStone::Extent2D(3, 1, 5, 3));
+
+    std::list< std::vector<OrthancStone::ScenePoint2D> > contours;
+    OrthancStone::UnionOfRectangles::Apply(contours, rectangles);
+
+    ASSERT_EQ(1u, contours.size());
+    ASSERT_EQ(9u, contours.front().size());
+    ASSERT_TRUE(contours.front()[0].IsEqual(OrthancStone::ScenePoint2D(2, 4)));
+    ASSERT_TRUE(contours.front()[1].IsEqual(OrthancStone::ScenePoint2D(4, 4)));
+    ASSERT_TRUE(contours.front()[2].IsEqual(OrthancStone::ScenePoint2D(4, 3)));
+    ASSERT_TRUE(contours.front()[3].IsEqual(OrthancStone::ScenePoint2D(5, 3)));
+    ASSERT_TRUE(contours.front()[4].IsEqual(OrthancStone::ScenePoint2D(5, 1)));
+    ASSERT_TRUE(contours.front()[5].IsEqual(OrthancStone::ScenePoint2D(3, 1)));
+    ASSERT_TRUE(contours.front()[6].IsEqual(OrthancStone::ScenePoint2D(3, 2)));
+    ASSERT_TRUE(contours.front()[7].IsEqual(OrthancStone::ScenePoint2D(2, 2)));
+    ASSERT_TRUE(contours.front()[8].IsEqual(OrthancStone::ScenePoint2D(2, 4)));
+  }
+
+  {
+    std::list<OrthancStone::Extent2D>  rectangles;
+    rectangles.push_back(OrthancStone::Extent2D(2, 2, 4, 4));
+    rectangles.push_back(OrthancStone::Extent2D(1, 1, 3, 3));
+
+    std::list< std::vector<OrthancStone::ScenePoint2D> > contours;
+    OrthancStone::UnionOfRectangles::Apply(contours, rectangles);
+
+    ASSERT_EQ(1u, contours.size());
+    ASSERT_EQ(9u, contours.front().size());
+    ASSERT_TRUE(contours.front()[0].IsEqual(OrthancStone::ScenePoint2D(2, 4)));
+    ASSERT_TRUE(contours.front()[1].IsEqual(OrthancStone::ScenePoint2D(4, 4)));
+    ASSERT_TRUE(contours.front()[2].IsEqual(OrthancStone::ScenePoint2D(4, 2)));
+    ASSERT_TRUE(contours.front()[3].IsEqual(OrthancStone::ScenePoint2D(3, 2)));
+    ASSERT_TRUE(contours.front()[4].IsEqual(OrthancStone::ScenePoint2D(3, 1)));
+    ASSERT_TRUE(contours.front()[5].IsEqual(OrthancStone::ScenePoint2D(1, 1)));
+    ASSERT_TRUE(contours.front()[6].IsEqual(OrthancStone::ScenePoint2D(1, 3)));
+    ASSERT_TRUE(contours.front()[7].IsEqual(OrthancStone::ScenePoint2D(2, 3)));
+    ASSERT_TRUE(contours.front()[8].IsEqual(OrthancStone::ScenePoint2D(2, 4)));
   }
-#endif
+
+  {
+    std::list<OrthancStone::Extent2D>  rectangles;
+    rectangles.push_back(OrthancStone::Extent2D(2, 2, 4, 4));
+    rectangles.push_back(OrthancStone::Extent2D(1, 3, 3, 5));
+
+    std::list< std::vector<OrthancStone::ScenePoint2D> > contours;
+    OrthancStone::UnionOfRectangles::Apply(contours, rectangles);
+
+    ASSERT_EQ(1u, contours.size());
+    ASSERT_EQ(9u, contours.front().size());
+    ASSERT_TRUE(contours.front()[0].IsEqual(OrthancStone::ScenePoint2D(1, 5)));
+    ASSERT_TRUE(contours.front()[1].IsEqual(OrthancStone::ScenePoint2D(3, 5)));
+    ASSERT_TRUE(contours.front()[2].IsEqual(OrthancStone::ScenePoint2D(3, 4)));
+    ASSERT_TRUE(contours.front()[3].IsEqual(OrthancStone::ScenePoint2D(4, 4)));
+    ASSERT_TRUE(contours.front()[4].IsEqual(OrthancStone::ScenePoint2D(4, 2)));
+    ASSERT_TRUE(contours.front()[5].IsEqual(OrthancStone::ScenePoint2D(2, 2)));
+    ASSERT_TRUE(contours.front()[6].IsEqual(OrthancStone::ScenePoint2D(2, 3)));
+    ASSERT_TRUE(contours.front()[7].IsEqual(OrthancStone::ScenePoint2D(1, 3)));
+    ASSERT_TRUE(contours.front()[8].IsEqual(OrthancStone::ScenePoint2D(1, 5)));
+  }
+
+  {
+    std::list<OrthancStone::Extent2D>  rectangles;
+    rectangles.push_back(OrthancStone::Extent2D(2, 2, 3, 3));
+    rectangles.push_back(OrthancStone::Extent2D(3, 1, 4, 2));
+
+    std::list< std::vector<OrthancStone::ScenePoint2D> > contours;
+    OrthancStone::UnionOfRectangles::Apply(contours, rectangles);
+
+    ASSERT_EQ(1u, contours.size());
+    ASSERT_EQ(9u, contours.front().size());
+    ASSERT_TRUE(contours.front()[0].IsEqual(OrthancStone::ScenePoint2D(2, 3)));
+    ASSERT_TRUE(contours.front()[1].IsEqual(OrthancStone::ScenePoint2D(3, 3)));
+    ASSERT_TRUE(contours.front()[2].IsEqual(OrthancStone::ScenePoint2D(3, 2)));
+    ASSERT_TRUE(contours.front()[3].IsEqual(OrthancStone::ScenePoint2D(4, 2)));
+    ASSERT_TRUE(contours.front()[4].IsEqual(OrthancStone::ScenePoint2D(4, 1)));
+    ASSERT_TRUE(contours.front()[5].IsEqual(OrthancStone::ScenePoint2D(3, 1)));
+    ASSERT_TRUE(contours.front()[6].IsEqual(OrthancStone::ScenePoint2D(3, 2)));
+    ASSERT_TRUE(contours.front()[7].IsEqual(OrthancStone::ScenePoint2D(2, 2)));
+    ASSERT_TRUE(contours.front()[8].IsEqual(OrthancStone::ScenePoint2D(2, 3)));
+  }
+
+  {
+    std::list<OrthancStone::Extent2D>  rectangles;
+    rectangles.push_back(OrthancStone::Extent2D(2, 2, 3, 3));
+    rectangles.push_back(OrthancStone::Extent2D(3, 3, 4, 4));
+
+    std::list< std::vector<OrthancStone::ScenePoint2D> > contours;
+    OrthancStone::UnionOfRectangles::Apply(contours, rectangles);
+
+    ASSERT_EQ(1u, contours.size());
+    ASSERT_EQ(9u, contours.front().size());
+    ASSERT_TRUE(contours.front()[0].IsEqual(OrthancStone::ScenePoint2D(3, 4)));
+    ASSERT_TRUE(contours.front()[1].IsEqual(OrthancStone::ScenePoint2D(4, 4)));
+    ASSERT_TRUE(contours.front()[2].IsEqual(OrthancStone::ScenePoint2D(4, 3)));
+    ASSERT_TRUE(contours.front()[3].IsEqual(OrthancStone::ScenePoint2D(3, 3)));
+    ASSERT_TRUE(contours.front()[4].IsEqual(OrthancStone::ScenePoint2D(3, 2)));
+    ASSERT_TRUE(contours.front()[5].IsEqual(OrthancStone::ScenePoint2D(2, 2)));
+    ASSERT_TRUE(contours.front()[6].IsEqual(OrthancStone::ScenePoint2D(2, 3)));
+    ASSERT_TRUE(contours.front()[7].IsEqual(OrthancStone::ScenePoint2D(3, 3)));
+    ASSERT_TRUE(contours.front()[8].IsEqual(OrthancStone::ScenePoint2D(3, 4)));
+  }
+
+  {
+    std::list<OrthancStone::Extent2D>  rectangles;
+    rectangles.push_back(OrthancStone::Extent2D(2, 2, 3, 3));
+    rectangles.push_back(OrthancStone::Extent2D(1, 3, 2, 4));
+
+    std::list< std::vector<OrthancStone::ScenePoint2D> > contours;
+    OrthancStone::UnionOfRectangles::Apply(contours, rectangles);
+
+    ASSERT_EQ(1u, contours.size());
+    ASSERT_EQ(9u, contours.front().size());
+    ASSERT_TRUE(contours.front()[0].IsEqual(OrthancStone::ScenePoint2D(1, 4)));
+    ASSERT_TRUE(contours.front()[1].IsEqual(OrthancStone::ScenePoint2D(2, 4)));
+    ASSERT_TRUE(contours.front()[2].IsEqual(OrthancStone::ScenePoint2D(2, 3)));
+    ASSERT_TRUE(contours.front()[3].IsEqual(OrthancStone::ScenePoint2D(3, 3)));
+    ASSERT_TRUE(contours.front()[4].IsEqual(OrthancStone::ScenePoint2D(3, 2)));
+    ASSERT_TRUE(contours.front()[5].IsEqual(OrthancStone::ScenePoint2D(2, 2)));
+    ASSERT_TRUE(contours.front()[6].IsEqual(OrthancStone::ScenePoint2D(2, 3)));
+    ASSERT_TRUE(contours.front()[7].IsEqual(OrthancStone::ScenePoint2D(1, 3)));
+    ASSERT_TRUE(contours.front()[8].IsEqual(OrthancStone::ScenePoint2D(1, 4)));
+  }
+
+  {
+    std::list<OrthancStone::Extent2D>  rectangles;
+    rectangles.push_back(OrthancStone::Extent2D(2, 2, 3, 3));
+    rectangles.push_back(OrthancStone::Extent2D(1, 1, 2, 2));
+
+    std::list< std::vector<OrthancStone::ScenePoint2D> > contours;
+    OrthancStone::UnionOfRectangles::Apply(contours, rectangles);
+
+    ASSERT_EQ(1u, contours.size());
+    ASSERT_EQ(9u, contours.front().size());
+    ASSERT_TRUE(contours.front()[0].IsEqual(OrthancStone::ScenePoint2D(2, 3)));
+    ASSERT_TRUE(contours.front()[1].IsEqual(OrthancStone::ScenePoint2D(3, 3)));
+    ASSERT_TRUE(contours.front()[2].IsEqual(OrthancStone::ScenePoint2D(3, 2)));
+    ASSERT_TRUE(contours.front()[3].IsEqual(OrthancStone::ScenePoint2D(2, 2)));
+    ASSERT_TRUE(contours.front()[4].IsEqual(OrthancStone::ScenePoint2D(2, 1)));
+    ASSERT_TRUE(contours.front()[5].IsEqual(OrthancStone::ScenePoint2D(1, 1)));
+    ASSERT_TRUE(contours.front()[6].IsEqual(OrthancStone::ScenePoint2D(1, 2)));
+    ASSERT_TRUE(contours.front()[7].IsEqual(OrthancStone::ScenePoint2D(2, 2)));
+    ASSERT_TRUE(contours.front()[8].IsEqual(OrthancStone::ScenePoint2D(2, 3)));
+  }
+
+  {
+    std::list<OrthancStone::Extent2D>  rectangles;
+    rectangles.push_back(OrthancStone::Extent2D(2, 2, 3, 5));
+    rectangles.push_back(OrthancStone::Extent2D(1, 3, 4, 4));
+
+    std::list< std::vector<OrthancStone::ScenePoint2D> > contours;
+    OrthancStone::UnionOfRectangles::Apply(contours, rectangles);
+    
+    ASSERT_EQ(1u, contours.size());
+    ASSERT_EQ(13u, contours.front().size());
+    ASSERT_TRUE(contours.front()[0].IsEqual(OrthancStone::ScenePoint2D(2, 5)));
+    ASSERT_TRUE(contours.front()[1].IsEqual(OrthancStone::ScenePoint2D(3, 5)));
+    ASSERT_TRUE(contours.front()[2].IsEqual(OrthancStone::ScenePoint2D(3, 4)));
+    ASSERT_TRUE(contours.front()[3].IsEqual(OrthancStone::ScenePoint2D(4, 4)));
+    ASSERT_TRUE(contours.front()[4].IsEqual(OrthancStone::ScenePoint2D(4, 3)));
+    ASSERT_TRUE(contours.front()[5].IsEqual(OrthancStone::ScenePoint2D(3, 3)));
+    ASSERT_TRUE(contours.front()[6].IsEqual(OrthancStone::ScenePoint2D(3, 2)));
+    ASSERT_TRUE(contours.front()[7].IsEqual(OrthancStone::ScenePoint2D(2, 2)));
+    ASSERT_TRUE(contours.front()[8].IsEqual(OrthancStone::ScenePoint2D(2, 3)));
+    ASSERT_TRUE(contours.front()[9].IsEqual(OrthancStone::ScenePoint2D(1, 3)));
+    ASSERT_TRUE(contours.front()[10].IsEqual(OrthancStone::ScenePoint2D(1, 4)));
+    ASSERT_TRUE(contours.front()[11].IsEqual(OrthancStone::ScenePoint2D(2, 4)));
+    ASSERT_TRUE(contours.front()[12].IsEqual(OrthancStone::ScenePoint2D(2, 5)));
+  }
 }