--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/OrthancStone/Resources/Graveyard/RTStructTentativeReimplementation-BGO/DicomStructureSetUtils.cpp	Tue Feb 01 08:38:32 2022 +0100
@@ -0,0 +1,274 @@
+/**
+ * Stone of Orthanc
+ * Copyright (C) 2012-2016 Sebastien Jodogne, Medical Physics
+ * Department, University Hospital of Liege, Belgium
+ * Copyright (C) 2017-2022 Osimis S.A., Belgium
+ * Copyright (C) 2021-2022 Sebastien Jodogne, ICTEAM UCLouvain, Belgium
+ *
+ * This program is free software: you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public License
+ * as published by the Free Software Foundation, either version 3 of
+ * the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this program. If not, see
+ * <http://www.gnu.org/licenses/>.
+ **/
+
+#include "DicomStructureSetUtils.h"
+
+namespace OrthancStone
+{
+
+#if 0
+  void DicomStructure2::PartitionRectangleList(std::vector< std::vector<size_t> > & sets, const std::vector<RtStructRectanglesInSlab> slabCuts)
+  {
+    // map position ( <slabIndex,rectIndex> )--> disjoint set index
+    std::map<std::pair<size_t, size_t>, size_t> posToIndex;
+
+    // disjoint set index --> position
+    std::map<size_t, std::pair<size_t, size_t> > indexToPos;
+
+    size_t nextIndex = 0;
+    for (size_t i = 0; i < slabCuts.size(); ++i)
+    {
+      for (size_t j = 0; j < slabCuts[i].size(); ++j)
+      {
+        std::pair<size_t, size_t> pos(i, j);
+        posToIndex<pos> = nextIndex;
+        indexToPos<nextIndex> = pos;
+      }
+    }
+    // nextIndex is now the total rectangle count
+    DisjointDataSet ds(nextIndex);
+
+    // we loop on all slabs (except the last one) and we connect all rectangles
+    if (slabCuts.size() < 2)
+    {
+#error write special case
+    }
+    else
+    {
+      for (size_t i = 0; i < slabCuts.size() - 1; ++i)
+      {
+        for (size_t j = 0; j < slabCuts[i].size(); ++j)
+        {
+          const RtStructRectangleInSlab& r1 = slabCuts[i][j];
+          const size_t r1i = posToIndex(std::pair<size_t, size_t>(i, j));
+          for (size_t k = 0; k < slabCuts[i + 1].size(); ++k)
+          {
+            const RtStructRectangleInSlab& r2 = slabCuts[i + 1][k];
+            const size_t r2i = posToIndex(std::pair<size_t, size_t>(i, j));
+            // rect.xmin <= rectBottom.xmax && rectBottom.xmin <= rect.xmax
+            if ((r1.xmin <= r2.xmax) && (r2.xmin <= r1.xmax))
+            {
+#error now go!
+            }
+
+          }
+        }
+      }
+    }
+#endif
+
+    /*
+
+      compute list of segments :
+
+      numberOfRectsFromHereOn = 0
+      possibleNext = {in_k,in_kplus1}
+
+      for all boundaries:
+        - we create a vertical segment and we push it
+        - if boundary is a start, numberOfRectsFromHereOn += 1.
+          - if we switch from 0 to 1, we start a segment
+          - if we switch from 1 to 2, we end the current segment and we record it
+        - if boundary is an end, numberOfRectsFromHereOn -= 1.
+          - if we switch from 1 to 0, we end the current segment and we record it
+          - if we switch from 2 to 1, we start a segment
+    */
+
+    // static
+    void AddSlabBoundaries(
+      std::vector<std::pair<double, RectangleBoundaryKind> > & boundaries,
+      const std::vector<RtStructRectanglesInSlab> & slabCuts, size_t iSlab)
+    {
+      if (iSlab < slabCuts.size())
+      {
+        const RtStructRectanglesInSlab& slab = slabCuts[iSlab];
+        for (size_t iRect = 0; iRect < slab.size(); ++iRect)
+        {
+          const RtStructRectangleInSlab& rect = slab[iRect];
+          {
+            std::pair<double, RectangleBoundaryKind> boundary(rect.xmin, RectangleBoundaryKind_Start);
+            boundaries.insert(std::lower_bound(boundaries.begin(), boundaries.end(), boundary), boundary);
+          }
+          {
+            std::pair<double, RectangleBoundaryKind> boundary(rect.xmax, RectangleBoundaryKind_End);
+            boundaries.insert(std::lower_bound(boundaries.begin(), boundaries.end(), boundary), boundary);
+          }
+        }
+      }
+    }
+
+    // static
+    void ProcessBoundaryList(
+      std::vector< std::pair<ScenePoint2D, ScenePoint2D> > & segments,
+      const std::vector<std::pair<double, RectangleBoundaryKind> > & boundaries,
+      double y)
+    {
+      ScenePoint2D start;
+      ScenePoint2D end;
+      int curNumberOfSegments = 0; // we count the number of segments. we only draw if it is 1 (not 0 or 2)
+      for (size_t i = 0; i < boundaries.size(); ++i)
+      {
+        switch (boundaries[i].second)
+        {
+        case RectangleBoundaryKind_Start:
+          curNumberOfSegments += 1;
+          switch (curNumberOfSegments)
+          {
+          case 0:
+            assert(false);
+            break;
+          case 1:
+            // a new segment has begun!
+            start = ScenePoint2D(boundaries[i].first, y);
+            break;
+          case 2:
+            // an extra segment has begun : stop the current one (we don't draw overlaps)
+            end = ScenePoint2D(boundaries[i].first, y);
+            segments.push_back(std::pair<ScenePoint2D, ScenePoint2D>(start, end));
+            break;
+          default:
+            //assert(false); // seen IRL ! 
+            break;
+          }
+          break;
+        case RectangleBoundaryKind_End:
+          curNumberOfSegments -= 1;
+          switch (curNumberOfSegments)
+          {
+          case 0:
+            // a lone (thus active) segment has ended.
+            end = ScenePoint2D(boundaries[i].first, y);
+            segments.push_back(std::pair<ScenePoint2D, ScenePoint2D>(start, end));
+            break;
+          case 1:
+            // an extra segment has ended : start a new one one
+            start = ScenePoint2D(boundaries[i].first, y);
+            break;
+          default:
+            // this should not happen!
+            //assert(false);
+            break;
+          }
+          break;
+        default:
+          assert(false);
+          break;
+        }
+      }
+    }
+
+#if 0
+    void ConvertListOfSlabsToSegments(
+      std::vector< std::pair<ScenePoint2D, ScenePoint2D> >& segments,
+      const std::vector<RtStructRectanglesInSlab>& slabCuts,
+      const size_t totalRectCount)
+    {
+#error to delete 
+    }
+#else
+    // See https://www.dropbox.com/s/bllco6q8aazxk44/2019-09-18-rtstruct-cut-algorithm-rect-merge.png
+    void ConvertListOfSlabsToSegments(
+      std::vector< std::pair<ScenePoint2D, ScenePoint2D> > & segments,
+      const std::vector<RtStructRectanglesInSlab> & slabCuts,
+      const size_t totalRectCount)
+    {
+      if (slabCuts.size() == 0)
+        return;
+
+      if (totalRectCount > 0)
+        segments.reserve(4 * totalRectCount); // worst case, but common.
+
+      /*
+      VERTICAL
+      */
+      for (size_t iSlab = 0; iSlab < slabCuts.size(); ++iSlab)
+      {
+        for (size_t iRect = 0; iRect < slabCuts[iSlab].size(); ++iRect)
+        {
+          const RtStructRectangleInSlab& rect = slabCuts[iSlab][iRect];
+          {
+            ScenePoint2D p1(rect.xmin, rect.ymin);
+            ScenePoint2D p2(rect.xmin, rect.ymax);
+            segments.push_back(std::pair<ScenePoint2D, ScenePoint2D>(p1, p2));
+          }
+          {
+            ScenePoint2D p1(rect.xmax, rect.ymin);
+            ScenePoint2D p2(rect.xmax, rect.ymax);
+            segments.push_back(std::pair<ScenePoint2D, ScenePoint2D>(p1, p2));
+          }
+        }
+      }
+
+      /*
+      HORIZONTAL
+      */
+
+      // if we have N slabs, we have N+1 potential vertical positions for horizontal segments
+      // - one for top of slab 0
+      // - N-1 for all positions between two slabs
+      // - one for bottom of slab N-1
+
+      // this adds all the horizontal segments for the tops of 3the rectangles
+      // in row 0
+      if (slabCuts[0].size() > 0)
+      {
+        std::vector<std::pair<double, RectangleBoundaryKind> > boundaries;
+        AddSlabBoundaries(boundaries, slabCuts, 0);
+
+        ProcessBoundaryList(segments, boundaries, slabCuts[0][0].ymin);
+      }
+
+      // this adds all the horizontal segments belonging to two slabs
+      for (size_t iSlab = 0; iSlab < slabCuts.size() - 1; ++iSlab)
+      {
+        std::vector<std::pair<double, RectangleBoundaryKind> > boundaries;
+        AddSlabBoundaries(boundaries, slabCuts, iSlab);
+        AddSlabBoundaries(boundaries, slabCuts, iSlab + 1);
+        double curY = 0;
+        if (slabCuts[iSlab].size() > 0)
+        {
+          curY = slabCuts[iSlab][0].ymax;
+          ProcessBoundaryList(segments, boundaries, curY);
+        }
+        else if (slabCuts[iSlab + 1].size() > 0)
+        {
+          curY = slabCuts[iSlab + 1][0].ymin;
+          ProcessBoundaryList(segments, boundaries, curY);
+        }
+        else
+        {
+          // nothing to do!! : both slab lists are empty!
+        }
+      }
+
+      // this adds all the horizontal segments for the BOTTOM of the rectangles
+      // on last row 
+      if (slabCuts[slabCuts.size() - 1].size() > 0)
+      {
+        std::vector<std::pair<double, RectangleBoundaryKind> > boundaries;
+        AddSlabBoundaries(boundaries, slabCuts, slabCuts.size() - 1);
+
+        ProcessBoundaryList(segments, boundaries, slabCuts[slabCuts.size() - 1][0].ymax);
+      }
+    }
+#endif
+  }