--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/Framework/Radiography/RadiographyLayerResizeTracker.cpp	Tue Nov 13 10:36:53 2018 +0100
@@ -0,0 +1,187 @@
+/**
+ * Stone of Orthanc
+ * Copyright (C) 2012-2016 Sebastien Jodogne, Medical Physics
+ * Department, University Hospital of Liege, Belgium
+ * Copyright (C) 2017-2018 Osimis S.A., Belgium
+ *
+ * This program is free software: you can redistribute it and/or
+ * modify it under the terms of the GNU Affero 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
+ * Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ **/
+
+
+#include "RadiographyLayerResizeTracker.h"
+
+#include "RadiographySceneCommand.h"
+
+#include <Core/OrthancException.h>
+
+#include <boost/math/special_functions/round.hpp>
+
+
+namespace OrthancStone
+{
+  static double ComputeDistance(double x1,
+                                double y1,
+                                double x2,
+                                double y2)
+  {
+    double dx = x1 - x2;
+    double dy = y1 - y2;
+    return sqrt(dx * dx + dy * dy);
+  }
+      
+
+  class RadiographyLayerResizeTracker::UndoRedoCommand : public RadiographySceneCommand
+  {
+  private:
+    double   sourceSpacingX_;
+    double   sourceSpacingY_;
+    double   sourcePanX_;
+    double   sourcePanY_;
+    double   targetSpacingX_;
+    double   targetSpacingY_;
+    double   targetPanX_;
+    double   targetPanY_;
+
+  protected:
+    virtual void UndoInternal(RadiographyLayer& layer) const
+    {
+      layer.SetPixelSpacing(sourceSpacingX_, sourceSpacingY_);
+      layer.SetPan(sourcePanX_, sourcePanY_);
+    }
+
+    virtual void RedoInternal(RadiographyLayer& layer) const
+    {
+      layer.SetPixelSpacing(targetSpacingX_, targetSpacingY_);
+      layer.SetPan(targetPanX_, targetPanY_);
+    }
+
+  public:
+    UndoRedoCommand(const RadiographyLayerResizeTracker& tracker) :
+      RadiographySceneCommand(tracker.accessor_),
+      sourceSpacingX_(tracker.originalSpacingX_),
+      sourceSpacingY_(tracker.originalSpacingY_),
+      sourcePanX_(tracker.originalPanX_),
+      sourcePanY_(tracker.originalPanY_),
+      targetSpacingX_(tracker.accessor_.GetLayer().GetPixelSpacingX()),
+      targetSpacingY_(tracker.accessor_.GetLayer().GetPixelSpacingY()),
+      targetPanX_(tracker.accessor_.GetLayer().GetPanX()),
+      targetPanY_(tracker.accessor_.GetLayer().GetPanY())
+    {
+    }
+  };
+
+
+  RadiographyLayerResizeTracker::RadiographyLayerResizeTracker(UndoRedoStack& undoRedoStack,
+                                                               RadiographyScene& scene,
+                                                               size_t layer,
+                                                               double x,
+                                                               double y,
+                                                               Corner corner,
+                                                               bool roundScaling) :
+    undoRedoStack_(undoRedoStack),
+    accessor_(scene, layer),
+    roundScaling_(roundScaling)
+  {
+    if (accessor_.IsValid() &&
+        accessor_.GetLayer().IsResizeable())
+    {
+      originalSpacingX_ = accessor_.GetLayer().GetPixelSpacingX();
+      originalSpacingY_ = accessor_.GetLayer().GetPixelSpacingY();
+      originalPanX_ = accessor_.GetLayer().GetPanX();
+      originalPanY_ = accessor_.GetLayer().GetPanY();
+
+      switch (corner)
+      {
+        case Corner_TopLeft:
+          oppositeCorner_ = Corner_BottomRight;
+          break;
+
+        case Corner_TopRight:
+          oppositeCorner_ = Corner_BottomLeft;
+          break;
+
+        case Corner_BottomLeft:
+          oppositeCorner_ = Corner_TopRight;
+          break;
+
+        case Corner_BottomRight:
+          oppositeCorner_ = Corner_TopLeft;
+          break;
+
+        default:
+          throw Orthanc::OrthancException(Orthanc::ErrorCode_InternalError);
+      }
+
+      accessor_.GetLayer().GetCorner(oppositeX_, oppositeY_, oppositeCorner_);
+
+      double d = ComputeDistance(x, y, oppositeX_, oppositeY_);
+      if (d >= std::numeric_limits<float>::epsilon())
+      {
+        baseScaling_ = 1.0 / d;
+      }
+      else
+      {
+        // Avoid division by zero in extreme cases
+        accessor_.Invalidate();
+      }
+    }
+  }
+
+
+  void RadiographyLayerResizeTracker::Render(CairoContext& context,
+                                             double zoom)
+  {
+    throw Orthanc::OrthancException(Orthanc::ErrorCode_InternalError);
+  }
+
+
+  void RadiographyLayerResizeTracker::MouseUp()
+  {
+    if (accessor_.IsValid() &&
+        accessor_.GetLayer().IsResizeable())
+    {
+      undoRedoStack_.Add(new UndoRedoCommand(*this));
+    }
+  }
+
+  
+  void RadiographyLayerResizeTracker::MouseMove(int displayX,
+                                                int displayY,
+                                                double sceneX,
+                                                double sceneY)
+  {
+    static const double ROUND_SCALING = 0.1;
+        
+    if (accessor_.IsValid() &&
+        accessor_.GetLayer().IsResizeable())
+    {
+      double scaling = ComputeDistance(oppositeX_, oppositeY_, sceneX, sceneY) * baseScaling_;
+
+      if (roundScaling_)
+      {
+        scaling = boost::math::round<double>((scaling / ROUND_SCALING) * ROUND_SCALING);
+      }
+          
+      RadiographyLayer& layer = accessor_.GetLayer();
+      layer.SetPixelSpacing(scaling * originalSpacingX_,
+                            scaling * originalSpacingY_);
+
+      // Keep the opposite corner at a fixed location
+      double ox, oy;
+      layer.GetCorner(ox, oy, oppositeCorner_);
+      layer.SetPan(layer.GetPanX() + oppositeX_ - ox,
+                   layer.GetPanY() + oppositeY_ - oy);
+    }
+  }
+}