--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/Framework/Radiography/RadiographyLayerMoveTracker.cpp	Mon Nov 12 18:00:48 2018 +0100
@@ -0,0 +1,124 @@
+/**
+ * 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 "RadiographyLayerMoveTracker.h"
+
+#include "RadiographySceneCommand.h"
+
+#include <Core/OrthancException.h>
+
+namespace OrthancStone
+{
+  class RadiographyLayerMoveTracker::UndoRedoCommand : public RadiographySceneCommand
+  {
+  private:
+    double  sourceX_;
+    double  sourceY_;
+    double  targetX_;
+    double  targetY_;
+
+  protected:
+    virtual void UndoInternal(RadiographyLayer& layer) const
+    {
+      layer.SetPan(sourceX_, sourceY_);
+    }
+
+    virtual void RedoInternal(RadiographyLayer& layer) const
+    {
+      layer.SetPan(targetX_, targetY_);
+    }
+
+  public:
+    UndoRedoCommand(const RadiographyLayerMoveTracker& tracker) :
+      RadiographySceneCommand(tracker.accessor_),
+      sourceX_(tracker.panX_),
+      sourceY_(tracker.panY_),
+      targetX_(tracker.accessor_.GetLayer().GetPanX()),
+      targetY_(tracker.accessor_.GetLayer().GetPanY())
+    {
+    }
+  };
+
+
+  RadiographyLayerMoveTracker::RadiographyLayerMoveTracker(UndoRedoStack& undoRedoStack,
+                                                           RadiographyScene& scene,
+                                                           size_t layer,
+                                                           double x,
+                                                           double y,
+                                                           bool oneAxis) :
+    undoRedoStack_(undoRedoStack),
+    accessor_(scene, layer),
+    clickX_(x),
+    clickY_(y),
+    oneAxis_(oneAxis)
+  {
+    if (accessor_.IsValid())
+    {
+      panX_ = accessor_.GetLayer().GetPanX();
+      panY_ = accessor_.GetLayer().GetPanY();
+    }
+  }
+
+
+  void RadiographyLayerMoveTracker::Render(CairoContext& context,
+                                           double zoom)
+  {
+    throw Orthanc::OrthancException(Orthanc::ErrorCode_InternalError);
+  }
+
+  
+  void RadiographyLayerMoveTracker::MouseUp()
+  {
+    if (accessor_.IsValid())
+    {
+      undoRedoStack_.Add(new UndoRedoCommand(*this));
+    }
+  }
+
+  
+  void RadiographyLayerMoveTracker::MouseMove(int displayX,
+                                              int displayY,
+                                              double sceneX,
+                                              double sceneY)
+  {
+    if (accessor_.IsValid())
+    {
+      double dx = sceneX - clickX_;
+      double dy = sceneY - clickY_;
+
+      if (oneAxis_)
+      {
+        if (fabs(dx) > fabs(dy))
+        {
+          accessor_.GetLayer().SetPan(dx + panX_, panY_);
+        }
+        else
+        {
+          accessor_.GetLayer().SetPan(panX_, dy + panY_);
+        }
+      }
+      else
+      {
+        accessor_.GetLayer().SetPan(dx + panX_, dy + panY_);
+      }
+    }
+  }
+}