--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/Framework/Widgets/PanZoomMouseTracker.h	Thu Jan 24 16:42:27 2019 +0100
@@ -0,0 +1,65 @@
+/**
+ * Stone of Orthanc
+ * Copyright (C) 2012-2016 Sebastien Jodogne, Medical Physics
+ * Department, University Hospital of Liege, Belgium
+ * Copyright (C) 2017-2019 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/>.
+ **/
+
+
+#pragma once
+
+#include "WorldSceneWidget.h"
+
+namespace OrthancStone
+{
+  class PanZoomMouseTracker : public IWorldSceneMouseTracker
+  {
+  private:
+    WorldSceneWidget&  that_;
+    std::vector<Touch> originalSceneTouches_;
+    Touch              originalSceneCenter_;
+    Touch              originalDisplayCenter_;
+    double             originalPanX_;
+    double             originalPanY_;
+    double             originalZoom_;
+    double             originalDisplayDistanceBetweenTouches_;
+    bool               idle_;
+    double             normalization_;
+
+  public:
+    PanZoomMouseTracker(WorldSceneWidget& that,
+                        const std::vector<Touch>& startTouches);
+    
+    virtual bool HasRender() const
+    {
+      return false;
+    }
+
+    virtual void MouseUp()
+    {
+    }
+
+    virtual void Render(CairoContext& context,
+                        double zoom);
+
+    virtual void MouseMove(int displayX,
+                           int displayY,
+                           double x,
+                           double y,
+                           const std::vector<Touch>& displayTouches,
+                           const std::vector<Touch>& sceneTouches);
+  };
+}