--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/Framework/Deprecated/Widgets/ZoomMouseTracker.cpp	Tue May 21 14:27:35 2019 +0200
@@ -0,0 +1,110 @@
+/**
+ * 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/>.
+ **/
+
+
+#include "ZoomMouseTracker.h"
+
+#include <Core/Logging.h>
+#include <Core/OrthancException.h>
+
+namespace Deprecated
+{
+  ZoomMouseTracker::ZoomMouseTracker(WorldSceneWidget& that,
+                                     int x,
+                                     int y) :
+    that_(that),
+    originalZoom_(that.GetView().GetZoom()),
+    downX_(x),
+    downY_(y)
+  {
+    that.GetView().MapPixelCenterToScene(centerX_, centerY_, x, y);
+
+    unsigned int height = that.GetView().GetDisplayHeight();
+      
+    if (height <= 3)
+    {
+      idle_ = true;
+      LOG(WARNING) << "image is too small to zoom (current height = " << height << ")";
+    }
+    else
+    {
+      idle_ = false;
+      normalization_ = 1.0 / static_cast<double>(height - 1);
+    }
+  }
+    
+
+  void ZoomMouseTracker::Render(OrthancStone::CairoContext& context,
+                                double zoom)
+  {
+    throw Orthanc::OrthancException(Orthanc::ErrorCode_InternalError);
+  }
+
+
+  void ZoomMouseTracker::MouseMove(int displayX,
+                                   int displayY,
+                                   double x,
+                                   double y,
+                                   const std::vector<Touch>& displayTouches,
+                                   const std::vector<Touch>& sceneTouches)
+  {
+    static const double MIN_ZOOM = -4;
+    static const double MAX_ZOOM = 4;
+
+      
+    if (!idle_)
+    {
+      double dy = static_cast<double>(displayY - downY_) * normalization_;  // In the range [-1,1]
+      double z;
+
+      // Linear interpolation from [-1, 1] to [MIN_ZOOM, MAX_ZOOM]
+      if (dy < -1.0)
+      {
+        z = MIN_ZOOM;
+      }
+      else if (dy > 1.0)
+      {
+        z = MAX_ZOOM;
+      }
+      else
+      {
+        z = MIN_ZOOM + (MAX_ZOOM - MIN_ZOOM) * (dy + 1.0) / 2.0;
+      }
+
+      z = pow(2.0, z);
+
+      ViewportGeometry view = that_.GetView();
+        
+      view.SetZoom(z * originalZoom_);
+        
+      // Correct the pan so that the original click point is kept at
+      // the same location on the display
+      double panX, panY;
+      view.GetPan(panX, panY);
+
+      int tx, ty;
+      view.MapSceneToDisplay(tx, ty, centerX_, centerY_);
+      view.SetPan(panX + static_cast<double>(downX_ - tx),
+                  panY + static_cast<double>(downY_ - ty));
+        
+      that_.SetView(view);
+    }
+  }
+}