--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/Framework/Deprecated/Widgets/PanZoomMouseTracker.cpp	Tue May 21 14:27:35 2019 +0200
@@ -0,0 +1,137 @@
+/**
+ * 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 "PanZoomMouseTracker.h"
+
+#include <Core/Logging.h>
+#include <Core/OrthancException.h>
+#include <math.h>
+
+namespace Deprecated
+{
+  Touch GetCenter(const std::vector<Touch>& touches)
+  {
+    return Touch((touches[0].x + touches[1].x) / 2.0f, (touches[0].y + touches[1].y) / 2.0f);
+  }
+
+  double GetDistance(const std::vector<Touch>& touches)
+  {
+    float dx = touches[0].x - touches[1].x;
+    float dy = touches[0].y - touches[1].y;
+    return sqrt((double)(dx * dx) + (double)(dy * dy));
+  }
+
+
+  PanZoomMouseTracker::PanZoomMouseTracker(WorldSceneWidget& that,
+                                           const std::vector<Touch>& startTouches)
+    : that_(that),
+      originalZoom_(that.GetView().GetZoom())
+  {
+    that.GetView().GetPan(originalPanX_, originalPanY_);
+    that.GetView().MapPixelCenterToScene(originalSceneTouches_, startTouches);
+
+    originalDisplayCenter_ = GetCenter(startTouches);
+    originalSceneCenter_ = GetCenter(originalSceneTouches_);
+    originalDisplayDistanceBetweenTouches_ = GetDistance(startTouches);
+
+//    printf("original Pan %f %f\n", originalPanX_, originalPanY_);
+//    printf("original Zoom %f \n", originalZoom_);
+//    printf("original distance %f \n", (float)originalDisplayDistanceBetweenTouches_);
+//    printf("original display touches 0 %f %f\n", startTouches[0].x, startTouches[0].y);
+//    printf("original display touches 1 %f %f\n", startTouches[1].x, startTouches[1].y);
+//    printf("original Scene center %f %f\n", originalSceneCenter_.x, originalSceneCenter_.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 PanZoomMouseTracker::Render(OrthancStone::CairoContext& context,
+                                   double zoom)
+  {
+    throw Orthanc::OrthancException(Orthanc::ErrorCode_InternalError);
+  }
+
+
+  void PanZoomMouseTracker::MouseMove(int displayX,
+                                      int displayY,
+                                      double x,
+                                      double y,
+                                      const std::vector<Touch>& displayTouches,
+                                      const std::vector<Touch>& sceneTouches)
+  {
+    ViewportGeometry view = that_.GetView();
+
+//    printf("Display touches 0 %f %f\n", displayTouches[0].x, displayTouches[0].y);
+//    printf("Display touches 1 %f %f\n", displayTouches[1].x, displayTouches[1].y);
+//    printf("Scene touches 0 %f %f\n", sceneTouches[0].x, sceneTouches[0].y);
+//    printf("Scene touches 1 %f %f\n", sceneTouches[1].x, sceneTouches[1].y);
+
+//    printf("zoom = %f\n", view.GetZoom());
+    Touch currentSceneCenter = GetCenter(sceneTouches);
+    double panX = originalPanX_ + (currentSceneCenter.x - originalSceneCenter_.x) * view.GetZoom();
+    double panY = originalPanY_ + (currentSceneCenter.y - originalSceneCenter_.y) * view.GetZoom();
+
+    view.SetPan(panX, panY);
+
+    static const double MIN_ZOOM = -4;
+    static const double MAX_ZOOM = 4;
+
+    if (!idle_)
+    {
+      double currentDistanceBetweenTouches = GetDistance(displayTouches);
+
+      double dy = static_cast<double>(currentDistanceBetweenTouches - originalDisplayDistanceBetweenTouches_) * 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);
+
+      view.SetZoom(z * originalZoom_);
+    }
+
+    that_.SetView(view);
+  }
+}