--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/OrthancStone/Sources/Scene2D/ZoomSceneTracker.h	Tue Jul 07 16:21:02 2020 +0200
@@ -0,0 +1,51 @@
+/**
+ * Stone of Orthanc
+ * Copyright (C) 2012-2016 Sebastien Jodogne, Medical Physics
+ * Department, University Hospital of Liege, Belgium
+ * Copyright (C) 2017-2020 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 "../Scene2DViewport/OneGesturePointerTracker.h"
+#include "../Viewport/IViewport.h"
+#include "Internals/FixedPointAligner.h"
+
+#include <boost/weak_ptr.hpp>
+
+namespace OrthancStone
+{
+  class ZoomSceneTracker : public OneGesturePointerTracker
+  {
+  public:
+    ZoomSceneTracker(boost::shared_ptr<IViewport> viewport,
+                     const PointerEvent& event,
+                     unsigned int canvasHeight);
+
+    virtual void PointerMove(const PointerEvent& event) ORTHANC_OVERRIDE;
+    virtual void Cancel() ORTHANC_OVERRIDE;
+  
+  private:
+    double                        clickY_;
+    bool                          active_;
+    double                        normalization_;
+    Internals::FixedPointAligner  aligner_;
+    AffineTransform2D             originalSceneToCanvas_;
+
+  };
+}