--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/OrthancStone/Sources/Scene2D/MagnifyingGlassTracker.h	Mon Oct 31 22:19:57 2022 +0100
@@ -0,0 +1,56 @@
+/**
+ * Stone of Orthanc
+ * Copyright (C) 2012-2016 Sebastien Jodogne, Medical Physics
+ * Department, University Hospital of Liege, Belgium
+ * Copyright (C) 2017-2022 Osimis S.A., Belgium
+ * Copyright (C) 2021-2022 Sebastien Jodogne, ICTEAM UCLouvain, Belgium
+ *
+ * This program is free software: you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser 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
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this program. If not, see
+ * <http://www.gnu.org/licenses/>.
+ **/
+
+
+#pragma once
+
+#include "../Scene2DViewport/OneGesturePointerTracker.h"
+#include "../Viewport/ViewportLocker.h"
+
+#include <boost/weak_ptr.hpp>
+
+namespace OrthancStone
+{
+  class MagnifyingGlassTracker : public OneGesturePointerTracker
+  {
+  private:
+    boost::weak_ptr<IViewport>  viewport_;
+    ScenePoint2D                pivot_;
+    AffineTransform2D           originalSceneToCanvas_;
+    AffineTransform2D           originalCanvasToScene_;
+
+    void Update(ViewportLocker& locker,
+                const PointerEvent& event);
+    
+  public:
+    MagnifyingGlassTracker(boost::weak_ptr<IViewport> viewport,
+                           const PointerEvent& event);
+    
+    virtual void PointerUp(const PointerEvent& event,
+                           const Scene2D& scene) ORTHANC_OVERRIDE;
+    
+    virtual void PointerMove(const PointerEvent& event,
+                             const Scene2D& scene) ORTHANC_OVERRIDE;
+    
+    virtual void Cancel(const Scene2D& scene) ORTHANC_OVERRIDE;
+  };
+}