--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/Samples/Sdl/TrackerSampleApp.h	Fri May 10 16:15:55 2019 +0200
@@ -0,0 +1,136 @@
+/**
+ * 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 <Framework/Scene2D/OpenGLCompositor.h>
+
+#include "../Common/IFlexiblePointerTracker.h"
+#include "../Common/MeasureTools.h"
+
+#include <SDL.h>
+
+#include <boost/make_shared.hpp>
+#include <boost/shared_ptr.hpp>
+
+namespace OrthancStone
+{
+  class TrackerCommand;
+  typedef boost::shared_ptr<TrackerCommand> TrackerCommandPtr;
+
+  enum GuiTool
+  {
+    GuiTool_Rotate = 0,
+    GuiTool_Pan,
+    GuiTool_Zoom,
+    GuiTool_LineMeasure,
+    GuiTool_CircleMeasure,
+    GuiTool_AngleMeasure,
+    GuiTool_EllipseMeasure,
+    GuiTool_LAST
+  };
+
+  const char* MeasureToolToString(size_t i);
+
+  static const unsigned int FONT_SIZE = 32;
+
+  class Scene2D;
+
+  class TrackerSampleApp
+  {
+  public:
+    // 12 because.
+    TrackerSampleApp() : currentTool_(GuiTool_Rotate)
+    {
+      TEXTURE_2x2_1_ZINDEX = 1;
+      TEXTURE_1x1_ZINDEX = 2;
+      TEXTURE_2x2_2_ZINDEX = 3;
+      LINESET_1_ZINDEX = 4;
+      LINESET_2_ZINDEX = 5;
+      INFOTEXT_LAYER_ZINDEX = 6;
+    }
+    void PrepareScene();
+
+    void DisableTracker();
+
+    Scene2D& GetScene();
+
+    void HandleApplicationEvent(
+      const OpenGLCompositor& compositor,
+      const SDL_Event& event);
+
+  private:
+    void SelectNextTool();
+
+
+    FlexiblePointerTrackerPtr TrackerHitTest(const PointerEvent& e);
+
+    FlexiblePointerTrackerPtr CreateSuitableTracker(
+      const SDL_Event& event,
+      const PointerEvent& e,
+      const OpenGLCompositor& compositor);
+
+    void TakeScreenshot(
+      const std::string& target,
+      unsigned int canvasWidth,
+      unsigned int canvasHeight);
+
+    /**
+      This adds the command at the top of the undo stack
+    */
+    void Commit(TrackerCommandPtr cmd);
+    void Undo();
+    void Redo();
+
+  private:
+    void DisplayInfoText(const PointerEvent& e);
+    void HideInfoText();
+
+  private:
+    /**
+    WARNING: the measuring tools do store a reference to the scene, and it 
+    paramount that the scene gets destroyed AFTER the measurement tools.
+    */
+    Scene2D scene_;
+
+    FlexiblePointerTrackerPtr activeTracker_;
+    std::vector<TrackerCommandPtr> undoStack_;
+
+    // we store the measure tools here so that they don't get deleted
+    std::vector<MeasureToolPtr> measureTools_;
+
+    //static const int LAYER_POSITION = 150;
+#if 0
+    int TEXTURE_2x2_1_ZINDEX = 12;
+    int TEXTURE_1x1_ZINDEX = 13;
+    int TEXTURE_2x2_2_ZINDEX = 14;
+    int LINESET_1_ZINDEX = 50;
+    int LINESET_2_ZINDEX = 100;
+    int INFOTEXT_LAYER_ZINDEX = 150;
+#else
+    int TEXTURE_2x2_1_ZINDEX;
+    int TEXTURE_1x1_ZINDEX;
+    int TEXTURE_2x2_2_ZINDEX;
+    int LINESET_1_ZINDEX;
+    int LINESET_2_ZINDEX;
+    int INFOTEXT_LAYER_ZINDEX;
+#endif
+    GuiTool currentTool_;
+  };
+
+}