--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/Samples/Deprecated/Sdl/TrackerSampleApp.h	Tue Apr 07 14:31:28 2020 +0200
@@ -0,0 +1,148 @@
+/**
+ * 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/>.
+ **/
+
+
+#include "../../Framework/Messages/IObserver.h"
+#include "../../Framework/Scene2D/OpenGLCompositor.h"
+#include "../../Framework/Scene2DViewport/IFlexiblePointerTracker.h"
+#include "../../Framework/Scene2DViewport/MeasureTool.h"
+#include "../../Framework/Scene2DViewport/PredeclaredTypes.h"
+#include "../../Framework/Scene2DViewport/ViewportController.h"
+#include "../../Framework/Viewport/SdlViewport.h"
+
+#include <SDL.h>
+
+#include <boost/make_shared.hpp>
+#include <boost/shared_ptr.hpp>
+#include <boost/enable_shared_from_this.hpp>
+
+namespace OrthancStone
+{
+  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_0 = 32;
+  static const unsigned int FONT_SIZE_1 = 24;
+
+  class Scene2D;
+  class UndoStack;
+
+  class TrackerSampleApp : public IObserver
+    , public boost::enable_shared_from_this<TrackerSampleApp>
+  {
+  public:
+    // 12 because.
+    TrackerSampleApp(MessageBroker& broker);
+    void PrepareScene();
+    void Run();
+    void SetInfoDisplayMessage(std::string key, std::string value);
+    void DisableTracker();
+
+    void HandleApplicationEvent(const SDL_Event& event);
+
+    /**
+    This method is called when the scene transform changes. It allows to
+    recompute the visual elements whose content depend upon the scene transform
+    */
+    void OnSceneTransformChanged(
+      const ViewportController::SceneTransformChanged& message);
+
+  private:
+    void SelectNextTool();
+    void CreateRandomMeasureTool();
+
+
+    /**
+    In the case of this app, the viewport is an SDL viewport and it has 
+    a OpenGLCompositor& GetCompositor() method
+    */
+    ICompositor& GetCompositor();
+
+    /**
+    See the other overload
+    */
+    const ICompositor& GetCompositor() const;
+
+    /**
+    This returns a random point in the canvas part of the scene, but in
+    scene coordinates
+    */
+    ScenePoint2D GetRandomPointInScene() const;
+
+    boost::shared_ptr<IFlexiblePointerTracker> TrackerHitTest(const PointerEvent& e);
+
+    boost::shared_ptr<IFlexiblePointerTracker> CreateSuitableTracker(
+      const SDL_Event& event,
+      const PointerEvent& e);
+
+    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(boost::shared_ptr<TrackerCommand> cmd);
+    void Undo();
+    void Redo();
+
+  private:
+    void DisplayFloatingCtrlInfoText(const PointerEvent& e);
+    void DisplayInfoText();
+    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.
+    */
+    boost::shared_ptr<ViewportController> controller_;
+
+    std::map<std::string, std::string> infoTextMap_;
+    boost::shared_ptr<IFlexiblePointerTracker> activeTracker_;
+
+    //static const int LAYER_POSITION = 150;
+
+    int TEXTURE_2x2_1_ZINDEX;
+    int TEXTURE_1x1_ZINDEX;
+    int TEXTURE_2x2_2_ZINDEX;
+    int LINESET_1_ZINDEX;
+    int LINESET_2_ZINDEX;
+    int FLOATING_INFOTEXT_LAYER_ZINDEX;
+    int FIXED_INFOTEXT_LAYER_ZINDEX;
+
+    GuiTool currentTool_;
+    boost::shared_ptr<UndoStack> undoStack_;
+    SdlOpenGLViewport viewport_;
+  };
+
+}