--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/OrthancStone/Sources/Scene2D/Scene2D.h	Tue Jul 07 16:21:02 2020 +0200
@@ -0,0 +1,120 @@
+/**
+ * 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 "ISceneLayer.h"
+#include "../Toolbox/AffineTransform2D.h"
+#include "../Messages/IObservable.h"
+#include "../Messages/IMessage.h"
+
+#include <map>
+
+namespace OrthancStone
+{
+  class Scene2D : public boost::noncopyable
+  {
+  public:
+    class IVisitor : public boost::noncopyable
+    {
+    public:
+      virtual ~IVisitor()
+      {
+      }
+
+      virtual void Visit(const Scene2D& scene,
+                         const ISceneLayer& layer,
+                         uint64_t layerIdentifier,
+                         int depth) = 0;
+    };
+
+  private:
+    class Item;
+    
+    typedef std::map<int, Item*>  Content;
+
+    Content            content_;
+    AffineTransform2D  sceneToCanvas_;
+    AffineTransform2D  canvasToScene_;
+    uint64_t           layerCounter_;
+
+    Scene2D(const Scene2D& other);
+    
+  public:
+    Scene2D() : layerCounter_(0)
+    {
+    }
+    
+    ~Scene2D();
+
+    Scene2D* Clone() const
+    {
+      return new Scene2D(*this);
+    }
+
+    void SetLayer(int depth,
+                  ISceneLayer* layer);  // Takes ownership
+
+    /**
+    Removes the layer at specified depth and deletes the underlying object
+    */
+    void DeleteLayer(int depth);
+
+    bool HasLayer(int depth) const;
+
+    ISceneLayer& GetLayer(int depth) const;
+
+    /**
+    Returns the minimum depth among all layers or 0 if there are no layers
+    */
+    int GetMinDepth() const;
+
+    /**
+    Returns the minimum depth among all layers or 0 if there are no layers
+    */
+    int GetMaxDepth() const;
+
+    /**
+    Removes the layer at specified depth and transfers the object 
+    ownership to the caller
+    */
+    ISceneLayer* ReleaseLayer(int depth);
+
+    void Apply(IVisitor& visitor) const;
+
+    const AffineTransform2D& GetSceneToCanvasTransform() const
+    {
+      return sceneToCanvas_;
+    }
+
+    const AffineTransform2D& GetCanvasToSceneTransform() const
+    {
+      return canvasToScene_;
+    }
+
+    void SetSceneToCanvasTransform(const AffineTransform2D& transform);
+
+    void FitContent(unsigned int canvasWidth,
+                    unsigned int canvasHeight);
+
+    void GetBoundingBox(Extent2D& target) const;
+  };
+}