--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/OrthancStone/Sources/Scene2D/Scene2D.cpp	Tue Jul 07 16:21:02 2020 +0200
@@ -0,0 +1,272 @@
+/**
+ * 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 "Scene2D.h"
+
+#include <OrthancException.h>
+
+
+namespace OrthancStone
+{
+  class Scene2D::Item
+  {
+  private:
+    std::unique_ptr<ISceneLayer>  layer_;
+    uint64_t                    identifier_;
+
+  public:
+    Item(ISceneLayer* layer,
+         uint64_t identifier) :
+      layer_(layer),
+      identifier_(identifier)
+    {
+      if (layer == NULL)
+      {
+        throw Orthanc::OrthancException(Orthanc::ErrorCode_NullPointer);
+      }
+    }
+
+    ISceneLayer& GetLayer() const
+    {
+      if (layer_.get() == NULL)
+      {
+        LOG(ERROR) << "Scene2D::Item::GetLayer(): (layer_.get() == NULL)";
+        throw Orthanc::OrthancException(Orthanc::ErrorCode_BadSequenceOfCalls);
+      }
+      else
+      {
+        return *layer_;
+      }
+    }
+
+    ISceneLayer* ReleaseLayer()
+    {
+      if (layer_.get() == NULL)
+      {
+        LOG(ERROR) << "Scene2D::Item::ReleaseLayer(): (layer_.get() == NULL)";
+        throw Orthanc::OrthancException(Orthanc::ErrorCode_BadSequenceOfCalls);
+      }
+      else
+      {
+        return layer_.release();
+      }
+    }
+
+    uint64_t GetIdentifier() const
+    {
+      return identifier_;
+    }
+  };
+  
+  
+  Scene2D::Scene2D(const Scene2D& other) 
+    : sceneToCanvas_(other.sceneToCanvas_)
+    , canvasToScene_(other.canvasToScene_)
+    , layerCounter_(0)
+  {
+    for (Content::const_iterator it = other.content_.begin();
+         it != other.content_.end(); ++it)
+    {
+      content_[it->first] = new Item(it->second->GetLayer().Clone(), layerCounter_++);
+    }
+  }
+
+    
+  Scene2D::~Scene2D()
+  {
+    for (Content::iterator it = content_.begin(); 
+         it != content_.end(); ++it)
+    {
+      assert(it->second != NULL);
+      delete it->second;
+    }
+  }
+
+
+  void Scene2D::SetLayer(int depth,
+                         ISceneLayer* layer)  // Takes ownership
+  {
+    LOG(TRACE) << "SetLayer(" << depth << ", " << reinterpret_cast<intptr_t>(layer) << ")";
+    std::unique_ptr<Item> item(new Item(layer, layerCounter_++));
+
+    if (layer == NULL)
+    {
+      throw Orthanc::OrthancException(Orthanc::ErrorCode_NullPointer);
+    }
+
+    Content::iterator found = content_.find(depth);
+
+    if (found == content_.end())
+    {
+      content_[depth] = item.release();
+    }
+    else
+    {
+      assert(found->second != NULL);
+      delete found->second;
+      found->second = item.release();
+    }
+  }
+
+
+  void Scene2D::DeleteLayer(int depth)
+  {
+
+    Content::iterator found = content_.find(depth);
+
+    if (found != content_.end())
+    {
+      LOG(TRACE) << "DeleteLayer --found-- (" << depth << ")";
+      assert(found->second != NULL);
+      delete found->second;
+      content_.erase(found);
+    }    
+  }
+
+  
+  bool Scene2D::HasLayer(int depth) const
+  {
+    return (content_.find(depth) != content_.end());
+  }
+
+
+  ISceneLayer& Scene2D::GetLayer(int depth) const
+  {
+    Content::const_iterator found = content_.find(depth);
+
+    if (found == content_.end())
+    {
+      throw Orthanc::OrthancException(Orthanc::ErrorCode_ParameterOutOfRange);
+    }
+    else
+    {
+      assert(found->second != NULL);
+      return found->second->GetLayer();
+    }
+  }
+
+  
+  int Scene2D::GetMinDepth() const
+  {
+    if (content_.size() == 0)
+      return 0;
+    else
+      return content_.begin()->first;
+  }
+
+
+  int Scene2D::GetMaxDepth() const
+  {
+    if (content_.size() == 0)
+      return 0;
+    else
+      return content_.rbegin()->first;
+  }
+
+  ISceneLayer* Scene2D::ReleaseLayer(int depth)
+  {
+    Content::iterator found = content_.find(depth);
+
+    if (found == content_.end())
+    {
+      throw Orthanc::OrthancException(Orthanc::ErrorCode_ParameterOutOfRange);
+    }
+    else
+    {
+      assert(found->second != NULL);
+
+      std::unique_ptr<ISceneLayer> layer(found->second->ReleaseLayer());
+      assert(layer.get() != NULL);
+
+      content_.erase(found);
+
+      return layer.release();
+    }    
+  }
+
+  void Scene2D::Apply(IVisitor& visitor) const
+  {
+    for (Content::const_iterator it = content_.begin(); 
+         it != content_.end(); ++it)
+    {
+      assert(it->second != NULL);
+      visitor.Visit(*this, it->second->GetLayer(), it->second->GetIdentifier(), it->first);
+    }
+  }
+
+
+  void Scene2D::SetSceneToCanvasTransform(const AffineTransform2D& transform)
+  {
+    // Make sure the transform is invertible before making any change
+    AffineTransform2D inverse = AffineTransform2D::Invert(transform);
+
+    sceneToCanvas_ = transform;
+    canvasToScene_ = inverse;
+  }
+
+  void Scene2D::GetBoundingBox(Extent2D &target) const
+  {
+    target.Reset();
+
+    for (Content::const_iterator it = content_.begin();
+         it != content_.end(); ++it)
+    {
+      assert(it->second != NULL);
+
+      Extent2D tmp;
+      if (it->second->GetLayer().GetBoundingBox(tmp))
+      {
+        target.Union(tmp);
+      }
+    }
+  }
+
+  void Scene2D::FitContent(unsigned int canvasWidth,
+                           unsigned int canvasHeight)
+  {
+    Extent2D extent;
+
+    GetBoundingBox(extent);
+
+    if (!extent.IsEmpty())
+    {
+      double zoomX = static_cast<double>(canvasWidth) / extent.GetWidth();
+      double zoomY = static_cast<double>(canvasHeight) / extent.GetHeight();
+
+      double zoom = std::min(zoomX, zoomY);
+      if (LinearAlgebra::IsCloseToZero(zoom))
+      {
+        zoom = 1;
+      }
+
+      double panX = extent.GetCenterX();
+      double panY = extent.GetCenterY();
+
+      // Bring the center of the scene to (0,0)
+      AffineTransform2D t1 = AffineTransform2D::CreateOffset(-panX, -panY);
+      
+      // Scale the scene
+      AffineTransform2D t2 = AffineTransform2D::CreateScaling(zoom, zoom);
+
+      SetSceneToCanvasTransform(AffineTransform2D::Combine(t2, t1));
+    }
+  }
+}