--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/Framework/Layers/ReferenceLineFactory.cpp	Fri Nov 09 17:37:34 2018 +0100
@@ -0,0 +1,137 @@
+/**
+ * Stone of Orthanc
+ * Copyright (C) 2012-2016 Sebastien Jodogne, Medical Physics
+ * Department, University Hospital of Liege, Belgium
+ * Copyright (C) 2017-2018 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 "ReferenceLineFactory.h"
+
+#include "LineLayerRenderer.h"
+
+namespace OrthancStone
+{
+  ReferenceLineFactory::ReferenceLineFactory(LayeredSceneWidget& owner,
+                                             LayeredSceneWidget& sibling) :
+    owner_(owner),
+    sibling_(sibling),
+    hasLayerIndex_(false)
+  {
+    style_.SetColor(0, 255, 0);
+    slice_ = sibling.GetSlice();
+    sibling_.Register(*this);
+  }
+
+
+  void ReferenceLineFactory::NotifySliceChange(const LayeredSceneWidget& source,
+                                               const SliceGeometry& slice)
+  {
+    if (&source == &sibling_)
+    {
+      SetSlice(slice);
+    }
+  }
+
+
+  void ReferenceLineFactory::SetLayerIndex(size_t layerIndex)
+  {
+    hasLayerIndex_ = true;
+    layerIndex_ = layerIndex;
+  }
+
+
+  void ReferenceLineFactory::SetStyle(const RenderStyle& style)
+  {
+    style_ = style;
+  }
+
+
+  RenderStyle ReferenceLineFactory::GetRenderStyle()
+  {
+    return style_;
+  }
+
+
+  void ReferenceLineFactory::SetSlice(const SliceGeometry& slice)
+  {
+    slice_ = slice;
+
+    if (hasLayerIndex_)
+    {
+      owner_.InvalidateLayer(layerIndex_);
+    }
+  }
+
+
+  ILayerRenderer* ReferenceLineFactory::CreateLayerRenderer(const SliceGeometry& viewportSlice)
+  {
+    Vector p, d;
+
+    // Compute the line of intersection between the two slices
+    if (!GeometryToolbox::IntersectTwoPlanes(p, d, 
+                                             slice_.GetOrigin(), slice_.GetNormal(),
+                                             viewportSlice.GetOrigin(), viewportSlice.GetNormal()))
+    {
+      // The two slice are parallel, don't try and display the intersection
+      return NULL;
+    }
+
+    double x1, y1, x2, y2;
+    viewportSlice.ProjectPoint(x1, y1, p);
+    viewportSlice.ProjectPoint(x2, y2, p + 1000.0 * d);
+
+    double sx1, sy1, sx2, sy2;
+    owner_.GetView().GetSceneExtent(sx1, sy1, sx2, sy2);
+        
+    if (GeometryToolbox::ClipLineToRectangle(x1, y1, x2, y2, 
+                                             x1, y1, x2, y2,
+                                             sx1, sy1, sx2, sy2))
+    {
+      std::auto_ptr<ILayerRenderer> layer(new LineLayerRenderer(x1, y1, x2, y2));
+      layer->SetLayerStyle(style_);
+      return layer.release();
+    }
+    else
+    {
+      // Parallel slices
+      return NULL;
+    }
+  }
+
+
+  ISliceableVolume& ReferenceLineFactory::GetSourceVolume() const
+  {
+    throw Orthanc::OrthancException(Orthanc::ErrorCode_InternalError);
+  }
+
+
+  void ReferenceLineFactory::Configure(LayeredSceneWidget& a,
+                                       LayeredSceneWidget& b)
+  {
+    {
+      size_t layerIndex;
+      ILayerRendererFactory& factory = a.AddLayer(layerIndex, new ReferenceLineFactory(a, b));
+      dynamic_cast<ReferenceLineFactory&>(factory).SetLayerIndex(layerIndex);
+    }
+
+    {
+      size_t layerIndex;
+      ILayerRendererFactory& factory = b.AddLayer(layerIndex, new ReferenceLineFactory(b, a));
+      dynamic_cast<ReferenceLineFactory&>(factory).SetLayerIndex(layerIndex);
+    }
+  }
+}