--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/Samples/Common/AngleMeasureTool.cpp	Mon May 13 15:12:56 2019 +0200
@@ -0,0 +1,199 @@
+/**
+ * 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 "AngleMeasureTool.h"
+#include "MeasureToolsToolbox.h"
+
+#include <Core/Logging.h>
+
+#include <boost/math/constants/constants.hpp>
+
+namespace OrthancStone
+{
+  AngleMeasureTool::~AngleMeasureTool()
+  {
+    // this measuring tool is a RABI for the corresponding visual layers
+    // stored in the 2D scene
+    Disable();
+    RemoveFromScene();
+  }
+
+  void AngleMeasureTool::RemoveFromScene()
+  {
+    if (layersCreated)
+    {
+      assert(GetScene().HasLayer(polylineZIndex_));
+      assert(GetScene().HasLayer(textZIndex_));
+      GetScene().DeleteLayer(polylineZIndex_);
+      GetScene().DeleteLayer(textZIndex_);
+    }
+  }
+
+  void AngleMeasureTool::SetSide1End(ScenePoint2D pt)
+  {
+    side1End_ = pt;
+    RefreshScene();
+  }
+
+  void AngleMeasureTool::SetSide2End(ScenePoint2D pt)
+  {
+    side2End_ = pt;
+    RefreshScene();
+  }
+
+  void AngleMeasureTool::SetCenter(ScenePoint2D pt)
+  {
+    center_ = pt;
+    RefreshScene();
+  }
+  
+  PolylineSceneLayer* AngleMeasureTool::GetPolylineLayer()
+  {
+    assert(GetScene().HasLayer(polylineZIndex_));
+    ISceneLayer* layer = &(GetScene().GetLayer(polylineZIndex_));
+    PolylineSceneLayer* concreteLayer = dynamic_cast<PolylineSceneLayer*>(layer);
+    assert(concreteLayer != NULL);
+    return concreteLayer;
+  }
+
+  TextSceneLayer* AngleMeasureTool::GetTextLayer()
+  {
+    assert(GetScene().HasLayer(textZIndex_));
+    ISceneLayer* layer = &(GetScene().GetLayer(textZIndex_));
+    TextSceneLayer* concreteLayer = dynamic_cast<TextSceneLayer*>(layer);
+    assert(concreteLayer != NULL);
+    return concreteLayer;
+  }
+
+
+  void AngleMeasureTool::RefreshScene()
+  {
+    if (IsEnabled())
+    {
+
+      // get the scaling factor 
+      const double pixelToScene =
+        GetScene().GetCanvasToSceneTransform().ComputeZoom();
+
+      if (!layersCreated)
+      {
+        // Create the layers if need be
+
+        assert(textZIndex_ == -1);
+        {
+          polylineZIndex_ = GetScene().GetMaxDepth() + 100;
+          //LOG(INFO) << "set polylineZIndex_ to: " << polylineZIndex_;
+          std::auto_ptr<PolylineSceneLayer> layer(new PolylineSceneLayer());
+          GetScene().SetLayer(polylineZIndex_, layer.release());
+        }
+        {
+          textZIndex_ = GetScene().GetMaxDepth() + 100;
+          //LOG(INFO) << "set textZIndex_ to: " << textZIndex_;
+          std::auto_ptr<TextSceneLayer> layer(new TextSceneLayer());
+          GetScene().SetLayer(textZIndex_, layer.release());
+        }
+        layersCreated = true;
+      }
+      else
+      {
+        assert(GetScene().HasLayer(polylineZIndex_));
+        assert(GetScene().HasLayer(textZIndex_));
+      }
+      {
+        // Fill the polyline layer with the measurement line
+
+        PolylineSceneLayer* polylineLayer = GetPolylineLayer();
+        polylineLayer->ClearAllChains();
+        polylineLayer->SetColor(0, 223, 21);
+
+        // sides
+        {
+          {
+            PolylineSceneLayer::Chain chain;
+            chain.push_back(side1End_);
+            chain.push_back(center_);
+            polylineLayer->AddChain(chain, false);
+          }
+          {
+            PolylineSceneLayer::Chain chain;
+            chain.push_back(side2End_);
+            chain.push_back(center_);
+            polylineLayer->AddChain(chain, false);
+          }
+        }
+
+        // handles
+        {
+          //void AddSquare(PolylineSceneLayer::Chain& chain,const Scene2D& scene,const ScenePoint2D& centerS,const double& sideLength)
+
+          {
+            PolylineSceneLayer::Chain chain;
+            AddSquare(chain, GetScene(), side1End_, 10.0); //TODO: take DPI into account
+            polylineLayer->AddChain(chain, true);
+          }
+
+          {
+            PolylineSceneLayer::Chain chain;
+            AddSquare(chain, GetScene(), side2End_, 10.0); //TODO: take DPI into account
+            polylineLayer->AddChain(chain, true);
+          }
+        }
+
+        // arc
+        {
+          PolylineSceneLayer::Chain chain;
+
+          AddArc(chain, GetScene(), side1End_, center_, side2End_, 
+            20.0*pixelToScene, true); //TODO: true means always clockwise
+          polylineLayer->AddChain(chain, true);
+        }
+      }
+      {
+        // Set the text layer proporeties
+
+        // the angle is measured in a clockwise way between the points
+        double angleRad = MeasureAngle(side1End_, center_, side2End_);
+        double angleDeg = RadiansToDegrees(angleRad);
+               
+        TextSceneLayer* textLayer = GetTextLayer();
+
+        char buf[64];
+        sprintf(buf, "%0.02f deg", angleDeg);
+        textLayer->SetText(buf);
+        textLayer->SetColor(0, 223, 21);
+
+        ScenePoint2D textAnchor;
+        GetPositionOnBisectingLine(
+          textAnchor, side1End_, center_, side2End_, 40.0*pixelToScene);
+        textLayer->SetPosition(textAnchor.GetX(), textAnchor.GetY());
+      }
+    }
+    else
+    {
+      if (layersCreated)
+      {
+        RemoveFromScene();
+        layersCreated = false;
+      }
+    }
+  }
+
+
+}