--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/Framework/Scene2DViewport/MeasureTool.cpp	Fri May 24 15:59:51 2019 +0200
@@ -0,0 +1,115 @@
+/**
+ * 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 "MeasureTool.h"
+
+#include <Core/Logging.h>
+#include <Core/Enumerations.h>
+#include <Core/OrthancException.h>
+
+#include <boost/math/constants/constants.hpp>
+
+namespace OrthancStone
+{
+  MeasureTool::~MeasureTool()
+  {
+
+  }
+
+  void MeasureTool::Enable()
+  {
+    enabled_ = true;
+    RefreshScene();
+  }
+
+  void MeasureTool::Disable()
+  {
+    enabled_ = false;
+    RefreshScene();
+  }
+
+  bool MeasureTool::IsEnabled() const
+  {
+    return enabled_;
+  }
+
+
+  ViewportControllerConstPtr MeasureTool::GetController() const
+  {
+    ViewportControllerConstPtr controller = controllerW_.lock();
+    if (!controller)
+      throw Orthanc::OrthancException(Orthanc::ErrorCode_InternalError,
+        "Using dead ViewportController object!");
+    return controller;
+  }
+
+  ViewportControllerPtr MeasureTool::GetController()
+  {
+#if 1
+    return boost::const_pointer_cast<ViewportController>
+      (const_cast<const MeasureTool*>(this)->GetController());
+    //return boost::const_<ViewportControllerPtr>
+    //  (const_cast<const MeasureTool*>(this)->GetController());
+#else
+    ViewportControllerPtr controller = controllerW_.lock();
+    if (!controller)
+      throw Orthanc::OrthancException(Orthanc::ErrorCode_InternalError, 
+        "Using dead ViewportController object!");
+    return controller;
+#endif
+  }
+
+  Scene2DPtr MeasureTool::GetScene()
+  {
+    return GetController()->GetScene();
+  }
+
+  Scene2DConstPtr MeasureTool::GetScene() const
+  {
+    return GetController()->GetScene();
+  }
+
+  MeasureTool::MeasureTool(MessageBroker& broker,
+    ViewportControllerWPtr controllerW)
+    : IObserver(broker)
+    , controllerW_(controllerW)
+    , enabled_(true)
+  {
+    GetController()->RegisterObserverCallback(
+      new Callable<MeasureTool, ViewportController::SceneTransformChanged>
+      (*this, &MeasureTool::OnSceneTransformChanged));
+  }
+
+
+  bool MeasureTool::IsSceneAlive() const
+  {
+    ViewportControllerPtr controller = controllerW_.lock();
+    return (controller.get() != NULL);
+  }
+
+  void MeasureTool::OnSceneTransformChanged(
+    const ViewportController::SceneTransformChanged& message)
+  {
+    RefreshScene();
+  }
+
+
+}
+