--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/OrthancStone/Sources/Scene2DViewport/MeasureTool.cpp	Tue Jul 07 16:21:02 2020 +0200
@@ -0,0 +1,84 @@
+/**
+ * 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 "MeasureTool.h"
+
+#include <Logging.h>
+#include <Enumerations.h>
+#include <OrthancException.h>
+
+#include <boost/math/constants/constants.hpp>
+
+#include "../Viewport/IViewport.h"
+
+namespace OrthancStone
+{
+  void MeasureTool::Enable()
+  {
+    enabled_ = true;
+    RefreshScene();
+  }
+
+  void MeasureTool::Disable()
+  {
+    enabled_ = false;
+    RefreshScene();
+  }
+
+  bool MeasureTool::IsEnabled() const
+  {
+    return enabled_;
+  }
+
+  MeasureTool::MeasureTool(
+    boost::shared_ptr<IViewport> viewport)
+    : viewport_(viewport)
+    , enabled_(true)
+  {
+
+  }
+
+  void MeasureTool::PostConstructor()
+  {
+    std::unique_ptr<IViewport::ILock> lock(viewport_->Lock());
+    ViewportController& controller = lock->GetController();
+
+    Register<ViewportController::SceneTransformChanged>(
+      controller, 
+      &MeasureTool::OnSceneTransformChanged);
+  }
+
+  bool MeasureTool::IsSceneAlive() const
+  {
+    // since the lifetimes of the viewport, viewportcontroller (and the
+    // measuring tools inside it) are linked, the scene is always alive as 
+    // long as "this" is alive
+    return true;
+  }
+
+  void MeasureTool::OnSceneTransformChanged(
+    const ViewportController::SceneTransformChanged& message)
+  {
+    RefreshScene();
+  }
+
+
+}
+