--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/OrthancStone/Sources/Scene2DViewport/MeasureTrackers.cpp	Tue Jul 07 16:21:02 2020 +0200
@@ -0,0 +1,100 @@
+/**
+ * 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 "MeasureTrackers.h"
+#include <OrthancException.h>
+
+namespace OrthancStone
+{
+
+  CreateMeasureTracker::CreateMeasureTracker(boost::shared_ptr<IViewport> viewport)
+    : viewport_(viewport)
+    , alive_(true)
+    , commitResult_(true)
+  {
+  }
+
+  void CreateMeasureTracker::Cancel()
+  {
+    commitResult_ = false;
+    alive_ = false;
+  }
+
+  bool CreateMeasureTracker::IsAlive() const
+  {
+    return alive_;
+  }
+
+  CreateMeasureTracker::~CreateMeasureTracker()
+  {
+    // if the tracker completes successfully, we add the command
+    // to the undo stack
+    // otherwise, we simply undo it
+
+    std::unique_ptr<IViewport::ILock> lock(viewport_->Lock());
+
+    if (commitResult_)
+      lock->GetController().PushCommand(command_);
+    else
+      command_->Undo();
+
+    lock->Invalidate();
+  }
+
+  EditMeasureTracker::EditMeasureTracker(boost::shared_ptr<IViewport> viewport, const PointerEvent& e)
+    : viewport_(viewport)
+    , alive_(true)
+    , commitResult_(true)
+  {
+    std::unique_ptr<IViewport::ILock> lock(viewport_->Lock());
+
+    originalClickPosition_ = e.GetMainPosition().Apply(
+      lock->GetController().GetScene().GetCanvasToSceneTransform());
+  }
+
+  void EditMeasureTracker::Cancel()
+  {
+    commitResult_ = false;
+    alive_ = false;
+  }
+
+  bool EditMeasureTracker::IsAlive() const
+  {
+    return alive_;
+  }
+
+  EditMeasureTracker::~EditMeasureTracker()
+  {
+    // if the tracker completes successfully, we add the command
+    // to the undo stack
+    // otherwise, we simply undo it
+
+    std::unique_ptr<IViewport::ILock> lock(viewport_->Lock());
+
+    if (commitResult_)
+      lock->GetController().PushCommand(command_);
+    else
+      command_->Undo();
+
+    lock->Invalidate();
+  }
+}
+
+