--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/Samples/Common/MeasureTrackers.h	Thu May 09 10:41:31 2019 +0200
@@ -0,0 +1,74 @@
+/**
+ * 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/>.
+ **/
+
+#pragma once
+
+#include "../../Framework/Scene2D/IPointerTracker.h"
+#include "../../Framework/Scene2D/Scene2D.h"
+
+#include "MeasureTools.h"
+#include "MeasureCommands.h"
+
+#include <vector>
+
+namespace OrthancStone
+{
+  class CreateMeasureTracker : public IPointerTracker
+  {
+  public:
+    virtual void Update(const PointerEvent& e) ORTHANC_OVERRIDE;
+    virtual void Release() ORTHANC_OVERRIDE;
+  protected:
+    CreateMeasureTracker(
+      Scene2D&                        scene,
+      std::vector<TrackerCommandPtr>& undoStack,
+      std::vector<MeasureToolPtr>&    measureTools);
+
+    ~CreateMeasureTracker();
+  
+  private:
+    Scene2D&                        scene_;
+    std::vector<TrackerCommandPtr>& undoStack_;
+    std::vector<MeasureToolPtr>&    measureTools_;
+    bool                            commitResult_;
+
+  protected:
+    CreateMeasureCommandPtr         command_;
+  };
+
+  class CreateLineMeasureTracker : public CreateMeasureTracker
+  {
+  public:
+    /**
+    When you create this tracker, you need to supply it with the undo stack
+    where it will store the commands that perform the actual measure tool
+    creation and modification.
+    In turn, a container for these commands to store the actual measuring
+    must be supplied, too
+    */
+    CreateLineMeasureTracker(
+      Scene2D&                        scene,
+      std::vector<TrackerCommandPtr>& undoStack,
+      std::vector<MeasureToolPtr>&    measureTools,
+      const PointerEvent&             e);
+
+    ~CreateLineMeasureTracker();
+  };
+}