--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/OrthancStone/Sources/Scene2DViewport/CreateAngleMeasureTracker.cpp	Tue Jul 07 16:21:02 2020 +0200
@@ -0,0 +1,133 @@
+/**
+ * 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 "CreateAngleMeasureTracker.h"
+#include "CreateAngleMeasureCommand.h"
+
+#include <OrthancException.h>
+
+namespace OrthancStone
+{
+  CreateAngleMeasureTracker::CreateAngleMeasureTracker(
+    boost::shared_ptr<IViewport> viewport,
+    const PointerEvent& e)
+    : CreateMeasureTracker(viewport)
+    , state_(CreatingSide1)
+  {
+    ScenePoint2D point = e.GetMainPosition();
+    {    
+      std::unique_ptr<IViewport::ILock> lock(viewport_->Lock());
+      Scene2D& scene = lock->GetController().GetScene();
+      point = e.GetMainPosition().Apply(scene.GetCanvasToSceneTransform());
+    }
+    command_.reset(new CreateAngleMeasureCommand(viewport, point));
+  }
+
+  CreateAngleMeasureTracker::~CreateAngleMeasureTracker()
+  {
+  }
+
+  void CreateAngleMeasureTracker::PointerMove(const PointerEvent& event)
+  {
+    if (!alive_)
+    {
+      throw Orthanc::OrthancException(Orthanc::ErrorCode_InternalError,
+        "Internal error: wrong state in CreateAngleMeasureTracker::"
+        "PointerMove: active_ == false");
+    }
+
+    
+    {
+      std::unique_ptr<IViewport::ILock> lock(viewport_->Lock());
+      ViewportController& controller = lock->GetController();
+
+      ScenePoint2D scenePos = event.GetMainPosition().Apply(
+        controller.GetScene().GetCanvasToSceneTransform());
+
+      switch (state_)
+      {
+        case CreatingSide1:
+          GetCommand()->SetCenter(scenePos);
+          break;
+        case CreatingSide2:
+          GetCommand()->SetSide2End(scenePos);
+          break;
+        default:
+          throw Orthanc::OrthancException(Orthanc::ErrorCode_InternalError,
+                                          "Wrong state in CreateAngleMeasureTracker::"
+                                          "PointerMove: state_ invalid");
+      }
+      //LOG(TRACE) << "scenePos.GetX() = " << scenePos.GetX() << "     " <<
+      //  "scenePos.GetY() = " << scenePos.GetY();
+      lock->Invalidate();
+    }
+  }
+
+  void CreateAngleMeasureTracker::PointerUp(const PointerEvent& e)
+  {
+    // TODO: the current app does not prevent multiple PointerDown AND
+    // PointerUp to be sent to the tracker.
+    // Unless we augment the PointerEvent structure with the button index, 
+    // we cannot really tell if this pointer up event matches the initial
+    // pointer down event. Let's make it simple for now.
+
+    switch (state_)
+    {
+    case CreatingSide1:
+      state_ = CreatingSide2;
+      break;
+    case CreatingSide2:
+      throw Orthanc::OrthancException(Orthanc::ErrorCode_InternalError,
+        "Wrong state in CreateAngleMeasureTracker::"
+        "PointerUp: state_ == CreatingSide2 ; this should not happen");
+      break;
+    default:
+      throw Orthanc::OrthancException(Orthanc::ErrorCode_InternalError,
+        "Wrong state in CreateAngleMeasureTracker::"
+        "PointerMove: state_ invalid");
+    }
+  }
+
+  void CreateAngleMeasureTracker::PointerDown(const PointerEvent& e)
+  {
+    switch (state_)
+    {
+    case CreatingSide1:
+      throw Orthanc::OrthancException(Orthanc::ErrorCode_InternalError,
+        "Wrong state in CreateAngleMeasureTracker::"
+        "PointerDown: state_ == CreatingSide1 ; this should not happen");
+      break;
+    case CreatingSide2:
+      // we are done
+      alive_ = false;
+      break;
+    default:
+      throw Orthanc::OrthancException(Orthanc::ErrorCode_InternalError,
+        "Wrong state in CreateAngleMeasureTracker::"
+        "PointerMove: state_ invalid");
+    }
+  }
+
+  boost::shared_ptr<CreateAngleMeasureCommand> CreateAngleMeasureTracker::GetCommand()
+  {
+    return boost::dynamic_pointer_cast<CreateAngleMeasureCommand>(command_);
+  }
+
+}