--- a/OrthancStone/Sources/Scene2DViewport/CreateLineMeasureTracker.cpp	Mon Sep 21 14:50:26 2020 +0200
+++ b/OrthancStone/Sources/Scene2DViewport/CreateLineMeasureTracker.cpp	Mon Sep 21 17:46:39 2020 +0200
@@ -30,12 +30,14 @@
     const PointerEvent&             e)
     : CreateMeasureTracker(viewport)
   {
-    ScenePoint2D point = e.GetMainPosition();
+    ScenePoint2D point;
+    
     {
       std::unique_ptr<IViewport::ILock> lock(viewport_->Lock());
       ViewportController& controller = lock->GetController();
       point = e.GetMainPosition().Apply(controller.GetScene().GetCanvasToSceneTransform());
     }
+    
     command_.reset(new CreateLineMeasureCommand(viewport, point));
   }