- Added a ClearAllChains method to PolylineSceneLayer --> revision must change when calling it ==> BumpRevision has been added to base class - Added some docs = Added GetMinDepth + GetMaxDepth to Scene2D (to alleviate the need for app- specific "Z depth registry" : clients may simply add a new layer on top or at the bottom of the existing layer set. - Added the line tracker measurement tools, commands and trackers. Generic base classes + Line measure - started work on the line measure handles

--- a/Framework/Scene2D/IPointerTracker.h	Thu May 02 18:58:46 2019 +0200
+++ b/Framework/Scene2D/IPointerTracker.h	Thu May 09 10:41:31 2019 +0200
@@ -32,8 +32,15 @@
     {
     }
 
+    /**
+    This method will be repeatedly called during user interaction
+    */
     virtual void Update(const PointerEvent& event) = 0;
 
+    /**
+    This method will be called if the tracker is to be abandoned without
+    committing its result
+    */
     virtual void Release() = 0;
   };
 }