new helper methods

improved elememt-selection
changed some parameters
show length for selected obstacles/doors
minor fixes

mapview/2D/MV2DElement.h

@@ -9,6 +9,8 @@
 #include <Indoor/geo/BBox2.h>
 #include <Indoor/geo/Line2.h>
 
+#include "ClickDist.h"
+
 /**
  * represents one drawable, selectable, editable, ...
  * element shown within the MapView2D
@@ -29,7 +31,7 @@ public:
 	virtual BBox2 getBoundingBox() const = 0;
 
 	/** get the element's minimal distance (nearest whatsoever) to the given point */
-	virtual float getMinDistanceXY(const Point2 p) const = 0;
+	virtual ClickDist getMinDistanceXY(const Point2 p) const = 0;
 
 	/** repaint me */
 	virtual void paint(Painter& p) = 0;