# File vtk/tk/vtkTkImageViewerWidget.rb, line 190 def StartWindowLevelInteraction(x,y) if ! @FocusOnEnter _GrabFocus end viewer = @ImageViewer @LastX = x @LastY = y @Window = viewer.GetColorWindow.to_f @Level = viewer.GetColorLevel.to_f # make the window level text visible @LevelActor.SetVisibility(1) @WindowActor.SetVisibility(1) self.UpdateWindowLevelInteraction(x,y) return nil end