[vtkusers] how to get the mouse position and scalar value on that position in vtkImageViewer2

[shengweng]

Hi, James,
  Did you implement the function to display mouse position and intensity?
How to use the vtkImageCoordinateWidget class showed at
http://vtk.1045678.n5.nabble.com/point-picking-on-vtkImageActors-td1227852.html#a1227853?
  Could you give me some example codes?
  Thanks.

                     Shengwen

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