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

[James Z.]

Hi, all,
  
  how to get the mouse position and scalar value on that position in a  vtkImageViewer2 when viewing 2D image slices? I need to disply these  information in the 2D slice viewer. 
  
  Thanks a lot!
  
  regards,
  
  James
  
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