[vtkusers] Interaction with vtkImageViewer

[Jesús Spí­nola]

Hello, I want to do some interaction with vtkImageViewer but I'm quite lost
with the vtk Command and Obsrvers interface so I need some help.

Basically this is what I wanna do:

- when I move the mouse over the image I want to display the pixel
coordinates of the image ( X, Y ) and the corresponding pixel value
- display the correct window/level values when they change
- display the corresponding slice when it changes
- display the viewport size ( width, height )

That's all, any help would very much apreciated
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