[vtkusers] zoom in on a specific point

[Jonathan Morra]

I have a vtkImageViewer2 that I wish to zoom in on.  I have applied
the vtkInteractorStyleImage to the image, and I can zoom using the right
mouse button.  However, this always zooms in on the center of the image.
 I'd like to center the zoom on the location that the mouse was initially
clicked on.  Does anyone have an example of how to do this?

Thanks

PS I'm working in Java
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