[vtkusers] vtkImageViewer2 image display

[tobse]

Hi,

I calculated the FocalPoint and the Position of the camera with respect to
the image size

1. determine the size of the image in x and y direction (using the extent
and the spacing of the input image)
2. based on the larger axes, you can modify the view angle or the distance
of the camera
  
            angle = Camera->GetViewAngle();
            distance= SizeOfLargerAxes/2/tan(angle/2);
3. Determine the middle of the image
4. Focus the camera to the middle of the image 

      
            Camera->SetFocalPoint(xmax/2, ymax/2, 0);
             Camera->SetPosition(xmax/2,ymax/2,distance);

This will work as long as the image is in the xy-plane , with z=0.

hope this will help

tobse
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