Resizing vtkImageWindow vs. Resizing vtkRenderWindow

[David Gobbi]

Hi Brian,

There are two ways of doing what you are looking for.
1) use a vtkRenderWindow with parallel projection, and display 
   your images on texture maps
2) use a vtkImageWindow, but use either vtkImageResample or
   vtkImageReslice to scale the image data -- see the 
   example contrib/examplesPython/SliceViewerWidget.py 
   in recent nightly releases to get an idea of the math involved.

 - David

--
  David Gobbi, MSc                    dgobbi at irus.rri.on.ca
  Advanced Imaging Research Group
  Robarts Research Institute, University of Western Ontario

On Fri, 19 Nov 1999, Brian Alexander Todd wrote:

> I have a question about resizing windows in vtk.  vtkRenderWindow
> seems to respond to size events automatically by scaling all
> of the actors to the new screen coordinates.  vtkImageWindow does
> not.  I assume that this behavior is used because images have 
> implicit geometry and the window is therefore expected to conform
> to the image geometry.
> 
> For my application, I would like to implement some default rescaling
> of images (the images are subordinate to the window).  I would probably
> have the image maximize its dimensions to fill the window while 
> maintaining the appropriate aspect ratio.  What is the easiest way
> to go about this.  It would be best if it could occur at the level
> of vtkImageWindow (since I already have a reference to this and
> it assumes little), maybe if at the vtkImager level if vtkImageWindow
> is not possible, but preferably not at the level of individual image
> sources or something.  
> 
> What is the best way to go about this.
> 
> Thanks,
> Brian
> 
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