Resizing vtkImageWindow vs. Resizing vtkRenderWindow

[Brian Alexander Todd]

Thanks David.  

Quick recap.  I had asked how to implement some default
resizing behavior for images in vtk.  David's responses
are: (I have a couple followup questions afterwards)

At 08:20 PM 11/19/99 -0500, David Gobbi wrote:
>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
>


I think I am going to go with the first option,
since I would prefer to work at the window level.  Will
I take a huge hit on efficiency since I'm moving away
from the image window, to the 3D pipeline?  I'm dealing
with images typically of 512x512 pixels and only one 
z-slice but I would like everything to run reasonably
smoothly on the average PC.  Is TPlane.tcl a good example 
of parallel projection, and displaying images on texture
maps or should I look somewhere else?

Thanks,
Brian Todd


My original message

>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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           _____________________________________________________
  ________|                                                     |________
  \       |   Brian Todd                email: bat5 at po.cwru.edu |       /
   \      |   N.O.B.L.                   home: (216) 791-2407   |      /
    \     |   C.W.R.U.                 office: (216) 368-4209   |     /
    /     |   Cleveland, OH 44106         fax: (216) 368-4969   |     \
   /      |_____________________________________________________|      \
  /___________)                                              (__________\


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