[vtkusers] 2D Image viewing revisited

[David Gobbi]

Hi John,

I use two methods that I've mentioned in the list recently:

1) ParallelProjection plus a texture, zoom & pan work like
   to 'trackball' interaction and rotation is disabled.

2) vtkImageReslice plus a vtkActor2D for zoom & pan, completely
   custom code for interaction (interaction written in python,
   zoom & pan done via vtkImageReslice).
   The interaction code also moves the camera around, so that
   any vtkActors used for annotation also move when zoom, pan
   are done.

In both cases, I use the vtkRenderer + vtkRenderWindow... I never
use the vtkImageWindow, even for 2D image viewing.

The 'select the area you want to zoom in on' type of interaction
doesn't appeal to me, I prefer to use a smooth zoom (but my images
are a lot smaller than yours, I think).

 - David

On Thu, 28 Jun 2001, John Biddiscombe wrote:

> Dear anyone,
>
> The question of 2D image viewing has cropped up several times lately and I
> wonder if there is a "best" way of implementing this. I've written what
> seems to me to be a very cumbersome and lengthy implementation of image
> zooming, panning, region selection and had to modify vtkActor and
> imagemapper  and renderwindow to get it working the way I want.
>
> It seems there ought to be an easier way of achieving it by simply setting
> camera projection to parallel, altering the viewing angles and zoom etc
> etc. My question is...
>
> How does everyone else view 2D images, select regions, magnify them and
> zoom in on interesting features etc?
>
> thanks
>
> JB
>
>
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