[vtkusers] Zooming etc

[John Platt]

Hi Jim,

To address your first problem I wrote a rectangular selection widget
(hacked vtkPlaneWidget) to give visual feedback on the selection, then
moved the camera to the centre of the rectangle and zoomed in by
changing the parallel scale (parallel projection only).

Malcolm Drummond posted a class vtkAxes2D which displays axes in the
overlay plane. It's relatively simple to add axes labels. I also made a
minor change to ensure the length of each axis remained constant as the
set rotated.

Hope this is some encouragement.

-----Original Message-----
From: vtkusers-admin at vtk.org [mailto:vtkusers-admin at vtk.org] On Behalf
Of James C. Robinson
Sent: 23 January 2004 21:51
To: vtkusers at vtk.org
Subject: [vtkusers] Zooming etc

Dear All,

Has anyone any ideas on how to get more or different control over a vtk
render window. For example, is it possible to have a classic zoom
function
whereby the user defines a rectangle to which the image will zoom (by
moving
the camera)?

Also, how does one get a set of axis to sit in the corner of the screen
denoting x,y,z - never moving (just rotating as the camera position
rotates)
and never changing scale (as the camera zooms).

Regards,

Jim

______________________

James C. Robinson, PhD,
Chartered Engineer,
Kepler Simulation Systems Ltd.,
Unit 10,
Melbourne Business Park,
Model Farm Road,
Cork,
Eire

Tel:         +353-21-4822028
Tel:         +353-21-4817267
Tel:         +353-87-2393010
Fax:        +353-21-4822721
E-mail:     j.robinson at kepler-systems.com
______________________


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