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Re: Problems with draw widget scrolling in IDL 5.0 [message #9768 is a reply to message #9692]

Tue, 12 August 1997 00:00

Roberto Racca
Messages: 3
Registered: August 1997

Junior Member

David Fanning <davidf@dfanning.com> wrote in article
<MPG.e5a1df767a35afd9896dd@news.frii.com>...

> As a work-around, what about making the draw widget as large
> as you will possibly need and then restricting the viewport
> scrolling in such a way as to keep the viewport over the
> current image.

Yes, I had tried the approach of the constantly large draw area. It
works, of course, but the problem is that I can think of no way to
'restrict the scrolling' as you say. It is most disconcerting to the
users if, having scrolled the viewport to some region far from the
top left corner and then zoomed back, they are confronted with a
blank screen and have to 'search' for the image. As I mentioned in my
original post, you cannot reliably force a scroll in software using
set_draw_view in widget_control. Any thoughts?

Thanks!
Roberto

--
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Roberto Racca, Ph.D.
Vice President for Research and Development
JASCO Research Ltd, Victoria, B.C., CANADA
tel. +1.250.5441187 fax +1.250.5444916
rob@jasco.com http://www.jasco.com

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[Message index]

		Problems with draw widget scrolling in IDL 5.0 By: Roberto Racca on Mon, 11 August 1997 00:00
		Re: Problems with draw widget scrolling in IDL 5.0 By: Roberto Racca on Tue, 12 August 1997 00:00
		Re: Problems with draw widget scrolling in IDL 5.0 By: davidf on Tue, 12 August 1997 00:00
		Re: Problems with draw widget scrolling in IDL 5.0 By: Roberto Racca on Tue, 12 August 1997 00:00
		Re: Problems with draw widget scrolling in IDL 5.0 By: davidf on Tue, 12 August 1997 00:00

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