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Re: Problems with draw widget scrolling in IDL 5.0 [message #9760 is a reply to message #9692]

Tue, 12 August 1997 00:00

davidf
Messages: 2866
Registered: September 1996

Senior Member

Roberto Racca writes:

> David Fanning <davidf@dfanning.com> wrote:
>
>> 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?

The problem with resizing draw widgets and the problems with
the Set_Draw_View keyword to Widget_Control are both known
problems. RSI engineers are currently researching the cause
of the problem, which I'm told has a high priority. They
expect to have the problem solved in the next release of IDL.

Information about this and other assorted behaviors in IDL 5
can be found on the IDL 5 Reports and Information page of
my web page.

Cheers,

David

------------------------------------------------------------ -----
David Fanning, Ph.D.
Fanning Software Consulting
Customizable IDL Programming Courses
Phone: 970-221-0438 E-Mail: davidf@dfanning.com
Coyote's Guide to IDL Programming: http://www.dfanning.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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