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Re: Exceed and IDL [message #16189 is a reply to message #16186]

Thu, 08 July 1999 00:00

Mark Hadfield
Messages: 783
Registered: May 1995

Senior Member

David Fanning <davidf@dfanning.com> wrote in message
news:MPG.11ed28f44513782f989815@news.frii.com...
> Several obtuse reasons for setting RETAIN=0 in a draw widget
> come immediately to mind:
>
> (1) You are using object graphics in the window, in which
> case RETAIN should *always* be set to 0.

I disagree. For object graphics draw widgets on Windows NT, I have found the
best results (fast drawing, fast refresh when a window is re-exposed) are
achieved with:

RENDERER = 0 ; "Hardware" renderer
RETAIN=2 ; IDL provides backing store
EXPOSE_EVENTS=0 ; Not necessary for widget application to redraw its
own windows

I imagine that other platforms have different optimum settings, but you use
NT primarily, don't you David?

--
Mark Hadfield m.hadfield@niwa.cri.nz
National Institute for Water and Atmospheric Research
PO Box 14-901, Wellington, New Zealand

>
> (2) You know how screwy colors can be and you wish to
> protect the colors associated with this application
> by "restoring" your colors every time the widget is
> exposed.
>
> Cheers,
>
> David
>
> --
> David Fanning, Ph.D.
> Fanning Software Consulting
> Phone: 970-221-0438 E-Mail: davidf@dfanning.com
> Coyote's Guide to IDL Programming: http://www.dfanning.com/
> Toll-Free IDL Book Orders: 1-888-461-0155

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[Message index]

		Re: Exceed and IDL By: meron on Thu, 08 July 1999 00:00
		Re: Exceed and IDL By: Mark Hadfield on Thu, 08 July 1999 00:00
		Re: Exceed and IDL By: Mark Hadfield on Thu, 08 July 1999 00:00
		Re: Exceed and IDL By: davidf on Wed, 07 July 1999 00:00
		Re: Exceed and IDL By: Richard G. French on Wed, 07 July 1999 00:00
		Re: Exceed and IDL By: Liam Gumley on Wed, 07 July 1999 00:00
		Re: Exceed and IDL By: davidf on Wed, 07 July 1999 00:00
		Re: Exceed and IDL By: bkrrrrr on Wed, 07 July 1999 00:00
		Re: Exceed and IDL By: Liam Gumley on Wed, 07 July 1999 00:00
		Re: Exceed and IDL By: bkrrrrr on Tue, 06 July 1999 00:00
		Re: Exceed and IDL By: Liam Gumley on Tue, 06 July 1999 00:00
		Re: Exceed and IDL By: Liam Gumley on Tue, 06 July 1999 00:00
		Re: Exceed and IDL By: Barry Latter on Tue, 06 July 1999 00:00
		Re: Exceed and IDL By: davidf on Mon, 05 July 1999 00:00

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