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Re: Object Graphics [message #39387 is a reply to message #9626]

Tue, 11 May 2004 20:33

Mark Hadfield
Messages: 783
Registered: May 1995

Senior Member

Michael Wallace wrote:
...And for the curious, here's what RSI has
> to say about this buried way down in their documentation:
>
> In some situations, IDL cannot provide this backing store.
>
> In IDL Object Graphics, it is almost always best to disable backing
> store (that is, set the RETAIN property equal to zero). This is because
> drawing to an off-screen pixmap (which is what happens when backing
> store is enabled) almost always bypasses any hardware graphics
> acceleration that may be available, causing all rendering to be done in
> software. To ensure that windows are redrawn properly, enable the
> generation of expose events on the WIDGET_DRAW window and redraw the
> windows explicitly when an expose event is received.

Not true in my experience, though it depends on the graphics card &
settings (and heaven knows what else). With the not-very-cutting-edge
graphics system on my PC (Windows 2000) here are the settings that I
find the best:

RENDERER = 0 (hardware renderer--it is a little faster
than the software one)

RETAIN = 2

EXPOSE_EVENTS = RETAIN lt 2

--
Mark Hadfield "Ka puwaha te tai nei, Hoea tatou"
m.hadfield@niwa.co.nz
National Institute for Water and Atmospheric Research (NIWA)

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[Message index]

		Object Graphics By: Reinhold Kroll on Wed, 23 July 1997 00:00
		Re: Object Graphics By: Michael Wallace on Thu, 13 May 2004 08:10
		Re: Object Graphics By: Karl Schultz on Thu, 13 May 2004 07:17
		Re: Object Graphics By: Michael Wallace on Wed, 12 May 2004 14:14
		Re: Object Graphics By: Rick Towler on Wed, 12 May 2004 13:15
		Re: Object Graphics By: David Fanning on Wed, 12 May 2004 12:39
		Re: Object Graphics By: Michael Wallace on Wed, 12 May 2004 11:36
		Re: Object Graphics By: Rick Towler on Wed, 12 May 2004 10:25
		Re: Object Graphics By: marc schellens[1] on Wed, 12 May 2004 00:52
		Re: Object Graphics By: Mark Hadfield on Tue, 11 May 2004 20:33
		Re: Object Graphics By: Michael Wallace on Tue, 11 May 2004 19:42
		Re: Object Graphics By: David Fanning on Tue, 11 May 2004 18:12
		Re: Object Graphics By: Michael Wallace on Tue, 11 May 2004 18:06
		Re: Object Graphics By: Michael Wallace on Tue, 11 May 2004 17:58
		Re: Object Graphics By: David Fanning on Tue, 11 May 2004 16:18

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