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Re: Object Graphics [message #39389 is a reply to message #9626]

Tue, 11 May 2004 18:12

David Fanning
Messages: 11724
Registered: August 2001

Senior Member

Michael Wallace writes:

> So, is seeing something on the display 30
> minutes after you look at your first object graphics code somewhere
> close to a world record?

Pretty much. You were smart to choose a line and not
an image. Most people just starting out stare at
the first pixel of their image looming large on
their display for *days* before they figure it out. :-)

>> I'd try setting the RETAIN keyword to 2 and see if
>> that helps.
>
> Already was. And I can definitely tell you that the Window is not
> retaining anything. Direct graphics windows just like they're supposed
> to in the retain retain department.

Well, you can make the argument that retaining an object
graphics window is a gross misuse of the Earth's resources.
Why retain? You have the whole damn graphics hierarchy
already in memory. When you get an EXPOSE event in your
draw widget, just re-draw the graphics.

That's what you *had* to do when object graphics were
first released, although they have become more user
friendly over the years. (To much chagrin in the IEPA,
I can tell you!) You can think of this (if you choose,
of course) as your machine wanting to force you into
good programming practices. Those of us with Windows
machines will be drooling at your good luck! :-)

Cheers,

David

--
David Fanning, Ph.D.
Fanning Software Consulting
Coyote's Guide to IDL Programming: http://www.dfanning.com/

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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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