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Re: Arithmetic Errors Windows 64-bit Object Graphics [message #69151 is a reply to message #69149]

Fri, 11 December 2009 08:17

David Fanning
Messages: 11724
Registered: August 2001

Senior Member

David Fanning writes:

> OK, this turns out to be a problem with the RETAIN=2
> keyword on the Draw Widget. For some reason, with
> IDL maintaining the backing store on 64-bit Windows
> versions, an error is thrown. I'll report it to ITTVIS.

One more update. I can fix this problem in either of
two ways. I can use software rendering instead of
hardware rendering, which fixes it for *me* if not
for the rest of the world. Or, I can do my own backing
store by using EXPOSE events. This is how I used to do
all my object graphics programs and the code is already
in place to do this, so this is how I'll fix this.

I'm told this kind of exception is extremely common
with hardware rendering of object graphics code. So
much so, that a great deal of code exists that turns
off exception handling when calling the Draw method
on IDLgrWindows. (Perhaps the reason we don't see the
problem in iTools. :-)

PRO CallDrawMethodWithoutErrors, thisWindow, thisView

exceptSave = !Except
!Except = 0
thisWindow-> Draw, thisView
dummy = Check_Math()
!Except = exceptSave

END

Cheers,

David

--
David Fanning, Ph.D.
Fanning Software Consulting, Inc.
Coyote's Guide to IDL Programming: http://www.dfanning.com/
Sepore ma de ni thui. ("Perhaps thou speakest truth.")

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[Message index]

		Re: Arithmetic Errors Windows 64-bit Object Graphics By: R.Bauer on Thu, 17 December 2009 00:05
		Re: Arithmetic Errors Windows 64-bit Object Graphics By: Kenneth P. Bowman on Fri, 11 December 2009 11:56
		Re: Arithmetic Errors Windows 64-bit Object Graphics By: David Fanning on Fri, 11 December 2009 11:02
		Re: Arithmetic Errors Windows 64-bit Object Graphics By: Karl[1] on Fri, 11 December 2009 10:36
		Re: Arithmetic Errors Windows 64-bit Object Graphics By: David Fanning on Fri, 11 December 2009 08:38
		Re: Arithmetic Errors Windows 64-bit Object Graphics By: Kenneth P. Bowman on Fri, 11 December 2009 08:11
		Re: Arithmetic Errors Windows 64-bit Object Graphics By: David Fanning on Fri, 11 December 2009 08:17
		Re: Arithmetic Errors Windows 64-bit Object Graphics By: David Fanning on Fri, 11 December 2009 08:00
		Re: Arithmetic Errors Windows 64-bit Object Graphics By: Kenneth P. Bowman on Thu, 17 December 2009 13:04

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