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Re: What am I doing wrong with al_legend? [message #78714 is a reply to message #78713]

Tue, 13 December 2011 13:12

David Fanning
Messages: 11724
Registered: August 2001

Senior Member

Brian Wolven writes:

> I think this is a case where the keyword arguments are being passed by reference rather than value, then modified in the legend routine, which propagates back to the calling routine. I'm not using the cg* and al* flavors of these routines, but had something similar happen with an older version of legend recently. Your modification is one way to work around the problem.

I think it really has to do with the fact that keyword
values get "frozen" by necessity when they are added
to cgWindow. This code, for example, worked perfectly
well in a normal IDL graphics window. But, when added to
cgWindow, the PSYM value is frozen at 8, meaning use the
user defined symbol, and because there is *only* one user
defined symbol allowed at any particular time, it uses
the last one.

The work-around is to put any of these "dynamic"
determinations of keyword or parameter values inside
the program "command" that is being executed. That
way the actual value can be determined when the command
is executed from inside cgWindow.

In other words, let AL_LEGEND figure out what symbol
to use internally, rather than telling it what symbol
to use from outside the program.

Or, something like that. It hurts my head to think
about it. :-(

Cheers,

David

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

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[Message index]

		Re: What am I doing wrong with al_legend? By: Avian on Tue, 13 December 2011 13:14
		Re: What am I doing wrong with al_legend? By: David Fanning on Tue, 13 December 2011 13:12
		Re: What am I doing wrong with al_legend? By: Brian Wolven on Tue, 13 December 2011 12:52
		Re: What am I doing wrong with al_legend? By: David Fanning on Tue, 13 December 2011 12:40
		Re: What am I doing wrong with al_legend? By: David Fanning on Tue, 13 December 2011 12:29
		Re: What am I doing wrong with al_legend? By: Avian on Tue, 13 December 2011 11:59
		Re: What am I doing wrong with al_legend? By: David Fanning on Tue, 13 December 2011 11:43
		Re: What am I doing wrong with al_legend? By: Avian on Tue, 13 December 2011 11:24
		Re: What am I doing wrong with al_legend? By: David Fanning on Tue, 13 December 2011 11:13
		Re: What am I doing wrong with al_legend? By: Avian on Tue, 13 December 2011 10:40
		Re: What am I doing wrong with al_legend? By: David Fanning on Tue, 13 December 2011 10:20

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