| Re: cgColorBar greyscale [message #80289 is a reply to message #80287] |
Thu, 24 May 2012 05:43  |
David Fanning
Messages: 11724
Registered: August 2001
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Senior Member |
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Kai Muehlbauer writes:
> some part of the sky is falling on me while trying to do a scatterplot
> with an associated colorbar on a z-buffer device.
>
> Here is what I do (shorted):
>
> Problem is: The scatter plot has colors but the colorbar is only greyscale.
OK, the problem is complicated. :-)
I am not going to go into all of it, but you can learn
more about the problem by reading this article:
http://www.idlcoyote.com/cg_tips/configz.php
And, by reading the documentation header in SetDecomposedState.
Basically, the problem is this. The Z-Graphics buffer can
be put into 24-bit graphics mode, but it can't be taken
OUT of 24-bit graphics mode programmatically, without
destroying the functionality you are trying to make use of.
And, because a 20+ year effort to convince IDL users to
use something *other* than indexed color has been an
abject failure and caused me to retire prematurely, about
a year and a half ago I just threw up my hands and said
the hell with it, I wasn't going to worry about the Z-graphics
buffer anymore.
And, then you come along as this small ray of light!
So, bottom line, I had given up hope of anyone ever using
the Z-graphics buffer the way you are using it, and I had
written my programs, specifically, SetDecomposedState, with
this dispiriting hopelessness in mind. That was a mistake,
I see now. :-)
So, to solve your problem, get a new version of SetDecomposedState,
and you should be good to go:
http://www.idlcoyote.com/programs/setdecomposedstate.pro
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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