| Coyote Graphics Update, Feb 4 [message #74888] |
Fri, 04 February 2011 14:21 |
David Fanning
Messages: 11724
Registered: August 2001
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Senior Member |
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Folks,
I can't remember if I announced this or not, probably
not, but because of the way resizeable graphics windows
work it becomes even more important than usual that
graphics display programs be able to "use" their own
colors, independent of the hardware color table.
To this end, I have added a PALETTE keyword to
cgImage, cgContour, cgSurf, and cgColorbar (and
their recently retired predecessors, for that
matter) that allows you to pass a color table
palette into the program. A palette is more
convenient than a color table index number,
because you are not then limited to IDL's color
tables, which I seldom use anymore for real
work. :-)
The easiest way to get a palette is from
cgLoadCT and the RGB_Table keyword. Obtained
in this way, no colors are actually loaded in
the hardware color table:
IDL> cgLoadCT, 5, RGB_TABLE=stdgammaPal
IDL> cgLoadCT, 4,/Brewer, /Reverse, RGB=brewerPal
These palettes can then be passed to any of these
four programs and they will do the right thing
with them. At the moment cgContour and cgColorbar
will sample colors from these color palette vectors
to do their thing. I understand this makes it difficult
to specify things like out-of-bounds and missing colors,
but I am working on a solution to that problem and
will announce it shortly. One step at a time. :-)
Naturally, you don't have to use a palette. And if
you don't, these programs will continue to work
as they always have.
Also, there was some mention about "loading" commands
into the cgWindow without immediately executing
all the other commands in the window. Rather than
add a third keyword to all the Coyote Graphics
commands, (as soon as I did, someone would recognize
the need for a fourth and fifth keyword, sure enough!),
I decided to add a window control that that can easily
be turned off with cgControl. The sequence of commands
you use to "load" commands without seeing them flash in the
window now looks like this:
cgWindow
cgControl, Execute=0
.... Load all your commands here.
cgControl, Execute=1
Now your window works normally.
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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