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Re: usersym keywords -- why? [message #63569 is a reply to message #63429]

Tue, 11 November 2008 07:13

David Fanning
Messages: 11724
Registered: August 2001

Senior Member

Reimar Bauer writes:

> Just a quick question why isn't it passed by _EXTRA ?

The keywords THICK and COLOR are not passed by _EXTRA because
if you use them on the IDL command line, they are not "extra":

Plot, data, PSYM=SYMCAT(4), THICK=2, COLOR=200

Thus, I can't get them inside my program. But, that said,
I can understand some of Chris's confusion, because the
THICK keyword only applies to symbols I can create with
USERSYM. (Any symbol where I have to "lift the pen" to
draw cannot be created in USERSYM, such as a plus sign
or an asterisk.)

In fooling around with this today, I realized that if I
had added the COLOR keyword, too, I would have something
that was even more powerful, so I have done that:

http://www.dfanning.com/programs/symcat.pro

This gives me the ability to independently set the
thickness of the line, and the thickness of the symbols
(at least for those symbols I can render with USERSYM):

Plot, findgen(11), THICK=1, PSYM=-SYMCAT(4, THICK=2)

and it gives me the opportunity to draw the line in one color
and the symbols with another, without having to do this on
two separate calls:

yellow = FSC_Color('yellow')
green = FSC_Color('green')
Plot, Findgen(11), Color=yellow, PSYM=-SYMCAT(4, COLOR=green)

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: usersym keywords -- why? By: David Fanning on Tue, 11 November 2008 05:28
		Re: usersym keywords -- why? By: R.Bauer on Tue, 11 November 2008 00:57
		Re: usersym keywords -- why? By: David Fanning on Mon, 10 November 2008 18:19
		Re: usersym keywords -- why? By: David Fanning on Tue, 11 November 2008 07:13

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