| Re: usersym keywords -- why? [message #63427] |
Tue, 11 November 2008 05:28  |
David Fanning
Messages: 11724
Registered: August 2001
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Senior Member |
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Reimar Bauer writes:
> Just a quick question why isn't it passed by _EXTRA ?
Oh, ok, *now* I see the point of that discussion
yesterday. Humm. Don't know. Let me go get some
coffee and think about it some. :-)
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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| Re: usersym keywords -- why? [message #63429 is a reply to message #63427] |
Tue, 11 November 2008 00:57  |
R.Bauer
Messages: 1424
Registered: November 1998
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Senior Member |
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David Fanning schrieb:
> Christopher Thom writes:
>
>> Debugging some code today, I discovered what I would consider to be
>> strange behaviour. Although...maybe this is a "feature". Consider the
>> following:
>>
>> usersym, [ -1, 0, 1, -1 ], [ 1, -1, 1, 1 ], thick = 20
>> plot, findgen(10), ps=8, thick = 2
>>
>> Is there any reason why usersym accepts thickness and color keywords? And,
>> more importantly, why the keywords passed to plot/oplot don't over-ride
>> them?
>>
>> I was using some symbols from the awesome symcat() library [thanks david!]
>> when I discovered this. The only workaround I could come up with was to
>> extend symcat() to accept and pass _extra keywords to usersym...which now
>> gives me the even more confusing:
>>
>> plot, findgen(10), ps = symcat(11, thick = 20), thick = 2
>>
>> If anyone can see a sane or (better!) elegant solution to the thickness
>> madness I've been having all afternoon, I'd love to hear of it.
>
> I can't really make out what you think the problem is.
> I think IDL is doing exactly the right and expected thing
> here: if I make a user symbol, I don't want someone outside
> messing around with it.
>
> Why did you have to extend SYMCAT? It already takes the THICK
> keyword.
>
> Cheers,
>
> David
>
Just a quick question why isn't it passed by _EXTRA ?
Reimar
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| Re: usersym keywords -- why? [message #63435 is a reply to message #63429] |
Mon, 10 November 2008 18:19 |
David Fanning
Messages: 11724
Registered: August 2001
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Senior Member |
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Christopher Thom writes:
> Debugging some code today, I discovered what I would consider to be
> strange behaviour. Although...maybe this is a "feature". Consider the
> following:
>
> usersym, [ -1, 0, 1, -1 ], [ 1, -1, 1, 1 ], thick = 20
> plot, findgen(10), ps=8, thick = 2
>
> Is there any reason why usersym accepts thickness and color keywords? And,
> more importantly, why the keywords passed to plot/oplot don't over-ride
> them?
>
> I was using some symbols from the awesome symcat() library [thanks david!]
> when I discovered this. The only workaround I could come up with was to
> extend symcat() to accept and pass _extra keywords to usersym...which now
> gives me the even more confusing:
>
> plot, findgen(10), ps = symcat(11, thick = 20), thick = 2
>
> If anyone can see a sane or (better!) elegant solution to the thickness
> madness I've been having all afternoon, I'd love to hear of it.
I can't really make out what you think the problem is.
I think IDL is doing exactly the right and expected thing
here: if I make a user symbol, I don't want someone outside
messing around with it.
Why did you have to extend SYMCAT? It already takes the THICK
keyword.
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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| 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
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Senior Member |
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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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