| Re: Has USERSYM been defined? [message #29586] |
Wed, 06 March 2002 04:40 |
R.Bauer
Messages: 1424
Registered: November 1998
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Senior Member |
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Wayne Landsman wrote:
>
> I think the answer to the following question is "no" but it is worth a
> shot.
>
> Is there any way to determine if a user-defined plotting symbol has
> been created using USERSYM for plotting with PSYM=8? (I suppose it
> might also be nice if one could determine what the user-defined symbol
> actually is, i.e. fetch the X,Y vectors that were input to USERSYM, but
> I don't need that now.)
>
> I want to have my plotting program use the current USERSYM definition
> for PSYM=8 if it exists, but to create a default symbol if no current
> USERSYM definition exists.
>
> Thanks, --Wayne Landsman landsman@mpb.gsfc.nasa.gov
We have solved this problem indirect by defining new number codes
for usersyms.
http://www.fz-juelich.de/icg/icg-i/idl_icglib/idl_source/idl _html/dbase/download/icgsym_n.tar.gz
icgsym_n,/symhelp ; shows all symbols
All usersyms are defined in this routines. e.g. 208 is a filled circle
If now a number gt 7 ne 10 is used it is a user defined symbol.
regards
Reimar
--
Reimar Bauer
Institut fuer Stratosphaerische Chemie (ICG-I)
Forschungszentrum Juelich
email: R.Bauer@fz-juelich.de
------------------------------------------------------------ -------
a IDL library at ForschungsZentrum Juelich
http://www.fz-juelich.de/icg/icg1/idl_icglib/idl_lib_intro.h tml
============================================================ =======
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| Re: Has USERSYM been defined? [message #29591 is a reply to message #29586] |
Tue, 05 March 2002 13:26  |
Liam E. Gumley
Messages: 378
Registered: January 2000
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Senior Member |
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Mark Hadfield wrote:
> "David Fanning" <david@dfanning.com> wrote in message
> news:MPG.16eebb31cf80510798982f@news.frii.com...
>> Wayne Landsman (landsman@mpb.gsfc.nasa.gov) writes:
>>
>>> Is there any way to determine if a user-defined plotting symbol has
>>> been created using USERSYM for plotting with PSYM=8? (I suppose it
>>> might also be nice if one could determine what the user-defined
>>> symbol actually is, i.e. fetch the X,Y vectors that were input to
>>> USERSYM, but I don't need that now.)
>>>
>
>>> I want to have my plotting program use the current USERSYM
>>> definition for PSYM=8 if it exists, but to create a default symbol
>>> if no current USERSYM definition exists.
>>
>
>> My impression is that the whole USERSYM business is a hold-over from
>> the way graphics were done in the 70's.
>
> Indeed.
>
>> I'd bet a lot of money the answer is "no". (Or, even more likely,
>> "hell no".)
>
> How much money, David?
>
> How about plotting a test dataset inside a CATCH handler and trapping
> the error? Attempting to display a user symbol that is not yet defined
> results (in IDL 5.5) in an error with name 'IDL_M_PLOT_NOUSERSYM'
The following function returns 1B (true) if the argument (a symbol
number) can be plotted, and 0B otherwise:
FUNCTION SYMBOL_DEFINED, PSYM
current_device = !d.name
catch, status
if (status ne 0) then begin
set_plot, current_device
return, 0B
endif
set_plot, 'NULL'
plots, 0, 0, psym=psym, /device
set_plot, current_device
return, 1B
END
IDL> print, symbol_defined(7)
1
IDL> print, symbol_defined(8)
0
IDL> x = [-6, 0, 6, 0, -6]
IDL> y = [0, 6, 0, -6, 0]
IDL> usersym, x, y
IDL> print, symbol_defined(8)
1
Cheers,
Liam.
Practical IDL Programming
http://www.gumley.com/
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| Re: Has USERSYM been defined? [message #29593 is a reply to message #29591] |
Tue, 05 March 2002 13:01 |
David Fanning
Messages: 11724
Registered: August 2001
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Senior Member |
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Mark Hadfield (m.hadfield@niwa.co.nz) writes:
> How about plotting a test dataset inside a CATCH handler and trapping
> the error? Attempting to display a user symbol that is not yet defined
> results (in IDL 5.5) in an error with name 'IDL_M_PLOT_NOUSERSYM'
Yeah, then you could use your pattern matching software (you
might have to write this yourself, but I'm sure it can be done
in IDL) to find out what symbol it was, and there you would have it.
> How much money, David?
Oh, gosh. Since it involves a computer, I'd be willing
to risk as much as a dollar. Guess that's about four
of yours, Mark. :-)
Cheers,
David
--
David W. Fanning, Ph.D.
Fanning Software Consulting
Phone: 970-221-0438, E-mail: david@dfanning.com
Coyote's Guide to IDL Programming: http://www.dfanning.com/
Toll-Free IDL Book Orders: 1-888-461-0155
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| Re: Has USERSYM been defined? [message #29594 is a reply to message #29593] |
Tue, 05 March 2002 12:47 |
Mark Hadfield
Messages: 783
Registered: May 1995
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Senior Member |
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"David Fanning" <david@dfanning.com> wrote in message
news:MPG.16eebb31cf80510798982f@news.frii.com...
> Wayne Landsman (landsman@mpb.gsfc.nasa.gov) writes:
>
>> Is there any way to determine if a user-defined plotting symbol has
>> been created using USERSYM for plotting with PSYM=8? (I suppose it
>> might also be nice if one could determine what the user-defined
>> symbol actually is, i.e. fetch the X,Y vectors that were input to
>> USERSYM, but I don't need that now.)
>>
>> I want to have my plotting program use the current USERSYM
>> definition for PSYM=8 if it exists, but to create a default symbol
>> if no current USERSYM definition exists.
>
> My impression is that the whole USERSYM business is a hold-over from
> the way graphics were done in the 70's.
Indeed.
> I'd bet a lot of money the answer is "no". (Or, even more likely,
> "hell no".)
How much money, David?
How about plotting a test dataset inside a CATCH handler and trapping
the error? Attempting to display a user symbol that is not yet defined
results (in IDL 5.5) in an error with name 'IDL_M_PLOT_NOUSERSYM'
---
Mark Hadfield
m.hadfield@niwa.co.nz Ka puwaha et tai nei
http://katipo.niwa.co.nz/~hadfield Hoea tatou
National Institute for Water and Atmospheric Research (NIWA)
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| Re: Has USERSYM been defined? [message #29602 is a reply to message #29594] |
Tue, 05 March 2002 10:24 |
David Fanning
Messages: 11724
Registered: August 2001
|
Senior Member |
|
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Wayne Landsman (landsman@mpb.gsfc.nasa.gov) writes:
> I think the answer to the following question is "no" but it is worth a
> shot.
>
> Is there any way to determine if a user-defined plotting symbol has
> been created using USERSYM for plotting with PSYM=8? (I suppose it
> might also be nice if one could determine what the user-defined symbol
> actually is, i.e. fetch the X,Y vectors that were input to USERSYM, but
> I don't need that now.)
>
> I want to have my plotting program use the current USERSYM definition
> for PSYM=8 if it exists, but to create a default symbol if no current
> USERSYM definition exists.
My impression is that the whole USERSYM business is
a hold-over from the way graphics were done in the 70's.
I'd bet a lot of money the answer is "no". (Or, even
more likely, "hell no".)
Cheers,
David
--
David W. Fanning, Ph.D.
Fanning Software Consulting
Phone: 970-221-0438, E-mail: david@dfanning.com
Coyote's Guide to IDL Programming: http://www.dfanning.com/
Toll-Free IDL Book Orders: 1-888-461-0155
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