Re: [Plplot-general] RE: Colors (was: no subject)

[Alan W. I. <ir...@be...>]

On 2004-11-13 08:15-0800 Alan W. Irwin wrote:

> On 2004-11-13 00:50-0600 mj...@ga... wrote:
>
>> 
>> As for the widget command syntax, it's:
>> 
>> <widget> scol0 <i> <color>
>> 
>> where <color> is any form suitable to XParseColor().
>> 
>> E.g. from plframe.c --
>> 
>>    if ( ! XParseColor(plFramePtr->display,
>>                       Tk_Colormap(plFramePtr->tkwin), col, &xcol)) {
>>        Tcl_AppendResult(interp, "Couldn't parse color ", col,
>>                         (char *) NULL);
>>        return TCL_ERROR;
>>    }
>
> Is this interpretation also correct for the pure tcl case, i.e., when
> you aren't using X and you are using, for example, the postscript device?

I just looked a bit further into this, and plscol0 appears to be defined
properly in bindings/tcl/tclgen.c to take 4 character arguments which are
converted to integers using atoi.  And if it doesn't have 4 arguments it
complains.  So this gets curiouser and curiouser since 4 arguments
apparently do not work and the construct (with two arguments)

.f cmd plscol0 0 white

does work. I presume this is one of those cases (which I thought we had
sorted out some time ago) where there is a nameclash so the tcl API in
tclgen.c is hijacked with something else.

Maurice, once you figure this out, I hope you change things so for all 
commands in the tcl interface (and also for the separate plframe interface
that is nameclashing with it) a single-colour argument like "white" is
accepted (since that is useful) as well as the 3-argument (r g b) form
(since that is the expected form if you generalize from the C API).

Alan
__________________________
Alan W. Irwin
email: ir...@be...
phone: 250-727-2902

Astronomical research affiliation with Department of Physics and Astronomy,
University of Victoria (astrowww.phys.uvic.ca).

Programming affiliations with the FreeEOS equation-of-state implementation
for stellar interiors (freeeos.sf.net); PLplot scientific plotting software
package (plplot.org); the Yorick front-end to PLplot (yplot.sf.net); the
Loads of Linux Links project (loll.sf.net); and the Linux Brochure Project
(lbproject.sf.net).
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