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

[<mj...@ga...>]

Alan W. Irwin writes:
 > On 2004-11-12 08:50+0100 Lehmann, Eckhard {TR-I~Penzberg} wrote:
 > 
 > >
 > >> This is documented in
 > >>
 > > http://plplot.sourceforge.net/docbook-manual/plplot-html-5.3.1/color.htm
 > > l .
 > >
 > > I've read this documentation already and tried to set up the colors
 > > according to this:
 > >
 > > tclsh> package require Plplotter
 > > tclsh> plframe .f
 > > tclsh> .f cmd plscol0 0 255 255 255 ;# set color at index 0 to white
 > > Couldn't parse color 255
 > 
 > I am not expert in tcl, but none of examples/tcl/x??.tcl have commands with
 > the trailing semicolon followed by commentary that you put in the above
 > command, and my guess is that (the semicolon) is causing the parse error.
 > >From your later message it appears you have independently arrived at a
 > similar conclusion.

The ';#' syntax is customary in Tcl to safely allow comments at the end of a
line of code.  Otherwise sometimes the comment gets tangled up in the parsing
of the command line.  The ';' terminates the previous command to ensure this
doesn't ever happen.

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;
    }

-- 
Maurice LeBrun    mj...@ga...