[Groff] Polygons in pic

[Bill Ward]

The discussion of linecaps  for lines in polygons reminded me of something
on my wish list:

Since there is this powerful capability to draw (filled) polygons, how
difficult would it be to make this capability available in pic?  E.g.,

Mypoly: polygon from (1,1) to (3,1) to (3,3) to (2,4) to (1,3) to (1,1) \
        shaded "red"

Maybe even curved sides would be possible?

Bill Ward

> From: Werner LEMBERG <address@hidden>
> Date: Thu, 13 Jul 2006 21:54:08 +0200 (CEST)
> To: address@hidden
> Cc: address@hidden
> Subject: Re: [Groff] Rules drawn with \D are rounded
> 
> 
>> Yes. There are raw PostScript commands, 'setlinejoin', 'setlinecap'
>> and 'setmiterlimit' relevant to it (info quoted from the PostScript
>> Language Reference Manual or "Red Book"): [...good explanation
>> omitted...]
> 
> Ted, can you transform your explanation into a patch for grops.man?
> Be careful to use your own words for copyright reasons.
> 
>> For polygons (filled or unfilled), normally '0 setlinejoin'.  This
>> can produce unwanted results with sharp angles and thick lines, but
>> I can't otherwise think of a reason for using round joins as a
>> default nor for unfilled as opposed to filled polygons.
> 
> I hope that my other mail has explained this issue (this is, to draw
> both a filled and unfilled polygon).
> 
> 
>    Werner
> 
> 
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