Re: undiagnosed pic error

[Oliver Corff]

Hi Doug,

I understand that groff has the \D escape which allows you, among other
things, to draw outline and filled polygons.

A polygon:

 '\D'p DX1 DY1 DX2 DY2 ...''

From the texinfo groff manual:

           Draw a polygon from the current location to the relative
          position (DX1,DY1) and then to (DX2,DY2) and so on. When the
          specified data points are exhausted, a line is drawn back to
          the starting point.

A solid polygon:

 '\D'P DX1 DY1 DX2 DY2 ...'

Is this of any help for your purpose?

Best regards,

Oliver.


On 04/06/2023 17:19, Douglas McIlroy wrote:
> Pic knows how to fill a box, a circle or an ellipse.
> Groff(7) says you can fill "closed drawn objects".
> So, on a whim, I tried to fill a triangle by drawing a closed line.
>
> .PS
> line from 0,0 to 0,1 to 1,1 to 0,0 fill 0.5
> .PE
>
> The line is drawn but not filled, and no diagnostic  is
> issued for the inapplicable "fill".
>
> A nice fix would be to make filled polygons work, perhaps
> with a keyword "polygon", which behaves like "line", but
> closes the figure automatically. Self-crossing polygons can
> be handled as in PostScript.
>
> A super-duper fix would support filling of closed curves made
> of lines, splines and arcs.
>
> In any event, it is wrong to silently ignore "fill".
>
> Doug
--

Dr. Oliver Corff
Wittelsbacherstr. 5A
10707 Berlin
G E R M A N Y
Tel.: +49-30-85727260
Mail:oliver.corff@email.de