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
