fill_polygon_relative(+Drawable, +Points, +Shape) fill_polygon_relative(+Drawable, +Gc, +Points, +Shape)
Draw a filled polygon. Points is a list of
each specifying the location of one vertex of the polygon relative
to the previous point.
Shape is either
complex, meaning the polygon
may contain intersecting edges,
nonconvex, meaning no edges
convex, meaning that no edges intersect, and further,
the polygon is wholly convex.