D = region (D, R) appends the geom.Region R. It is drawn as its loops, the outline and every hole, and kept as one region, so a plate and its bores stay one entity:

 R = geom.Region ([0, 0; 60, 0; 60, 40; 0, 40], ...
                  {[20, 20, 1; 40, 20, 1]});
 D = draw.Drawing ().region (R);

To fill a region as well, use hatch.

A drawing is flat, so R must lie in its xy plane. Its geom.UCS may have its own origin and x axis there and may face down: the drawing keeps the same region, re-expressed in its own coordinates.

See also: geom.Region, hatch, polyline

Source Code: draw.Drawing