The Draw dialect is quite extensive. In fact, too extensive for the scope of this notebook. I will study only the basics that allow to make useful programs and, if needed, to understand the complete documentation found on Red's documentation on draw.
I suggest you take a look at the excellent red-by-example.org page on draw. This chapter is made of my notes studying that page.
pen, fill-pen, color
Can't figure this one out...
Topics well explained at red-by-example.org page on draw.
I will not study them now...