Glimmr Simple Graphics Window
version 1/100805 by Erik Temple
Section - Very basic drawing rule (for use without Glimmr Canvas-Based Drawing by Erik Temple)
[If we aren't using Canvas-Based Drawing, then we want to provide a stub rule, one that everyone is likely to use. This will clear the window to its background color, and we can add any rule we wish after it to actually do something.]
First window-drawing rule for the graphics-window (this is the clear the graphics-window rule):
clear the graphics-window.