A move_point is a point of a path that is reached without drawing, starting a new sub-path. Sub-paths allow for shapes with holes:
new(P, path),
send_list(P, append, [ point(0,0), point(100,0), point(100,100),
point(0,100), move_point(25,25), point(75,25),
point(75,75), point(25,75) ]),
send(P, closed, @on),
send(P, fill_rule, even_odd),
send(P, fill, colour(orange)).
See also class path
and path<-fill_rule.
<-closed).
Defaults: @nil