drawon is used to draw on another Turtle or Sprite.
It can be used to create your own turtle shapes.
t or other element can draw on Sprite
s = new Sprite color: gray t = new Turtle t.drawon s t.dot red, 100 t.pen blue, 10 t.fd 100 t.pen null t.ht() sync s, t s.lt 90 s.fd 200
Be sure to wait for the drawing to finish before you
start moving the Sprite that is being drawn. You
can do this by drawing at
t.speed Infinity or by
sync to synchronize the objects.