Container.paint calls create and dispose,
for a separate g to clip and position each child
and then restore larger clip and original coordinates
by disposing of the smaller g and using the original g.
Draws an arc bounded by the specified rectangle from startAngle to
endAngle. 0 degrees is at the 3-o'clock position.Positive arc
angles indicate counter-clockwise rotations, negative arc angles are
drawn clockwise.
MGH added setClip (x y w h) per 1.1 API,
this is supposed to be **NEW** Clip,
rather than intersection with existing Clip,
but that may not be correct yet..