le 2001/10/30 0:00, Ashley Butterworth à macbse@... a écrit :

> Any suggestions on why this is happening and how I can fix it. I have a
> demonstration of this program on Thursday and would like to fix it before
> then.

it is necessary to set the colors in the gworld and the window where you
will be drawing, to white background and black fore, before doing any
drawing. this is a frequent problem.

try: forecolor( _zBlack) : backcolor( _zWhite)
[from memory]
before any drawing.

hth
:-j