Hi,

I'm building a drawing application for the iPad and I'm having some problems
building erase into it. I'm using fillOval:fillStyle:
and drawPolygon:fillStyle: for drawing normally and I'd like to use the same
methods for erasing. Unfortunately, when I put in (Color transparent) as the
fillStyle, it doesn't do anything. I believe this is because it is acting as
a paint over combination rule. So, original + transparent = original. What I
want is that the transparent color takes the place of the original color.
Any advice on how to do this?

Thanks,

Jeff

-- 
Jochen "Jeff" Rick, Ph.D.
http://www.je77.com/
+44(0)1908 332 451 (work)
Skype ID: jochenrick
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