Proof of concept !!! Created the attached image from this jiffle 'program'...
xc = width() / 2; yc = height() / 2; dx = (x()-xc)/xc; dy = (y()-yc)/yc; d = sqrt(dx^2 + dy^2); result = sin(8 * PI * d); Happy :-) Michael
<<attachment: jiffledemo.gif>>
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