In the mid 1980's I played a bit with MacPascal and wrote a simple thing
that overlaid XOR bitblt's of circles at random locations to create some
interesting (and rather paradoxical) visual effects.

 

Consider the file at http://theory.cs.uvic.ca/~cos/venn/gifs/anim-nc.gif as
discussed in http://theory.cs.uvic.ca/~cos/venn/VennWhatEJC.html . (It is a
symmetric alternative to Venn's original proof of the constructability of
Venn diagrams on N sets).

 

Can anyone think of a way to do this with successive overlays of filtered
SVG paths? It seems like feComposite with operator = xor ought to  do the
trick, but I haven't been able to get any browsers to do what I expect they
should.

 

Cheers

David



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