What an elegant and simple algorithm!  I can see that all you need is a
simple rule:  from a starting position, generate n cells such that from cell 0
to cell n/2, you make a 90 degree turn in uniform steps, then "unturn" the same
way until n.
    Once the first row is done, use each cell as the seed for the column using
the same algorithm.  I like it!

Cheers!

Chip Shults
My robotics, space and CGI web page - http://home.cfl.rr.com/aichip

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