Somewhat less 8-bit hachures

The previous version was biased toward diagonals because it didn't take into account that diagonal movement from each point is a longer distance than moving straight up, down, left, or right, and that therefore it shouldn't move that way unless the drop is sqrt(2) as long in that direction. This also comes out a little darker because it is only invalidating a circle around each point instead of a square.

 

Better viewed large.

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Uploaded on April 21, 2012