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Replace teh-chin with ramer-douglas-peucker
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I think my implementation of this algorithm is broken. It does
something, but the output looks bad.
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We initially used Cairo for its bezier flattening algorithm. That
algorithm turned out to be a bit too imprecise at the scales we're
working at here (#17), so I ended up porting over some code from
Antigrain Graphics. The only other thing we used Cairo for was debug
output and coordinate transforms, so I just wrote the relevant vector
math in a small header file, deleted all debug output code and thus
eliminated the cairo dependency. This is a step towards Windows builds.
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This also fixes an issue where non-closed curves were not dilated
properly.
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