improve snapping algorithm#726

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leejjoon wants to merge 2 commits intomatplotlib:masterfrom

leejjoon:improve-agg-snapping

Commits on Feb 28, 2012

improve snapping algorithm
leejjoon
committed

Commits on Feb 29, 2012

add offset of 0.5 when marker is stroked so that snapping works better in agg backend
leejjoon
committed