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Using 4th degree bezier curves, you can create smooth curves given a path and some control points. A handy interface makes editing the paths (hopefully) simple. Left click to drag points around. You can right click to separate the control points from the path points.
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2013/4/9
2013/4/9
2013/4/9
2013/4/9
2013/4/9
2013/4/9
2013/5/29
2013/5/29
2013/5/29