- distance
- The distance along the current contour to sample
- pos
- If not null, eturns the sampled position (x==[0], y==[1])
- tan
- If not null, returns the sampled tangent (x==[0], y==[1])
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Pins distance to 0 <= distance <= getLength(), and then computes the corresponding position and tangent. Returns false if there is no path, or a zero-length path was specified, in which case position and tangent are unchanged.