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Probably the right curve was a circle's involute. "...Its successive turns are parallel curves with constant separation distance..." Not sure how this can be proven, but this seems to fit well with the concept of stroked path -as parallel curves at it's edges-. Mathematical functions for the parametric curve is x=a*(cos(t) t*sin(t)) y=a*(sin(t)-t*cos(t)) More info here: http://en.wikipedia.org/wiki/Involute. Probably the right

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X=a*(cos(t) t*sin(t)) y=a*(sin(t)-t*cos(t)). Xacosttsintyasinttcost

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