Accepted answer

Seems that it can be done by switching around the parameters. The d above, created by the hive plot algorithm turns out to be a moveto and a curveto (bezier) in the format M x y C x1 y1 x2 y2 x y.

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To reverse the curve, switching endpoint x,y in C with startpoint x,y in M and then switching the bezier control points x1,y1 with x2,y2 seems to do it.

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