involute of a circle
by Lazur - uploaded on October 11, 2014, 8:51 pm
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
More info here: