title: Get position of path at time
body: <p>is there a nice way to calculate the position of a path (CGPath or UIBezierPath) at a given time (from 0 to 1)?</p>
  
  <p>Using CAShapeLayer for example, one can create an animated stroke end.
  I want to know the position of that stroke end at arbitrary times.</p>
  
  <p>Thanks in advance, Adrian</p>