static L<PolarPt> onePathToPolarIntervals_v1(OnePath path, int nIntervals) {
  if (path == null) null;
  L<PolarPt> out = emptyList(nIntervals);
  int iPath = 0, lPath = path.size();
  double step = lPath/nIntervals;
  var it = path.pointIterator();
  Pt p = it.next(), lastPoint = p;
  for i to nIntervals: {
    int iPath2 = iround((i+1)*step);
    while (iPath < iPath2) {
      p = it.next();
      iPath++;
    }
    out.add(PolarPt(p.minus(lastPoint)));
    lastPoint = p;
  }
  ret out;
}