Shapeから取得したPathIteratorに沿って図形を移動する

PathIterator pi = shape.getPathIterator(null, .01);
Point2D prev = new Point2D.Double();
double delta = .02;
double threshold = 2d;
double[] coords = new double[6];
while (!pi.isDone()) {
  int segment = pi.currentSegment(coords);
  Point2D current = createPoint(coords[0], coords[1]);
  if (segment == PathIterator.SEG_MOVETO) {
    points.add(current);
    prev.setLocation(current);
  } else if (segment == PathIterator.SEG_LINETO) {
    double distance = prev.distance(current);
    double fraction = delta;
    if (distance > threshold) {
      Point2D p = interpolate(prev, current, fraction);
      while (distance > prev.distance(p)) {
        points.add(p);
        fraction += delta;
        p = interpolate(prev, current, fraction);
      }
    } else {
      points.add(current);
    }
    prev.setLocation(current);
  }
  pi.next();
}