method deltaTransformPoint

Source

Point<num> deltaTransformPoint(math.Point<num> point, [Point<num> returnPoint]) {

  var px = point.x.toDouble();
  var py = point.y.toDouble();
  var tx = px * this.a + py * this.c;
  var ty = px * this.b + py * this.d;

  if (returnPoint is Point) {
    returnPoint.setTo(tx, ty);
    return returnPoint;
  } else {
    return new Point<num>(tx, ty);
  }
}