Point<T> operator *(num factor)

Scale this point by factor as if it were a vector.

Important Note: This function accepts a num as its argument only so that you can scale Point<double> objects by an int factor. Because the star operator always returns the same type of Point that originally called it, passing in a double factor on a Point<int> causes a runtime error in checked mode.

Source 

Point<T> operator *(num/*T|int*/ factor) {
  return new Point<T>(
      (x * factor) as dynamic/*=T*/, (y * factor) as dynamic/*=T*/);
}