public static final void reverseWinding(List<Vector2> points){
  if (points == null)   throw new NullPointerException(Messages.getString("geometry.nullPointList"));
  int size=points.size();
  if (size == 1 || size == 0)   return;
  Collections.reverse(points);
}

public static final void reverseWinding ( List < Vector2 > points ) { if ( points == null ) throw new NullPointerException ( Messages . getString ( "geometry.nullPointList" ) ) ; int size = points . size ( ) ; if ( size == 1 || size == 0 ) return ; Collections . reverse ( points ) ; }
reverses the order of the polygon points within the given list . < p > this method performs a simple list reverse .
