/* 
 *  call-seq:
 *    draw_polygon_a(points, color)
 *
 *  Like #draw_polygon, but the lines are anti-aliased.
 */
VALUE rbgm_draw_aapolygon(VALUE target, VALUE points, VALUE rgba)
{
  draw_polygon(target,points,rgba,1,0); /* aa, no fill */
  return target;
}