/* 
 *  call-seq:
 *    draw_ellipse_a(center, radius, color)
 *
 *  Like #draw_ellipse, but the ellipse border is anti-aliased.
 */
VALUE rbgm_draw_aaellipse(VALUE target, VALUE center, VALUE radii, VALUE rgba)
{
  draw_ellipse(target,center,radii,rgba,1,0); /* aa, no fill */
  return target;
}