public function bezierCurveTo($cp1x, $cp1y, $cp2x, $cp2y, $x, $y)
 {
     if (self::DEBUG) {
         echo __FUNCTION__ . "\n";
     }
     $this->canvas->curveto($cp1x, $cp1y, $cp2x, $cp2y, $x, $y);
 }