How can I draw a circle with dashed line/stroke?

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 * Copyright maesy ( http://wonderfl.net/user/maesy )
 * MIT License ( http://www.opensource.org/licenses/mit-license.php )
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//How can I draw a circle with dashed line/stroke?
//Using a for cycle and using the equation of the circle wouldn't it be too slow?
package {
    import flash.display.Sprite;
    import flash.display.Shape;
    import flash.display.LineScaleMode;
    import flash.display.CapsStyle;
    import flash.display.JointStyle;

    public class DashedCircle extends Sprite {
        private var shape:Shape;
        
        
        public function DashedCircle() {
           circle();
        }
        
        private function circle():void{
            shape = new Shape();
            shape.graphics.beginFill(0xFF0000, 1);
            //Can i set a dashed line style?
	    shape.graphics.lineStyle(2, 0x000000, 1, true, LineScaleMode.NONE, CapsStyle.SQUARE, JointStyle.MITER, 3);
	    shape.graphics.drawCircle(x, y, int(stage.stageWidth / 2));
	    shape.graphics.endFill();
            this.addChild(shape);
            shape.x = stage.stageWidth/2;
            shape.y = stage.stageHeight/2;
        }
    }
}