package  {    import flash.display.MovieClip;    import flash.display.Graphics;    import flash.geom.Point;        public class Cirle extends MovieClip{    /**    *定义圆心（x0,y0），半径为r    */    public function OnMidpontcircle(g:Graphics,x0:int,y0:int,r:int):void     {       // TODO: Add your command handler code here        g.beginFill(0xff0000);              var x:int;        var y:int;        var d:int;           x=0;y=r;d=1-r;        //setPixel(x,y,color);        setPixel(x,y);           while(x<=y)           {              if(d<0) {                  d+=2*x+3;              }else {                  d+=2*(x-y)+5;y--;              }              x++;              setPixel(x+x0,y+y0);              setPixel(-x+x0,y+y0);              setPixel(-x+x0,-y+y0);              setPixel(x+x0,-y+y0);              setPixel(y+x0,x+y0);              setPixel(-y+x0,x+y0);              setPixel(-y+x0,-x+y0);              setPixel(y+x0,-x+y0);       }       g.endFill();    }    public function Cirle()     {        // constructor code        OnMidpontcircle(graphics,100,100,100);//10-40                    //graphics.beginFill(0xff0000,0.01);        graphics.lineStyle(1,0x00ff00);        graphics.drawRect(0,0,200,200);        graphics.endFill();    }            private function setPixel(x:int,y:int):void    {        graphics.drawRect(x,y,1,1);    }}}