画扇形

import flash.display.MovieClip;
import flash.display.Sprite;
var stag:Sprite=new Sprite();
addChild(stag);
var moviec:MovieClip = new MovieClip  ;
stag.addChild(moviec);
var S_angle:int = 60;

DrawSector(moviec,200,200,100,S_angle,270,0xffcc00);
function DrawSector(mc:MovieClip,x:Number=200,y:Number=200,r:Number=100,   
angle:Number=27,startFrom:Number=270,color:Number=0xff0000):void
{
    mc.graphics.beginFill(color,50);

    mc.graphics.lineStyle(0,0xff0000);
    mc.graphics.moveTo(x,y);
    angle=(Math.abs(angle)>360)?360:angle;
    var n:Number = Math.ceil(Math.abs(angle) / 45);
    var angleA:Number = angle / n;
    angleA = angleA * Math.PI / 180;
    startFrom = startFrom * Math.PI / 180;
    mc.graphics.lineTo(x+r*Math.cos(startFrom),y+r*Math.sin(startFrom));
    for (var i=1; i<=n; i++)
    {
        startFrom +=  angleA;
        var angleMid = startFrom - angleA / 2;
        var bx = x + r / Math.cos(angleA / 2) * Math.cos(angleMid);
        var by = y + r / Math.cos(angleA / 2) * Math.sin(angleMid);
        var cx = x + r * Math.cos(startFrom);
        var cy = y + r * Math.sin(startFrom);
        mc.graphics.curveTo(bx,by,cx,cy);
    }
    if (angle != 360)
    {
        mc.graphics.lineTo(x,y);
    }

    mc.graphics.endFill();
}