用AS画图，自定义多边形及圆形-Flash教程

这两天在研究关于as画图的问题,经过一番折腾后终于是出来了,(部分代码来源于 programming macromedia flash mx)

AS:

MovieClip.prototype.drawRegAng = function(x, y, r, num, rotation) {
/*参数说明：x,y:多边形的中心坐标;r:多边形半径;num:多边形边数;最后一个是旋转角度*/
var tAngle = (rotation-90)*Math.PI/180;
var angle = 2*Math.PI/num;
var sin = Math.sin;
var cos = Math.cos;
num ;
this.moveTo(x r*cos(tAngle), y r*sin(tAngle));
while (num--) {
tAngle = angle;
this.lineTo(x r*cos(tAngle), y r*sin(tAngle));
}
};
this.createEmptyMovieClip(\"loader\", 100);
loader.lineStyle(0, 0x000000);
//初始化变量
var r=50,num=5,rota=0;
var x = Stage.width/2, y = Stage.height/2;
loader.drawRegAng(x, y, r, num, rota);

numChange=new Object();
numChange.change=function(evt){
num=evt.target.value;
}
rChange=new Object();
rChange.change=function(evt){
r=evt.target.value;
}
rotaChange=new Object();
rotaChange.change=function(evt){
rota=evt.target.value;
}
bian.addEventListener(\"change\",numChange);
jiaodu.addEventListener(\"change\",rotaChange);
banjing.addEventListener(\"change\",rChange);
function clicked(){
loader.clear();
loader.lineStyle(0, 0x000000);
loader.drawRegAng(x, y, r, num, rota);
}
rSubmit.addEventListener(\"click\",clicked);

圆形：

AS:
MovieClip.prototype.drawOval=function(x,y,rx,ry){
this.moveTo(x rx,y);
this.curveTo(rx x,0.4142*ry y,0.7071*rx x,0.7071*ry y);
this.curveTo(0.4142*rx x,ry y,x,ry y);
this.curveTo(-0.4142*rx x,ry y,-0.7071*rx x,0.7071*ry y);
this.curveTo(-rx x,0.4142*ry y,-rx x,y);
this.curveTo(-rx x,-0.4142*ry y,-0.7071*rx x,-0.7071*ry y);
this.curveTo(-0.4142*rx x,-ry y,x,-ry y);
this.curveTo(0.4142*rx x,-ry y,0.7071*rx x,-0.7071*ry y);
this.curveTo(rx x,-0.4142*ry y,rx x,y);
}