效果演示：

话不多说，参考代码中的注释

var pice = 8;

//瓣数

var amp = 180;

//半径

x0 = 550/2;

//中心X坐标

y0 = 400/2;

//中心Y坐标

degree = 0;

//初始角

speed = 2;

//画线速度

colorF = 0xFF0000;

//线条颜色

_root.createEmptyMovieClip("flower", 1);

//创建MC

with (flower) {

flower.moveTo(x0+amp, y0);

//移动起始点

flower.lineStyle(3, colorF, 100);

//定义线条样式

}

flower.onEnterFrame = function() {

//开始画线

if (degree<=360) {

for (i=1; i<=speed; i++) {

radian = Math.PI/180*(degree);

p = amp*Math.cos(pice/2*radian);

x = x0+p*Math.cos(radian);

y = y0+p*Math.sin(radian);

this.lineTo(x, y);

degree++;

}

}

};