极坐标在绘画方法中的运用

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 ; } } };