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//已知中心点坐标，水平半径rx，垂直半径ry，绘制椭圆
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);
};
//已知坐标,半径，绘制一个圆
MovieClip.prototype.drawCircle=function(x,y,r){
    this.drawOval(x,y,r,r);
};