package {
    import flash.display.Sprite;
    import flash.events.Event;
    public class Walking1 extends Sprite {
        private var segment0:Segment;
        private var segment1:Segment;
        private var cycle:Number=0;
        private var offset:Number = -Math.PI/2;//小腿的运动看上去应该滞后于大腿，所以需要加入反向偏移量
         
        public function Walking1() {
            init();
            trace(Math.PI/180);
            trace(0.05*180/Math.PI);
        }
        private function init():void {
            segment0=new Segment(100,20);
            addChild(segment0);
            segment0.x=200;
            segment0.y=200;
            segment1=new Segment(100,20);
            addChild(segment1);
            segment1.x=segment0.getPin().x;
            segment1.y=segment0.getPin().y;
            addEventListener(Event.ENTER_FRAME,onEnterFrame);
        }
        private function onEnterFrame(event:Event):void {
            cycle+=.05;
            var angle0:Number=Math.sin(cycle)*45 + 90;//-45到45整体加上90度以后，就变成45到135，即：大腿垂直方向左右摆动45度
            var angle1:Number = Math.sin(cycle + offset) * 45  + 45;//即：小腿相对大腿末端做0-90度的正向旋转。建议大家尝试修改一下这里的+45值的大小，看看效果有什么不同
            segment0.rotation=angle0;
            segment1.rotation=segment0.rotation+angle1;
            segment1.x=segment0.getPin().x;
            segment1.y=segment0.getPin().y;
        }
    }
}