package {
    import flash.display.Sprite;
    import flash.events.Event;
    public class Walking5 extends Sprite {
        private var segment0:Segment;
        private var segment1:Segment;
        private var segment2:Segment;
        private var segment3:Segment;
        private var speedSlider:SimpleSlider;
        private var thighRangeSlider:SimpleSlider;
        private var thighBaseSlider:SimpleSlider;
        private var calfRangeSlider:SimpleSlider;
        private var calfOffsetSlider:SimpleSlider;
        private var cycle:Number=0;
         
        public function Walking5() {
            init();
        }
 
        private function init():void {
            segment0=new Segment(100,30);
            addChild(segment0);
            segment0.x=200;
            segment0.y=100;
            segment1=new Segment(100,20);
            addChild(segment1);
            segment1.x=segment0.getPin().x;
            segment1.y=segment0.getPin().y;
            segment2=new Segment(100,30);
            addChild(segment2);
            segment2.x=200;
            segment2.y=100;
            segment3=new Segment(100,20);
            addChild(segment3);
            segment3.x=segment2.getPin().x;
            segment3.y=segment2.getPin().y;
             
            //控制速度的滑块
            speedSlider=new SimpleSlider(0,0.5,0.11);
            addChild(speedSlider);
            speedSlider.x=10;
            speedSlider.y=10;
             
            //控制大腿能分开的最大角度
            thighRangeSlider=new SimpleSlider(0,90,45);
            addChild(thighRangeSlider);
            thighRangeSlider.x=30;
            thighRangeSlider.y=10;
             
            //大腿旋转的偏移量
            thighBaseSlider=new SimpleSlider(0,180,90);
            addChild(thighBaseSlider);          
            thighBaseSlider.x=50;
            thighBaseSlider.y=10;
             
            //小腿旋转的偏移量
            calfRangeSlider=new SimpleSlider(0,90,45);
            addChild(calfRangeSlider);          
            calfRangeSlider.x=70;
            calfRangeSlider.y=10;
             
            //小腿相对大腿滞后的偏移量
            calfOffsetSlider=new SimpleSlider(-3.14,3.14,-1.57);
            addChild(calfOffsetSlider);         
            calfOffsetSlider.x=90;
            calfOffsetSlider.y=10;
 
            addEventListener(Event.ENTER_FRAME, EnterFrameHandler);
        }
         
        private function EnterFrameHandler(e:Event):void {
            walk(segment0, segment1, cycle);
            walk(segment2, segment3, cycle + Math.PI);
            cycle+=speedSlider.value;
        }
        private function walk(segA:Segment, segB:Segment,cyc:Number):void {
            var angleA:Number = Math.sin(cyc) * thighRangeSlider.value + thighBaseSlider.value;
            var angleB:Number = Math.sin(cyc +calfOffsetSlider.value) * calfRangeSlider.value + calfRangeSlider.value;
            segA.rotation=angleA;
            segB.rotation=segA.rotation+angleB;
            segB.x=segA.getPin().x;
            segB.y=segA.getPin().y;
        }
    }
}