模拟自由落体程序

package
{
    import com.phyics.CircleBoll;

    import flash.display.Sprite;
    import flash.events.Event;
    import flash.events.MouseEvent;
    import flash.events.TimerEvent;
    import flash.text.TextField;
    import flash.utils.Timer;

    [SWF(width="1000", height="800", frameRate="30")]
    public class woodBoll extends Sprite
    {

        private var bottom:uint=600;
        private var gravity:uint=10;
        private var _bollTimer:Timer=new Timer(60, 300);

        public function woodBoll():void
        {
            if (stage)
                init();
            else
                addEventListener(Event.ADDED_TO_STAGE, init);
        }

        //private var _bottomLine:Sprite=new Sprite();

        private function init(event:Event=null):void
        {
            removeEventListener(Event.ADDED_TO_STAGE, init);
            //var _bottomLine:Sprite=new Sprite();
            var _bottomLine:Sprite=new Sprite();
            _bottomLine.graphics.lineStyle(3);
            _bottomLine.graphics.moveTo(0, 600);
            _bottomLine.graphics.lineTo(1000, 600);
            this.addChild(_bottomLine);
            var _topLine:Sprite=new Sprite();
            _topLine.graphics.lineStyle(6, 999, 0.8);
            _topLine.graphics.moveTo(0, 100);
            _topLine.graphics.lineTo(360, 100);
            this.addChild(_topLine);
            var _startBoll:Sprite=new Sprite();
            _startBoll.graphics.beginFill(988, 0.8);
            _startBoll.graphics.drawCircle(0, 100, 40);
            _startBoll.graphics.endFill();
            this.addChild(_startBoll);
            _startBoll.addEventListener(MouseEvent.CLICK, onStartClick);
            
            var _label:TextField=new TextField();
            _label.text="start";
            _label.x=0;
            _label.y=81;
            _startBoll.addChild(_label);
            //stage.addEventListener(MouseEvent.CLICK, onClick);
            this._bollTimer.addEventListener(TimerEvent.TIMER, onEnterFrame);
            //stage.addEventListener(MouseEvent.MOUSE_MOVE, onClick);
        }

        private function onStartClick(e:MouseEvent):void
        {
            var _boll:CircleBoll=new CircleBoll();
            _boll.x=40;
            _boll.y=87;
            this.addChild(_boll);

            this._bollTimer.reset();
            this._bollTimer.delay=60;
            this._bollTimer.repeatCount=400;
            this._bollTimer.start();
            //this.setChildIndex(_bottomLine,this.numChildren-1);
        }

        private function onClick(e:MouseEvent):void
        {
            var _boll:CircleBoll=new CircleBoll();
            _boll.x=this.mouseX;
            _boll.y=this.mouseY;
            this.addChild(_boll);
            this._bollTimer.reset();
            this._bollTimer.delay=60;
            this._bollTimer.repeatCount=400;
            this._bollTimer.start();
            //this.setChildIndex(_bottomLine,this.numChildren-1);
        }

        private function onEnterFrame(e:Event):void
        {
            if (this.numChildren > 0)
            {
                for (var i:uint=0; i < this.numChildren; i++)
                {

                    var obj:CircleBoll=this.getChildAt(i) as CircleBoll;

                    if (obj)
                    {
                        if (obj.x <= 365)
                        {
                            obj.x+=5;
                            obj.rotation+=10;
                            continue;
                        }

                        if (obj.y <= bottom - 5)
                        {
                            obj.speed+=gravity;
                            if (obj.y + obj.speed > bottom - 5)
                            {
                                obj.y=bottom - 5;
                                obj.speed=-obj.speed * 0.8;
                                continue;
                            }
                        }
                        obj.y+=obj.speed;
                    }
                }
            }
        }
    }
}





-------------------
package com.phyics
{

    import flash.display.GradientType;
    import flash.display.Sprite;
    import flash.geom.Matrix;

    public class CircleBoll extends Sprite
    {
        public var speed:int=0;
        public var vx:int=0;
        public function CircleBoll()
        {

            var _matrix:Matrix=new Matrix();
            _matrix.createGradientBox(3, 2, 0, 1, 2);
            var colorArray:Array=[0xff0000, 0x0000ff];
            var alphaArray:Array=[5, 5];
            var ratationArray:Array=[0x00, 0xff];
            graphics.beginGradientFill(GradientType.LINEAR, colorArray, alphaArray, ratationArray, _matrix);
            var a:int=Math.random() * 99999999;
            graphics.beginGradientFill(GradientType.LINEAR, colorArray, alphaArray, ratationArray, _matrix);

            // this.graphics.beginFill(a, 1);
            this.graphics.drawCircle(0, 0, 10);
            this.graphics.endFill();
        }

    }
}

 

 

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