Flex 粒子效果

、

话不多说 上代码

自定义了MyEllipse类 随机了粒子的大小 颜色 重力值 和偏移量

public class MyEllipse extends Ellipse
    {
        /**重力*/
         var gravity:Number=0.1;
        
        /**偏移量*/
        var offsetX=1;
        var offsetY=-3;

        public function MyEllipse()
        {
            offsetY=GetRandomNum(-5, 5);
            offsetX=GetRandomNum(-3, 3);
            var solidColor:SolidColor=new SolidColor(uint(GetRandomColor()), 1);
            this.fill=solidColor;
            var size:Number=GetRandomNum(1, 10);
            this.width=size;
            this.height=size;
        }

        /**扩散*/
        public function Pervasion():void
        {
            this.x+=offsetX;
            this.y+=offsetY;
            this.alpha+=-gravity / 10;
            offsetY+=gravity;
        }

        /**获取随机颜色*/
        public static function GetRandomColor():String
        {
            return "0x" + Math.round(Math.random() * 0xFFFFFF).toString(16);
        }

        /**随机数*/
        public static function GetRandomNum(min:int, max:int):Number
        {
            return Math.round(Math.random() * max) + min;
        }
    }

呈现界面代码

<?xml version="1.0" encoding="utf-8"?>
<s:Application xmlns:fx="http://ns.adobe.com/mxml/2009"
               xmlns:s="library://ns.adobe.com/flex/spark"
               xmlns:mx="library://ns.adobe.com/flex/mx"
               width="500" height="400" minWidth="300" minHeight="600" creationComplete="Init()">
    <fx:Declarations>
        <!-- 将非可视元素（例如服务、值对象）放在此处 -->
    </fx:Declarations>
    <fx:Script>
        <![CDATA[
            import mx.graphics.GradientEntry;
            import mx.graphics.RadialGradient;
            import mx.graphics.SolidColor;
            import mx.graphics.Stroke;
            
            import org.osmf.events.TimeEvent;
            
            import spark.primitives.Ellipse;
            import spark.primitives.Rect;
            private function Init():void{
            mainCanvas.addEventListener(MouseEvent.MOUSE_MOVE,OnMouseClick);
            var timer:Timer = new Timer(10);
            timer.addEventListener(TimerEvent.TIMER,OnTimerEvent);
            timer.start();
            }
            private function OnTimerEvent(event:TimerEvent):void
            {
                var clength:int = mainCanvas.numElements;
                for(var i:int=0;i<clength;i++)
                {
                    var  ellipse:MyEllipse  = mainCanvas.getElementAt(i) as MyEllipse;
                    ellipse.Pervasion();
                    if(ellipse.alpha<=0)
                    {
                        mainCanvas.removeElementAt(i);
                        clength-=1;
                    }
                }
            }
            public function OnMouseClick(event:MouseEvent ):void{
                var  ellipse:MyEllipse = new MyEllipse();
                ellipse.x=mouseX;
                ellipse.y  = mouseY;    
                mainCanvas.addElement(ellipse);
            }
        ]]>
    </fx:Script>
    <s:BorderContainer id="mainCanvas" left="10" right="10" top="10" bottom="10"
                       backgroundColor="#000000" cornerRadius="10" horizontalCenter="0"
                       verticalCenter="0">
    </s:BorderContainer>
</s:Application>

最后 感谢http://upload.meqzone.com/ 提供的免费上传swf的服务