在编译器中输入代码：
复制代码
package{
importflash.display.MovieClip;
publicclassParticleextendsMovieClip{
//Weneeddifferentspeedsfordifferentparticles.
//Thesevariablescanbeaccessedfromthemainmovie,becausetheyarepublic.
publicvarspeedX:Number;
publicvarspeedY:Number;
functionParticle():void{
}
}
}
7、切换到fla主类。生成粒子实例，显示在舞台上，而且增加一些效果。在第1帧输入代码：
复制代码
//Weneedfewimportsforthefilters
importfl.motion.Color;
importflash.geom.ColorTransform;
//Createanarrayfortheparticlesforlateruse
varnumberOfParticles:Number=30;
varparticlesArray:Array=newArray();
//Thisloopcreates30particlesthatarepositionedrandomlyonthestage.
//Wealsoaddsomeeffectstotheparticles
for(vari=0;i<numberOfParticles;i++){
varparticle:Particle=newParticle();
//Giverandomxandyspeedtotheparticle.
//Math.randomreturnsarandomnumbern,where0<=n<1.
particle.speedX=2+Math.random();
particle.speedY=2+Math.random();
//Setthestartingposition
particle.y=Math.random()*stage.stageHeight;
particle.x=Math.random()*stage.stageWidth;
//Setarandomtinttotheparticle,sotheywillhavedifferentcolors.
varct:Color=newColor();
ct.setTint(0xFFFFFF*Math.random(),0.5);
particle.transform.colorTransform=ct;
//Setrandomsizetotheparticles,sotheparticleswilldifferinsize
particle.scaleX=0.5+Math.random();
particle.scaleY=particle.scaleX;
//Thisarrayisusedtostoreallofthefilters
varparticleFilters:Array=newArray();
//Createadifferentblureffectineachparticle
vartempBlurAmount=Math.random()*4;
varblur:BlurFilter=newBlurFilter(tempBlurAmount,tempBlurAmount,1);
particleFilters.push(blur);
//Createagloweffectineachparticle
varcolor:Number=0x000000;
varalphaValue:Number=0.5;
varblurX:Number=20;
varblurY:Number=20;
varstrength:Number=5;
varglow:GlowFilter=newGlowFilter(color,
alphaValue,
blurX,
blurY,
strength);
particleFilters.push(glow);
//Applythecreatedfilterstotheparticle(blur&glow)
particle.filters=particleFilters;
//Addtheparticletothestageandpushitintoanarrayforlateruse
addChild(particle);
particlesArray.push(particle);
}
可能看起来很难的 ，但实际上非常简单。注释应该解释的很充分。测试一下影片剪辑，效果如图。图5：
8、注册Event.ENTER_FRAME事件，随机地移动粒子。接上面输入代码：
