}
elseif(particleOne.x<0){
particleOne.x=particleOne.width/2;
particleOne.speedX*=-1;
}
if(particleOne.y>stage.stageHeight){
particleOne.y=stage.stageHeight-particleOne.width/2;
particleOne.speedY*=-1;
}
elseif(particleOne.y<0){
particleOne.y=particleOne.width/2;
particleOne.speedY*=-1;
}
//Gothroughtheotherparticlestocheckthedistancewiththefirstparticle
for(varj:uint=i+1;j<particlesArray.length;j++){
varparticleTwo:Particle=particlesArray[j];
vardistanceX:Number=particleOne.x-particleTwo.x;
vardistanceY:Number=particleOne.y-particleTwo.y;
//UsePythagoreantheorem(a^2+b^2=c^2)tocalculatethedistance
vardistance:Number=Math.sqrt(distanceX*distanceX+distanceY*distanceY);
//Ifthedistanceissmallerthan80px,drawalinebetweentheparticles
if(distance<80){
drawLine(particleOne,particleTwo);
}
}
}
}
在enterFrameHandler之后添加方法drawLine实现画线功能。
//Thisfunctiondrawsablacklinebetweentwoparticles
functiondrawLine(particleOne:Particle,particleTwo:Particle):void{
graphics.lineStyle(1,0x000000);//线为白色，如黑色背景改为0xffffff
graphics.moveTo(particleOne.x,particleOne.y);
graphics.lineTo(particleTwo.x,particleTwo.y);
} 10、测试影片剪辑。
完整主类代码：
//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);
