复制代码
addEventListener(Event.ENTER_FRAME,enterFrameHandler);
//Thisfunctionisresponsibleforanimation
functionenterFrameHandler(e:Event):void{
//Let’sloopthroughtheparticles
for(i=0;i<particlesArray.length;i++){
varparticleOne:Particle=particlesArray[i];
//Movetheparticletoanewlocation
particleOne.x+=particleOne.speedX;
particleOne.y+=particleOne.speedY;
//Checktheboundaries.
//Ifahitoccurs,multiplythespeedby(-1)toreversethespeed.
//Rightedge
if(particleOne.x>stage.stageWidth){
particleOne.x=stage.stageWidth-particleOne.width/2;
particleOne.speedX*=-1;
}
//Leftedge
elseif(particleOne.x<0){
particleOne.x=particleOne.width/2;
particleOne.speedX*=-1;
}
//Bottom
if(particleOne.y>stage.stageHeight){
particleOne.y=stage.stageHeight-particleOne.width/2;
particleOne.speedY*=-1;
}
//Top
elseif(particleOne.y<0){
particleOne.y=particleOne.width/2;
particleOne.speedY*=-1;
}
}
}
测试影片剪辑，观看一下效果。未命名-1.swf：
9、为粒子加入连线，修改 enterFrameHandler，代码如下：
复制代码
functionenterFrameHandler(e:Event):void{
//Clearthepreviouslines
graphics.clear();
//Let’sloopthroughtheparticles
for(i=0;i<particlesArray.length;i++){
varparticleOne:Particle=particlesArray[i];
//Movetheparticletoanewlocation
particleOne.x+=particleOne.speedX;
particleOne.y+=particleOne.speedY;
//Checktheboundaries
if(particleOne.x>stage.stageWidth){
particleOne.x=stage.stageWidth-particleOne.width/2;
particleOne.speedX*=-1;
