JS1k: The JavaScript code golfing competition

var w; var h;var c;var a;var C;var ld;var S=Math.sqrt;var R = Math.random;
function O(){var a=(R()-0.5)*6.29;var r=R()*R()*w/2;this.x=Math.cos(a)*r;this.y=Math.sin(a)*r;this.u=this.v=0;this.r=R()*w/75}
function update(){
w=c.width;h=c.height;w2=w/2;h2=h/2;
date=new Date();nd=date.getTime();t=nd-ld;
C.fillStyle='#000'; C.fillRect(0,0,w,h);C.fillStyle='rgba(255,255,255,0.1)'; 
for(var i=0,l=a.length;i<l;i++)
{o=a[i];d2=(o.x*o.x)+(o.y*o.y);d=S(d2);f=t/d2;
if(o.u==0.0&&o.v==0.0){o.u=S(1/d)*o.y/d;o.v=S(1/d)*(-o.x)/d;}
else{o.u-=f*(o.x/d);o.v-=f*(o.y/d);}
o.x+=o.u*t;
o.y+=o.v*t;
if (o.x<-w2||o.y>w2||o.y<-h2||o.y>h2||d<w/20) a[i]=new O();else C.fillRect(o.x+w2-o.r/2, o.y+h2-o.r/2,o.r,o.r);
}
if(t<33) for(var i=0;i<10;i++) a.push(new O());
ld=nd;
setTimeout(update,1);
}
function init(){
c=document.getElementById("c");c.width=1024;c.height=768;C=c.getContext('2d');a=new Array();date=new Date();ld=date.getTime();update();
}
init()

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