JS1k: The JavaScript code golfing competition

with(Math){var c=document.getElementById("c");var o=c.getContext('2d');var w=400;var h=400;c.width=w;c.height=h;var low;var high;function rnd(){seed=(seed*214013+2531011)&0xffffffff;return Math.abs(seed>>16)/32768;}
var step=1/20;var t=0;window.setInterval(function(){o.fillStyle="#000000";o.fillRect(0,0,w,h);o.save();seed=4;for(var j=0;j<500;j++)
{var x=4*rnd()-2-cos(1.31*t);var y=4*rnd()-2-sin(t);if(x*x+y*y<1){var tt=pow(x*x+y*y,2);var d=pow(x*x+y*y,1/6);x/=d;y/=d;var s=(5+sin(t*10.2))/6;x*=s;y*=s;x=x*100+w/2;y=y*100+h/2;var r=floor(rnd()*224)+32;var b=floor(rnd()*224)+32;var g=(r+b)/8;o.globalAlpha=1-tt;o.fillStyle="rgb("+r+","+g+","+b+")";o.fillRect(x-2,y-2,5,5);}}
o.globalCompositeOperation="lighter";var count=7;for(var i=0;i<count;i++)
{var val=count-1-i;o.globalAlpha=0.6;feedback(o,c,w,h,Math.pow(2,1/2/Math.pow(2,val/2)));}
o.restore();t+=step;},step*1000);}
function feedback(o,c,w,h,scale)
{o.save();o.translate(w/2,h/2);o.scale(scale,scale);o.translate(-w/2,-h/2);o.drawImage(c,0,0);o.restore();}

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