JS1k: The JavaScript code golfing competition

A=100,W=800,H=600,T=W/2,U=H/2,E=[],t=0,M=Math,P=M.PI,C=document.getElementById("c"),D=C.getContext("2d"),p=parseInt,Z=M.abs,_=255;C.width=W;C.height=H;C.onmousemove=function(a){T=a.x;U=a.y};C.onmouseout=function(){T=W/2;U=H/2};D.fillStyle="rgba(0, 0, 0, 0.1)";for(var i=0;i<A;i++){E.push({x:W/2,y:H/2,s:3,a:i/A*P*2})}setInterval(function(){t++;D.fillRect(0,0,W,H);D.beginPath();for(var a=0;a<A;a++){var c=E[a];if(M.sqrt(M.pow(Z(c.x-T),2)+M.pow(Z(c.y-U),2))<2){c.s=25}else{var b=M.atan(Z(U-c.y)/Z(T-c.x));if(U<c.y){b=P*2-b}if(T<c.x){b=P-b}c.a=B(c.a+(function(e,d){return((e>d?d+P*2:d)-e<P)?1:-1})(B(c.a),B(b))*P/60)}D.moveTo(c.x,c.y);c.x=c.x+M.cos(c.a)*c.s,c.y=c.y+M.sin(c.a)*c.s;D.lineTo(c.x,c.y);c.x=c.x<0?c.x+W:c.x%W;c.y=c.y<0?c.y+H:c.y%H;if(c.s>3){c.s*=0.9}}D.strokeStyle=F(t%360);D.closePath();D.stroke()},10);function B(a){return a<0?B(a+P*2):a%(P*2)}function F(a){function b(f,d,g){return"rgb("+f+","+d+","+g+")"}var e=p(a%(360/6)*6);return[b(_,e,0),b(_-e,_,0),b(0,_,e),b(0,_-e,_),b(e,0,_),b(_,0,_-e)][p(a/360*6)]};

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