JS1k: The JavaScript code golfing competition

var p=1,z=window,d="innerWidth",f="innerHeight",cv=1,ch=0,cs=100,cl=50,x=0,y=0,w,h2,w2,cw,lw=20,sw=0.5,r=z.requestAnimationFrame||z.webkitRequestAnimationFrame||z.mozRequestAnimationFrame||z.oRequestAnimationFrame||function(e){setTimeout(e,16)};function scroll(g){sw+=(g.detail?g.detail*-1:g.wheelDelta/40)*0.1;set()}function set(){c.width=z[d];c.height=z[f];h2=z[f]/2,w2=z[d]/2,w=z[d]/lw;cw=c.width;cv=360/Math.ceil(cw/lw)+sw}function draw(){var h,e=0,g=0;for(;e<cw;e+=lw){g+=cv;cl=10+(80*e/cw);h="hsl("+((ch+g)%360)+","+cs+"%,"+cl+"%)";a.strokeStyle=h;a.fillColor=h;a.lineWidth=lw*2;a.beginPath();a.arc(Math.sin(x)*e+w2,Math.sin(y)*e+h2,e,0,6.3);a.stroke()}ch=(ch+cv)%360;if(p){r(draw)}}b.addEventListener("mousewheel",scroll);b.addEventListener("DOMMouseScroll",scroll);b.style.margin=0;b.style.padding=0;z.addEventListener("resize",set);b.addEventListener("mousemove",function(g){x=(g.clientX-w2)/(2*c.width);y=(g.clientY-h2)/(c.height)});b.addEventListener("click",function(g){if(p=!p){draw(c)}});draw(a);set();

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