JS1k: The JavaScript code golfing competition

c.width=w=innerWidth;c.height=h=innerHeight;s();function s(){l();c.addEventListener("mousemove",m,false);}function m(k){var t,u;if(k.layerX!==undefined){t=k.layerX;u=k.layerY;}else{t=k.offsetX;u=k.offsetY;}l();var o=w/2,p=h/2,r=Math.sqrt(q(t-o)+q(u-p)),v=-Math.PI/2;for(j=0;j<20;j++){a.lineWidth=j+1;a.beginPath();for(i=0;i<3;i++){var z=v+i*2*Math.PI/3,x=o+Math.cos(z-j)*Math.sqrt(q(t-(j*10)-o)+q(u-(j*10)-p)),y=p+Math.sin(z-j)*Math.sqrt(q(t-(j*10)-o)+q(u-(j*10)-p));if(i==0){a.moveTo(x,y);}else{a.lineTo(x,y);}}a.closePath();a.stroke();}}function q(n){return n*n;}function l(){a.globalCompositeOperation='xor';a.clearRect(0,0,w,h);}

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