JS1k: The JavaScript code golfing competition

d=document;d.body.innerHTML="<a href=''><canvas id=c></canvas></a>";M=Math;S=M.sin;C=M.cos;h=d.body.style;h.background="#111";h.textAlign="center";r=M.random;n=d.getElementById("c");n.width=n.height=W=500;h.paddingTop=(window.innerHeight-W)/2+"px";q=n.style;q.MozBoxShadow=q.webkitBoxShadow=q.boxShadow="0 0 15px #000";c=n.getContext("2d");t=r()>0.5?0:1;E=[];for(i=250;i--;)E[i]=[5*r(),5*r(),10*r(),0.04+0.02*r()];D=0;h=360*r();if(t)b="hsl("+(h+30)%360+",90%,5%)";else{b="rgba(0,0,0,0.07)";n=r()>0.5?0:1}setInterval('c.fillStyle=b;c.fillRect(0,0,W,W);if(t)E.sort(function(a,b){return a[2]-b[2]});for(i=250;i--;){I=E[i];o=I[2]*30-I[2]*I[2];f=(W-2*o)/5;c.beginPath();c.arc(o+I[0]*f,o+I[1]*f,M.min(10-I[2],10),0,6,0);if(t)c.fillStyle="hsl("+h+",90%,"+4*(10-I[2])+"%)";else c.fillStyle="hsla("+(h+20*I[n])%360+",90%,50%,0.5)";c.fill();I[2]-=I[3];if(t){I[0]+=0.01*S(D+I[2]);I[1]+=0.01*C(D+I[0])}else{I[0]+=0.005*S(D);I[1]+=0.005*C(D)}if(I[2]<-5||I[0]<-10||I[1]<-10||I[0]>15||I[1]>15){I[2]=10;I[0]=5*r();I[1]=5*r()}}D+=0.01',16)

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