JS1k: The JavaScript code golfing competition

i=Math;P=i.cos;L=i.sin;M=i.random;J=i.round;_=i.PI;c=document.getElementById('c');c.x=c.setAttribute;c.x('width',1000);c.x('height',800);c=c.getContext('2d');c.t=c.translate;c.b=c.beginPath;c.m=c.moveTo;c.l=c.lineTo;c.lineCap='round';c.strokeStyle='#0a0';c.t(500,400);S=[[0,0]];E=[];R=D=W=A=d=p=0;setInterval(function(){c.clearRect(-1e3,-1e3,2e3,2e3);R+=(W-R)*.04;D+=(A-D)*.04;c.t(-R,-D);c.lineWidth=8;c.b();c.m(S[0][0],S[0][1]);for(i=0;i<S.length;i++){p=S[i];c.l(p[0],p[1])}
w=p[0]+P(d)*5;a=p[1]+L(d)*5;d+=M()*.4-.2;k=M();if(M()<.05){E.push({b:[[w,a]],a:d+_*J(M()),k:k,t:4,s:0,ms:M()*40+10})}
S.push([w,a,k]);c.stroke();W=P(d)*-100+p[0];A=L(d)*-100+p[1];for(i=0;i<E.length;i++){with(E[i]){c.b();c.lineWidth=t;c.m(b[0][0],b[0][1]);for(j=0;j<b.length;j++){p=b[j];c.l(p[0],p[1])}
a+=M()-.5;if(s++<ms){b.push([p[0]+P(a)*5,p[1]+L(a)*5]);if(M()<.1&&t==4){E.push({b:[p],a:a,k:k,s:0,t:2,ms:M()*20+10})}}
c.stroke();}}
if(S.length>300){k=S.shift()[2];i=0;while(i<E.length){(E[i].k==k)?E.splice(i,1):i++;}}
c.t(R,D);},33);

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