JS1k: The JavaScript code golfing competition

var b=document,d=b.getElementById("c"),e=d.getContext("2d"),g=d.width=780,h=d.height=500,j=Math,k=j.abs,l=j.max,m=j.min,n=j.cos,q=j.sin,r=j.sqrt,t=j.ceil,w=j.PI*2,z=0,A,B=5,C=my=mw=0,D,E;b.bgColor="#000";function F(a,c,o,p,G){a+=q(o/4)*p;c+=n(o/4)*p;A+=G/r(1+a*a+c*c)}d.onmouseup=d.onmousedown=function(){B=4-B};d.onmousemove=function(a){C=a.clientX;my=a.clientY};
setInterval(function(){e.fillStyle="rgba(0,0,192,0.01)";e.fillRect(0,0,g,h);D=q(z/97)*9+20;E=n(z/83)*7+13.5;u=t(D);v=t(E);for(y=0;y<27;++y)for(x=0;x<40;++x){var a=x-u,c=y-v,o=(x-u+D)*20,p=(y-v+E)*20;A=-1;f=q(z/54)*5+z/37;s2=9+7*q(z/29+q(z/43));s=28-s2;F(a,c,0,0,9);F(a,c,f,6+s/4,s);F(a,c,f+w*2,6+s/4,s);F(a,c,f+w,7,s2);F(a,c,f+w*3,7,s2);dx=C/20-D-a;dy=my/20-E-c;A+=mw/(dx*dx+dy*dy+1);for(i=0;i<6;++i)F(a,c,i*2+q(i+z/23)+z/32,26,-15);A=k(A)-1;SatAngle=q(z/27)+z/53;Sat=99+99*q(a*q(SatAngle)/3+c*n(SatAngle)/
2+z/4);e.fillStyle="hsl("+A*8+","+Sat+"%,"+(30+A*7)+"%)";A=m(14,A*9);if(A>0){e.beginPath();e.arc(o,p,A,0,w,0);e.fill()}}mw=l(0,mw-B);z++},20);

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