JS1k: The JavaScript code golfing competition

e=[];i=Math;r=i.random;f=2*i.PI;m=c.height=innerHeight-30;v=c.width=innerWidth-30;h=m>>1;i=h-3;c=55;j=[];o=200;k=o*5;z=0;l=0;g=(v)>>2;for(d=h*4;d--;)j[d-h]=[];for(d=k;d--;)e[d]=[9+r()*i*2,10+r()*i*2,310+r()*o>>1];function s(w,g,x,y,s,z){a.fillStyle="rgba("+w+','+w+","+g+","+z+")";a.beginPath();a.arc(x,y,s,0,f,1);a.fill();}b.onmousemove=function(q){n=q.clientX;if(n!=l){q=0.9995;w=n>l?0.03:-0.03;z+=w;for(d=k;--d;){p=e[d];j[p[0]>>0][p[1]>>0]=0;x0=p[0]-h;y0=p[1]-h;p[0]=x0*q-y0*w+h;p[1]=x0*w+y0*q+h;j[p[0]>>0][p[1]>>0]=1;}l=n;}};setInterval(function(){a.arc(g+h,h,h,0,f,1);a.clip();a.save();a.translate(g+h,h);a.rotate(z);s(c,o,-h>>1,h*1.8,h,1);s(c,o,h>>1,h*1.6,h,1);s(o,c,h>>1,-h>>1,h/8,1);a.restore();  s(c,c,g+h,h,h,0.2);for(d=k;d--;){w=e[d];if(w[0]>h*2)w[0]=h*2;j[w[0]>>0][w[1]>>0]=0;x=w[0]+r()-0.5,y=w[1]+r()*2;if(y>i*2)y=i*2;for(u=o;m=x-h,q=y-h,u--&&m*m+q*q>i*i;)x+=m>0?-1:1;if(!j[x>>0][y>>0])w[0]=x,w[1]=y;j[w[0]>>0][w[1]>>0]=1;s(w[2],w[2],g+w[0],w[1],1,1);}for(d=9;d--;)s(o,o,g+h,h,h-d*5,0.02);},50);

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