JS1k: The JavaScript code golfing competition

m=Math;l=document;l.onkeyup=function(){j=!j};z="lineTo";a=l.body.children[0];a.width=700;a.height=350;b=a.getContext("2d");a=m.random;b.lineWidth=0.5;c=[];d=[];e=[];h=1.8;j=true;function k(o){return m.round(o)+0.5}q=m.floor;t=m.abs;function p(o,r,s,t,z){b.strokeStyle=b.fillStyle="rgb(50,50,"+z+")";b.beginPath();b.moveTo(k(o[0]),k(o[1]));b.lineTo(k(r[0]),k(r[1]));b.lineTo(k(s[0]),k(s[1]));b.lineTo(k(t[0]),k(t[1]));b.lineTo(k(o[0]),k(o[1]));j?b.fill():0;b.stroke()}for(i=0;i<1600;i++){c[i]=d[i]=0;e[i]=[]}setInterval(function(){g=c;c=d;d=g;h+=0.01;for(y=1;y<39;y++)for(x=1;x<39;x++){i=x+y*40;d[i]=((c[i-40]+c[i+1]+c[i+40]+c[i-1])/2-d[i])*0.9}f=m.cos(h);g=m.sin(h);i=0;for(y=-10;y<10;y+=0.5)for(x=-10;x<10;x+=0.5){u=x*f-y*g;v=8E3/(y*f+x*g+350);n=e[i];n[0]=u*v+350;n[1]=(d[i++]+100)*v-2150}if(10*a()<1)c[q(1+37*a())+q(1+37*a())*40]=1+a();b.clearRect(0,0,700,700);for(y=0;y<39;y++){x=0;for(i=y*40;x<39;x++,i++){u=e[i];v=e[i+1];w=e[i+40];f=e[i+41];p(w,u,v,f,128+q(256*m.max(t(d[i]),t(d[i+1]),t(d[i+40]),t(d[i+41]))))}}},50);

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

Original source not submitted