JS1k: The JavaScript code golfing competition

W=c.width=500;H=c.height=600;r=Math.random;P=Math.pow;S=Math.sqrt;p=10;a.f=a.fillRect;c.onmousemove=function(b){p=b.clientY};function k(b,f){for(var g=0;g<b.length;g++)b[g]==f&&b.splice(g,1)}function v(b,f){if(b.T=="c"&&(d=S(P(b.x-f.x,2)),f.y>p/H))return 0;b.T=="u"&&(d=S(P(b.x-f.x,2)),d=r()<0.009?d:1);return d<0.01?1:0}function E(b,f,g,h,l){this.x=b;this.y=f;this.N=g;this.M=h;this.m=l;this.R=0}m=[];for(i=0;i<10;i++)n=new E(r(),r(),r(),r(),0.001),m.push(n);z=[];o=[];
for(i=0.2;i<0.8;i+=0.05)R={},R.x=i,R.T="u",o.push(R),R={T:"c"},R.x=i-0.009,z.push(R);
setInterval(function(){a.fillStyle="#005";a.f(0,0,W,H);a.fillStyle="#0f0";for(i=0;i<m.length;i++){n=m[i];a.f(W*n.x-2,H*n.y-2,4,4);(n.x<0||n.x>1||n.y<0||n.y>1)&&k(m,n);n.x+=n.N*n.m;n.y+=n.M*n.m;for(j=t=0;j<o.length;j++){u=o[j];C=z[j];v(C,n)&&k(m,n);if(v(u,n)){if(n.R)n.N=r()>=0.5?-n.N:n.N,n.M=r()>=0.5?-n.M:n.M,e=new E(n.x,n.y,r(),r(),n.m),m.push(e),n.R=0;t=1}i==0&&(u=o[j],x=u.x*W,a.f(x-2,0,4,H),u=z[j],x=u.x*W,a.f(x-2,0,4,p))}n.R=t?0:1}},0);

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