JS1k: The JavaScript code golfing competition

function t(o){m=["#f95","#000","#4f6","#567"],c.fillStyle=m[o]}function R(l,t,w,h){this.l=l||0,this.t=t||0,this.w=w||0,this.h=h||0,this.r=this.l+this.w,this.b=this.t+this.h}function travel(cur){y=rs[cur];for(var j in rs)x=rs[j],ol(y,x)&&x!==y&&(t(2),c.fr(x.l,x.t,x.w,x.h),c.fr(y.l,y.t,y.w,y.h),-1===xx.indexOf(x)&&(xx.push(x),travel(j,cur)))}function re(){for(requestAnimationFrame(re);mrs>i;i++)rs.push(new R(r()*w-50,r()*h-50,25+50*r(),25+50*r())),rs[i].w*rs[i].h>950?(t(1),c.fr(rs[i].l,rs[i].t,rs[i].w,rs[i].h)):(rs.pop(),i--);if(mrs>cc&&i>=mrs)travel(cc),cc++;else{t(0),c.fr(0,0,w,h);for(var j in xx)t(2),c.fr(xx[j].l,xx[j].t,xx[j].w,xx[j].h)}}r=Math.random,f=Math.floor,w=a.width,h=a.height,c.fr=c.fillRect,wh=2*h,ww=2*w,wx=r()*w,wy=r()*h,t(0),c.fr(0,0,w,h),ol=function(r1,r2){return r1.l<r2.r&&r2.l<r1.r&&r1.t<r2.b&&r2.t<r1.b},rs=[],mrs=f(w/5),i=0,cc=0,xx=[],setInterval(function(){t(0),c.fr(0,0,w,h),i=0,rs=[],xx=[],cc=0},5e3),re();

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