JS1k: The JavaScript code golfing competition

for(MR=Math.random,MI=(()=>2*Math.PI),cht=innerHeight,cwh=innerWidth,S=(c=>c.stroke()||c),bp=((c,e)=>(c.beginPath(),e&&(c.fillStyle=e),c)),d=3,np=cht*cwh/(100*d),cA=[],crA=["#00f","#6f77ec"],B=((e,r,t,i,l)=>{var y=crA[~~(2*MR())];return()=>{e+=t,r+=i,c=bp(c,y),c.arc(e,r,l,0,MI(),!1),c.fill()}}),C=(()=>{for(requestAnimationFrame(C),c.fillStyle="black",c.fillRect(0,0,cwh,cht),r=150,eR=20,mA=90,c=bp(c,"yellow"),c.arc(cX,cY,r,0,MI(),!1),c.fill(),c.lineWidth=5,c.strokeStyle="black",c=S(c),c=bp(c,"black"),c.arc(eyX,eyY,eR,0,MI(),!1),eT=cX+eX,c.arc(eT,eyY,eR,0,MI(),!1),c.fill(),c=bp(c),c.arc(cX,cY,mA,0,Math.PI,!1),c=S(c),xL=xS+100,yL=yS+100,bX!=xL&&bX++,bY!=yL&&bY++,c=bp(c),c.lineWidth=10,c.strokeStyle="#A00",c.moveTo(xS,yS),c.arc(bX,bY,3,0,MI()),c=S(c),i=1;i<cA.length;i++)cA[i]()}),eX=55,cY=cht/2,cX=cwh/2,eyX=cX-eX,eyY=cY-eX,xS=eyX-50,yS=eyY-50,bX=xS,bY=yS,cA=[],X=(()=>.5*(MR()-.5)),Y=(c=>MR()*(c-2*r)),i=1;i<np;i++)r=3*MR()+1,x=Y(cwh),y=Y(cht),dx=X(),dy=X(),cA.push(B(x,y,dx,dy,r));C();

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