JS1k: The JavaScript code golfing competition

d=[];Q=E=0;r=Math.random
b.onclick=e=>
{X=e.x;Y=e.y;d.push([X,Y]);c.fillStyle='#fff';
c.fillRect(0,0,4e3,4e3);Q=E=0}
F=0;f=q=>{c.fillStyle='#000'
for(i in d)c.fillRect(d[i][0],d[i][1],5,5)
m=2
for(j=9999;j--;)
{
  z=(r()*d.length)|0
  D=d[z]
  Q=(Q+D[0])/2
  E=(E+D[1])/2
  c.fillStyle=`hsl(${E*Q/d.length+F*F},99%,20%)`
  c.fillRect(Q,E,1,1)
};F++}
setInterval(f,1)

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