JS1k: The JavaScript code golfing competition

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var {sin,cos,random,PI,sqrt,atan2,floor}=Math;

function rp(){
	return -2000 + random() * 4000;
}

function sp(t) {
	v[6] = 25+40 * random();
	v[0] = rp();
	v[1] = rp();
	v[2] = rp();
	v[3] = v[4] = v[5] = 0;
	if(!t){
		for (i = 0; i < pts.length; ++i) {
			d = 1/sqrt((v[0] - pts[i][0]) * (v[0] - pts[i][0]) + (v[1] - pts[i][1]) * (v[1] - pts[i][1]) + (v[2] - pts[i][2]) * (v[2] - pts[i][2]))* 1000 / pts[i][6];
			pts[i][3] += (v[0] - pts[i][0]) * d;
			pts[i][4] += (v[1] - pts[i][1]) * d;
			pts[i][5] += (v[2] - pts[i][2]) * d;
		}
	}
	pts.push(v.slice());
}

function ds() {
	for (i = 1; i < pts.length; ++i) {
		d = -1/sqrt((pts[0][0] - pts[i][0]) * (pts[0][0] - pts[i][0]) + (pts[0][1] - pts[i][1]) * (pts[0][1] - pts[i][1]) + (pts[0][2] - pts[i][2]) * (pts[0][2] - pts[i][2]))* 850 / pts[i][6];
		pts[i][3] += (pts[0][0] - pts[i][0]) * d ;
		pts[i][4] += (pts[0][1] - pts[i][1]) * d;
		pts[i][5] += (pts[0][2] - pts[i][2]) * d;
	}
	pts.splice(0, 1);
}

function dr() {
	c.globalAlpha=.1;
	c.fillStyle="#000";
	c.fillRect(0, 0, a.width, a.height);
	c.globalAlpha=1;
	for (i = 0; i < 2999; ++i) {
		pts[i][3] /= 1.04;
		pts[i][4] /= 1.04;
		pts[i][5] /= 1.04;
		pts[i][0] += pts[i][3];
		pts[i][1] += pts[i][4];
		pts[i][2] += pts[i][5];
		c.fillStyle = "hsla("+(ms*3+pts[i][6]*4)+",99%,50%,"+(.8 - pts[i][6] / 50)+")";
		x=pts[i][0],y=pts[i][1],z=pts[i][2];
		z-=cZ,n=-9,b=1,l=9,d=1,e=0,f=0,g=x,h=z,k=(h-f)*(l-n)-(g-e)*(d-b),m=((g-e)*(b-f)-(h-f)*(n-e))/k,j=((l-n)*(b-f)-(d-b)*(n-e))/k;
		pt = {x:cx+(n+m*(l-n))*scl,y:cy+y/z*scl,d:(x*x+y*y+z*z)};
		s=2+pts[i][6]*99/(sqrt(pt.d)/25) ;
		c.fillRect(pt.x, pt.y, s,s);
	}
	ds();
	sp();

	requestAnimationFrame(dr);
	ms += .1;
}

/* remove before minifying */
	c=a.getContext("2d");
/***************************/

a.width=b.clientWidth;
a.height=b.clientHeight;
cx = a.width / 2;
cy = a.height / 2;
pts = [];
v = Array(6);
ms = cX = cY = 0;
cZ = -5000;
scl=500;
pts = [];
for (i = 0; i < 3000; ++i) sp(1);
dr();