JS1k: The JavaScript code golfing competition

var c=document.getElementById("c");c.width=c.height=500;
var ctx=c.getContext("2d"),bs=[],rnd=Math.random,f=Math.floor,pw=Math.pow,j,N=200,J=0,H=500,P=function(){function d(g,e){return(e?rnd()>0.5?-1:1:1)*f(rnd()*g)}var b=this;b.x=d(500);b.y=d(500);b.r=d(8);b.dx=d(4,1);b.dy=d(4,1);b.c="rgb("+d(255)+","+d(255)+","+d(255)+")";b.dl=0;b.d=function(g){return Math.sqrt(pw(b.x-g.x,2)+pw(b.y-g.y,2))};b.u=function(){b.dx+=d(3,1)/2;b.dy+=d(3,1)/2;b.x+=b.dx;b.y+=b.dy;b.x=b.x<0?b.x+H:b.x%H;b.y=b.y<0?b.y+H:b.y%H;for(var g=0;g<N;g++){var e=bs[g];if(e&&e!==b){var h=b.d(e);
if(h<30&&b.r<e.r){e=-(1-h/30);b.dx*=e;b.dy*=e}else if(h<b.r-e.r)if(b.r>e.r){b.r+=e.r/2;e.dl=1}}}ctx.fillStyle=b.c;ctx.beginPath();ctx.arc(b.x,b.y,b.r,0,Math.PI*2,true);ctx.closePath();ctx.fill()}};function r(){ctx.fillStyle="rgba(34, 34, 34, 0.3)";ctx.fillRect(0,0,H,H)}function i(){r();for(var d=0;d<N;d++)bs.push(new P);a()}function a(){r();for(var d=0;d<N;d++){var b=bs[d];if(b)if(b.dl===1){bs[d]=null;J++}else b.u()}J<N-1&&setTimeout(a,30)}i();

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var c = document.getElementById("c");
c.width = c.height = 500;
var ctx = c.getContext('2d'),
	bs  = [],
	rnd = Math.random,
	f   = Math.floor,
	pw = Math.pow,
	i,j,
	N   = 200,
	J   = 0,
	H   = 500;
	
var P = function(){
	var B = this;
	B.x  = rn(500); 
	B.y  = rn(500);
	B.r  = rn(8);
	B.dx = rn(4,1);
	B.dy = rn(4,1);
	B.c  = 'rgb(' + rn(255) + "," + rn(255) + "," + rn(255) + ")";
 	B.dl = 0;
	
	B.d = function(b){
		return Math.sqrt(pw(B.x - b.x,2) + pw(B.y - b.y, 2));
	};
	
	function rn(l,p){
		return  ((p)? (rnd() > 0.5)? -1 : 1 : 1) * f(rnd() * l);
	}
	
	B.u = function(){
		B.dx += rn(3,1) / 2;
		B.dy += rn(3,1) / 2;
		B.x  += B.dx;
		B.y  += B.dy;
		B.x = (B.x < 0)? B.x + H: B.x % H; 
		B.y = (B.y < 0)? B.y + H: B.y % H;
		for (var i = 0; i < N;i++){
			var b = bs[i];
			if (b && b !== B){
				var d = B.d(b);
				if (d < 30 && B.r < b.r){
					var w = - (1 - d / 30);
					B.dx *= w;
					B.dy *= w; 
				}
				else if (d < B.r- b.r){
					if (B.r > b.r){
						B.r += b.r / 2;
						b.dl = 1;
					}
				}
			}
		};
		ctx.fillStyle = B.c;
		ctx.beginPath();
		ctx.arc(B.x, B.y, B.r, 0, Math.PI*2, true); 
		ctx.closePath();
		ctx.fill();
	};
};

//reset()
function r(){
	ctx.fillStyle = 'rgba(34, 34, 34, 0.3)';
	ctx.fillRect(0,0,H,H);
}

//init()
function i(){
	r();
	for (var i = 0; i < N;i++){
		bs.push(new P());
	}
	a();
}

//animate()
function a(){
	r();
	for (var i = 0; i < N;i++){
		var p = bs[i];
		if (p){
			if (p.dl === 1){
				bs[i] = null;
				J++;
			}
			else{
				p.u();
			}
		}
	}
	if (J < N - 1){
		setTimeout(a,30);
	}
}
i();