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              * {
	margin: 0px;
	padding: 0px;
}

body{
	background: #222;
}

#c {
	position: fixed;
	margin: 0px auto;
	z-index: -2;
}

#fps {
  position: fixed;
  top: 0px;
}
            
          
!
            
              let canvas = document.getElementById('c');
let ctx = canvas.getContext('2d');
let pattern = new Pattern();
let ctrl = new Controler();
let gui = new dat.GUI();
let stats = new Stats();
let reset = false;

let rand = (max, min) => (max - min) * Math.random() + min;
let int = parseInt;

function Controler(){
	this.red = 255;
	this.green = 128;
	this.blue = 64;
	this.noise = 128;
	this.scale = 10;
	this.stop = false;
}

gui.close();
gui.add(ctrl, 'red', 0, 255);
gui.add(ctrl, 'green', 0, 255);
gui.add(ctrl, 'blue', 0, 255);
gui.add(ctrl, 'noise', 0, 255);
gui.add(ctrl, 'scale', 3, 30).step(1);
gui.add(ctrl, 'stop');

stats.showPanel(0);
document.querySelector('span').appendChild(stats.domElement);

function Pattern() {
	this.data = [];
}

Pattern.prototype.draw = function(j, i, w, h){
	let x, y, k, pos, img = ctx.getImageData(j, i, w, h);
					
	for(y = 0; y < h; y++){
		for(x = 0; x < w; x++){
			pos = 4*(w*y + x);

			for(k = 0; k < 3; k++){
				img.data[pos + k] = pattern.data[3*(w*y + x) + k];
			}
			
			img.data[pos + k] = 255;
		}
	}

	ctx.putImageData(img, j, i);
}

Pattern.prototype.set = function(w, h){
	let i, j, k, w1, w2;

	let rgb = [
		rand(-10, ctrl.red),
		rand(-10, ctrl.green),
		rand(-10, ctrl.blue)
	];

	for(i = 0; i < h; i++){
		for(j = 0; j < w; j++){
			if(j > 0) {
				w1 = rand(0, 10);
				w2 = rand(1, 10);

				for(k = 0; k < 3; k++) {
					pattern.data[3*(w*i + j) + k] = (w1 * pattern.data[3*(w*i + j-1) + k])
					pattern.data[3*(w*i + j) + k] += w2 * (rgb[k] + rand(0, ctrl.noise));
					pattern.data[3*(w*i + j) + k] /= (w1 + w2);
				}
			} else {
				for(k = 0; k < 3; k++) {
					pattern.data[3*(w*i + j) + k] = rgb[k] + rand(0, ctrl.noise);
				}
			}
		}
	}
}

function setup() {
	reset = false;
	canvas.width = window.innerWidth - 2;
	canvas.height = window.innerHeight - 2;

	requestAnimationFrame(drawBackground);
}

function restart(){
	reset = true;
	requestAnimationFrame(setup);
}

function drawBackground(){
	let i, j, w, h, auxw, auxh, lim;

	stats.begin();
	for(i = 0; i < canvas.height; i += h) {
		w = ctrl.scale*int(rand(1, ctrl.scale));
		h = ctrl.scale*int(rand(1, ctrl.scale/3));
		lim = rand(0, canvas.width);

		auxh = h;
		if(i + h > canvas.height)
			h = canvas.height - i;

		pattern.set(w, h);
		drawLine(i, j, w, h, auxw, lim);
		
		h = auxh;
	}
	stats.end();
	requestAnimationFrame(drawLoop);
}

function drawLine(i, j, w, h, auxw, lim){
	for (j = 0; j < canvas.width; j += w){
		if(j > lim) 
			pattern.set(w, h);

		auxw = w;
		if(j + w > canvas.width)
			w = canvas.width - j;

		pattern.draw(j, i, w, h);
		w = auxw;
	}
}

function drawLoop(){
	stats.begin();

	if(!ctrl.stop){
		let i, j, w, h, auxw, lim;
		lim = rand(0, canvas.width);
		i = rand(0, canvas.height);
		w = ctrl.scale*int(rand(1, ctrl.scale));
		h = ctrl.scale*int(rand(1, ctrl.scale/3));

		if(i + h > canvas.height)
			h = canvas.height - i;

		pattern.set(w, h);
		drawLine(i, j, w, h, auxw, lim);
	}

	stats.end();
	if(!reset) requestAnimationFrame(drawLoop);
}

window.onload = setup;
window.onresize = restart;
            
          
!
999px
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