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              body {
    font-family: sans-serif;
    padding: 0;
    margin: 0;
    background-color: #eee9e9;
    overflow: hidden;
    -webkit-user-select: none;
       -moz-user-select: none;
         -o-user-select: none;
        -ms-user-select: none;
            user-select: none;
}

canvas {
    position: absolute;
    top: 0;
    left: 0;
}
            
          
!
            
              
/**
 * requestAnimationFrame
 */
window.requestAnimationFrame = (function(){
    return  window.requestAnimationFrame       ||
            window.webkitRequestAnimationFrame ||
            window.mozRequestAnimationFrame    ||
            window.oRequestAnimationFrame      ||
            window.msRequestAnimationFrame     ||
            function (callback) {
                window.setTimeout(callback, 1000 / 60);
            };
})();


// Configs

var Configs = {
    backgroundColor: '#eee9e9',
    particleNum: 1000,
    step: 5,
    base: 1000,
    zInc: 0.001
};


// Vars

var canvas,
    context,
    screenWidth,
    screenHeight,
    centerX,
    centerY,
    particles = [],
    hueBase = 0,
    simplexNoise,
    zoff = 0,
    gui;


// Initialize

function init() {
    canvas = document.getElementById('c');

    window.addEventListener('resize', onWindowResize, false);
    onWindowResize(null);

    for (var i = 0, len = Configs.particleNum; i < len; i++) {
        initParticle((particles[i] = new Particle()));
    }

    simplexNoise = new SimplexNoise();

    canvas.addEventListener('click', onCanvasClick, false);

    gui = new dat.GUI();
    gui.add(Configs, 'step', 1, 10);
    gui.add(Configs, 'base', 500, 3000);
    gui.add(Configs, 'zInc', 0.0001, 0.01);
    gui.close();

    update();
}


// Event listeners

function onWindowResize(e) {
    screenWidth  = canvas.width  = window.innerWidth;
    screenHeight = canvas.height = window.innerHeight;

    centerX = screenWidth / 2;
    centerY = screenHeight / 2;

    context = canvas.getContext('2d');
    context.lineWidth = 0.3;
    context.lineCap = context.lineJoin = 'round';
}

function onCanvasClick(e) {
    context.save();
    context.globalAlpha = 0.8;
    context.fillStyle = Configs.backgroundColor;
    context.fillRect(0, 0, screenWidth, screenHeight);
    context.restore();
    
    simplexNoise = new SimplexNoise();
}


// Functions

function getNoise(x, y, z) {
    var octaves = 4,
        fallout = 0.5,
        amp = 1, f = 1, sum = 0,
        i;

    for (i = 0; i < octaves; ++i) {
        amp *= fallout;
        sum += amp * (simplexNoise.noise3D(x * f, y * f, z * f) + 1) * 0.5;
        f *= 2;
    }

    return sum;
}

function initParticle(p) {
    p.x = p.pastX = screenWidth * Math.random();
    p.y = p.pastY = screenHeight * Math.random();
    p.color.h = hueBase + Math.atan2(centerY - p.y, centerX - p.x) * 180 / Math.PI;
    p.color.s = 1;
    p.color.l = 0.5;
    p.color.a = 0;
}


// Update

function update() {
    var step = Configs.step,
        base = Configs.base,
        i, p, angle;
    
    for (i = 0, len = particles.length; i < len; i++) {
        p = particles[i];

        p.pastX = p.x;
        p.pastY = p.y;
    
        angle = Math.PI * 6 * getNoise(p.x / base * 1.75, p.y / base * 1.75, zoff);
        p.x += Math.cos(angle) * step;
        p.y += Math.sin(angle) * step;
        
        if (p.color.a < 1) p.color.a += 0.003;

        context.beginPath();
        context.strokeStyle = p.color.toString();
        context.moveTo(p.pastX, p.pastY);
        context.lineTo(p.x, p.y);
        context.stroke();
        
        if (p.x < 0 || p.x > screenWidth || p.y < 0 || p.y > screenHeight) {
            initParticle(p);
        }
    }
    
    hueBase += 0.1;
    zoff += Configs.zInc;

    requestAnimationFrame(update);
}


/**
 * HSLA
 */
function HSLA(h, s, l, a) {
    this.h = h || 0;
    this.s = s || 0;
    this.l = l || 0;
    this.a = a || 0;
}

HSLA.prototype.toString = function() {
    return 'hsla(' + this.h + ',' + (this.s * 100) + '%,' + (this.l * 100) + '%,' + this.a + ')';
}

/**
 * Particle
 */
function Particle(x, y, color) {
    this.x = x || 0;
    this.y = y || 0;
    this.color = color || new HSLA();
    this.pastX = this.x;
    this.pastY = this.y;
}


// Run

init();

            
          
!
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