Noisy Brushstrokes 2

// By Roni Kaufman

// Inspired by Sol LeWitt's "Squiggly Brushstrokes"

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let particles = [];

let n = 500;

let colorZone = 0;

let squiggliness = 1/200;

​

function setup() {

  createCanvas(windowWidth, windowHeight);

  colorMode(HSB, 100);

  noStroke();

  background(10);

  updateParticles();

  setInterval(updateParticles, 2500);

}

​

function draw() {

  for (let p of particles) {

    p.draw();

    p.move();

  }

}

​

function updateParticles() {

  particles = [];

  for (let i = 0; i < n; i++) {

    let x_ = random(width);

    let y_ = random(height);

    let s_ = 7;

    let c_ = color((random(15) + colorZone) % 100, 90, 90, 100);

    particles.push(new Particle(x_, y_, s_, c_));

  }

  colorZone += 10;

}

​

function Particle(x_, y_, s_, c_) {

  this.x = x_;

  this.y = y_;

  this.size = s_;

  this.c = c_;

  this.alpha = 100;

  this.dist = 1;

  this.move = function() {

    let theta = noise(this.x * squiggliness, this.y * squiggliness)*PI*4;

    let v = p5.Vector.fromAngle(theta, this.dist);

    this.x += v.x;

    this.y += v.y;

    this.dist *= 0.9999;

    this.alpha *= 0.95;

  }

  this.draw = function() {

    this.c.setAlpha(this.alpha);

    fill(this.c);

    circle(this.x, this.y, this.size);

    this.c.setAlpha(100);

  }

}