const num = 500;

let walker = [];

​

function setup() {

  createCanvas(windowWidth, windowHeight);

  frameRate(60);

  for (let i = 0; i < num; i++) {

    walker[i] = new Walker();

  }

  background(0);

}

​

function draw() {

  background(0, 5);

  for (let i = 0; i < num; i++) {

    walker[i].draw();

  }

}

​

class Walker {

  constructor() {

    this.position = createVector(width / 2, height / 2);

  }

  draw() {

    for (let i = 0; i < 10; i++) {

      this.velocity = createVector(random(-1, 1), random(-1, 1));

      this.position.add(this.velocity);

      noStroke();

      fill(255);

      circle(this.position.x, this.position.y, 2);

    }

  }

}