// Daniel Shiffman

// http://natureofcode.com

​

let walkers = [];

let stepSize = 5;

​

function setup() {

  createCanvas(400, 400);

  walkers.push(new Walker());

  background(0);

}

​

function draw() {

  for (let i = walkers.length - 1; i >= 0; i--) {

    let walker = walkers[i];

    walker.step();

    walker.show();

​

    if (random(1) < 0.01) {

      console.log("split");

      let w = new Walker(walker.x, walker.y);

      walkers.push(w);

    }

​

    if (walker.lifespan < 0) {

      walkers.splice(i, 1);

    }

  }

}

​

class Walker {

  constructor(x, y) {

    if (random(1) > 0.5) {

      this.col = color(255);

    } else {

      this.col = color(0);

    }

    this.x = x || width / 2;

    this.y = y || height / 2;

    this.lifespan = 500;

  }

​

  show() {

    fill(this.col);

    square(this.x, this.y, stepSize);

  }

​

  step() {

    this.lifespan--;

    const choice = floor(random(4));

    if (choice == 0) {

      this.x += stepSize;

    } else if (choice == 1) {

      this.x -= stepSize;

    } else if (choice == 2) {

      this.y += stepSize;

    } else {

      this.y -= stepSize;

    }

  }

}

​