Based on the Recursive Squares example from Chapter 8: Drawing with Recursion, Processing: Creative Coding and Generative Art in Processing 2, 2013, by Ira Greenberg, Dianna Xu, Deepak Kumar

*/

​

let minSize = 100;

​

function setup() {

  createCanvas(windowWidth, windowHeight);

  initialize();

}

​

function initialize() {

  background(0);

  rectMode(CENTER);

  noFill();

  stroke(255);

  let squareSize = min(width, height) / 2;

  drawSquare(width / 2, height / 2, squareSize);

}

​

function drawSquare(x, y, size) {

  square(x, y, size);

​

  if (size >= minSize) {

    let newSize = size / 2;

​

    drawSquare(x - newSize, y - newSize, newSize);

    drawSquare(x + newSize, y - newSize, newSize);

    drawSquare(x - newSize, y + newSize, newSize);

    drawSquare(x + newSize, y + newSize, newSize);

  }

}

​

function windowResized() {

  resizeCanvas(windowWidth, windowHeight);

  initialize();

}

​