createCanvas(800, 800);

  background(255);

  strokeWeight(2);

}

​

function draw() {

  // No loop needed

  noLoop();

​

  // Divide the canvas into four equal parts

  let partWidth = width / 2;

  let partHeight = height / 2;

​

  for (let i = 0; i < 2; i++) {

    for (let j = 0; j < 2; j++) {

      drawThreeLines(i * partWidth, j * partHeight, partWidth, partHeight);

    }

  }

}

​

function drawThreeLines(x, y, w, h) {

  // Draw horizontal line

  line(x, y + h / 2, x + w, y + h / 2);

​

  // Draw vertical line

  line(x + w / 2, y, x + w / 2, y + h);

​

  // Draw diagonal line

  if (random(1) < 0.5) {

    line(x, y, x + w, y + h);

  } else {

    line(x + w, y, x, y + h);

  }

}

​