Based on Daniel Shiffman's implementation of code for the Commodore 64:

10 PRINT CHR$(205.5+RND(1)); : GOTO 10

​

Coding Train Coding Challenge #76: 10PRINT in p5.js

https://www.youtube.com/watch?v=bEyTZ5ZZxZs

*/

​

let x, y, spacing;

​

function setup() {

  createCanvas(windowWidth, windowHeight);

  stroke(255);

  strokeWeight(2);

  initialize();

}

​

function initialize() {

  background(0);

  x = 0;

  y = 0;

  spacing = min(width / 20, height / 20);

}

​

function draw() {

  if (random(1) > 0.5) {

    line(x, y, x + spacing, y + spacing);

  } else {

    line(x, y + spacing, x + spacing, y);

  }

​

  x += spacing;

​

  if (x > width) {

    x = 0;

    y += spacing;

  }

​

  if (y > height) {

    background(0);

    x = 0;

    y = 0;

  }

}

​

function windowResized() {

  resizeCanvas(windowWidth, windowHeight);

  initialize();

}

​