// by Yatharth

// This code is based on everything I learned from

// Daniel Shiffman (https://thecodingtrain.com)

​

let day = true;

​

function setup() {

  createCanvas(windowWidth, windowHeight);

}

​

function draw() {

  // if it is day, fill the background with white

  if (day) {

    background(255);

    fill(0);

  } else {  // else it is night, fill the background with black

    background(0);

    fill(255);

  }

  // displaying the text on the screen

  textAlign(CENTER);

  textSize(30);

  text("Press mouse button to interact", width / 2, height / 2);

}

​

function mousePressed() {

  // inverting the 'day' variable

  // day = true -> day = false

  // day = false -> day = true

  day = !day;

}

​