​

​

function preload(){

  wallpaper = loadImage("wallpaper.jpg")

}

function setup() {

  createCanvas(660, 480);

}

​

function draw() {

  background(220);

  image(wallpaper, 0, 0);

  let c = wallpaper.get(mouseX, mouseY);

  fill(c);

  square(mouseX, mouseY, 50);

}