let planetAnimated;

let planetMask;

​

function preload(){

  planetStill = loadImage("assets/s01.png");

  planetAnimated = loadImage("assets/01.gif");

  planetMask = loadImage("assets/mask.png");

}

​

function setup() {

  createCanvas(400, 400);

  planetStill.mask(planetMask);

  planetAnimated.mask(planetMask);

  imageMode(CENTER);

}

​

​

function draw() {

  background(220);

  image(planetStill, 100, height/2, 200, 200);

  image(planetAnimated, width-100, height/2, 200, 200);

}