let x = 0;

let directionX = 2;

​

function preload() {

  gif = createImg("lunidin.gif", "lunidin.gif"); //??

}

​

function setup() {

  createCanvas(700, 700);

  background(220);

}

​

function draw() {

  gif.position(x, 0);

  x = x + directionX;

​

  if (x > width) {

    directionX = -2;

  }

  if (x < 0) {

    directionX = 2;

  }

}

​