About Wallpapers.

PImage img;
float ratio;

void setup() {
  fullScreen();
  img = loadImage("landscape.jpg");
  ratio = float(img.width)/float(img.height);
}

void draw() {
  background(0);
  float w = wallpaperHomeCount() * width;
  float h = w/ratio;
  float x = map(wallpaperOffset(), 0, 1, 0, -(wallpaperHomeCount()-1) * width);
  image(img, x, 0, w, h);
}

There is no response when you insert the source.

Anyone know why?