message: fixed shadow example
diff: @@ -400,7 +400,7 @@ impl event::EventHandler for MainState {
  }
  fn mouse_motion_event(&mut self, ctx: &mut Context, x: f32, y: f32, _xrel: f32, _yrel: f32) {
  - let (w, h) = graphics::size(ctx);
  + let (w, h) = graphics::drawable_size(ctx);
  let (x, y) = (x / w as f32, 1.0 - y / h as f32);
  self.torch.pos = [x, y];
  }
  