use std::rc::Rc;
use std::any::Any;

trait Avatar: Any {
    fn draw(&self);

    fn as_any(self: Rc<Self>) -> Rc<dyn Any>;
}

struct PointAvatar {
    x: i32,
    y: i32,
}

impl Avatar for PointAvatar {
    fn draw(&self) {}

    fn as_any(self: Rc<Self>) -> Rc<dyn Any> {
        self
    }
}

struct APIData {
    root: Rc<dyn Avatar>,
}

fn init_api(avatar: Rc<dyn Avatar>) -> APIData {
    APIData {root: avatar}
}

fn api_draw(api: &APIData) {
    api.root.draw();
}

fn main() {
    let avatar: Rc<dyn Avatar> = Rc::new(PointAvatar {x: 0, y: 0});
    let api = init_api(Rc::clone(&avatar));

    // these two lines would happen every frame or something
    let avatar = avatar.as_any().downcast::<PointAvatar>().unwrap();
    avatar.x += 1;

    api_draw(&api);
}