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

trait Avatar {
    fn draw(&self);
}

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

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

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

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

fn api_draw(api: &APIData) {
    let avatar = api.root.downcast::<dyn Avatar>().unwrap();
    avatar.draw();
}

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

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

    api_draw(&api);
}