fn main() {
    App::new()
        .add_plugins(DefaultPlugins)
        .insert_resource(Images::default())
        .insert_resource(LevelMap::default())
        .add_systems(Startup, (load_images, setup, draw).chain())
        .add_systems(Update, draw)
        .run();
}

fn setup(mut commands: Commands, mut clear_color: ResMut<ClearColor>) {
    commands.spawn(Camera2dBundle::default());
    clear_color.0 = Color::hsl(211., 1., 0.8);
}

fn draw(commands: Commands, level_map: Res<LevelMap>, images: Res<Images>, windows: Query<&Window>) {
    let window_center = Vec2::new(windows.single().resolution.width() / 2., windows.single().resolution.height() / 2.);
    level_map.draw(commands, &images, window_center);
}