11 releases (6 stable)

2.0.0 Mar 17, 2024
1.0.4 Dec 26, 2022
0.1.4 Dec 23, 2022

#272 in Game dev

Download history 7/week @ 2024-02-19 4/week @ 2024-02-26 90/week @ 2024-03-11 60/week @ 2024-03-18 254/week @ 2024-04-01

404 downloads per month

MIT/Apache

18KB
164 lines

Bevy ECS Markers

Crates.io MIT/Apache 2.0

Adds the support for marking entites and fetching them in queries

Example

View more examples here

#[derive(EntityMarker)]
enum Players {
    Red,
    Blue,
    Green,
    Yellow,
}

#[derive(Component)]
struct Player {
    field: usize,
}

fn main() {
    App::new()
        .add_plugins(LogPlugin::default())
        .init_marker::<Players>()
        .add_systems(Startup, (setup, move_red_player).chain())
        .run();
}

fn setup(mut commands: Commands, mut players: MarkerMut<Players>) {
    players[Players::Red].assign(commands.spawn(Player { field: 2 }).id());
    players[Players::Blue].assign(commands.spawn(Player { field: 5 }).id());
    players[Players::Green].assign(commands.spawn(Player { field: 7 }).id());
    players[Players::Yellow].assign(commands.spawn(Player { field: 1 }).id());
}

fn move_red_player(mut query: Query<&mut Player>, current: Marker<Players>) {
    let Ok(mut player) = query.get_mut(current[Players::Red].id()) else {
        warn!("Red Player not set yet!");
        return;
    };

    let old = player.field;
    player.field += 2;
    let new = player.field;

    info!("Player moved from field {old} to field {new}");
}

License

at your option.

Dependencies

~8–40MB
~572K SLoC