WIP on engine upgrade

src/lib.rs

@@ -77,10 +77,10 @@ impl Plugin for AsteroidPlugin {
             )
                 .run_if(in_state(GameState::Playing)),
         )
-        .add_event::<messages::SpawnAsteroid>()
-        .add_event::<messages::AsteroidDestroy>()
-        .add_event::<messages::ShipDestroy>()
-        .add_event::<messages::BulletDestroy>();
+        .add_message::<messages::SpawnAsteroid>()
+        .add_message::<messages::AsteroidDestroy>()
+        .add_message::<messages::ShipDestroy>()
+        .add_message::<messages::BulletDestroy>();
         app.insert_state(GameState::TitleScreen);
     }
 }

src/objects.rs

@@ -6,7 +6,7 @@ use bevy::{
     ecs::{
         component::Component,
         entity::Entity,
-        event::{EventReader, EventWriter},
+        message::{MessageReader, MessageWriter},
         query::With,
         system::{Commands, Query, Res, ResMut, Single},
     },
@@ -69,7 +69,7 @@ pub struct Debris;
 
 /// Responds to [`SpawnAsteroid`] events, spawning as specified
 pub fn spawn_asteroid(
-    mut events: EventReader<SpawnAsteroid>,
+    mut events: MessageReader<SpawnAsteroid>,
     mut commands: Commands,
     game_assets: Res<GameAssets>,
 ) {
@@ -109,8 +109,8 @@ pub fn spawn_asteroid(
 /// The velocity of the child asteroids is scattered somewhat, as if they were
 /// explosively pushed apart.
 pub fn split_asteroids(
-    mut destroy_events: EventReader<AsteroidDestroy>,
-    mut respawn_events: EventWriter<SpawnAsteroid>,
+    mut destroy_events: MessageReader<AsteroidDestroy>,
+    mut respawn_events: MessageWriter<SpawnAsteroid>,
     mut commands: Commands,
     query: Query<(&Transform, &Asteroid, &Velocity)>,
 ) {
@@ -171,7 +171,7 @@ pub fn spawn_player(mut commands: Commands, game_assets: Res<GameAssets>) {
 
 /// Watch for [`BulletDestroy`] events and despawn
 /// the associated bullet.
-pub fn bullet_impact_listener(mut commands: Commands, mut events: EventReader<BulletDestroy>) {
+pub fn bullet_impact_listener(mut commands: Commands, mut events: MessageReader<BulletDestroy>) {
     for event in events.read() {
         commands.entity(event.0).despawn();
     }
@@ -187,7 +187,7 @@ pub fn bullet_impact_listener(mut commands: Commands, mut events: EventReader<Bu
 /// - Clear all asteroids
 /// - Respawn player
 pub fn ship_impact_listener(
-    mut events: EventReader<ShipDestroy>,
+    mut events: MessageReader<ShipDestroy>,
     mut commands: Commands,
     mut lives: ResMut<Lives>,
     rocks: Query<Entity, With<Asteroid>>,

src/physics.rs

@@ -89,10 +89,10 @@ pub(crate) fn wrap_entities(
 /// | Bullet & Bullet | Nothing. Bullets won't collide with each other (and probably can't under normal gameplay conditions) |
 /// | Bullet & Ship | Nothing. The player shouldn't be able to shoot themselves (and the Flying Saucer hasn't been impl.'d, so it's bullets don't count) |
 pub fn collision_listener(
-    mut collisions: EventReader<CollisionEvent>,
-    mut ship_writer: EventWriter<messages::ShipDestroy>,
-    mut asteroid_writer: EventWriter<messages::AsteroidDestroy>,
-    mut bullet_writer: EventWriter<messages::BulletDestroy>,
+    mut collisions: BufferedReader<CollisionEvent>,
+    mut ship_writer: MessageWriter<messages::ShipDestroy>,
+    mut asteroid_writer: MessageWriter<messages::AsteroidDestroy>,
+    mut bullet_writer: MessageWriter<messages::BulletDestroy>,
     player: Single<Entity, With<Ship>>,
     bullets: Query<&Bullet>,
     rocks: Query<&Asteroid>,