enemy can drop key

src/keys.rs

@@ -0,0 +1,80 @@
+use crate::player::Player;
+use avian3d::prelude::*;
+use bevy::prelude::*;
+use std::f32::consts::PI;
+
+#[derive(Event, Reflect)]
+pub struct KeySpawn(pub Vec3);
+
+#[derive(Component, Reflect)]
+#[reflect(Component)]
+struct Key;
+
+#[derive(Event, Reflect)]
+pub struct KeyCollected;
+
+pub fn plugin(app: &mut App) {
+    app.add_systems(Update, collect_key);
+    app.add_observer(on_spawn);
+}
+
+fn on_spawn(
+    trigger: Trigger<KeySpawn>,
+    mut commands: Commands,
+    mut meshes: ResMut<Assets<Mesh>>,
+    mut materials: ResMut<Assets<StandardMaterial>>,
+) {
+    let KeySpawn(position) = trigger.event();
+
+    let mesh = meshes.add(Cylinder::default());
+
+    //TODO: randomize
+    let spawn_dir = Quat::from_rotation_y(PI / 2.) * Vec3::new(0.5, 0.6, 0.).normalize();
+
+    commands
+        .spawn((
+            Name::new("key"),
+            Key,
+            Transform::from_translation(*position),
+            Visibility::default(),
+            Collider::sphere(1.5),
+            ExternalImpulse::new(spawn_dir * 180.).with_persistence(false),
+            LockedAxes::ROTATION_LOCKED,
+            RigidBody::Dynamic,
+            Restitution::new(0.6),
+        ))
+        .with_child((
+            Transform::from_scale(Vec3::new(2.2, 0.4, 2.2))
+                .with_rotation(Quat::from_rotation_x(PI / 2.)),
+            Mesh3d(mesh),
+            MeshMaterial3d(materials.add(Color::srgb(0., 0., 0.9))),
+        ));
+}
+
+fn collect_key(
+    mut commands: Commands,
+    mut collision_event_reader: EventReader<CollisionStarted>,
+    query_player: Query<&Player>,
+    query_collectable: Query<&Key>,
+    asset_server: Res<AssetServer>,
+) {
+    for CollisionStarted(e1, e2) in collision_event_reader.read() {
+        let collectable = if query_player.contains(*e1) && query_collectable.contains(*e2) {
+            Some(*e2)
+        } else if query_player.contains(*e2) && query_collectable.contains(*e1) {
+            Some(*e1)
+        } else {
+            None
+        };
+
+        if let Some(collectable) = collectable {
+            commands.spawn((
+                AudioPlayer::new(asset_server.load("sfx/effects/key_collect.ogg")),
+                PlaybackSettings::DESPAWN,
+            ));
+
+            commands.trigger(KeyCollected);
+            commands.entity(collectable).despawn_recursive();
+        }
+    }
+}