unify explosion handling

src/abilities/missile.rs

@@ -3,11 +3,12 @@ use crate::{
     GameState,
     billboards::Billboard,
     heads_database::HeadsDatabase,
-    hitpoints::Hit,
     loading_assets::GameAssets,
     physics_layers::GameLayer,
     sounds::PlaySound,
-    utils::{global_observer, sprite_3d_animation::AnimationTimer, trail::Trail},
+    utils::{
+        explosions::Explosion, global_observer, sprite_3d_animation::AnimationTimer, trail::Trail,
+    },
 };
 use avian3d::prelude::*;
 use bevy::{pbr::NotShadowCaster, prelude::*};
@@ -22,13 +23,6 @@ struct MissileProjectile {
     damage: u32,
 }
 
-#[derive(Event, Debug)]
-struct Explosion {
-    position: Vec3,
-    radius: f32,
-    damage: u32,
-}
-
 #[derive(Resource)]
 struct ShotAssets {
     image: Handle<Image>,
@@ -44,33 +38,6 @@ pub fn plugin(app: &mut App) {
     );
 
     global_observer!(app, on_trigger_missile);
-    global_observer!(app, on_explosion);
-}
-
-fn on_explosion(
-    explosion: Trigger<Explosion>,
-    mut commands: Commands,
-    spatial_query: SpatialQuery,
-) {
-    let explosion = explosion.event();
-    let intersections = {
-        spatial_query.shape_intersections(
-            &Collider::sphere(explosion.radius),
-            explosion.position,
-            Quat::default(),
-            &SpatialQueryFilter::default().with_mask(LayerMask(
-                GameLayer::Npc.to_bits() | GameLayer::Player.to_bits(),
-            )),
-        )
-    };
-
-    for entity in intersections.iter() {
-        if let Ok(mut e) = commands.get_entity(*entity) {
-            e.trigger(Hit {
-                damage: explosion.damage,
-            });
-        }
-    }
 }
 
 fn setup(mut commands: Commands, assets: Res<GameAssets>, mut sprite_params: Sprite3dParams) {