character hierarchy system param

src/character.rs

@@ -1,5 +1,5 @@
 use crate::{GameState, heads_database::HeadsDatabase, loading_assets::GameAssets};
-use bevy::{prelude::*, utils::HashMap};
+use bevy::{ecs::system::SystemParam, prelude::*, utils::HashMap};
 use std::time::Duration;
 
 #[derive(Component, Debug)]
@@ -8,6 +8,20 @@ pub struct ProjectileOrigin;
 #[derive(Component, Debug)]
 pub struct AnimatedCharacter(pub usize);
 
+#[derive(SystemParam)]
+pub struct CharacterHierarchy<'w, 's> {
+    descendants: Query<'w, 's, &'static Children>,
+    projectile_origin: Query<'w, 's, &'static GlobalTransform, With<ProjectileOrigin>>,
+}
+
+impl CharacterHierarchy<'_, '_> {
+    pub fn projectile_origin(&self, entity: Entity) -> Option<&GlobalTransform> {
+        self.descendants
+            .iter_descendants(entity)
+            .find_map(|child| self.projectile_origin.get(child).ok())
+    }
+}
+
 #[derive(Component, Debug, Reflect)]
 #[reflect(Component)]
 pub struct CharacterAnimations {