feat: item collection system, score mutations

src/game/mod.rs

@@ -19,6 +19,7 @@ use crate::systems::{
     control::player_system,
     debug::{debug_render_system, DebugState, DebugTextureResource},
     input::input_system,
+    item::item_system,
     movement::movement_system,
     profiling::{profile, SystemTimings},
     render::{directional_render_system, dirty_render_system, render_system, BackbufferResource, MapTextureResource},
@@ -211,6 +212,7 @@ impl Game {
                 profile("player", player_system),
                 profile("movement", movement_system),
                 profile("collision", collision_system),
+                profile("item", item_system),
                 profile("blinking", blinking_system),
                 profile("directional_render", directional_render_system),
                 profile("dirty_render", dirty_render_system),

src/systems/item.rs

@@ -0,0 +1,43 @@
+use bevy_ecs::{event::EventReader, prelude::*, query::With, system::Query};
+
+use crate::{
+    events::GameEvent,
+    systems::components::{EntityType, ItemCollider, PacmanCollider, ScoreResource},
+};
+
+pub fn item_system(
+    mut commands: Commands,
+    mut collision_events: EventReader<GameEvent>,
+    mut score: ResMut<ScoreResource>,
+    pacman_query: Query<Entity, With<PacmanCollider>>,
+    item_query: Query<(Entity, &EntityType), With<ItemCollider>>,
+) {
+    for event in collision_events.read() {
+        if let GameEvent::Collision(entity1, entity2) = event {
+            // Check if one is Pacman and the other is an item
+            let (_pacman_entity, item_entity) = if pacman_query.get(*entity1).is_ok() && item_query.get(*entity2).is_ok() {
+                (*entity1, *entity2)
+            } else if pacman_query.get(*entity2).is_ok() && item_query.get(*entity1).is_ok() {
+                (*entity2, *entity1)
+            } else {
+                continue;
+            };
+
+            // Get the item type and update score
+            if let Ok((item_ent, entity_type)) = item_query.get(item_entity) {
+                match entity_type {
+                    EntityType::Pellet => {
+                        score.0 += 10;
+                    }
+                    EntityType::PowerPellet => {
+                        score.0 += 50;
+                    }
+                    _ => continue,
+                }
+
+                // Remove the collected item
+                commands.entity(item_ent).despawn();
+            }
+        }
+    }
+}

src/systems/mod.rs

@@ -10,6 +10,7 @@ pub mod control;
 pub mod debug;
 pub mod formatting;
 pub mod input;
+pub mod item;
 pub mod movement;
 pub mod profiling;
 pub mod render;