relaod mechanic

src/abilities/mod.rs

@@ -82,6 +82,7 @@ fn on_trigger_state(
     player_rot: Query<&Transform, With<PlayerRig>>,
     player_transform: Query<&Transform, With<Player>>,
     mut active_heads: ResMut<ActiveHeads>,
+    time: Res<Time>,
 ) {
     if matches!(trigger.event(), TriggerState::Active) {
         let Some(state) = active_heads.current() else {
@@ -107,7 +108,7 @@ fn on_trigger_state(
             pos: transform.translation,
         };
 
-        active_heads.use_ammo();
+        active_heads.use_ammo(time.elapsed_secs());
 
         match state.ability {
             HeadAbility::Thrown => commands.trigger(TriggerThrow(trigger_state)),

src/aim/target_ui.rs

@@ -154,6 +154,7 @@ fn sync(
                 head: head.0,
                 health: hp.health(),
                 ammo: 1.,
+                reloading: None,
             });
         }
     }

src/backpack/backpack_ui.rs

@@ -262,6 +262,7 @@ fn swap_head_inputs(
     backpack: Res<Backpack>,
     mut commands: Commands,
     mut state: ResMut<BackpackUiState>,
+    time: Res<Time>,
 ) {
     if state.count == 0 {
         return;
@@ -292,17 +293,17 @@ fn swap_head_inputs(
 
     if changed {
         commands.trigger(PlaySound::Selection);
-        sync(&backpack, &mut state);
+        sync(&backpack, &mut state, time.elapsed_secs());
     }
 }
 
-fn sync_on_change(backpack: Res<Backpack>, mut state: ResMut<BackpackUiState>) {
+fn sync_on_change(backpack: Res<Backpack>, mut state: ResMut<BackpackUiState>, time: Res<Time>) {
-    if backpack.is_changed() {
+    if backpack.is_changed() || backpack.reloading() {
-        sync(&backpack, &mut state);
+        sync(&backpack, &mut state, time.elapsed_secs());
     }
 }
 
-fn sync(backpack: &Res<Backpack>, state: &mut ResMut<BackpackUiState>) {
+fn sync(backpack: &Res<Backpack>, state: &mut ResMut<BackpackUiState>, time: f32) {
     state.count = backpack.heads.len();
 
     state.scroll = state.scroll.min(state.count.saturating_sub(HEAD_SLOTS));
@@ -316,7 +317,7 @@ fn sync(backpack: &Res<Backpack>, state: &mut ResMut<BackpackUiState>) {
 
     for i in 0..HEAD_SLOTS {
         if let Some(head) = backpack.heads.get(i + state.scroll) {
-            state.heads[i] = Some(UiHeadState::from(*head));
+            state.heads[i] = Some(UiHeadState::new(*head, time));
         } else {
             state.heads[i] = None;
         }

src/backpack/mod.rs

@@ -15,6 +15,18 @@ pub struct Backpack {
     pub heads: Vec<HeadState>,
 }
 
+impl Backpack {
+    pub fn reloading(&self) -> bool {
+        for head in &self.heads {
+            if !head.has_ammo() {
+                return true;
+            }
+        }
+
+        false
+    }
+}
+
 #[derive(Event)]
 pub struct BackbackSwapEvent(pub usize);
 

src/backpack/ui_head_state.rs

@@ -6,6 +6,7 @@ pub struct UiHeadState {
     pub head: usize,
     pub health: f32,
     pub ammo: f32,
+    pub reloading: Option<f32>,
 }
 
 impl UiHeadState {
@@ -16,14 +17,23 @@ impl UiHeadState {
     pub fn ammo_used(&self) -> f32 {
         1. - self.ammo
     }
-}
 
-impl From<HeadState> for UiHeadState {
+    pub fn reloading(&self) -> Option<f32> {
-    fn from(value: HeadState) -> Self {
+        self.reloading
+    }
+
+    pub(crate) fn new(value: HeadState, time: f32) -> Self {
+        let reloading = if value.has_ammo() {
+            None
+        } else {
+            Some((time - value.last_use) / value.reload_duration)
+        };
+
         Self {
             head: value.head,
             ammo: value.ammo as f32 / value.ammo_max as f32,
             health: value.health as f32 / value.health_max as f32,
+            reloading,
         }
     }
 }

src/heads/heads_ui.rs

@@ -182,11 +182,18 @@ fn update_ammo(
     if res.is_changed() {
         for (mut gradient, HeadImage(head)) in gradients.iter_mut() {
             if let Some(head) = res.heads[*head] {
-                let ammo_used = head.ammo_used();
                 let Gradient::Conic(gradient) = &mut gradient.0[0] else {
                     continue;
                 };
-                let angle = PI * 2. * ammo_used;
+
+                let progress = if let Some(reloading) = head.reloading() {
+                    1. - reloading
+                } else {
+                    head.ammo_used()
+                };
+
+                let angle = progress * PI * 2.;
+
                 gradient.stops[1].angle = Some(angle);
                 gradient.stops[2].angle = Some(angle);
             }
@@ -203,11 +210,13 @@ fn update_health(res: Res<UiActiveHeads>, mut query: Query<(&mut Node, &HeadDama
     }
 }
 
-fn sync(active: Res<ActiveHeads>, mut state: ResMut<UiActiveHeads>) {
+fn sync(active: Res<ActiveHeads>, mut state: ResMut<UiActiveHeads>, time: Res<Time>) {
-    if active.is_changed() {
+    if active.is_changed() || active.reloading() {
         state.current_slot = active.slot();
         for i in 0..HEAD_SLOTS {
-            state.heads[i] = active.head(i).map(UiHeadState::from);
+            state.heads[i] = active
+                .head(i)
+                .map(|state| UiHeadState::new(state, time.elapsed_secs()));
         }
     }
 }

src/heads/mod.rs

@@ -25,6 +25,8 @@ pub struct HeadState {
     pub health_max: u32,
     pub ammo: u32,
     pub ammo_max: u32,
+    pub reload_duration: f32,
+    pub last_use: f32,
 }
 
 impl HeadState {
@@ -36,6 +38,8 @@ impl HeadState {
             ammo,
             ammo_max: ammo,
             ability: HeadAbility::None,
+            reload_duration: 5.,
+            last_use: 0.,
         }
     }
 
@@ -61,12 +65,13 @@ impl ActiveHeads {
         self.heads[self.current_slot]
     }
 
-    pub fn use_ammo(&mut self) {
+    pub fn use_ammo(&mut self, time: f32) {
         let Some(head) = &mut self.heads[self.current_slot] else {
             error!("cannot use ammo of empty head");
             return;
         };
 
+        head.last_use = time;
         head.ammo = head.ammo.saturating_sub(1);
     }
 
@@ -77,6 +82,16 @@ impl ActiveHeads {
     pub fn head(&self, slot: usize) -> Option<HeadState> {
         self.heads[slot]
     }
+
+    pub fn reloading(&self) -> bool {
+        for head in self.heads {
+            if head.map(|head| head.ammo == 0).unwrap_or(false) {
+                return true;
+            }
+        }
+
+        false
+    }
 }
 
 #[derive(Event, Reflect)]
@@ -103,6 +118,7 @@ pub fn plugin(app: &mut App) {
     });
 
     app.add_systems(OnEnter(GameState::Playing), setup);
+    app.add_systems(Update, reload.run_if(in_state(GameState::Playing)));
 
     app.add_observer(on_select_active_head);
     app.add_observer(on_swap_backpack);
@@ -117,6 +133,22 @@ fn setup(mut commands: Commands, asset_server: Res<AssetServer>) {
     commands.insert_resource(HeadsImages { heads });
 }
 
+fn reload(mut active: ResMut<ActiveHeads>, time: Res<Time>) {
+    if !active.reloading() {
+        return;
+    }
+
+    for head in active.heads.iter_mut() {
+        let Some(head) = head else {
+            continue;
+        };
+
+        if !head.has_ammo() && (head.last_use + head.reload_duration <= time.elapsed_secs()) {
+            head.ammo = head.ammo_max;
+        }
+    }
+}
+
 fn on_select_active_head(
     trigger: Trigger<SelectActiveHead>,
     mut commands: Commands,