wrire up ammo and health in head_ui

src/backpack/mod.rs

@@ -5,16 +5,29 @@ use bevy::prelude::*;
 
 pub use backpack_ui::BackpackAction;
 
-#[derive(Clone, Copy, Debug, PartialEq)]
+#[derive(Clone, Copy, Debug, PartialEq, Reflect)]
 pub struct BackpackHead {
     pub head: usize,
     pub health: f32,
+    pub ammo: f32,
 }
 
 impl BackpackHead {
+    pub fn new(head: usize) -> Self {
+        Self {
+            head,
+            health: 1.0,
+            ammo: 1.0,
+        }
+    }
+
     pub fn damage(&self) -> f32 {
         1. - self.health
     }
+
+    pub fn ammo_used(&self) -> f32 {
+        1. - self.ammo
+    }
 }
 
 #[derive(Resource, Default)]
@@ -37,6 +50,7 @@ fn setup(mut commands: Commands) {
             .map(|i| BackpackHead {
                 head: i,
                 health: 1.,
+                ammo: 1.,
             })
             .collect(),
     });