Split crate into shared logic library and binary crate (#52)

crates/shared/src/backpack/ui_head_state.rs

@@ -0,0 +1,39 @@
+use crate::heads::HeadState;
+use bevy::prelude::*;
+
+#[derive(Clone, Copy, Debug, PartialEq, Reflect, Default)]
+pub struct UiHeadState {
+    pub head: usize,
+    pub health: f32,
+    pub ammo: f32,
+    pub reloading: Option<f32>,
+}
+
+impl UiHeadState {
+    pub fn damage(&self) -> f32 {
+        1. - self.health
+    }
+
+    pub fn ammo_used(&self) -> f32 {
+        1. - self.ammo
+    }
+
+    pub fn reloading(&self) -> Option<f32> {
+        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,
+        }
+    }
+}