Unit World UI

Assets/Prefabs/Unit.prefab

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+  maxHealth: 100
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Assets/Scripts/HealthSystem.cs

@@ -1,15 +1,25 @@
 using System;
 using UnityEngine;
+using UnityEngine.Serialization;
 
 public class HealthSystem : MonoBehaviour {
-    [SerializeField] private int health = 100;
+
+    private int health;
+    [SerializeField] private int maxHealth = 100;
+    public float HealthNormalized => (float)health / maxHealth;
+
     public event EventHandler OnDead;
+    public event EventHandler OnDamage;
+
+    private void Awake() => health = maxHealth;
+
     public void Damage(int damageAmount) {
         health -= damageAmount;
         if (health < 0) health = 0;
         if (health == 0) Die();
-        Debug.Log($"{gameObject.name} {health}");
+        OnDamage?.Invoke(this, EventArgs.Empty);
     }
 
     private void Die() => OnDead?.Invoke(this, EventArgs.Empty);
+
 }

Assets/Scripts/LookAtCamera.cs

@@ -1,6 +1,3 @@
-using System;
-using System.Collections;
-using System.Collections.Generic;
 using UnityEngine;
 
 public class LookAtCamera : MonoBehaviour {

Assets/Scripts/UI/UnitWorldUI.cs

@@ -1,19 +1,28 @@
 using System;
 using TMPro;
 using UnityEngine;
+using UnityEngine.UI;
 
 namespace UI {
     public class UnitWorldUI : MonoBehaviour {
         [SerializeField] private TextMeshProUGUI actionPointsText;
         [SerializeField] private Unit unit;
+        [SerializeField] private Image healthBarImage;
+        [SerializeField] private HealthSystem healthSystem;
 
         private void Start() {
             Unit.OnAnyActionPointsChanged += Unit_OnAnyActionPointsChanged;
+            healthSystem.OnDamage += HealthSystem_OnDamage;
             UpdateActionPointsText();
+            UpdateHealthBar();
         }
 
+        private void HealthSystem_OnDamage(object sender, EventArgs e) => UpdateHealthBar();
+
         private void Unit_OnAnyActionPointsChanged(object sender, EventArgs e) => UpdateActionPointsText();
 
         private void UpdateActionPointsText() => actionPointsText.text = unit.ActionPoints.ToString();
+
+        private void UpdateHealthBar() => healthBarImage.fillAmount = healthSystem.HealthNormalized;
     }
 }