feat: Player & Camera

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Assets/_Content/Scripts/CameraFollower.cs

@@ -1,13 +0,0 @@
-using UnityEngine;
-
-[ExecuteAlways]
-public class CameraFollower : MonoBehaviour
-{
-    public GameObject Player;
-
-    void Update()
-    {
-        if (Player)
-            transform.position = Player.transform.position;
-    }
-}

Assets/_Content/Scripts/CameraFollower.cs.meta

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Assets/_Content/Scripts/Characters.meta

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Assets/_Content/Scripts/Characters/Player.cs

@@ -0,0 +1,140 @@
+using Arena.Combat;
+using UnityEngine;
+using UnityEngine.InputSystem;
+
+namespace Arena.Characters
+{
+    public class Player : MonoBehaviour, IDamageable
+    {
+        [System.Serializable]
+        private class Settings
+        {
+            [Tooltip("Movement speed, in km/h.")]
+            public float Speed = 10;
+        }
+
+        [System.Serializable]
+        private struct References
+        {
+            public CharacterController Controller;
+            public InputActionReference MoveAction;
+        }
+
+        [System.Serializable]
+        public class StateContainer
+        {
+            public bool IsMoving = false;
+        }
+
+        #region FIELDS
+
+        public static Player Instance { get; private set; }
+
+        const float KMH_TO_MS = 1 / 3.6f;
+
+        [SerializeField] private Settings _settings;
+        [SerializeField] private References _references;
+        [SerializeField] private StateContainer _state;
+        [SerializeField] private Health _health;
+
+        public StateContainer State => _state;
+
+        private Vector2 _moveInput;
+        private Camera _camera;
+
+        #endregion
+
+        #region UNITY LIFECYCLES
+
+        void Awake()
+        {
+            if (Instance && Instance != this)
+            {
+                Debug.LogWarning($"A second Player was found on {name}, it is destroyed.");
+                Destroy(gameObject);
+                return;
+            }
+
+            Instance = this;
+
+            _health.Initialize();
+
+            _camera = Camera.main;
+        }
+
+        void OnEnable()
+        {
+            _references.MoveAction.action.Enable();
+        }
+
+        void OnDisable()
+        {
+            if (Instance == this)
+                _references.MoveAction.action.Disable();
+        }
+
+        void OnDestroy()
+        {
+            if (Instance == this)
+                Instance = null;
+        }
+
+        void Update()
+        {
+            if (_health.IsDead)
+                return;
+
+            float t = Time.deltaTime;
+
+            GetInputs();
+            Move(t);
+        }
+
+        #endregion
+
+        #region Public Methods
+
+        public void TakeDamage(int amount)
+        {
+            _health.TakeDamage(amount);
+        }
+
+        #endregion
+
+        #region Private Methods
+
+#if UNITY_EDITOR
+        [ContextMenu("Debug/Take 25 Damage")]
+        private void DebugTakeDamage()
+        {
+            TakeDamage(25);
+        }
+#endif
+
+        private void GetInputs()
+        {
+            _moveInput = _references.MoveAction.action.ReadValue<Vector2>();
+        }
+
+        private void Move(float t)
+        {
+            Vector3 direction = ToWorldDirection(_moveInput);
+            Vector3 velocity = direction * KMH_TO_MS * _settings.Speed;
+
+            _state.IsMoving = velocity.sqrMagnitude > .01f;
+
+            _references.Controller.Move(velocity * t);
+        }
+
+        private Vector3 ToWorldDirection(Vector2 input)
+        {
+            // Only the camera rotation around the vertical axis is kept
+            Quaternion cameraHeading = Quaternion.Euler(0f, _camera.transform.eulerAngles.y, 0f);
+            return cameraHeading * new Vector3(input.x, 0f, input.y);
+        }
+
+        #endregion
+
+
+    }
+}

Assets/_Content/Scripts/Characters/PlayerCamera.cs

@@ -0,0 +1,75 @@
+using UnityEngine;
+using UnityEngine.InputSystem;
+
+namespace Arena.Characters
+{
+    [ExecuteAlways]
+    public class PlayerCamera : MonoBehaviour
+    {
+        [System.Serializable]
+        public class Settings
+        {
+            [Tooltip("x: horizontal distance from the player, y: height above the player, in meters.")]
+            public Vector2 Offset = new Vector2(7f, 8f);
+
+            [Tooltip("Rotation of the offset around the player, in degrees.")]
+            public float Angle = 0f;
+
+            [Tooltip("Time to catch up with the player, in seconds. 0: no smoothing.")]
+            [Range(0f, 1f)] public float Smooth = 0.2f;
+        }
+
+        [System.Serializable]
+        private struct References
+        {
+            public Player Player;
+        }
+
+        #region FIELDS
+
+        [SerializeField] private Settings _settings;
+        [SerializeField] private References _references;
+
+        private Vector3 _velocity;
+
+        #endregion
+
+        void Update()
+        {
+            if (!GetPlayer())
+                return;
+
+            Vector3 targetPos = GetTargetPosition();
+
+            if (!Application.isPlaying || _settings.Smooth == 0)
+            {
+                transform.position = targetPos;
+            }
+            else
+            {
+                transform.position = Vector3.SmoothDamp(transform.position, targetPos, ref _velocity, _settings.Smooth);
+            }
+        }
+
+        private bool GetPlayer()
+        {
+            if (_references.Player)
+                return true;
+
+            // In edit mode, Player.Awake has not run, so the singleton is empty
+            else if (Player.Instance)
+                _references.Player = Player.Instance;
+            else
+                _references.Player = FindFirstObjectByType<Player>();
+
+            return _references.Player != null;
+        }
+
+        private Vector3 GetTargetPosition()
+        {
+            Quaternion rotation = Quaternion.Euler(0, _settings.Angle, 0);
+            Vector3 offset = rotation * new Vector3(0, _settings.Offset.y, -_settings.Offset.x);
+            return _references.Player.transform.position + offset;
+        }
+    }
+}

Assets/_Content/Scripts/Characters/PlayerCamera.cs.meta

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Assets/_Content/Scripts/Characters/PlayerEvent.cs

@@ -0,0 +1,16 @@
+using UnityEngine;
+
+public class PlayerEvent : MonoBehaviour
+{
+    // Start is called once before the first execution of Update after the MonoBehaviour is created
+    void Start()
+    {
+        
+    }
+
+    // Update is called once per frame
+    void Update()
+    {
+        
+    }
+}

Assets/_Content/Scripts/Characters/PlayerEvent.cs.meta

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Assets/_Content/Scripts/Combat.meta

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Assets/_Content/Scripts/Combat/Health.cs

@@ -0,0 +1,83 @@
+using System;
+using UnityEngine;
+
+namespace Arena.Combat
+{
+    /// <summary>
+    /// Hit points of an entity. Serialized inside the component that owns it (Player, Enemy),
+    /// which calls Initialize in its Awake.
+    /// </summary>
+    [System.Serializable]
+    public class Health
+    {
+        #region Fields
+
+        [Tooltip("Hit points when full.")]
+        [Min(1)] public int Max = 100;
+
+        [Tooltip("Current hit points, visible for debugging.")]
+        [SerializeField] private int _current;
+
+        /// <summary>
+        /// Raised with the current and max hit points each time they change.
+        /// </summary>
+        public event Action<int, int> OnChange;
+
+        /// <summary>
+        /// Raised once, when the hit points reach zero.
+        /// </summary>
+        public event Action OnDied;
+
+        public int Current => _current;
+        public bool IsDead => _current <= 0;
+
+        #endregion
+
+        #region Public Methods
+
+        /// <summary>
+        /// Fills the hit points. Called by the owner in its Awake.
+        /// </summary>
+        public void Initialize()
+        {
+            SetCurrent(Max);
+        }
+
+        /// <summary>
+        /// Removes hit points and raises OnDied the first time they reach zero.
+        /// </summary>
+        public void TakeDamage(int amount)
+        {
+            if (IsDead || amount <= 0)
+                return;
+
+            SetCurrent(_current - amount);
+
+            if (IsDead)
+                OnDied?.Invoke();
+        }
+
+        /// <summary>
+        /// Gives hit points back without exceeding Max. Has no effect once dead.
+        /// </summary>
+        public void Heal(int amount)
+        {
+            if (IsDead || amount <= 0)
+                return;
+
+            SetCurrent(_current + amount);
+        }
+
+        #endregion
+
+        #region Private Methods
+
+        private void SetCurrent(int value)
+        {
+            _current = Mathf.Clamp(value, 0, Max);
+            OnChange?.Invoke(_current, Max);
+        }
+
+        #endregion
+    }
+}

Assets/_Content/Scripts/Combat/Health.cs.meta

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Assets/_Content/Scripts/Combat/IDamageable.cs

@@ -0,0 +1,10 @@
+namespace Arena.Combat
+{
+    /// <summary>
+    /// Anything that can receive damage: player, enemy, destructible object.
+    /// </summary>
+    public interface IDamageable
+    {
+        void TakeDamage(int amount);
+    }
+}

Assets/_Content/Scripts/Combat/IDamageable.cs.meta

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Assets/_Content/Scripts/PlayerMover.cs

@@ -1,53 +0,0 @@
-using System.ComponentModel;
-using UnityEngine;
-
-public class PlayerMover : MonoBehaviour
-{
-    [System.Serializable]
-    private class Settings
-    {
-        public float Speed = 5;
-    }
-
-    [System.Serializable]
-    private struct References
-    {
-        public CharacterController Controller;
-    }
-
-    [System.Serializable]
-    public class StateContainer
-    {
-        public bool IsJumping = false;
-    }
-
-#region FIELDS
-
-    const float MS_TO_KMH = 1 / 3.6f;
-    
-    [SerializeField] private Settings _settings;
-    [SerializeField] private References _references;
-    [SerializeField] private StateContainer _state;
-
-    public StateContainer State => _state;
-
-#endregion
-
-#region UNITY LIFECYCLES
-
-    void Update()
-    {
-        float t = Time.deltaTime;
-
-        Move(t);
-    }
-
-    private void Move(float t)
-    {
-        transform.position += Vector3.forward * t * MS_TO_KMH * _settings.Speed;
-    }
-
-#endregion
-
-
-}