feat: Player

Assets/_Content/Scripts/Combat/Projectile.cs

@@ -0,0 +1,68 @@
+using UnityEngine;
+
+namespace Arena.Combat
+{
+	/// <summary>
+	/// Moves straight ahead and damages the first IDamageable it touches.
+	/// Needs a trigger collider and a kinematic Rigidbody.
+	/// </summary>
+	[RequireComponent(typeof(Rigidbody))]
+	public class Projectile : MonoBehaviour
+	{
+		[System.Serializable]
+		public class Settings
+		{
+			[Tooltip("Speed, in meters per second.")]
+			[Min(0f)] public float Speed = 20f;
+
+			[Tooltip("Time before an unused projectile is destroyed, in seconds.")]
+			[Min(0.1f)] public float Lifetime = 2f;
+		}
+
+		#region Fields
+
+		[SerializeField] private Settings _settings;
+
+		private int _damage;
+		private GameObject _owner;
+
+		#endregion
+
+		#region Unity Lifecycle
+
+		private void Update()
+		{
+			transform.position += transform.forward * _settings.Speed * Time.deltaTime;
+		}
+
+		private void OnTriggerEnter(Collider other)
+		{
+			// Ignore the shooter and the other trigger zones
+			if (other.isTrigger || other.gameObject == _owner)
+				return;
+
+			if (other.TryGetComponent(out IDamageable target))
+				target.TakeDamage(_damage);
+
+			Destroy(gameObject);
+		}
+
+		#endregion
+
+		#region Public Methods
+
+		/// <summary>
+		/// Starts the projectile. Called right after Instantiate by whoever fires it.
+		/// </summary>
+		/// <param name="damage">Damage dealt to the IDamageable it touches.</param>
+		/// <param name="owner">Shooter, ignored by the projectile.</param>
+		public void Launch(int damage, GameObject owner)
+		{
+			_damage = damage;
+			_owner = owner;
+			Destroy(gameObject, _settings.Lifetime);
+		}
+
+		#endregion
+	}
+}