Enemy pathfinding AI

Scripts/Enemy.cs

@@ -12,6 +12,8 @@ public partial class Enemy : CharacterBody2D
 
 	[Export] public float WalkSpeed = 2500f;
 
+	[Export] public float PlayerDisengageRange = 500f;
+
 	[Export] public Weapon EquippedWeapon;
 
 	private float _currentHealth = 0f;
@@ -20,6 +22,10 @@ public partial class Enemy : CharacterBody2D
 	
 	private NavigationAgent2D _navigationAgent;
 	
+	private bool _isPlayerInRange = false;
+	
+	private Vector2? _lastPlayerPosition = null;
+	
 	[Export] public bool NavigationEnabled { get; set; } = false;
 
 	// Called when the node enters the scene tree for the first time.
@@ -29,13 +35,13 @@ public partial class Enemy : CharacterBody2D
 		
 		_navigationAgent = GetNode<NavigationAgent2D>("NavigationAgent2D");
 
-		CallDeferred("Setup");
+		//CallDeferred("Setup");
 	}
 
-	private void Setup()
-	{
-		
-	}
+	// private void Setup()
+	// {
+	// 	
+	// }
 	
 	// Called every frame. 'delta' is the elapsed time since the previous frame.
 	public override void _Process(double delta)
@@ -45,10 +51,7 @@ public partial class Enemy : CharacterBody2D
 			case EnemyState.Idle:
 
 				break;
-
-			case EnemyState.Primed:
-				// Have the raycast follow the player and shoot if visible
-				//HandlePlayerDetection();
+			case EnemyState.Alert:
 				break;
 
 			//case EnemyState.Shooting:
@@ -61,17 +64,29 @@ public partial class Enemy : CharacterBody2D
 
 	public override void _PhysicsProcess(double delta)
 	{
-		if (NavigationEnabled)
+		switch (_currentState)
 		{
-			// Only do these actions if the enemy has been alerted
-			if (_currentState is EnemyState.Primed)
-			{
-				_navigationAgent.SetTargetPosition(_cachedPlayer.GlobalPosition);
+			case EnemyState.Idle:
+				HandlePlayerDetection();
+
+				break;
+			case EnemyState.Alert:
+
+				// Update last known player position if it's in range
+				if (_isPlayerInRange)
+				{
+					_lastPlayerPosition = _cachedPlayer.GlobalPosition;
+				}
+
+				if (_lastPlayerPosition.HasValue)
+				{
+					_navigationAgent.SetTargetPosition(_lastPlayerPosition.Value);
+				}
 				
 				var currentAgentPosition = GlobalPosition;
 			
 				var nextPathPosition = _navigationAgent.GetNextPathPosition();
-
+				
 				var newVelocity = currentAgentPosition.DirectionTo(nextPathPosition) * (float)(WalkSpeed * delta);
 				
 				
@@ -79,7 +94,10 @@ public partial class Enemy : CharacterBody2D
 				if (_navigationAgent.IsNavigationFinished())
 				{
 					// Shoot player
-					HandlePlayerDetection();
+					Shoot();
+					
+					// TODO: If player totally left the max range it should stop shooting and go back to idle
+					
 					return;
 				}
 				
@@ -95,7 +113,11 @@ public partial class Enemy : CharacterBody2D
 
 				MoveAndSlide();
 				
-			}
+				break;
+			case EnemyState.Patrolling:
+				break;
+			default:
+				throw new ArgumentOutOfRangeException();
 		}
 	}
 	
@@ -107,7 +129,7 @@ public partial class Enemy : CharacterBody2D
 
 	private void HandlePlayerDetection()
 	{
-		if (_cachedPlayer == null || _currentState is not EnemyState.Primed)
+		if (_cachedPlayer == null)
 		{
 			return;
 		}
@@ -119,17 +141,18 @@ public partial class Enemy : CharacterBody2D
 			// {
 			// 	_navigationAgent.SetTargetPosition(_cachedPlayer.GlobalPosition);
 			// }
-			Shoot();
-
+			//Shoot();
 			
+			_currentState = EnemyState.Alert;
 		}
 	}
 
 	private void Shoot()
 	{
-		if (EquippedWeapon == null) return;
+		if (EquippedWeapon == null || !_lastPlayerPosition.HasValue) return;
 
-		EquippedWeapon.ShootDirection = (_cachedPlayer.GlobalPosition - this.GlobalPosition).Normalized();
+		// Shoot at the player's last known position
+		EquippedWeapon.ShootDirection = (_lastPlayerPosition.Value - this.GlobalPosition).Normalized();
 		
 		EquippedWeapon.Shoot();
 		
@@ -176,19 +199,23 @@ public partial class Enemy : CharacterBody2D
 			Debug.WriteLine("Enemy detection area Entered by interaction controller");
 
 			_cachedPlayer = player;
-			if (_currentState is EnemyState.Idle)
-			{
-				_currentState = EnemyState.Primed;
-			}
+
+			_isPlayerInRange = true;
+			// if (_currentState is EnemyState.Idle)
+			// {
+			// 	_currentState = EnemyState.Primed;
+			// }
 		}
 	}
 
 	private void _on_player_detection_area_exited(Area2D area)
 	{
-		if (_currentState is EnemyState.Primed)
-		{
-			_currentState = EnemyState.Idle;
-		}
+		_isPlayerInRange = false;
+
+		// if (_currentState is EnemyState.Primed)
+		// {
+		// 	_currentState = EnemyState.Idle;
+		// }
 	}
 	
 	private void _on_damage_hitbox_area_entered(Area2D area)
@@ -231,7 +258,7 @@ public partial class Enemy : CharacterBody2D
 	private enum EnemyState
 	{
 		Idle,
-		Primed,
+		Alert,
 		Patrolling
 	}
 }