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#16 Udemy 2.5D RPG - Enemies chasing player and attacking
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,27 @@ | ||
| using System; | ||
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| namespace Udemy25dRpg.Scenes.Characters.Enemy; | ||
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| public partial class EnemyAttackState : EnemyState | ||
| { | ||
| protected override void ExitState() | ||
| { | ||
| base.ExitState(); | ||
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| _characterNode.AnimatedSprite3DNode.AnimationFinished -= HandleAnimationFinished; | ||
| } | ||
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| protected override void EnterState() | ||
| { | ||
| base.EnterState(); | ||
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| _characterNode.AnimatedSprite3DNode.AnimationFinished += HandleAnimationFinished; | ||
| _characterNode.AnimatedSprite3DNode.Play(nameof(Enemy.EnemyAnimations.Attack)); | ||
| } | ||
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| private void HandleAnimationFinished() | ||
| { | ||
| _characterNode.StateMachineNode.SwitchState<EnemyChaseState>(); | ||
| } | ||
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| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,57 @@ | ||
| using Godot; | ||
| using System; | ||
| using System.Linq; | ||
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| namespace Udemy25dRpg.Scenes.Characters.Enemy; | ||
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| public partial class EnemyChaseState : EnemyState | ||
| { | ||
| private CharacterBody3D _target; | ||
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| [Export] public Timer TimerNode { get; set; } | ||
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| protected override void ExitState() | ||
| { | ||
| base.ExitState(); | ||
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| _characterNode.AttackAreaNode.BodyEntered -= HandleAttackAreaBodyEntered; | ||
| _characterNode.ChaseAreaNode.BodyExited -= HandleChaseAreaBodyExited; | ||
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| TimerNode.Timeout -= HandleTimerTimeout; | ||
| TimerNode.Stop(); | ||
| } | ||
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| protected override void EnterState() | ||
| { | ||
| base.EnterState(); | ||
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| _characterNode.AnimatedSprite3DNode.Play(nameof(Enemy.EnemyAnimations.Move)); | ||
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| _characterNode.AttackAreaNode.BodyEntered += HandleAttackAreaBodyEntered; | ||
| _characterNode.ChaseAreaNode.BodyExited += HandleChaseAreaBodyExited; | ||
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| _target = _characterNode.ChaseAreaNode.GetOverlappingBodies().OfType<CharacterBody3D>().First(); | ||
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| TimerNode.Timeout += HandleTimerTimeout; | ||
| TimerNode.Start(); | ||
| } | ||
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| private void HandleChaseAreaBodyExited(Node3D body) => _characterNode.StateMachineNode.SwitchState<EnemyReturnState>(); | ||
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| private void HandleAttackAreaBodyEntered(Node3D body) => _characterNode.StateMachineNode.SwitchState<EnemyAttackState>(); | ||
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| private void HandleTimerTimeout() | ||
| { | ||
| _destination = _target.GlobalPosition; | ||
| _characterNode.NavigationAgentNode.TargetPosition = _destination; | ||
| } | ||
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| public override void _PhysicsProcess(double delta) | ||
| { | ||
| base._PhysicsProcess(delta); | ||
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| Move(); | ||
| } | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -1,31 +1,63 @@ | ||
| using Godot; | ||
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| namespace Udemy25dRpg.Scenes.Characters.Enemy; | ||
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| public partial class EnemyPatrolState : StateMachineStateBase | ||
| public partial class EnemyPatrolState : EnemyState | ||
| { | ||
| [Export] | ||
| public Timer IdleTimerNode { get; set; } | ||
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| [Export(PropertyHint.Range, "0, 20, .1")] | ||
| public float MaxIdleTime { get; set; } = 4; | ||
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| private int _pathNodeIndex = 0; | ||
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| protected override void ExitState() | ||
| { | ||
| _characterNode.NavigationAgentNode.NavigationFinished -= HandleNavigationFinished; | ||
| _characterNode.ChaseAreaNode.BodyEntered -= HandleChaseAreaBodyEntered; | ||
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| IdleTimerNode.Timeout -= HandleTimerTimeout; | ||
| IdleTimerNode.Stop(); | ||
| } | ||
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| protected override void EnterState() | ||
| { | ||
| _characterNode.AnimatedSprite3DNode.Play(nameof(Enemy.EnemyAnimations.Move)); | ||
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| _pathNodeIndex = 1; | ||
| _destination = GetPointGlobalPosition(_pathNodeIndex); | ||
| _characterNode.NavigationAgentNode.TargetPosition = _destination; | ||
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| _characterNode.NavigationAgentNode.NavigationFinished += HandleNavigationFinished; | ||
| _characterNode.ChaseAreaNode.BodyEntered += HandleChaseAreaBodyEntered; | ||
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| IdleTimerNode.Timeout += HandleTimerTimeout; | ||
| IdleTimerNode.Start(); | ||
| } | ||
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| private void HandleTimerTimeout() | ||
| { | ||
| _characterNode.AnimatedSprite3DNode.Play(nameof(Enemy.EnemyAnimations.Move)); | ||
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| _pathNodeIndex = Mathf.Wrap(_pathNodeIndex + 1, 0, _characterNode.PathNode.Curve.PointCount); | ||
| _destination = GetPointGlobalPosition(_pathNodeIndex); | ||
| _characterNode.NavigationAgentNode.TargetPosition = _destination; | ||
| } | ||
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| private void HandleNavigationFinished() | ||
| { | ||
| _characterNode.AnimatedSprite3DNode.Play(nameof(Enemy.EnemyAnimations.Idle)); | ||
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| IdleTimerNode.WaitTime = new RandomNumberGenerator().RandfRange(0, MaxIdleTime); | ||
| IdleTimerNode.Start(); | ||
| } | ||
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| public override void _PhysicsProcess(double delta) | ||
| { | ||
| base._PhysicsProcess(delta); | ||
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| if (_characterNode.NavigationAgentNode.IsNodeReady() && _characterNode.NavigationAgentNode.IsNavigationFinished()) | ||
| { | ||
| if (_pathNodeIndex >= _characterNode.PathNode.Curve.PointCount) | ||
| { | ||
| _pathNodeIndex = 0; | ||
| } | ||
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| _characterNode.NavigationAgentNode.TargetPosition = | ||
| _characterNode.PathNode.Curve.GetPointPosition(_pathNodeIndex++) + | ||
| _characterNode.PathNode.GlobalPosition; | ||
| if (IdleTimerNode.IsStopped()) | ||
| { | ||
| Move(); | ||
| } | ||
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| _characterNode.Velocity = _characterNode.GlobalPosition.DirectionTo(_characterNode.NavigationAgentNode.TargetPosition); | ||
| _characterNode.MoveAndSlide(); | ||
| } | ||
| } |
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