86 lines
3.3 KiB
C#
86 lines
3.3 KiB
C#
using Unity.AI.Navigation;
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using UnityEngine;
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using UnityEngine.AI;
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public class MeleeEnemy : Enemy
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{
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public float detectionRadius = 5f;
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public float patrollRadius = 3f;
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public float damage = 5f;
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public float attackRate = 1f;
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public float attackRadius = 1f;
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[SerializeField] Player target;
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[SerializeField] MeleeEnemyState currentState = MeleeEnemyState.Patrolling;
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Vector3 patrollingTarget;
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NavMeshAgent navMeshAgent;
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float currentDelay = 0;
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void Start() {
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if (!FindFirstObjectByType<NavMeshSurface>()) {
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Destroy(gameObject);
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return;
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}
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target = FindFirstObjectByType<Player>();
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navMeshAgent = GetComponent<NavMeshAgent>();
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patrollingTarget = GetPatrollingTarget();
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}
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void Update() {
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switch (currentState) {
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case MeleeEnemyState.Patrolling:
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if (CanSeeTarget()) currentState = MeleeEnemyState.Pursuing;
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else {
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if (Vector3.Distance(transform.position - new Vector3(0, navMeshAgent.baseOffset * transform.localScale.y), navMeshAgent.destination) <= 0.1f) patrollingTarget = GetPatrollingTarget();
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navMeshAgent.destination = patrollingTarget;
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}
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break;
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case MeleeEnemyState.Pursuing:
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if (!CanSeeTarget()) currentState = MeleeEnemyState.Patrolling;
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navMeshAgent.destination = target.transform.position;
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if (Vector3.Distance(transform.position, target.transform.position) <= attackRadius) currentState = MeleeEnemyState.Attacking;
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break;
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case MeleeEnemyState.Attacking:
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navMeshAgent.ResetPath();
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if (Vector3.Distance(transform.position, target.transform.position) >= attackRadius) currentState = CanSeeTarget() ? MeleeEnemyState.Pursuing : MeleeEnemyState.Patrolling;
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else if (currentDelay >= 1 / attackRate) {
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target.DealDamage(damage);
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currentDelay = 0;
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}
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break;
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}
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if (attackRate != 0) {
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if (currentState == MeleeEnemyState.Attacking) currentDelay = Mathf.Clamp(currentDelay += Time.deltaTime, 0, 1 / attackRate);
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else currentDelay = 0;
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}
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}
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Vector3 GetPatrollingTarget() {
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NavMeshPath path = new();
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while (true) {
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Vector2 circle = Random.insideUnitCircle * patrollRadius;
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Vector3 maybeDestination = transform.position + new Vector3(circle.x, 0, circle.y);
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NavMesh.CalculatePath(transform.position, maybeDestination, NavMesh.AllAreas, path);
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if (path.status == NavMeshPathStatus.PathComplete) return maybeDestination;
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if (path.status != NavMeshPathStatus.PathInvalid) break;
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}
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Vector3 destination = path.corners[^1];
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destination.y = transform.position.y;
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return destination;
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}
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bool CanSeeTarget() {Vector3 vectorToTarget = (target.transform.position - transform.position).normalized;
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bool canSee = false;
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if (Physics.Raycast(transform.position, vectorToTarget, out RaycastHit hit, detectionRadius)) {
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if (hit.transform.CompareTag("Player")) canSee = true;
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}
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return canSee;
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}
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}
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enum MeleeEnemyState {
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Patrolling,
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Pursuing,
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Attacking
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}
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