138 lines
3.9 KiB
C#
138 lines
3.9 KiB
C#
using UnityEngine;
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[RequireComponent(typeof(Rigidbody2D))]
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public class EnemyController : MonoBehaviour
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{
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public GameObject playerObj;
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public float viewDistance = 5f;
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public float viewAngle = 60f;
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public float moveSpeed = 4f;
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public float acceleration = 10f;
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[SerializeField] private LayerMask obstacleMask;
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private Animator animator;
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private Rigidbody2D rb;
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private Vector2 targetVelocity = Vector2.zero;
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void Start()
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{
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rb = GetComponent<Rigidbody2D>();
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animator = GetComponent<Animator>();
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playerObj = GameManager.Instance.PlayerObj;
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if (playerObj == null)
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{
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playerObj = GameObject.FindGameObjectWithTag("Player");
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}
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}
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void FixedUpdate()
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{
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if (!playerObj) return;
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Vector2 playerCenter = (Vector2)playerObj.transform.position;
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if (PlayerInSight())
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{
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Vector2 toPlayer = playerCenter - (Vector2)transform.position;
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float dist = toPlayer.magnitude;
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if (dist > 0.01f)
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rb.linearVelocity = toPlayer / dist * moveSpeed;
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else
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rb.linearVelocity = Vector2.zero;
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}
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else
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{
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rb.linearVelocity = Vector2.MoveTowards(
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rb.linearVelocity, Vector2.zero, acceleration * Time.fixedDeltaTime);
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}
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animator.SetFloat("Speed", Mathf.Abs(rb.linearVelocity.magnitude));
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}
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void OnCollisionEnter2D(Collision2D collision)
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{
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if (collision.collider.CompareTag("Player"))
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{
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Rigidbody2D playerRb = collision.collider.GetComponent<Rigidbody2D>();
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PlayerController playerController = playerObj.GetComponent<PlayerController>();
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if (playerRb == null) return;
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Vector2 contactNormal = collision.GetContact(0).normal;
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if (contactNormal.y < -0.5f)
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{
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playerRb.linearVelocity = new Vector2(playerRb.linearVelocity.x, 35f);
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Die();
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}
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else
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{
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playerController.Die();
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}
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}
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else if (collision.collider.CompareTag("Projectile")) Die();
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}
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private bool PlayerInSight()
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{
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if (!playerObj) return false;
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Transform player = playerObj.transform;
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Vector2 eyePos = new(rb.position.x, rb.position.y + 1.45f);
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Vector2 toPlayer = (Vector2)player.position - eyePos;
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float dist = toPlayer.magnitude;
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if (dist > viewDistance) return false;
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Vector2 forward = (Vector2)transform.right;
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float cosHalf = Mathf.Cos(0.5f * viewAngle * Mathf.Deg2Rad);
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float dot = Vector2.Dot(forward.normalized, toPlayer / Mathf.Max(dist, 1e-6f));
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if (dot < cosHalf) return false;
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int mask = obstacleMask;
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mask &= ~(1 << gameObject.layer);
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mask &= ~(1 << playerObj.layer);
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Vector2 origin = eyePos + forward.normalized * 0.05f;
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RaycastHit2D hit = Physics2D.Raycast(origin, toPlayer.normalized, dist, mask);
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if (hit.collider != null) return false;
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return true;
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}
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void Die()
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{
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Destroy(gameObject);
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}
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#if UNITY_EDITOR
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private void OnDrawGizmos()
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{
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if (!playerObj) return;
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Vector2 origin = new(rb.position.x, rb.position.y + 1.45f);
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Vector2 forward = (Vector2)transform.right;
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float half = viewAngle * 0.5f;
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Vector2 edgeA = (Vector2)(Quaternion.Euler(0, 0, +half) * (Vector3)forward);
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Vector2 edgeB = (Vector2)(Quaternion.Euler(0, 0, -half) * (Vector3)forward);
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Gizmos.color = Color.yellow;
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Gizmos.DrawLine(origin, origin + edgeA * viewDistance);
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Gizmos.DrawLine(origin, origin + edgeB * viewDistance);
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Gizmos.DrawWireSphere(origin, viewDistance);
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Vector2 toPlayer = (Vector2)playerObj.transform.position - origin;
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if (toPlayer.magnitude <= viewDistance)
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{
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Gizmos.color = Color.red;
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Gizmos.DrawLine(origin, playerObj.transform.position);
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}
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}
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#endif
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}
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