122 lines
4.0 KiB
C#
122 lines
4.0 KiB
C#
using System.Collections;
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using Movement;
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using Pausable;
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using UnityEngine;
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using UnityEngine.Events;
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namespace AI
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{
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public class ShootingEnemyAI : MonoBehaviour, IPausable
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{
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[SerializeField] protected float focusingTime = .5f;
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[SerializeField] protected float attacksPerSecond = 1f;
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[SerializeField] protected float attackRange = 5f;
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[SerializeField] protected float timeForProjectileToHit = .25f;
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protected float cooldownPerShoot = 0f;
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protected float remainingCooldown = 0f;
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protected float attackRangeSquared = 5f;
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protected Transform target = null;
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protected bool isShooting = false;
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protected IMovement movement = null;
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protected Animator animator = null;
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protected AudioSource audioSource = null;
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protected int layerMask = ~(1 << 9);
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protected bool canShoot => target != null && (target.transform.position - transform.position).sqrMagnitude < attackRangeSquared;
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public UnityEvent OnShoot { get; protected set; } = null;
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#region IPausable
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public bool IsPaused { get; protected set; } = false;
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public virtual void Pause() => IsPaused = true;
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public virtual void Resume() => IsPaused = false;
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#endregion
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protected virtual void Awake()
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{
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cooldownPerShoot = 1f / attacksPerSecond;
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attackRangeSquared = attackRange * attackRange;
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OnShoot = new UnityEvent();
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}
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protected virtual void Start()
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{
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movement = transform.GetComponentInParent<IMovement>();
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animator = transform.GetComponentInParent<Animator>();
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audioSource = transform.GetComponentInParent<AudioSource>();
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UpdateTarget(FindObjectOfType<Player.PlayerController>()?.transform);
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}
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protected virtual void Update()
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{
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if (IsPaused)
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return;
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remainingCooldown -= Time.deltaTime;
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if (canShoot && !isShooting)
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StartCoroutine(ShootCoroutine());
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}
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protected IEnumerator ShootCoroutine()
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{
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isShooting = true;
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float movementBaseSpeed = movement.BaseSpeed;
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movement.BaseSpeed = 0f;
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animator.SetBool("isAttacking", true);
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yield return new WaitForSeconds(focusingTime);
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while (canShoot)
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{
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if (remainingCooldown <= 0f)
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Shoot();
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yield return null;
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}
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movement.BaseSpeed = movementBaseSpeed;
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animator.SetBool("isAttacking", false);
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remainingCooldown = 0f;
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isShooting = false;
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}
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protected virtual void Shoot()
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{
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Projectile projectile = ProjectilePool.Instance.Get();
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projectile.transform.position = transform.position;
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Vector3 velocity = GetVelocityForProjectile(timeForProjectileToHit);
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RaycastHit2D raycastHit2D = Physics2D.Raycast(transform.position, target.position - transform.position, attackRange, layerMask);
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if (raycastHit2D.transform != target)
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velocity = GetVelocityForProjectile(timeForProjectileToHit * 2);
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projectile.SetVelocity(velocity);
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remainingCooldown = cooldownPerShoot;
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audioSource.Play();
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OnShoot?.Invoke();
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}
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protected Vector3 GetVelocityForProjectile(float time)
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{
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Vector3 vector3 = target.position - transform.position;
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vector3.z = 0f;
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vector3.y -= (Physics2D.gravity.y / 2) * (time * time);
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vector3 /= time;
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return vector3;
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}
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public virtual void UpdateTarget(Transform transform) => target = transform;
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protected virtual void OnDrawGizmosSelected()
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{
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Gizmos.color = Color.yellow;
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Gizmos.DrawWireSphere(transform.position, 0.125f);
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Gizmos.color = Color.red;
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Gizmos.DrawWireSphere(transform.position, attackRange);
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}
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}
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}
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