83 lines
2.7 KiB
C#
83 lines
2.7 KiB
C#
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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 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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private float attackRangeSquared = 5f;
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private Transform target = null;
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private bool canShoot => (target.transform.position - transform.position).sqrMagnitude < attackRangeSquared && target != null;
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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 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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UpdateTarget(FindObjectOfType<Player.PlayerController>()?.transform);
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}
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protected void Update()
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{
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remainingCooldown -= Time.deltaTime;
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if (remainingCooldown <= 0f && canShoot)
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Shoot();
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}
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protected 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);
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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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OnShoot?.Invoke();
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}
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private 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 void UpdateTarget(Transform transform) => target = transform;
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private 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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