gpd-924-en/AI/Assets/Scripts/FSM/IdleState.cs

using UnityEngine;

namespace DefaultNamespace.FSM
{
    public class IdleState : IState
    {
        private GameObject _owner;
        private PlayerController _player;

        private float _viewAngle;
        private float _cosViewAngle;

        public IdleState(GameObject owner, PlayerController player, float viewAngle)
        {
            _owner = owner;
            _player = player;
            _cosViewAngle = Mathf.Cos(viewAngle * Mathf.Deg2Rad);
        }
        
        public void Enter(IFiniteStateMachine ctx)
        {
            Debug.Log("IDLE: Enter");
        }

        public void Update(IFiniteStateMachine ctx)
        {
            Debug.Log("IDLE: Update");
            
            float angle = Vector3.Angle(_owner.transform.forward, _player.transform.position - _owner.transform.position);
            // if (angle > _viewAngle)
            // if (cosAngle > _cosViewAngle)
            
            // player visibility check
            if (Physics.Raycast(_owner.transform.position, _owner.transform.forward, out RaycastHit hit))
            {
                if (hit.transform.GetComponent<PlayerController>() == _player)
                {
                    ctx.SetState(new ChasePlayerState(_owner, _player));
                }
            }
        }

        public void Exit(IFiniteStateMachine ctx)
        {
            Debug.Log("IDLE: Exit");
        }
    }
}