133 lines
3.5 KiB
C#
133 lines
3.5 KiB
C#
/*
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* author: lin hengrui ryan
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* date: 30/7/2024
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* description: AI code for the different AI in the game
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*/
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using System.Collections;
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using UnityEngine;
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using UnityEngine.AI;
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using Random = System.Random;
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public class AI : MonoBehaviour
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{
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/// <summary>
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/// to save resources when referring to the speed of this AI if its human
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/// </summary>
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private static readonly int AnimatorSpeed = Animator.StringToHash("Speed");
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/// <summary>
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/// set the layers the AI can be on
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/// </summary>
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public LayerMask walkableLayers;
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/// <summary>
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/// the destination coordinate of the AI
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/// </summary>
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public Vector3 destinationCoord;
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/// <summary>
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/// the range that the AI can set as their destination
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/// </summary>
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public int movingRange;
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/// <summary>
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/// the nav mash agent that is on this AI
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/// </summary>
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private NavMeshAgent _agent;
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/// <summary>
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/// the animator that is attached to this AI if applicable
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/// </summary>
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private Animator _animator;
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/// <summary>
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/// the current state that the AI is at this point in time
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/// </summary>
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private string _currentState;
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/// <summary>
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/// a bool to check if the destination point is set
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/// </summary>
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private bool _destinationPointSet;
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/// <summary>
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/// the state that the AI will be on the next update
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/// </summary>
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private string _nextState;
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/// <summary>
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/// to set initial values
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/// </summary>
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public void Awake()
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{
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_animator = GetComponent<Animator>();
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_currentState = "Strolling";
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_agent = GetComponent<NavMeshAgent>();
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_animator = GetComponent<Animator>();
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_currentState = "Strolling";
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_nextState = _currentState;
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ChangeState();
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}
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/// <summary>
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/// to update the speed of the AI to the animator each frame and to update any state changes to the AI
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/// </summary>
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public void Update()
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{
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_animator.SetFloat(AnimatorSpeed, _agent.velocity.magnitude);
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_currentState = _nextState;
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}
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/// <summary>
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/// to change the scene when needed
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/// </summary>
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private void ChangeState()
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{
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StartCoroutine(_currentState);
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}
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/// <summary>
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/// to set a random x and y coordinate for the AI to go to
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/// </summary>
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private void SearchWalkPoint()
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{
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var rand = new Random();
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float randomX = rand.Next(-movingRange * 100, movingRange * 100);
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float randomZ = rand.Next(-movingRange * 100, movingRange * 100);
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destinationCoord = new Vector3(
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transform.position.x + randomX / 100,
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transform.position.y,
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transform.position.z + randomZ / 100
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);
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if (Physics.Raycast(destinationCoord, -transform.up, 2f, walkableLayers)) _destinationPointSet = true;
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}
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/// <summary>
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/// a state that the AI wonders around using the SearchWalkPoint function to find a location for the AI to go to
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/// </summary>
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private IEnumerator Strolling()
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{
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SearchWalkPoint();
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while (_currentState == "Strolling")
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{
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if (!_destinationPointSet)
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SearchWalkPoint();
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else
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_agent.SetDestination(destinationCoord);
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if ((transform.position - destinationCoord).magnitude < 1f) _destinationPointSet = false;
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yield return new WaitForSeconds(1f);
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}
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ChangeState();
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}
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}
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