In this Unity 2D tutorial, learn how to implement a smart enemy patrol system for your game. We’ll guide you through the process of creating an enemy that patrols between predefined points with smooth movement and basic AI behavior. By the end of the video, you'll be able to add dynamic and engaging enemy patrols to your game, enhancing both challenge and immersion. Perfect for beginners and intermediate developers looking to level up their game AI skills. Follow along and bring your 2D enemies to life!
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Script:
EnemyPatrol2D.cs
using System.Collections;
using UnityEngine;
public class EnemyPatrol2D : MonoBehaviour
{
public Transform[] waypoints; // Array to hold the waypoints
public float speed = 2.0f; // Speed of the patrol
public float waitTime = 2.0f; // Time to wait at each waypoint
private int currentWaypointIndex = 0; // Index of the current waypoint
private bool isWaiting = false; // To track if the enemy is currently waiting
private SpriteRenderer spriteRenderer; // Reference to the SpriteRenderer component
void Start()
{
spriteRenderer = GetComponent<SpriteRenderer>(); // Get the SpriteRenderer component
if (waypoints.Length > 0)
{
StartCoroutine(Patrol());
}
}
IEnumerator Patrol()
{
while (true)
{
if (!isWaiting)
{
MoveTowardsWaypoint();
// Check if the enemy has reached the waypoint
if (Vector3.Distance(transform.position, waypoints[currentWaypointIndex].position) < 0.1f)
{
StartCoroutine(WaitAtWaypoint());
}
}
yield return null; // Wait for the next frame
}
}
void MoveTowardsWaypoint()
{
if (waypoints.Length == 0)
return;
// Calculate the direction to the current waypoint
Vector3 direction = waypoints[currentWaypointIndex].position - transform.position;
float step = speed * Time.deltaTime; // Move speed per frame
// Flip the sprite based on movement direction
FlipSprite(direction.x);
// Move the enemy towards the waypoint
transform.position = Vector3.MoveTowards(transform.position, waypoints[currentWaypointIndex].position, step);
}
void FlipSprite(float directionX)
{
if (directionX > 0)
{
spriteRenderer.flipX = false; // Facing right
}
else if (directionX < 0)
{
spriteRenderer.flipX = true; // Facing left
}
}
IEnumerator WaitAtWaypoint()
{
isWaiting = true;
yield return new WaitForSeconds(waitTime); // Wait for the specified time
isWaiting = false;
currentWaypointIndex = (currentWaypointIndex + 1) % waypoints.Length; // Move to the next waypoint
}
}
