Enemy Patrol Wait Time

Question

Hi, I'm looking for create an Enemy Patrol AI script

alt text

And I want to make him to Stop for several seconds on the edge of the platform or when he is detect the wall in front of him So I made the wall and edge detection check for him and he's moving quiet right. Check it in my video.

Enemy walking video on youtube

But I want to make him wait and stay for couple seconds in the moment when he detect the edge or wall I tried the WaitForSecond method but i'm not quiet sure how it works and made the float "Enemy Wait Time"

If you can please help me to solve this! :)

Here is the Code

 using UnityEngine;
 using System.Collections;
 
 public class EnemyPatrol : MonoBehaviour {
 
     public float moveSpeed;
     public bool moveRight;
 
     public Transform wallCheck;
     public float wallCheckRadius;
     public LayerMask whatIsWall;
     private bool hittingWall;
 
     private bool notAtEdge;
     public Transform edgeCheck;
 
     public float enemyWaitTime;
 
     void Start () 
     {
         
     }
         
     void Update () {
 
         hittingWall = Physics2D.OverlapCircle (wallCheck.position, wallCheckRadius, whatIsWall);
 
         notAtEdge = Physics2D.OverlapCircle (edgeCheck.position, wallCheckRadius, whatIsWall);
 
         if(hittingWall || !notAtEdge)
             moveRight = !moveRight;
         
         if (moveRight) 
         { 
             transform.localScale = new Vector3 (0.75f, 0.75f, 1f);
             GetComponent<Rigidbody2D>().velocity = new Vector2(moveSpeed, GetComponent<Rigidbody2D>().velocity.y);
         } else {
             transform.localScale = new Vector3 (-0.75f, 0.75f, 1f);
             GetComponent<Rigidbody2D>().velocity = new Vector2(-moveSpeed, GetComponent<Rigidbody2D>().velocity.y);
         }
     }
 
     IEnumerator WaitTime() {
         moveSpeed = 0;
         yield return new WaitForSeconds (enemyWaitTime);
         yield return 0;
     }
 }

Answer 1

Best Answer

Answer by ExtinctSpecie · Mar 06, 2017 at 10:12 PM

 float timer = 0.5f;
 if(hittingWall)
 {
     if(timer>0)
     {
         timer -= Time.deltaTime;
         return;
     }
     timer = 0.5f;
 }
 //we reset the timer again notice that this will execute only when hittingWall = true
 //so we reset the timer and it counts down again when hittingWall = true

Add comment · Show 4 · Share

Rembo4Fight · Mar 06, 2017 at 10:25 PM 0

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Do I add the code right? Enemy spin very fast now

 public float timer = 0.5f;
 
     public float enemyWaitTime;
 
     void Start () 
     {
         
     }
         
     void Update () {
 
         hittingWall = Physics2D.OverlapCircle (wallCheck.position, wallCheckRadius, whatIsWall);
 
         notAtEdge = Physics2D.OverlapCircle (edgeCheck.position, edgeCheckRadius, whatIsWall);
 
         if (hittingWall || !notAtEdge) 
         {
             if (timer > 0) 
             {
                 timer -= Time.deltaTime;
                 return;
             }
             timer = 0.5f;
         }
             
             moveRight = !moveRight;

ExtinctSpecie · Mar 07, 2017 at 09:29 AM 0

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         if (hittingWall || !notAtEdge) 
         {            
             if (timer > 0) 
             {
                 timer -= Time.deltaTime;
                 return;
             }
             moveRight = !moveRight;
             timer = 0.5f;
         }//put the moveRight = !moveRight inside if so the player can swap when he hits a wall and 0.5 seconds have passed

Rembo4Fight · Mar 08, 2017 at 03:28 PM 0

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Thank you very much! It work's

Rembo4Fight Rembo4Fight · Mar 09, 2017 at 01:03 PM 0

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Can you please help with the Speed on this script? I want to make that animation transition which is working on speed But how can i make here that speed is go machimatically to 0 and backwards to my parameter when the enemy is waiting? How to make Timer set the Speed smoothly to 0 and backward? PLEASE if you know how, help me on this one!

Answer 2

You never call WaitTime(), do you?

You should update this

      if(hittingWall || !notAtEdge)
          moveRight = !moveRight;

to

      if(hittingWall || !notAtEdge) {
          moveRight = !moveRight;
          StartCoroutine(WaitTime());
      }

Further introduce a bool "moving" somewhere in the class:

 private bool moving = true; // defaults to true, so the enemy moves at the beginning

And change WaitTime() to:

  IEnumerator WaitTime() {
      moving = false;
      yield return new WaitForSeconds (enemyWaitTime);
      moving = true;
  }

And at the start of Update():

 void Udate() {
     if(!moving)
         return;
 }

, so the enemy doesn't move when moving == false.

There are some other things I would suggest to change in your code, but only to name the most importent: Calling GetComponent() in Update() (i.e. every frame) several times is not a good idea. You should rather make the rigidBody a member variable and introduce an Awake()-Method...

 RigidBody2D rb;
 void Awake() {
     rb = GetComponent<RigidBody2D>();
 }

... and then, whenever you want to change something on the RigidBody2D, you just call

 rb.velocity = ...; // or whatever

.

Enemy Patrol Wait Time

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