Tracking transform position

Question

So I have a script that takes the enemy and moves it between its starting position and the transform position of another hidden game object. The script works fine for the movement. However, I want the script to only run if the player isn't seen and then resume playing once the player is not seen once again. I have it tracking the location, but when I switch the bool, it jumps forward like the script was still working even though that code should not be running anymore due to the flag being set. I want it to stop and resume from the same place, but I'm hitting a wall at figuring it out. Code below:

 #region Notes Section
 /*
 
 Author: Paul Christopher
 Use: This code handles movement for the enemies
 Notes: Enemy moves back and forth at a random speed to a target point and back. (Cycle repeats)
 
 */
 #endregion
 
 using UnityEngine;
 using System;
 using System.Collections;
 
 public class EnemyMovement : Enemy {
 
     #region Variables
     //Movement Target
     public Transform farEnd;
 
     //Locations
     private Vector3 startLoc;
     private Vector3 targetLoc;
     private Vector3 currentLoc;
 
     //Time to complete one length
     System.Random rnd = new System.Random();
     public float secondsToComplete;
     #endregion
 
     #region Start
     // Use this for initialization
     void Start ()
     {
         //Movement
         startLoc = transform.position;
         targetLoc = farEnd.position;
 
         //Random
         secondsToComplete = rnd.Next(5, 15); //Sets random to be between 5 & 15 inclusive
     }
     #endregion
 
     #region Update
     // Update is called once per frame
     void Update ()
     {
         //Move if player is not seen
         if (!playerSeen)
         {
             StartCoroutine("Movement");
         }
         
         if (playerSeen)
         {
             StopCoroutine("Movement");
             transform.position = currentLoc;
         }
     }
     #endregion
 
 
     IEnumerator Movement()
     {
         //Moves enemy model between starting location (currentLoc) and a point (targetLoc). 
         //Model will continually move back and forth (as of right now)
         transform.position =
                 Vector3.Lerp(startLoc, targetLoc,
                 Mathf.SmoothStep(0f, 1f,
                 Mathf.PingPong(Time.time / secondsToComplete, 1f)));
 
         currentLoc = transform.position;
 
         yield return null;
     }
 
     //END OF FILE BELOW
 }

Answer 1

Best Answer

Answer by TBruce · Apr 29, 2016 at 07:43 PM

@Paul2357

Add this global

 private Coroutine movementCoroutine = null;

and the change Update() function to this

 void Update ()
 {
     //Move if player is not seen
     if (!playerSeen)
     {
         movementCoroutine = StartCoroutine(Movement());
     }
     else if (movementCoroutine != null)
     {
         StopCoroutine(movementCoroutine);
         movementCoroutine = null
         transform.position = currentLoc;
     }
 }

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Paul2357 · Apr 30, 2016 at 12:26 AM 0

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@mavina the problem when I do that, the gameobject I have as a placeholder for the enemy launches into the air when playerSeen is true :-/

TBruce Paul2357 · Apr 30, 2016 at 07:53 PM 0

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@Paul2357

After rereading your question I gather what you are attempting to do is pause the Lerp when playerSeen is true. If this is the case you can do that with the following code

 using UnityEngine;
 using System;
 using System.Collections;
 using System.Collections.Generic;
 
 public class EnemyMovement : MonoBehaviour {
 
     #region Variables
     //Movement Target
     public Transform farEnd;
 
     //Locations
     public Vector3 startLoc;
 
     public Vector3 targetLoc;
     public Vector3 currentLoc;
 
     //Time to complete one length
     System.Random rnd = new System.Random();
     public float secondsToComplete;
     public bool playerSeen = false;
     public bool savePlayerSeen = false;
     float step;
     
     bool dirRight = true;
     float speed = 3;
 
     #endregion
 
     #region Start
     // Use this for initialization
     void Start ()
     {
         //Movement
         startLoc = transform.position;
         targetLoc = farEnd.position;
 
         //Random
         secondsToComplete = rnd.Next(5, 15); //Sets random to be between 5 & 15 inclusive
         savePlayerSeen = playerSeen;
 
         currentLoc = startLoc;
     }
     #endregion
 
     #region Update
     void Update ()
     {
         if (!playerSeen)
         {
             if (dirRight)
                 transform.Translate (Vector2.right * speed * Time.deltaTime);
             else
                 transform.Translate (-Vector2.right * speed * Time.deltaTime);
     
             if( transform.position.x >= targetLoc.x)
             {
                 dirRight = false;
             }
     
             if(transform.position.x <= startLoc.x)
             {
                 dirRight = true;
             }
         }
     }
     #endregion
 
     //END OF FILE BELOW
 }

Paul2357 TBruce · Apr 30, 2016 at 08:25 PM 0

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@mavina

That works as long as I freeze the Y position of my enemy. (which I don't think I'll need them moving on the Y axis so that shouldn't be a problem). Thanks!

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Tracking transform position

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