How to determine if an Enemy is moving left or right?

Questions & Answers
1

First, here’s the code

using UnityEngine;
using System.Collections;

public class BMoveAI : MonoBehaviour
{
	public Vector2 pos1;
	public Vector2 pos2;
	public float speed;

	void Update()
	{
		transform.position = Vector3.Lerp (pos1, pos2, Mathf.PingPong (Time.time * speed, 1.0f));
	}
}

So what I’m trying to do is make my Enemy’s sprite flip depending on whether he is moving left or right. So my question is how I would detect moving left or right?

3

You can also try this one

       public float oldPosition;
       public bool movingRight = false;
       public bool movingLeft = false;

     void LateUpdate(){
	oldPosition = transform.position.x;
}

void Update () {
	
	if (transform.position.x > oldPosition) {
		movingRight = true;
		movingLeft = false;
	}
	if (transform.position.x < oldPosition) {
		movingRight = false;
		movingLeft = true;
	}
2

You could store your character’s Y position in a variable, and then in the next frame check whether the new position is smaller or greater than the last one.
(Assuming Y axis is your horizontal, and it’s that way ->)
You might need to swap left and right depending on what your sprite looks like.

using UnityEngine;
using System.Collections;
 
private float oldPosition = 0.0f

public class BMoveAI : MonoBehaviour
{
	public Vector2 pos1;
	public Vector2 pos2;
	public float speed;

	void Start()
	{
		oldPosition = transform.position.y;
	}

     void Update()
	{
		transform.position = Vector3.Lerp (pos1, pos2, Mathf.PingPong (Time.time * speed, 1.0f));

		if (transform.position.y > oldPosition) // he's looking right
		{
			transform.localRotation = Quaternion.Euler(0, 0, 0);
		}

		if (transform.position.y < oldPosition) // he's looking left
		{
			transform.localRotation = Quaternion.Euler(0, 180, 0);
		}
		oldPosition = transform.position.y; // update the variable with the new position so we can chack against it next frame
	}
}