NPC Movement

Questions & Answers
1

i have a code that works with an npc to make it move by its self but i was wondering if anyone knew how i could change the bottom lines of code so that it alternated between 1 and -1 and not pick a random number?
here is the code, can anyone help me please?

public class npc_movement : MonoBehaviour
{
    public float speed;
    public float moveRate;

    public int dirX;
    public int dirY;

    private float moveCounter;

    private new Rigidbody2D rigidbody2D {get{return GetComponent<Rigidbody2D>() ?? default(Rigidbody2D); }}

    private void Update()
    {
        if (rigidbody2D)
        {
            if (moveCounter > moveRate)
            {
                ChangeDirection();
                moveCounter = 0f;
            }
        
            Vector2 vel = new Vector2(dirX * speed, dirY * speed);

            rigidbody2D.velocity = Vector2.Lerp(rigidbody2D.velocity, vel, Time.deltaTime * 10f);
        
            moveCounter += Time.deltaTime;
        
        }
    }

    private void ChangeDirection ()
    {
        dirX = Random.Range(-1, 1); 
        dirY = Random.Range(-1, 1); 
    }



}
2

Hi @Chazmeister,

if you just want alternating numbers from -1 to 1 and back, why not just use the - operation?

Example:

int lastDirX = 1;

private void ChangeDirection(){
  dirX = -lastDirX;
  lastDirX = -lastDirX;
}

and of course the same for dirY