using UnityEngine;
using System.Collections;

public class PingPongMove:MonoBehaviour {

    public Transform reference;
    public Vector3 amplitue;
    public float speed;

    Vector3 referencePos = Vector3.zero;

    void OnEnable() {
        referencePos = reference == null ? this.transform.localPosition : reference.localPosition;
    }

    float x = 0f;
    float y = 0f;
    float z = 0f;
    void LateUpdate() {

        if(Mathf.Abs(amplitue.x) > 0.001f) {
            x = referencePos.x - amplitue.x * 0.5f + Mathf.PingPong(Time.time * speed,amplitue.x);
        }
        else {
            x = referencePos.x;
        }

        if(Mathf.Abs(amplitue.y) > 0.001f) {
            y = referencePos.y - amplitue.y * 0.5f + Mathf.PingPong(Time.time * speed,amplitue.y);
        }
        else {
            y = referencePos.y;
        }

        if(Mathf.Abs(amplitue.z) > 0.001f) {
            z = referencePos.z - amplitue.z * 0.5f + Mathf.PingPong(Time.time * speed,amplitue.z);
        }
        else {
            z = referencePos.z;
        }

        this.transform.localPosition = new Vector3(x,y,z);
    }

}