Rotate object to joystick and position direction

i want to do rotate object to (joystick) position direction.

using UnityEngine; using System.Collections;

public class ipuclari : MonoBehaviour {

 joystick giriliVAl;

 Rigidbody2D mybody;

 public float speed;

 public float rotSpeed = 90f;


 void Start () 
 {
     giriliVAl = GameObject.FindGameObjectWithTag("Joystick").GetComponent<joystick>();
 }

 void Update()
 {
     Quaternion rot = transform.rotation;
     float z = rot.eulerAngles.z;
     z -= Input.GetAxis("Vertical") * Time.deltaTime * rotSpeed;
     rot = Quaternion.Euler( 0, 0, z );
     transform.rotation = rot;
     Vector3 pos = transform.position;

     transform.position += giriliVAl.giriliV * Time.deltaTime * speed;    
 }

}

`using UnityEngine; using UnityEngine.UI; using UnityEngine.EventSystems; using System.Collections;

public class joystick : MonoBehaviour, IPointerDownHandler,IPointerUpHandler,IDragHandler { Image joyArka; Image joys;

 public Vector3 giriliV;
 void Start()
 {
     joyArka = gameObject.transform.GetComponent<Image>();
     joys = gameObject.transform.GetChild(0).GetComponent<Image>();
 }

 public void OnDrag(PointerEventData ped)
 {
     Vector2 pozisyon;
     if(RectTransformUtility.ScreenPointToLocalPointInRectangle(joyArka.rectTransform,ped.position,ped.enterEventCamera, out pozisyon))
     {
         pozisyon.x = (pozisyon.x / joyArka.rectTransform.sizeDelta.x);
         pozisyon.y = (pozisyon.y / joyArka.rectTransform.sizeDelta.y);

         giriliV = new Vector3 (pozisyon.x * 2, pozisyon.y * 2);
         giriliV = (giriliV.magnitude > 1.0f) ? giriliV.normalized : giriliV;

         joys.rectTransform.anchoredPosition = new Vector3(giriliV.x * joys.rectTransform.sizeDelta.x/3, giriliV.y * joys.rectTransform.sizeDelta.y/3);
     }
 }

 public void OnPointerUp(PointerEventData ped)
 {
     giriliV = Vector3.zero;
     joys.rectTransform.anchoredPosition = Vector3.zero;

 }

 public void OnPointerDown (PointerEventData ped)
 {
     OnDrag(ped);
 }

}