i have a mouse script and i want the script to work with my right joystick. Please help.

i have this script using which i can make my player to look in the direction of the mouse cursor. i want the same functionality for my right joystick. like if i move my joystick up the player should look in positive z direction and so forth. please help me.

using UnityEngine; using System.Collections;

public class LookTowardMouse : MonoBehaviour {

 void Update () 
 {
     //Get the Screen positions of the object
     Vector2 positionOnScreen = Camera.main.WorldToViewportPoint (transform.position);
     
     //Get the Screen position of the mouse
     Vector2 mouseOnScreen = (Vector2)Camera.main.ScreenToViewportPoint(Input.mousePosition);
     
     //Get the angle between the points
     float angle = AngleBetweenTwoPoints(positionOnScreen, mouseOnScreen)+90;


     transform.rotation =  Quaternion.Euler (new Vector3(0f, -angle, 0f));
 }

 float AngleBetweenTwoPoints(Vector3 a, Vector3 b) {
     return Mathf.Atan2(a.y - b.y, a.x - b.x) * Mathf.Rad2Deg;
 }

}