rotate.cs

public class LockOn : MonoBehaviour {
	GameObject target = null;
	// Use this for initialization
	void Start () {
	
	}

	// Update is called once per frame
	void Update () {
		if(target != null) {
			var dir = target.transform.position - transform.position;
			var angle = Mathf.Atan2(dir.y, dir.x) * Mathf.Rad2Deg;
			transform.rotation = Quaternion.AngleAxis(angle, Vector3.forward);
		}
	}
	void OnTriggerEnter2D(Collider2D col) {
		Debug.Log("asdsd");
		if(col.tag == "Player") {
			Debug.Log("ey");
			target = col.gameObject;
		}
	}
	void OnTriggerExit2D(Collider2D col) {
		target = null;
	}
}