Script for Unity

SwingBat.cs

using UnityEngine;
using System.Collections;

public class SwingBat : MonoBehaviour {

  float r = 30; // Rotation Speed

	// Use this for initialization
	void Start () {
	
	}
	
	// Update is called once per frame
	void Update () {
    if (Input.GetMouseButton(0))  // Pressed left click
      transform.Rotate(0, -r, 0);
        	
	}
}