Rotate object with mouse click or touch in Unity3D

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Part - 1
Part - 2
If you want to rotate an object, like wheel in unity3D.
For c#, go ahead and create c# script in unity and name it whatever you want then attached it to the object you want to rotate. Then, type following in the script.

using UnityEngine;
using System.Collections;

public class rotate : MonoBehaviour {
    private float baseAngle = 0.0f;

    void OnMouseDown(){
       Vector3 pos = Camera.main.WorldToScreenPoint(transform.position);
       pos = Input.mousePosition - pos;
       baseAngle = Mathf.Atan2(pos.y, pos.x) * Mathf.Rad2Deg;
       baseAngle -= Mathf.Atan2(transform.right.y, transform.right.x) *Mathf.Rad2Deg;
    }

    void OnMouseDrag(){
        Vector3 pos = Camera.main.WorldToScreenPoint(transform.position);
        pos = Input.mousePosition - pos;

"color: #f7f7f1;">        float ang = Mathf.Atan2(pos.y, pos.x) *Mathf.Rad2Deg - baseAngle;
        transform.rotation = Quaternion.AngleAxis(ang, Vector3.forward);
    }
}

For javascript, type followings.

#pragma strict
    private var baseAngle = 0.0;

    function OnMouseDown(){
       var pos = Camera.main.WorldToScreenPoint(transform.position);
       pos = Input.mousePosition - pos;
       baseAngle = Mathf.Atan2(pos.y, pos.x) * Mathf.Rad2Deg;
       baseAngle -= Mathf.Atan2(transform.right.y, transform.right.x) *Mathf.Rad2Deg;
    }

    function OnMouseDrag(){
        var pos = Camera.main.WorldToScreenPoint(transform.position);
        pos = Input.mousePosition - pos;
        var ang = Mathf.Atan2(pos.y, pos.x) *Mathf.Rad2Deg - baseAngle;
        transform.rotation = Quaternion.AngleAxis(ang, Vector3.forward);
    }

It should do the magic.

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