Rotate a Cube on swipe gesture iOS, for a specific time?

Hi !

I am trying to make a 3D Menu of cube , what I want is to rotate cube on swipe. To see all the sides of cube and select any side by rotating cube in every direction I want I got the swipe gestures working properly by using (Fingure Gesture), I want to rotate cube in the direction of swipe with the swipe velocity , now the problem is when I want to rotate it only for the time till it completes an angle which is respect to the velocity of swipe. So any help please. Cause i have been trying and playing with Quaternions and its really messy .

Here is the code for rotation on swipes: using UnityEngine; using System.Collections;

 public class BasicMethodTap : MonoBehaviour {
     
     Vector3 heading;
     public float pinchScaleFactor = 0.02f;
     bool Pinching;
     float fov;
     float minFov = 40f;
     float maxFov = 100f;
     float rotateFrom;
     float rotateTo;
     float sensitivity= 0.02f;
     
     // variables for cube rotation control
     public float rotateSpeed;
     public int rotateDirection;
     public Quaternion targetRotation;
     public bool shouldRotate;
     public float angle;
     public float maxSpin;
     // Use this for initialization
     void OnEnable () {
     
         FingerGestures.OnTap += FingureGestures_OnTap;
         FingerGestures.OnFingerSwipe += FingerGestures_OnFingerSwipe;
         FingerGestures.OnPinchBegin += FingerGestures_OnPinchBegin;
         FingerGestures.OnPinchMove += FingerGestures_OnPinchMove;
         FingerGestures.OnPinchEnd += FingerGestures_OnPinchEnd;
     }
     // Update is called once per frame
     void FingureGestures_OnTap (Vector2 fingurePos, int tapCount) {
     
         Debug.Log ("Tapped:" +tapCount + "times(s) at " + fingurePos );
     }
     
  // spin the yellow cube when swipping it
     void FingerGestures_OnFingerSwipe( int fingerIndex, Vector2 startPos, FingerGestures.SwipeDirection direction, float velocity )
     {
          // convert the swipe direction to a 3D vector we can use as our new forward direction for the particle emitter
         if( direction == FingerGestures.SwipeDirection.Up )
             heading = Vector3.left;
         else if( direction == FingerGestures.SwipeDirection.Down )
             heading = Vector3.right;
         else if( direction == FingerGestures.SwipeDirection.Right )
             heading = Vector3.down;
         else if( direction == FingerGestures.SwipeDirection.Left )
             heading = Vector3.up;    
         
         print ("Swiped to Direction :"+direction); 
         print("Vector:"+heading +"Velocity:" +velocity);
         
         angle=velocity;
         //transform.RotateAround(transform.position, heading, velocity * Time.deltaTime);
         
     }
     
     
      void FingerGestures_OnPinchBegin( Vector2 fingerPos1, Vector2 fingerPos2 )
     {
         Pinching = true;
     }
 
     void FingerGestures_OnPinchMove( Vector2 fingerPos1, Vector2 fingerPos2, float delta )
     {
         if( Pinching)
         {
             // to scale up and down  object
            //this.transform.localScale += delta * pinchScaleFactor * Vector3.one;
             
             // to zoom in/out camera on pinch
             
             print ("delta:"+ delta);
             delta *=-(1f);
             print ("delta:"+ delta);
             fov = Camera.main.fieldOfView;
               fov += delta * sensitivity;
               fov = Mathf.Clamp(fov, minFov, maxFov);
               Camera.main.fieldOfView = fov;
             
             
         }
     }
 
     void FingerGestures_OnPinchEnd( Vector2 fingerPos1, Vector2 fingerPos2 )
     {
         if(Pinching)
         {
             Pinching= false;
         }
     }
     
     void Start()
     {
         //shouldRotate=false;
     }
     void Update()
     {
     transform.RotateAround(this.transform.position,heading,angle*Time.deltaTime);
     }
     
     void OnDisable () {
     
         FingerGestures.OnFingerSwipe -= FingerGestures_OnFingerSwipe;
         FingerGestures.OnTap -= FingureGestures_OnTap;
         
         FingerGestures.OnPinchBegin -= FingerGestures_OnPinchBegin;
         FingerGestures.OnPinchMove -= FingerGestures_OnPinchMove;
         FingerGestures.OnPinchEnd -= FingerGestures_OnPinchEnd;
     }
     
 }