unity get angle and rotatioin by speed

itween

  iTween.ValueTo(_maskPanel.gameObject, iTween.Hash(
            "onupdate", "_showMaskEffSizeDelta",
            "from", Vector2.zero,
            "to", new Vector2(1200, 1200),
            "easetype", iTween.EaseType.easeInCirc,
            "onupdatetarget", this.gameObject,
            "time", timeOfEffect
            ));
        iTween.ValueTo(_maskPanel.gameObject, iTween.Hash(
            "onupdate", "_showMaskEffPosition",
            "from", _rectMaskPanel.anchoredPosition,
            "to", Vector2.zero,
            "easetype", iTween.EaseType.easeInCirc,
            "time", timeOfEffect,
            "onupdatetarget", this.gameObject,
            "oncomplete", "ShowGame"
            ));

unity snippet

//unity get  angle and rotatioin by speed
float targetAngle = Mathf.Atan2(moveDirection.y, moveDirection.x) * Mathf.Rad2Deg;

transform.rotation = Quaternion.Slerp( transform.rotation, Quaternion.Euler( 0, 0, targetAngle ), turnSpeed * Time.deltaTime );

//mathf functoin
//http://wiki.unity3d.com/index.php/3d_Math_functions


#region TriggerEventsSetup

    // Use listener with no parameters
    private void AddEventTrigger(UnityAction action, EventTriggerType triggerType)
    {
        // Create a nee TriggerEvent and add a listener
        EventTrigger.TriggerEvent trigger = new EventTrigger.TriggerEvent();
        trigger.AddListener((eventData) => action()); // ignore event data

        // Create and initialise EventTrigger.Entry using the created TriggerEvent
        EventTrigger.Entry entry = new EventTrigger.Entry() { callback = trigger, eventID = triggerType };

        // Add the EventTrigger.Entry to delegates list on the EventTrigger
        eventTrigger.delegates.Add(entry);
    }

    // Use listener that uses the BaseEventData passed to the Trigger
    private void AddEventTrigger(UnityAction<BaseEventData> action, EventTriggerType triggerType)
    {
        // Create a nee TriggerEvent and add a listener
        EventTrigger.TriggerEvent trigger = new EventTrigger.TriggerEvent();
        trigger.AddListener((eventData) => action(eventData)); // capture and pass the event data to the listener

        // Create and initialise EventTrigger.Entry using the created TriggerEvent
        EventTrigger.Entry entry = new EventTrigger.Entry() { callback = trigger, eventID = triggerType };

        // Add the EventTrigger.Entry to delegates list on the EventTrigger
        eventTrigger.delegates.Add(entry);
    }

    // Use listener that uses additional argument
    private void AddEventTrigger(UnityAction<Toggle> action, EventTriggerType triggerType, Toggle toggle)
    {
        // Create a nee TriggerEvent and add a listener
        EventTrigger.TriggerEvent trigger = new EventTrigger.TriggerEvent();
        trigger.AddListener((eventData) => action(toggle)); // pass additonal argument to the listener

        // Create and initialise EventTrigger.Entry using the created TriggerEvent
        EventTrigger.Entry entry = new EventTrigger.Entry() { callback = trigger, eventID = triggerType };

        // Add the EventTrigger.Entry to delegates list on the EventTrigger
        eventTrigger.delegates.Add(entry);
    }

    #endregion
    

// singletion    
public class Singleton<T> : MonoBehaviour where T : MonoBehaviour
{
   protected static T instance;
 
   /**
      Returns the instance of this singleton.
   */
   public static T Instance
   {
      get
      {
         if(instance == null)
         {
            instance = (T) FindObjectOfType(typeof(T));
 
            if (instance == null)
            {
               Debug.LogError("An instance of " + typeof(T) + 
                  " is needed in the scene, but there is none.");
            }
         }
 
         return instance;
      }
   }
}