The Transition Control Timing System.

    //Variables used in the timing system

    TimeSpan _transitionTime=new TimeSpan(0,0,0,1,0);

    float _currentPercentage=0;

    bool _running=false;

 

    public float TransitionTime

    {

      get{return (float)_transitionTime.TotalSeconds;}

      set{_transitionTime=new TimeSpan(0,0,0,0,(int)(1000*value));}

    }

 

    //The moment at which the transition begins

    DateTime _startTime;

 

    //Called to start the transition off

    public void Go()

    {

      t=new System.Threading.Timer(new TimerCallback(Tick),null,40,40);

      this._currentPercentage=0;

      _running=true;

      _startTime=DateTime.Now;

      Invalidate();

    }

 

    //Services the tick event and re-calculates the percentage done

    void Tick(object state)

    {

      TimeSpan ts=DateTime.Now-this._startTime;

      _currentPercentage=(float)(100f / this._transitionTime.TotalSeconds * ts.TotalSeconds);

      if(_currentPercentage>100)

        _currentPercentage=100;

      Invalidate();

    }