Fractrace.Iterate.SetOldData C# (CSharp) Method

        public void SetOldData(DataTypes.GraphicData oldData, DataTypes.PictureData oldPictureData, int updateCount)
        {
            _oldData = oldData;
            _oldPictureData = oldPictureData;
            _updateCount = updateCount;
        }

 /// <summary>
 /// Start Computing. Is called while rendering an animation. 
 /// </summary>
 public void Run(int updateSteps)
 {
     _currentProgress = 0;
     _master.Progress(_currentProgress);
     System.Diagnostics.Debug.WriteLine("PaintJob.Run " + updateSteps.ToString());
     _parameters = ParameterDict.Current.Clone();
     _updateSteps = updateSteps;
     _currentProgressd = 100.0 / (double)(_updateSteps);
     for (int i = 0; i < _updateSteps; i++)
     {
         if (_abort)
             return;
         _iterate = new Iterate(_parameters, this, false);
         if (_lastIterate != null)
         {
             _iterate.SetOldData(_lastIterate.GraphicInfo,_lastIterate.PictureData,i);
         }
         if (_abort)
             return;
         _iterate.StartAsync();
         _iterate.Wait();
         if (_abort)
             return;
         _lastIterate = _iterate;
         _currentProgress += _currentProgressd;
         _master.Progress(_currentProgress);
     }
     Renderer renderer = PictureArtFactory.Create(_iterate.PictureData, _iterate.LastUsedFormulas);
     renderer.Paint(_graphics);
     if (_abort)
         return;
     _master.Progress(0);
 }