void AddMask()
{
if (tmpRect.ActualWidth != 0 && tmpRect.ActualHeight != 0)
{
RectMarkers.Add(tmpRect);
MainWindow mv = Application.Current.Windows.OfType <MainWindow>().FirstOrDefault();
double x = Canvas.GetLeft(tmpRect);
double y = Canvas.GetTop(tmpRect);
tmpText = DrawCanvas.Text(x, y, (TextMarkers.Count + 1).ToString(), true, Brushes.Yellow, mv.CanvasResult, false);
TextMarkers.Add(tmpText);
tmpRect = new Rectangle();
tmpText = new TextBlock();
OnPropertyChanged("MaskCounts");
}
}