Windows phone 8.1 ink manager alternative

I have an universal app and the windows version use ink manager to capture a signature. I want to do the same with the phone but the ink manager dont exist. Does anyone have or know an alternative.

I added a canvas named Display and add this code using two events.

  private Point _currentPoint;
    private Point _oldPoint;


    private async void Display_PointerMoved(object sender, PointerRoutedEventArgs e)
    {
        DrawPoint(e);
    }

    private void DrawPoint(PointerRoutedEventArgs e)
    {

        _currentPoint = e.GetCurrentPoint(this).Position;

        Line linea = new Line
        {
             Stroke = new SolidColorBrush(Colors.Black),
             StrokeThickness=1,
             X1 = _currentPoint.X,
             Y1 = _currentPoint.Y,
             X2 = _oldPoint.X,
             Y2 = _oldPoint.Y
        };

        Display.Children.Add(linea);

        _oldPoint = _currentPoint;


    }

    private void Display_PointerPressed(object sender, PointerRoutedEventArgs e)
    {

        _currentPoint = e.GetCurrentPoint(this).Position;
        _oldPoint = _currentPoint;


    }