Postion and AlignmentPoint

if (text.HorizontalMode == TextHorizontalMode.TextLeft &&       text.VerticalMode == TextVerticalMode.TextBase)
{
    // use Position
}
else
{
    // use AlignmentPoint
}

if (text.Justify == AttachmentPoint.BaseLeft)
{
    // use Position
}
else
{
    // use AlignmentPoint
}