Android Question Canvas.DrawText Positioning issue/formula

Sub SetlabelText(v As Label, TFace As Typeface, txt As String)
    SetPadding(v, 0, 0, 0, 0) ' we set the padding
   
    Private vHeight As Int = v.Height ' the view's Height
    Private vWidth As Int = v.Width ' the view's Width
    Private tBase As Int ' the Text Base value
   
    If vHeight > vWidth Then 'if it's taller than it is wide
        tBase = vWidth ' the text size is calculated relatively to the view's Width
    Else 'if it's wider than it is tall
        tBase = vHeight ' the text size is calculated relatively to the view's Height
    End If
   
    'Now we get the max FontSize possible for tBase
    Private CV As Canvas
    CV.Initialize(v)
    Private x As Int = 0
    Do Until CV.MeasureStringHeight("+", TFace, x)>= tBase
        x=x+1
    Loop
   
    ' I want it to be about 70% of tBase
    x = Floor(x * 0.7)
   
    'Now I get the final sizes for text height with the calculated font size
    Private tHeight As Int = CV.MeasureStringHeight(txt, TFace, x)

    'and try to calculate the vertical origin point (x?) for the string
    Private yBase As Int = Floor (vHeight - ((vHeight-tHeight)/2)) ' wich clearly eludes me!!!!
    Private xBase As Int = Floor(vWidth/2)'this is horizontal origin point, center!

    CV.DrawText(txt,xBase, yBase, TFace, x, Colors.Black, "CENTER")     
End Sub