[Nplot-devel] barplot not lining up

[dynamix . <dy...@li...>]

I created a barchart based on a few values and in my prog i have an option do change the timeframe. when i look at a short timeframe all is well but when i extend it there are a few items at almost regular intervals where the bottom of the bar is below the zero line.
my ordinate bottom data is all zeros or above so whats up with that ?
also how is it best to handle the width of the bars - as you display a larger amount of data the width needs to shrink.
This is what im doing at the moment : 

 Private Sub callVolume(ByVal igraph As Integer)

        Dim lpvolume As NPlot.BarPlot = New NPlot.BarPlot

        lpvolume.AbscissaData = datedata1
        lpvolume.OrdinateDataTop = volumedata1

        Dim zz, aa, bb As Integer
        bb = volumedata1.Item(0)
        For z = 0 To volumedata1.Count - 1
            zz = volumedata1.Item(z)
            If zz > aa Then
                aa = zz
            ElseIf zz < bb Then
                bb = zz ' get lowest value
            End If
        Next

        Dim zerodata As ArrayList = New ArrayList

        For Each item In datedata1
            zerodata.Add(bb)
        Next

        lpvolume.OrdinateDataBottom = zerodata
        lpvolume.BarWidth = (PlotSurface2D1.Width - 200) / datedata1.Count

        lpvolume.BorderColor = Color.Orange
        lpVolume.Label = "Volume"

        If igraph = 1 Then
            PlotSurface2D2.Add(lpVolume, PlotSurface2D.XAxisPosition.Bottom, PlotSurface2D.YAxisPosition.Right)
        ElseIf igraph = 2 Then
            PlotSurface2D3.Add(lpVolume, PlotSurface2D.XAxisPosition.Bottom, PlotSurface2D.YAxisPosition.Right)
        End If

    End Sub


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