The crosshairs aren't important, I need the hittest's XValue and YValue to make sense.

I've attached a screenshot of two charts, with the only difference between them
being one is of charttype 'Column' and the other of 'Bar'.

I've plotted som X Y values from the hittest.XValue and hittest.YValue functions, as you can see the xy values
on the bar chart doesn't make sense.

 Here's the code I used

 
  Private Sub XamChart1_MouseDown(ByVal sender As Object, ByVal e As System.Windows.Input.MouseEventArgs) Handles XamChart1.MouseDown

        Dim h As Infragistics.Windows.Chart.HitTestArgs = XamChart1.HitTest(e)
        Dim x As Double = e.MouseDevice.GetPosition(LayoutRoot).X - 5
        Dim y As Double = e.MouseDevice.GetPosition(LayoutRoot).Y - 10

        Dim lbl As New Label
        lbl.Content = "<- X:" & Math.Round(h.XValue, 2) & " - Y:" & Math.Round(h.YValue, 2)
        lbl.Margin = New Thickness(x, y, 0, 0)
        LayoutRoot.Children.Insert(0, lbl)

 
   End Sub
 
   Private Sub Bind()

        Dim ds As New System.Data.DataSet
        ds.ReadXml("C:\TestXMLBinding\TestXMLBinding\Data\ScatterplotData.xml")

        Dim axisX As New Infragistics.Windows.Chart.Axis
        axisX.AxisType = Infragistics.Windows.Chart.AxisType.PrimaryX
        axisX.Label.Format = "{0:n3}"
        Name = "X"
        XamChart1.Axes.Add(axisX)

        Dim axisY As New Infragistics.Windows.Chart.Axis
        axisY.AxisType = Infragistics.Windows.Chart.AxisType.PrimaryY
        axisY.Label.Format = "{0:n1}"
        Name = "Y"
        XamChart1.Axes.Add(axisY)


        Dim s As Infragistics.Windows.Chart.Series = New Infragistics.Windows.Chart.Series
        s.DataSource = ds.Tables(0)
        s.DataMapping = "label=x;value=y"
        s.ChartType = Infragistics.Windows.Chart.ChartType.Bar
        s.AxisX = "X"
        s.AxisY = "Y"

        XamChart1.Series.Add(s)

    End Sub
 
 
 

although the ordinal axes (X in column chart, Y in bar chart) are displaying "100, 120, etc," these are just labels; they do not represent a numeric value on the axis.  they could just as easily say "john, paul, george, and ringo."  so the values HitTest is returning are correct.  i think what you need to do is round to the nearest integer, then get the point back from your datasource using that value as an index.

if you want the X and Y axes to both represent a numeric scale, try using a Scatter or ScatterLine series.

David Negley"] i think what you need to do is round to the nearest integer, then get the point back from your datasource using that value as an index

I already know this and it works fine on column charts, please have a look at my bar chart (on the right) and give me and example
of how you would translate any of the X or Y values to an index.

<SERIES>
  <VALUE X="100" Y="0.1"/>
  <VALUE X="120" Y="0.2"/>
  <VALUE X="140" Y="0.3"/>
  <VALUE X="160" Y="0.4"/>
  <VALUE X="180" Y="0.5"/>
  <VALUE X="200" Y="0.6"/>
  <VALUE X="220" Y="0.7"/>
 </SERIES>

hi...is it possible to break the y axis as we do in excel so that I can display both small and high values clearly??

sorry, i see now why my last response wasn't too helpful. after some investigation i found that this is a bug in the control.  i entered as bug # BR34349.  it will be resolved in a future hotfix.

the problem is, the bar chart is configured backwards -- that is, the X axis is using ordinal calculations and so internally it seems to range from 0 to numberOfDataPoints + 1.  the Y axis ranges from 0 to maximumDataValue, but the maximum might be rounded up.