Infragistics Forums

Is there a bug with ...LineChart.NullHandling = NullHandling.DontPlot ?

I am adding NumericSeries into a MRUltraChart Class inherited from Ultrachart. Somehow, some of the icons in the lineChart are not displaying although I have ensured that all data are displayed in the NumericSeries. I am adding all data into each NumericSeries and using the

NS1.Points.Add(New NumericDataPoint(ChlaValue, AMTD, True)) OR  NS1.Points.Add(New NumericDataPoint(ChlaValue, AMTD, False)) to display empty/null values or not. In my MRUltraChart I have set Me.LineChart.NullHandling = NullHandling.DontPlot to hide datapoints (i.e. icons) I do not wish to display.

Somehow, for example out of 11 data in the NumericSeries (NS1) I have 8 data points that need to be shown (i.e. NS1.Points.Add(New NumericDataPoint(ChlaValue, AMTD, False)) ) and the rest set to NS1.Points.Add(New NumericDataPoint(ChlaValue, AMTD, True)) to show as null value. When displaying my Chart however, only 7 points are shown.

P.S. To make sure I have not missed a data points, I have loop through all data points in the NumericSeries NS1 and shown correct null values and "Empty" fields.

How to get this bug fixed?

Public Class MRultrachart

Inherits Infragistics.Win.UltraWinChart.UltraChart

Public Sub New(ByVal width As Integer, ByVal height As Integer)

Me.Size = New Drawing.Size(width, height)

Me.BorderStyle = Windows.Forms.BorderStyle.None

Me.Border.Thickness = 0

Me.LineChart.NullHandling = NullHandling.DontPlot 'null points won't be displayed

With AxisDim axisMargn As New Infragistics.UltraChart.Resources.Appearance.AxisMargin

axisMargn.MarginType = Infragistics.UltraChart.Shared.Styles.LocationType.Pixels

axisMargn.Value = 4

.X.Margin.Far = axisMargn

.X.Margin.Near = axisMargn

.Y.Margin.Far = axisMargn

.Y.Margin.Near = axisMargn

.Y.TickmarkStyle = Infragistics.UltraChart.Shared.Styles.AxisTickStyle.Smart

.X.Labels.Orientation = Infragistics.UltraChart.Shared.Styles.TextOrientation.Horizontal

.Y.Labels.Orientation = Infragistics.UltraChart.Shared.Styles.TextOrientation.Horizontal

.X.Extent = 3

.Y.Extent = 12

.X.LineThickness = 1

.Y.LineThickness = 1

.X.MajorGridLines.Visible = False

.Y.MajorGridLines.Visible = False

.X.Labels.Font = New Font("Arial", 7, FontStyle.Regular, GraphicsUnit.Point) .Y.Labels.Font = New Font("Arial", 7, FontStyle.Regular, GraphicsUnit.Point)

.Y.Labels.ItemFormatString = "<DATA_VALUE:0.#>" 'somehow not working; -> so have to set onPrintDocument procedure

End With

End Sub

End Class

I found this link and I think that's why I have missing data on the chart

http://forums.labs.infragistics.com/forums/p/4433/22249.aspx

But it still doesnt work for me! Is this nullHandling issue fixed in 2008 version?

 there are no bugs that i know of related to null handling / empty point rendering. 

 i don't really understand the problem as you've described it... maybe you can post an image of your chart?

for example, in a chart where a data point is between 2 null values, the data point just doesn't display. i might have to change chart type~

no, that hasn't changed.  a line requires two consecutive points to display.  however, the LineChart.LineAppearances property will allow you to add icons atop each point in the line, so your isolated points will display.

 

also, if you set NullHandling = InterpolateSimple and use the Data.EmptyStyle properties to configure a style for displaying null points, you should see a line going through that isolated point as well.