FastColumnBitmapSeries strange artifact display

[Tom]

Hi, the FastColumnBitmapSeries displays horzontal lines beneath the columns which have value of zero. This creates the false illusion of there being columns with a small positive/negative value when there is none, especially when the chart is very small. How can these lines be removed?

Attached is an image showing the wrong (current display) and the correct version (how it should look like). Also attached is the sample app.

Thank you.

Attachment: sfChartFastColumn_8f041ea7.rar

[Muneesh Kumar G]

Hi Tom, 

 

Greetings from Syncfusion. We have analyzed your requirement and we would like to inform you that chart renders single pixel height column when segment value is zero. So, we have achieved your requirement by using custom FastColumnBitmapSeties and setting NaN value instead of zero in YValues in OnDataSourceChanged method as per the below code snippet.  

 

Code snippet [FastColumnBitmapSeriesExt.vb]: 

Public Class FastColumnBitmapSeriesExt 

    Inherits FastColumnBitmapSeries 

 

    Protected Overrides Sub OnDataSourceChanged(oldValue As IEnumerable, newValue As IEnumerable) 

 

        MyBase.OnDataSourceChanged(oldValue, newValue) 

 

        For number As Int32 = 0 To YValues.Count - 1 Step 1 

            If (YValues(number) = 0) Then 

                YValues(number) = Double.NaN 

            End If 

        Next 

 

    End Sub 

 

End Class 

 

Code snippet [MainWindow.vb] 

Class MainWindow 

 

    .. 

 

    Dim SeriesPrice As New FastSteplineBitmapSeriesExt 

    Dim SeriesVolumeBuy As New FastColumnBitmapSeriesExt 

    Dim SeriesVolumeSell As New FastColumnBitmapSeriesExt 

 

    Dim scrollBar As SfChartResizableBar 

    Dim zoomDays As Integer 

.. 

 

We have modified your sample based on this, please find the sample from the following location.  

 

Sample : http://www.syncfusion.com/downloads/support/forum/139092/ze/Sample137569261 

 

Hope this helps.  

 

Thanks, 

Muneesh Kumar G. 

 

[Tom]

This is great, thank you Muneesh.

[Muneesh Kumar G]

Hi Tom, 

Thanks for the update.

We are glad to know that the given solution works. Please let us know if you need any further assistance.

Thanks,
Muneesh Kumar G.