Beginner Needs Help with RadChart

[Ted]

Below is code to add four identical charts to a wrappanel.

What code should be added to the function 'CreateCommodityCharts' to:

1. Change the charts to Pie charts.
2. Add Legends for the Companies.

Thank you.

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Namespace Views

 

    Public Class CommodityChartViewModel

 

        Private _data As IEnumerable(Of Company)

        Private _wrappanel As WrapPanel

 

        Public ReadOnly Property ChartWrapPanel As WrapPanel

            Get

                If Me._wrappanel Is Nothing Then

                    Me._wrappanel = CreateCommodityCharts

                End If

                Return Me._wrappanel

            End Get

        End Property

 

        Private Function CreateCommodityCharts() As WrapPanel

            ' Instantiate a new WrapPanel and set properties

            Dim myWrapPanel As New WrapPanel()

            myWrapPanel.Orientation = Orientation.Horizontal

            myWrapPanel.Width = 900

            myWrapPanel.HorizontalAlignment = Windows.HorizontalAlignment.Left

            myWrapPanel.VerticalAlignment = Windows.VerticalAlignment.Top

 

             

            ' Add the Telerik charts to the parent WrapPanel using the Children.Add method.

            For cntr = 1 To 4

                Dim pc As New Telerik.Windows.Controls.RadChart

                pc.Height = 300

                pc.Width = 300

                pc.ItemsSource = Data

                pc.DefaultView.ChartTitle.Content = "RAD Pie Chart " & cntr.ToString

                myWrapPanel.Children.Add(pc)

            Next

 

 

            ' Add the WrapPanel to the Page as Content

            Return myWrapPanel

        End Function

 

        Private ReadOnly Property Data() As IEnumerable(Of Company)

            Get

                If Me._data Is Nothing Then

                    Me._data = CreateCompanyData()

                End If

                Return Me._data

            End Get

        End Property

 

 

        Function CreateCompanyData() As IEnumerable(Of Company)

            Dim companyData As New List(Of Company)(2)

            companyData.Add(New Company("Nokia", 90))

            companyData.Add(New Company("RIM", 10))

            'companyData.Add(New Company("Other", 14))

            'companyData.Add(New Company("Apple", 13))

            'companyData.Add(New Company("HTC", 6))

            'companyData.Add(New Company("Fujitsu", 3))

 

            Return companyData

        End Function

 

        Public Class Company

            Public Sub New(name As String, share As Double)

                Me._name = name

                Me._share = share

            End Sub

 

            Private _name As String

            Private _share As Double

 

            Public Property Name() As String

                Get

                    Return Me._name

                End Get

                Set(value As String)

                    If Me._name <> value Then

                        Me._name = value

                    End If

                End Set

            End Property

 

            Public Property Share() As Double

                Get

                    Return Me._share

                End Get

                Set(value As Double)

                    If Me._share <> value Then

                        Me._share = value

                    End If

                End Set

            End Property

        End Class

    End Class

End Namespace

[Peshito]

Hi Ted,

In order to be able to change a chart to a Pie chart type you need to simply set its series type. You can achieve that by using series mappings like this for example:

Dim seriesMapping As New SeriesMapping()
seriesMapping.SeriesDefinition = New PieSeriesDefinition()

Using series mappings you can control how the data is bound to the chart. Setting the ItemMappings then will give you the possibility to bind each property that takes part in the chart:

Dim itemMapping As New ItemMapping()
itemMapping.DataPointMember = DataPointMember.YValue
itemMapping.FieldName = "Share"
seriesMapping.ItemMappings.Add(itemMapping)
itemMapping = New ItemMapping()
itemMapping.DataPointMember = DataPointMember.LegendLabel
itemMapping.FieldName = "Name"
seriesMapping.ItemMappings.Add(itemMapping)

and then add this series mapping to your chart's SeriesMappings collection:

Me.radChart.SeriesMappings.Add(seriesMapping)

Using LegentLabel as DataPointMember will fill the legend with your Name field value.

You can find more information about legend items and series mappings here:
http://www.telerik.com/help/silverlight/radchart-features-chart-legend.html
http://www.telerik.com/help/silverlight/radchart-populating-with-data-data-binding-with-manual-series-mapping.html

Regards,
Peshito
the Telerik team