[WPF] ChartSeriesDescriptor.TypeConverter in RadCartesianChart

[Valentin]

Hello Telerik,

I'm using a RadCartesianChart in WPF allowing a complete customization of the chart.

        <chart:RadCartesianChart x:Name="BarChart"   Visibility="{Binding VisibilityBars, Mode=OneTime}" Grid.ColumnSpan="2">
            <telerik:RadCartesianChart.SmartLabelsStrategy>
                <telerik:ChartSmartLabelsStrategy />
            </telerik:RadCartesianChart.SmartLabelsStrategy>

            <!--Series-->
            <telerik:RadCartesianChart.SeriesProvider>
                <telerik:ChartSeriesProvider Source="{Binding Series}"   >
                    <telerik:ChartSeriesDescriptor ItemsSourcePath="DisplayValues"  TypePath="ShapeType" >
                        <telerik:ChartSeriesDescriptor.TypeConverter>
                            <conv:ShapeTypeToSeriesTypeConverter ChartType="Bar"  />
                        </telerik:ChartSeriesDescriptor.TypeConverter>
                    </telerik:ChartSeriesDescriptor> 
                </telerik:ChartSeriesProvider>
            </telerik:RadCartesianChart.SeriesProvider>


            <!--Axes-->
            <chart:RadCartesianChart.HorizontalAxis>
                <chartView:CategoricalAxis x:Name="horizontalAxis"  
									      Title="{Binding HorizontalAxisTitle}"  
                                          />
            </chart:RadCartesianChart.HorizontalAxis>

            <chart:RadCartesianChart.VerticalAxis>
                <chartView:LinearAxis x:Name="verticalAxis" 
									      Title="{Binding VerticalAxisTitle}"  
                                          MajorStep="{Binding VerticalAxisMajorStep}" 
									      Minimum="{Binding VerticalAxisMinimum}" 
                                          Maximum="{Binding VerticalAxisMaximum}" 
									      HorizontalLocation="Left" />
            </chart:RadCartesianChart.VerticalAxis>

            <chart:RadCartesianChart.Grid>
                <chartView:CartesianChartGrid MajorLinesVisibility="XY" />
            </chart:RadCartesianChart.Grid>
        </chart:RadCartesianChart>

The chart allows the possibility to custom the series for the PointType and the PointShape. I'm using a ShapeTypeToSeriesTypeConverter class, as below:

Public Class ShapeTypeToSeriesTypeConverter
        Implements IValueConverter
        Public Property ChartType As String


        Public Function Convert(value As Object, targetType As Type, parameter As Object, culture As CultureInfo) As Object Implements IValueConverter.Convert

            If value Is Nothing OrElse TypeOf (value) IsNot ChartSerieModel.ShapeTypes Then
                Return Nothing
            End If

            Dim ShapeType As ChartSerieModel.ShapeTypes = CType(value, ChartSerieModel.ShapeTypes)
            Select Case ChartType
                Case "Radar"
                    Select Case ShapeType
                        Case ChartSerieModel.ShapeTypes.None
                            Return GetType(RadarPointSeries)

                        Case ChartSerieModel.ShapeTypes.Line, ChartSerieModel.ShapeTypes.DashedLine
                            Return GetType(RadarLineSeries)

                        Case ChartSerieModel.ShapeTypes.Area
                            Return GetType(RadarAreaSeries)

                        Case Else
                            Return Nothing
                    End Select
                Case "Scatter"
                    Select Case ShapeType
                        Case ChartSerieModel.ShapeTypes.None
                            Return GetType(ScatterPointSeries)

                        Case ChartSerieModel.ShapeTypes.Line, ChartSerieModel.ShapeTypes.DashedLine
                            Return GetType(ScatterLineSeries)

                        Case ChartSerieModel.ShapeTypes.Area
                            Return GetType(ScatterAreaSeries)
                        Case Else
                            Return Nothing
                    End Select

                Case Else
                    Select Case ShapeType
                        Case ChartSerieModel.ShapeTypes.None
                            Return GetType(PointSeries)

                        Case ChartSerieModel.ShapeTypes.Line, ChartSerieModel.ShapeTypes.DashedLine
                            Return GetType(StepLineSeries)

                        Case ChartSerieModel.ShapeTypes.Area
                            Return GetType(BarSeries)
                        Case Else
                            Return Nothing
                    End Select
            End Select
        End Function

        Public Function ConvertBack(value As Object, targetType As Type, parameter As Object, culture As CultureInfo) As Object Implements IValueConverter.ConvertBack
            Throw New NotImplementedException()
        End Function
    End Class

 

The problem is on the Else case (BarChart) when I select None shape. I tried with PointSeries and LineSeries because this is the result I want but as you can see in the attached file "none shape.png", the full green serie is hidden.

Excepected result:

• PointSeries: only the points should be visible, no link
• LineSeries: the points should be visible and they should be linked by a direct line

Do you know how can I link the points using a direct line (and not the like the StepLineSeries)?

Attached files (here):

• shape choice.png: example of shapes choice
• line shape.png: example when the Line shape is selected, and the green serie is correctly displayed
  

Many thanks.

Valentin M.

[Martin Ivanov]

All line series in the picture seem like StepLineSeries. Double check the code in the type converter and make sure that you are using LineSeries for these situations. If this doesn't help, I would suggest you to prepare a small sample showing your sample and data and attach it here.

[Valentin]

Hello Martin,

As you can see in the attached files, the light purple serie is a BarSeries (type=Area). In the two first screens, the green and the dark purple series are a StepLineSeries, but in the last screen the green serie is a PointSeries, and this is why it disappears.

Valentin M.

[Martin Ivanov]

Hey Valentin,

I am afraid that without recreating this behavior I cannot tell what exactly is happening. And I cannot recreate it without having the complete setup that adjusts the view and the view models. This said, would it be possible to send over a project showing the exact setup? This way I can test it and see what is going on.