AverageSummaryFunction Class

The summary function that calculates the average of data point values.

Assembly: DevExpress.Xpf.Charts.v20.1.dll

NuGet Packages: DevExpress.WindowsDesktop.Wpf.Charts, DevExpress.Wpf.Charts

Declaration

C#
VB.NET

public class AverageSummaryFunction :
    SumSummaryFunction

Public Class AverageSummaryFunction
    Inherits SumSummaryFunction

Remarks

Assign a Summary object to the Series.Summary property to summarize data point values.

Then assign an AverageSummaryFunction object to the Summary.Function property.

Specify the ValueDataMember property to define a data source field that provides data to be aggregated.

For numerical and date-time x-axis scales, the function aggregates data point values for each interval specified by the MeasureUnit (NumericSummaryOptions.MeasureUnit or DateTimeSummaryOptions.MeasureUnit) property.

In addition to the AverageSummaryFunction, the Chart Control provides the following summary functions:

Example

The example demonstrates how to apply AverageSummaryFunction to aggregate data points.

Use the following API members to configure the summary function options:

Member	Description
Series.Summary	Gets or sets the series data point summarization settings.
Summary	Stores the series data point summarize options.
Summary.Function	Specifies the summary function that calculates data point values.
`AverageSummaryFunction`	The summary function that calculates the average of data point values.
DataMemberSummaryFunction.ValueDataMember	Gets or sets the data source field that provides data to be aggregated.

<Window.DataContext>
    <local:ChartViewModel/>
</Window.DataContext>
<Grid>
    <dxc:ChartControl>
        <dxc:XYDiagram2D SeriesItemsSource="{Binding SaleSeries}">
            <dxc:XYDiagram2D.SeriesItemTemplate>
                <DataTemplate>
                    <dxc:PointSeries2D DataSource="{Binding Values}"
                                       ArgumentDataMember="Category"
                                       ValueDataMember="Value">
                        <!-- Configure the summary function options. -->
                        <dxc:PointSeries2D.Summary>
                            <dxc:Summary>
                                <dxc:Summary.Function>
                                    <dxc:AverageSummaryFunction ValueDataMember="Value"/>
                                </dxc:Summary.Function>
                            </dxc:Summary>
                        </dxc:PointSeries2D.Summary>
                        <!--...-->
                        <dxc:PointSeries2D.Label>
                            <dxc:SeriesLabel Visible="True" TextPattern="Average: ${V}M" 
                                             dxc:MarkerSeries2D.Angle="90" ResolveOverlappingMode="JustifyAroundPoint"/>
                        </dxc:PointSeries2D.Label>
                    </dxc:PointSeries2D>
                </DataTemplate>
            </dxc:XYDiagram2D.SeriesItemTemplate>
            <dxc:XYDiagram2D.AxisX>
                <dxc:AxisX2D TickmarksMinorVisible="False"/>
            </dxc:XYDiagram2D.AxisX>
            <dxc:XYDiagram2D.AxisY>
                <dxc:AxisY2D Interlaced="False">
                    <dxc:AxisY2D.WholeRange>
                        <dxc:Range dxc:AxisY2D.AlwaysShowZeroLevel="False"/>
                    </dxc:AxisY2D.WholeRange>
                    <dxc:AxisY2D.Label>
                        <dxc:AxisLabel TextPattern="${V}M"/>
                    </dxc:AxisY2D.Label>
                </dxc:AxisY2D>
            </dxc:XYDiagram2D.AxisY>
        </dxc:XYDiagram2D>
        <dxc:ChartControl.Titles>
            <dxc:Title Content="Product Sales" HorizontalAlignment="Center" FontSize="14"/>
        </dxc:ChartControl.Titles>
    </dxc:ChartControl>
</Grid>

public class ChartViewModel {
    public IEnumerable<SaleSeries> SaleSeries { get; private set; }
    public ChartViewModel() {     
        SaleSeries = new Collection<SaleSeries> {
        new SaleSeries {
            Values = new Collection<SaleInfo> {
                new SaleInfo { Category= "Video players", Region = "Asia",          Value = 853},
                new SaleInfo { Category= "Video players", Region = "Australia",     Value = 321},
                new SaleInfo { Category= "Video players", Region = "Europe",        Value = 655},
                new SaleInfo { Category= "Video players", Region = "North America", Value = 1325},
                new SaleInfo { Category= "Video players", Region = "South America", Value = 653},

                new SaleInfo { Category= "Automation", Region = "Asia",          Value = 172},
                new SaleInfo { Category= "Automation", Region = "Australia",     Value = 255},
                new SaleInfo { Category= "Automation", Region = "Europe",        Value = 981D},
                new SaleInfo { Category= "Automation", Region = "North America", Value = 963D},
                new SaleInfo { Category= "Automation", Region = "South America", Value = 123D},

                new SaleInfo { Category= "Monitors", Region = "Asia",          Value = 1011D},
                new SaleInfo { Category= "Monitors", Region = "Australia",     Value = 359D},
                new SaleInfo { Category= "Monitors", Region = "Europe",        Value = 721D},
                new SaleInfo { Category= "Monitors", Region = "North America", Value = 565D},
                new SaleInfo { Category= "Monitors", Region = "South America", Value = 532D},

                new SaleInfo { Category= "Projectors", Region = "Asia",          Value = 998D},
                new SaleInfo { Category= "Projectors", Region = "Australia",     Value = 222D},
                new SaleInfo { Category= "Projectors", Region = "Europe",        Value = 865D},
                new SaleInfo { Category= "Projectors", Region = "North America", Value = 787D},
                new SaleInfo { Category= "Projectors", Region = "South America", Value = 332D},

                new SaleInfo { Category= "Televisions", Region = "Asia",          Value = 1356D},
                new SaleInfo { Category= "Televisions", Region = "Australia",     Value = 232D},
                new SaleInfo { Category= "Televisions", Region = "Europe",        Value = 1323D},
                new SaleInfo { Category= "Televisions", Region = "North America", Value = 1125D},
                new SaleInfo { Category= "Televisions", Region = "South America", Value = 865D}
            }
        }
    };
    }
}
public class SaleSeries {
    public IEnumerable<SaleInfo> Values { get; set; }
}
public class SaleInfo {
    public string Category { get; set; }
    public string Region { get; set; }
    public double Value { get; set; }
}

Public Class ChartViewModel
    Public Property SaleSeries As IEnumerable(Of SaleSeries)

    Public Sub New()
        SaleSeries = New Collection(Of SaleSeries) From {
            New SaleSeries With {
                .Values = New Collection(Of SaleInfo) From {
                    New SaleInfo With { .Category = "Video players", .Region = "Asia", .Value = 853R },
                    New SaleInfo With { .Category = "Video players", .Region = "Australia", .Value = 321R },
                    New SaleInfo With { .Category = "Video players", .Region = "Europe", .Value = 655R },
                    New SaleInfo With { .Category = "Video players", .Region = "North America", .Value = 1325R },
                    New SaleInfo With { .Category = "Video players", .Region = "South America", .Value = 653R },
                    New SaleInfo With { .Category = "Automation", .Region = "Asia", .Value = 172R },
                    New SaleInfo With { .Category = "Automation", .Region = "Australia", .Value = 255R },
                    New SaleInfo With { .Category = "Automation", .Region = "Europe", .Value = 981R },
                    New SaleInfo With { .Category = "Automation", .Region = "North America", .Value = 963R },
                    New SaleInfo With { .Category = "Automation", .Region = "South America", .Value = 123R },
                    New SaleInfo With { .Category = "Monitors", .Region = "Asia", .Value = 1011R },
                    New SaleInfo With { .Category = "Monitors", .Region = "Australia", .Value = 359R },
                    New SaleInfo With { .Category = "Monitors", .Region = "Europe", .Value = 721R },
                    New SaleInfo With { .Category = "Monitors", .Region = "North America", .Value = 565R },
                    New SaleInfo With { .Category = "Monitors", .Region = "South America", .Value = 532R },
                    New SaleInfo With { .Category = "Projectors", .Region = "Asia", .Value = 998R },
                    New SaleInfo With { .Category = "Projectors", .Region = "Australia", .Value = 222R },
                    New SaleInfo With { .Category = "Projectors", .Region = "Europe", .Value = 865R },
                    New SaleInfo With { .Category = "Projectors", .Region = "North America", .Value = 787R },
                    New SaleInfo With { .Category = "Projectors", .Region = "South America", .Value = 332R },
                    New SaleInfo With { .Category = "Televisions", .Region = "Asia", .Value = 1356R },
                    New SaleInfo With { .Category = "Televisions", .Region = "Australia", .Value = 232R },
                    New SaleInfo With { .Category = "Televisions", .Region = "Europe", .Value = 1323R },
                    New SaleInfo With { .Category = "Televisions", .Region = "North America", .Value = 1125R },
                    New SaleInfo With { .Category = "Televisions", .Region = "South America", .Value = 865R }
                }
            }
        }
    End Sub
End Class

Public Class SaleSeries
    Public Property Values As IEnumerable(Of SaleInfo)
End Class

Public Class SaleInfo
    Public Property Category As String
    Public Property Region As String
    Public Property Value As Double
End Class