CountSummaryFunction Class

The summary function that calculates the number of points.

Assembly : DevExpress.Xpf.Charts.v25.2.dll

NuGet Package : DevExpress.Wpf.Charts

Declaration

C#
VB.NET

csharp

public class CountSummaryFunction :
    SummaryFunctionBase

Public Class CountSummaryFunction
    Inherits SummaryFunctionBase

Remarks

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

Then assign a CountSummaryFunction object to the Summary.Function property.

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 CountSummaryFunction , the Chart Control provides the following summary functions:

Example

The example demonstrates how to apply CountSummaryFunction 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.
`CountSummaryFunction`	The summary function that calculates the number of points.

XAML
C#
VB.NET

xaml

<Window.DataContext>
    <local:ChartViewModel/>
</Window.DataContext>
<Grid>
    <dxc:ChartControl Width="540" Height="315">
        <dxc:XYDiagram2D>
            <dxc:PointSeries2D DataSource="{Binding Data}"
                               ArgumentDataMember="Argument"
                               ValueDataMember="Value">
                <!-- Configure the summary function options. -->
                <dxc:PointSeries2D.Summary>
                    <dxc:Summary>
                        <dxc:Summary.Function>
                            <dxc:CountSummaryFunction/>
                        </dxc:Summary.Function>
                    </dxc:Summary>
                </dxc:PointSeries2D.Summary>
                <!--...-->
            </dxc:PointSeries2D>
            <dxc:XYDiagram2D.AxisY>
                <dxc:AxisY2D Interlaced="False">
                    <dxc:AxisY2D.NumericScaleOptions>
                        <dxc:ContinuousNumericScaleOptions GridSpacing="1" AutoGrid="False"/>
                    </dxc:AxisY2D.NumericScaleOptions>
                    <dxc:AxisY2D.WholeRange>
                        <dxc:Range dxc:AxisY2D.AlwaysShowZeroLevel="False"/>
                    </dxc:AxisY2D.WholeRange>
                </dxc:AxisY2D>
            </dxc:XYDiagram2D.AxisY>
        </dxc:XYDiagram2D>
    </dxc:ChartControl>
</Grid>

csharp

public class ChartViewModel {
    public IEnumerable<DataPoint> Data { get; private set; }
    public ChartViewModel() {
        Data = new Collection<DataPoint> {
            new DataPoint { Argument= 1, Value = 853D},
            new DataPoint { Argument= 1, Value = 321D},
            new DataPoint { Argument= 2, Value = 655D},
            new DataPoint { Argument= 2, Value = 1325D},
            new DataPoint { Argument= 2, Value = 255D},
            new DataPoint { Argument= 2, Value = 981D},
            new DataPoint { Argument= 3, Value = 963D},
            new DataPoint { Argument= 3, Value = 123D},
            new DataPoint { Argument= 3, Value = 1011D},
            new DataPoint { Argument= 5, Value = 1356D},
            new DataPoint { Argument= 5, Value = 232D},
            new DataPoint { Argument= 5, Value = 1323D},
            new DataPoint { Argument= 5, Value = 1125D},
            new DataPoint { Argument= 6, Value = 865D},
            new DataPoint { Argument= 6, Value = 865D},
            new DataPoint { Argument= 10, Value = 1006D},
            new DataPoint { Argument= 10, Value = 236D},
            new DataPoint { Argument= 16, Value = 1090D},
            new DataPoint { Argument= 18, Value = 496D},
            new DataPoint { Argument= 18, Value = 691D},
            new DataPoint { Argument= 20, Value = 1125D},
            new DataPoint { Argument= 20, Value = 600D},
            new DataPoint { Argument= 20, Value = 770D}
        };
    }
}
public class DataPoint {
    public double Argument { get; set; }
    public double Value { get; set; }
}

Public Class ChartViewModel
    Public Property Data As IEnumerable(Of DataPoint)

    Public Sub New()
        Data = New Collection(Of DataPoint) From {
            New DataPoint With { .Argument = 1, .Value = 853R },
            New DataPoint With { .Argument = 1, .Value = 321R },
            New DataPoint With { .Argument = 2, .Value = 655R },
            New DataPoint With { .Argument = 2, .Value = 1325R },
            New DataPoint With { .Argument = 2, .Value = 255R },
            New DataPoint With { .Argument = 2, .Value = 981R },
            New DataPoint With { .Argument = 3, .Value = 963R },
            New DataPoint With { .Argument = 3, .Value = 123R },
            New DataPoint With { .Argument = 3, .Value = 1011R },
            New DataPoint With { .Argument = 5, .Value = 1356R },
            New DataPoint With { .Argument = 5, .Value = 232R },
            New DataPoint With { .Argument = 5, .Value = 1323R },
            New DataPoint With { .Argument = 5, .Value = 1125R },
            New DataPoint With { .Argument = 6, .Value = 865R },
            New DataPoint With { .Argument = 6, .Value = 865R },
            New DataPoint With { .Argument = 10, .Value = 1006R },
            New DataPoint With { .Argument = 10, .Value = 236R },
            New DataPoint With { .Argument = 16, .Value = 1090R },
            New DataPoint With { .Argument = 18, .Value = 496R },
            New DataPoint With { .Argument = 18, .Value = 691R },
            New DataPoint With { .Argument = 20, .Value = 1125R },
            New DataPoint With { .Argument = 20, .Value = 600R },
            New DataPoint With { .Argument = 20, .Value = 770R
            }
        }
    End Sub
End Class

Public Class DataPoint
    Public Property Argument As Double
    Public Property Value As Double
End Class

Inheritance

Object DevExpress.Xpf.Charts.NotifyPropertyChangedObject SummaryFunctionBase CountSummaryFunction