CountSummaryFunction Class

The summary function that calculates the number of points.

Namespace: DevExpress.Xpf.Charts

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

Declaration

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:

Examples

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.
<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>

Inheritance

Object
DevExpress.Xpf.Charts.NotifyPropertyChangedObject
SummaryFunctionBase
CountSummaryFunction
See Also