ManualNumericScaleOptions.AggregateFunction Property

Gets or sets the function that is used to aggregate numeric axis data when one of the AxisX2D.NumericScaleOptions, AxisX3D.NumericScaleOptions, or CircularAxisX2D.NumericScaleOptions properties is set to ManualNumericScaleOptions.

Namespace: DevExpress.Xpf.Charts

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

Declaration

public AggregateFunction AggregateFunction { get; set; }
Public Property AggregateFunction As AggregateFunction

Property Value

Type Description
AggregateFunction

An AggregateFunction enumeration value.

Remarks

The image below shows numeric data aggregation in the Manual scale mode using the default Average function.

AutomaticNumeric_AverageFunction

NOTE

The AggregateFunction property is set to AggregateFunction.Average by default.

To disable numeric data aggregation, set the AggregateFunction property to AggregateFunction.None.

To learn more, see Data Aggregation.

Examples

This example demonstrates how to use the manual numeric scale options of the X-axis.

When the AxisX2D.NumericScaleOptions property is set to ManualNumericScaleOptions, you can manually define the ManualNumericScaleOptions.GridAlignment, ManualNumericScaleOptions.MeasureUnit and ManualNumericScaleOptions.AggregateFunction properties.

To use the automatic numeric scale options, set the AxisX2D.NumericScaleOptions property to AutomaticNumericScaleOptions and choose the appropriate AutomaticNumericScaleOptions.AggregateFunction.

To prevent the axis scale from being divided into intervals (and thus prevent chart data from being aggregated), set the ManualNumericScaleOptions.AggregateFunction or AutomaticNumericScaleOptions.AggregateFunction property to None.

<Window
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        xmlns:dxc="http://schemas.devexpress.com/winfx/2008/xaml/charts" 
    x:Class="AggregationNumericData.MainWindow"
        Title="MainWindow" Height="350" Width="525">
    <Grid>
        <dxc:ChartControl >
            <dxc:ChartControl.Legend>
                <dxc:Legend/>
            </dxc:ChartControl.Legend>
            <dxc:XYDiagram2D>
                <dxc:XYDiagram2D.AxisX>
                    <dxc:AxisX2D GridLinesVisible="True">
                        <dxc:AxisX2D.NumericScaleOptions>
                            <dxc:ManualNumericScaleOptions MeasureUnit="100" GridAlignment="1000" 
                                                           AggregateFunction="Maximum" GridSpacing="2"/>
                        </dxc:AxisX2D.NumericScaleOptions>
                    </dxc:AxisX2D>
                </dxc:XYDiagram2D.AxisX>
                <dxc:LineSeries2D DataSource="{Binding Path=Series}" 
                                  ArgumentDataMember="Argument" ValueDataMember="Value"/>
            </dxc:XYDiagram2D>
        </dxc:ChartControl>
    </Grid>
</Window>
See Also