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ManualTimeSpanScaleOptions.AggregateFunction Property

Gets or sets the function that is used to aggregate time-span data associated with the axis.

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 aggregate function applied to data.

Remarks

The Chart Control can use an aggregate function to group raw data source values and show aggregates as series points. When the AggregateFunction property is not specified, the Chart uses the Average function. For more information, see the Aggregation help topic.

The following images show how changes to the aggregate function and measure unit affect the representation of minute-by-minute chart data.

MeasureUnit = "Minute"; AggregateFunction = "None":

MeasureUnit = "Hour"; AggregateFunction = "None":

MeasureUnit = "Hour"; AggregateFunction = "Average":

Examples

The following example shows how to group minute-by-minute data into data points with a greater measurement unit ("Hour").

<Window
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
        xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
        xmlns:local="clr-namespace:TimeSpanExample"
        xmlns:dxc="http://schemas.devexpress.com/winfx/2008/xaml/charts" 
        x:Class="TimeSpanExample.MainWindow"
        mc:Ignorable="d"
        Title="MainWindow" Height="450" Width="800">
    <Window.DataContext>
        <local:ChartViewModel/>
    </Window.DataContext>
    <Grid>
        <dxc:ChartControl>
            <dxc:XYDiagram2D>
                <dxc:XYDiagram2D.AxisX>
                    <dxc:AxisX2D>
                        <dxc:AxisX2D.TimeSpanScaleOptions>
                            <dxc:ManualTimeSpanScaleOptions GridAlignment="Hour" 
                                                            GridSpacing="4"
                                                            MeasureUnit="Hour"
                                                            AggregateFunction="Average"
                                                            GridOffset="2"
                                                            AutoGrid="False"/>
                        </dxc:AxisX2D.TimeSpanScaleOptions>                           
                    </dxc:AxisX2D>
                </dxc:XYDiagram2D.AxisX>
                <!-- Other diagram settings. -->
            </dxc:XYDiagram2D>
        </dxc:ChartControl>
    </Grid>
</Window>
See Also