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ITimeSpanMeasureUnitsCalculator Interface

Interface that should be implemented by any class that can be used as a time-span measurement unit calculator.

Namespace: DevExpress.Xpf.Charts

Assembly: DevExpress.Xpf.Charts.v22.1.dll

Declaration

public interface ITimeSpanMeasureUnitsCalculator

The following members return ITimeSpanMeasureUnitsCalculator objects:

Remarks

The ITimeSpanMeasureUnitsCalculator interface provides the CalculateMeasureUnit method that allows computing a time-span measurement unit for the x-axis.

Example

The automatic time-span scale options allow you to create a measurement unit calculator to determine the current measurement unit if the predefined one does not fit your requirements. Create a class that implements the ITimeSpanMeasureUnitsCalculator interface and assign it to the AutomaticMeasureUnitsCalculator property to use a custom measurement units calculation algorithm:

<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:AutomaticTimeSpanScaleOptions AggregateFunction="Average">
                                <dxc:AutomaticTimeSpanScaleOptions.AutomaticMeasureUnitsCalculator>
                                    <local:CustomAutomaticTimeSpanMeasureUnitsCalculator/>
                                </dxc:AutomaticTimeSpanScaleOptions.AutomaticMeasureUnitsCalculator>
                            </dxc:AutomaticTimeSpanScaleOptions>
                        </dxc:AxisX2D.TimeSpanScaleOptions>
                    </dxc:AxisX2D>
                </dxc:XYDiagram2D.AxisX>
            </dxc:XYDiagram2D>
        </dxc:ChartControl>
    </Grid>
</Window>
See Also