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AxisLabel.Formatter Property

Gets or sets an object that formats axis labels.

Namespace: DevExpress.Xpf.Charts

Assembly: DevExpress.Xpf.Charts.v25.1.dll

NuGet Package: DevExpress.Wpf.Charts

Declaration

[Browsable(false)]
public IAxisLabelFormatter Formatter { get; set; }

Property Value

Type Description
IAxisLabelFormatter

An object of a class that implements the IAxisLabelFormatter interface.

Remarks

Use the Formatter property if you need to generate text strings for axis labels based on a custom condition or change an order of magnitude of axis label values.

Formatter has higher priority than the AxisLabel.TextPattern property value. For this reason, the AxisLabel.TextPattern value is ignored if Formatter is specified.

Example

Perform the steps below to create a formatter:

  • Create a class that implements the IAxisLabelFormatter interface and uses the interface’s GetAxisLabelText method.
  • Assign the newly created class’s instance to the AxisLabel.Formatter property.

How to: Format Numeric Axis Labels

This example applies a custom format to the numeric axis’s labels.

Markup:

<dxc:XYDiagram2D.AxisX>
    <dxc:AxisX2D>
        <dxc:AxisX2D.Label>
            <dxc:AxisLabel>
                <dxc:AxisLabel.Formatter>
                    <local:AxisLabelFormatter/>
                </dxc:AxisLabel.Formatter>
            </dxc:AxisLabel>
        </dxc:AxisX2D.Label>
    </dxc:AxisX2D>
</dxc:XYDiagram2D.AxisX>
<dxc:XYDiagram2D.AxisY>
    <dxc:AxisY2D>
            <dxc:AxisLabel>
                <dxc:AxisLabel.Formatter>
                    <local:AxisLabelFormatter/>
                </dxc:AxisLabel.Formatter>
            </dxc:AxisLabel>
        </dxc:AxisY2D.Label>
    </dxc:AxisY2D>
</dxc:XYDiagram2D.AxisY>

Code-Behind:

public class AxisLabelFormatter : IAxisLabelFormatter {
    public string GetAxisLabelText(object axisValue) {
        return Convert.ToString((double)axisValue / 1000);
    }
}

How to: Format Date-Time Axis Labels

This example formats date-time axis labels as follows:

Markup:

<dxc:XYDiagram2D.AxisX>
    <dxc:AxisX2D>
        <dxc:AxisX2D.DateTimeScaleOptions>
            <dxc:ManualDateTimeScaleOptions AutoGrid="False" 
                                            GridAlignment="Day" 
                                            GridSpacing="7"/>
        </dxc:AxisX2D.DateTimeScaleOptions>
        <dxc:AxisX2D.Label>
            <dxc:AxisLabel>
                <dxc:Axis2D.ResolveOverlappingOptions>
                    <dxc:AxisLabelResolveOverlappingOptions AllowHide="False"/>
                </dxc:Axis2D.ResolveOverlappingOptions>
                <dxc:AxisLabel.Formatter>
                    <local:AxisLabelFormatter/>
                </dxc:AxisLabel.Formatter>
            </dxc:AxisLabel>
        </dxc:AxisX2D.Label>
    </dxc:AxisX2D>
</dxc:XYDiagram2D.AxisX>

Code-Behind:

public class AxisLabelFormatter : IAxisLabelFormatter {
    public string GetAxisLabelText(object axisValue) {
        DateTime value = (DateTime)axisValue;
        return ((value.Day >= 1) && (value.Day <= 7)) ? $"{value.ToString("MMM, d")}" : $"{value.Day}";
    }
}
See Also