ChartHitInfo.AxisLabelItem Property

Gets an axis label item which is located under the test point.

Namespace: DevExpress.XtraCharts

Assembly: DevExpress.XtraCharts.v18.2.dll

Declaration

C#

public AxisLabelItemBase AxisLabelItem { get; }

VB.NET

Public ReadOnly Property AxisLabelItem As AxisLabelItemBase

Property Value

Type	Description
AxisLabelItemBase	An AxisLabelItem object which represents the axis label item located under the test point.

Remarks

Use the AxisLabelItem property to access the axis label item located under the test point if the ChartHitInfo.InChartTitle property returns true. Note that if the ChartHitInfo.InChartTitle is false, then the AxisLabelItem property returns null (Nothing in Visual Basic).

An axis label item is the specific instance of the AxisLabelItem class, obtained in the ChartControl.CustomDrawAxisLabel (or WebChartControl.CustomDrawAxisLabel) event handler.

For more information, refer to Axis Labels.

Example

Apart from the capability to customize the overall appearance of axis labels, you can obtain individual axis labels at runtime. Then, it’s possible to apply all the options available for axis labels to them, individually. For example, based on some criteria (e.g. an axis value threshold), you can apply different formatting to axis labels.

For this, the special ChartControl.CustomDrawAxisLabel event is introduced. Handle it to obtain axis labels.

Note

For the WebChartControl you should handle its WebChartControl.CustomDrawSeries event to implement this task.

The following code demonstrates one possible implementation of this capability.

C#

private void chartControl1_CustomDrawAxisLabel(object sender, CustomDrawAxisLabelEventArgs e) {
    AxisBase axis = e.Item.Axis;
    if (axis is AxisY || axis is AxisY3D || axis is RadarAxisY) {
        double axisValue = (double)e.Item.AxisValue;
        if (axisValue < 0) {
            e.Item.TextColor = Color.Red;
        }
        else if (axisValue > 0) {
            e.Item.Text = "+" + e.Item.Text;
            e.Item.TextColor = Color.Green;
        }
        else if (axisValue == 0) {
            e.Item.Text = "Zero";
        }
    }
}

VB.NET

Private Sub chartControl1_CustomDrawAxisLabel(sender As Object, e As CustomDrawAxisLabelEventArgs)
   Dim axis As AxisBase = e.Item.Axis
   If TypeOf axis Is AxisY Or TypeOf axis Is AxisY3D Or TypeOf axis Is RadarAxisY Then
      Dim axisValue As Double = CDbl(e.Item.AxisValue)
      If axisValue < 0 Then
         e.Item.TextColor = Color.Red
      Else
         If axisValue > 0 Then
            e.Item.Text = "+" + e.Item.Text
            e.Item.TextColor = Color.Green
         Else
            If axisValue = 0 Then
               e.Item.Text = "Zero"
            End If
         End If
      End If
   End If
End Sub