How to: Obtain Values Calculated for Automatic Axis Date-Time Scale Modes

• Nov 13, 2018
• 2 minutes to read

Use the ChartControl.AxisScaleChanged (WebChartControl.AxisScaleChanged) event to obtain the axis‘ automatically calculated grid alignment and measurement unit values, when the scale mode is automatic. Moreover the event arguments contains the axis itself. This event is raised when the scale mode, measure unit, grid alignment or grid spacing of the axis scale has been changed.

View Example

Form1.cs

private void Form1_Load(object sender, EventArgs e) {
    chartControl1.AxisScaleChanged += OnChartAxisScaleChanged;
}

private void OnChartAxisScaleChanged(object sender, AxisScaleChangedEventArgs e) {
    AxisX axisX = e.Axis as AxisX;
    if (axisX == null) return;
    // In this event, you can access the properties of the corresponding axis, and
    // obtain the automatically calculated value for the axis date-time grid alignment and measure unit.
    axisX.Title.Visibility = DefaultBoolean.True;
    axisX.Title.Text = String.Format(
        "The Axis Grid Alignment Unit is {0} \r\nThe Axis Measure Unit is {1}", 
        e.Axis.DateTimeScaleOptions.GridAlignment.ToString(),
        e.Axis.DateTimeScaleOptions.MeasureUnit.ToString()
    );
}

Form1.vb

Private Sub Form1_Load(ByVal sender As Object, ByVal e As EventArgs) Handles Me.Load
    AddHandler chartControl1.AxisScaleChanged, AddressOf OnChartAxisScaleChanged
End Sub

Private Sub OnChartAxisScaleChanged(ByVal sender As Object, ByVal e As AxisScaleChangedEventArgs)
    Dim axisX As AxisX = TryCast(e.Axis, AxisX)
    If axisX Is Nothing Then
        Return
    End If
    ' In this event, you can access the properties of the corresponding axis, and
    ' obtain the automatically calculated value for the axis date-time grid alignment and measure unit.
    axisX.Title.Visibility = DefaultBoolean.True
    axisX.Title.Text = String.Format("The Axis Grid Alignment Unit is {0} " & ControlChars.CrLf & "The Axis Measure Unit is {1}", e.Axis.DateTimeScaleOptions.GridAlignment.ToString(), e.Axis.DateTimeScaleOptions.MeasureUnit.ToString())
End Sub

The result is shown in the following image.