ChartControl.ConstantLineMoved Event

Occurs when a user moves a constant line.

Namespace: DevExpress.XtraCharts

Assembly: DevExpress.XtraCharts.v20.2.UI.dll

NuGet Package: DevExpress.Win.Charts

Declaration

C#

public event ConstantLineMovedEventHandler ConstantLineMoved

VB.NET

Public Event ConstantLineMoved As ConstantLineMovedEventHandler

Event Data

The ConstantLineMoved event's data class is ConstantLineMovedEventArgs. The following properties provide information specific to this event:

Property	Description
ConstantLine	Returns a constant line that is being moved.
OldValue	Returns the previous axis value.

Remarks

Users can move constant lines if their RuntimeMoving option is enabled.

Example

The following example adds a horizontal constant line with an editable title. Once a user moves a constant line, the title is updated to display the current constant line value.

C#

private void OnFormLoad(object sender, EventArgs e) {

    ConstantLine constantLine = new ConstantLine();
    constantLine.AxisValue = 65.0;
    constantLine.Title.Text = "Title";    
    constantLine.RuntimeTitleEditing = true;
    constantLine.RuntimeMoving = true;

    XYDiagram diagram = chartControl1.Diagram as XYDiagram;
    diagram.AxisY.ConstantLines.Add(constantLine);

    chartControl1.ConstantLineMoved += OnChartControlConstantLineMoved;
}

private void OnChartControlConstantLineMoved(object sender, ConstantLineMovedEventArgs e) {
    e.ConstantLine.Title.Text = String.Format("{0:f3}",e.ConstantLine.AxisValue);
}

VB.NET

Private Sub OnFormLoad(ByVal sender As Object, ByVal e As EventArgs)

    Dim constantLine As ConstantLine = New ConstantLine()
    constantLine.AxisValue = 65.0
    constantLine.Title.Text = "Title"
    constantLine.RuntimeTitleEditing = True
    constantLine.RuntimeMoving = True

    Dim diagram As XYDiagram = TryCast(chartControl1.Diagram, XYDiagram)
    diagram.AxisY.ConstantLines.Add(constantLine)

    chartControl1.ConstantLineMoved += AddressOf OnChartControlConstantLineMoved
End Sub

Private Sub OnChartControlConstantLineMoved(ByVal sender As Object, ByVal e As ConstantLineMovedEventArgs)
    e.ConstantLine.Title.Text = String.Format("{0:f3}", e.ConstantLine.AxisValue)
End Sub