CustomDrawCrosshairEventArgs.CrosshairLegendElements Property

Returns crosshair legend elements to customize their appearance.

Namespace: DevExpress.Xpf.Charts

Assembly: DevExpress.Xpf.Charts.v23.2.dll

NuGet Package: DevExpress.Wpf.Charts

Declaration

C#

public List<CrosshairLegendElement> CrosshairLegendElements { get; }

VB.NET

Public ReadOnly Property CrosshairLegendElements As List(Of CrosshairLegendElement)

Property Value

Type	Description
List<CrosshairLegendElement>	A collection of CrosshairLegendElement objects.

Remarks

If the CrosshairOptions.ContentShowMode (or XYSeries2D.CrosshairContentShowMode) property is Legend, use the CrosshairLegendElements property to customize legend elements when custom drawing a crosshair cursor using the ChartControl.CustomDrawCrosshair event.

Refer to the Tooltip and Crosshair Cursor document for more information on the Crosshair Cursor.

Example

This example demonstrates how to modify the Crosshair Cursor’s appearance using the ChartControl.CustomDrawCrosshair event.

In this sample, crosshair content is displayed in a legend. For this, set the CrosshairOptions.ContentShowMode to the Legend value that the CrosshairContentShowMode enumeration contains. Note that you can specify the crosshair’s content show mode for the specified series using the XYSeries2D.CrosshairContentShowMode property.

Use the CustomDrawCrosshairEventArgs.CrosshairLegendElements property to obtain the crosshair legend elements’ collection.

To customize each crosshair legend element options, use the CrosshairLegendElement class properties.

C#

using System.Windows;
using System.Windows.Media;
using DevExpress.Xpf.Charts;
namespace CustomDrawCrosshair {
    public partial class MainWindow : Window {
        const int ColorSelectorValue = 10;
        public MainWindow() {
            InitializeComponent();
        }
        private void OnCustomDrawCrosshair(object sender, CustomDrawCrosshairEventArgs e) {
            foreach(CrosshairLegendElement legendElement in e.CrosshairLegendElements) {
                legendElement.Foreground = (legendElement.SeriesPoint.Value > ColorSelectorValue) ? Brushes.Green : Brushes.Red;
                legendElement.LineElement.Brush = legendElement.Foreground;
                legendElement.AxisLabelElement.Background = legendElement.Foreground;
            }            
        }
    }
}

VB.NET

Imports System.Windows
Imports System.Windows.Media
Imports DevExpress.Xpf.Charts

Namespace CustomDrawCrosshair

    Public Partial Class MainWindow
        Inherits Window

        Const ColorSelectorValue As Integer = 10

        Public Sub New()
            InitializeComponent()
        End Sub

        Private Sub OnCustomDrawCrosshair(ByVal sender As Object, ByVal e As CustomDrawCrosshairEventArgs)
            For Each legendElement As CrosshairLegendElement In e.CrosshairLegendElements
                legendElement.Foreground = If((legendElement.SeriesPoint.Value > ColorSelectorValue), Brushes.Green, Brushes.Red)
                legendElement.LineElement.Brush = legendElement.Foreground
                legendElement.AxisLabelElement.Background = legendElement.Foreground
            Next
        End Sub
    End Class
End Namespace

XAML

<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:CustomDrawCrosshair"
        xmlns:dxc="http://schemas.devexpress.com/winfx/2008/xaml/charts" 
        x:Class="CustomDrawCrosshair.MainWindow"
        mc:Ignorable="d"
        Title="MainWindow" Height="450" Width="800">
    <Grid>
        <dxc:ChartControl CustomDrawCrosshair="OnCustomDrawCrosshair">
            <dxc:ChartControl.CrosshairOptions>
                <dxc:CrosshairOptions ContentShowMode="Legend"
                                      ShowValueLabels="True"
                                      ShowValueLine="True"/>
            </dxc:ChartControl.CrosshairOptions>
            <dxc:ChartControl.Legends>
                <dxc:Legend/>
            </dxc:ChartControl.Legends>
            <dxc:XYDiagram2D>
                <dxc:BarSideBySideSeries2D DisplayName="Series1">
                    <dxc:SeriesPoint Argument="A" Value="8.452"/>
                    <dxc:SeriesPoint Argument="B" Value="13.697"/>
                    <dxc:SeriesPoint Argument="C" Value="9.147"/>
                    <dxc:SeriesPoint Argument="D" Value="12.186"/>
                    <dxc:SeriesPoint Argument="E" Value="10.82"/>
                </dxc:BarSideBySideSeries2D>
                <dxc:BarSideBySideSeries2D DisplayName="Series2">
                    <dxc:SeriesPoint Argument="A" Value="10.89"/>
                    <dxc:SeriesPoint Argument="B" Value="8.254"/>
                    <dxc:SeriesPoint Argument="C" Value="11.196"/>
                    <dxc:SeriesPoint Argument="D" Value="13.327"/>
                    <dxc:SeriesPoint Argument="E" Value="9.75"/>
                </dxc:BarSideBySideSeries2D>
            </dxc:XYDiagram2D>
        </dxc:ChartControl>
    </Grid>
</Window>