ConstantLine.LegendMarkerTemplate Property

Gets or sets the template that defines the legend marker presentation for this constant line.

Namespace: DevExpress.Xpf.Charts

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

NuGet Package: DevExpress.Wpf.Charts

Declaration

C#

public DataTemplate LegendMarkerTemplate { get; set; }

VB.NET

Public Property LegendMarkerTemplate As DataTemplate

Property Value

Type	Description
DataTemplate	A DataTemplate object that contains the template for a legend marker.

Example

This example shows how to apply the LegendMarkerTemplate property to change a constant line‘s marker at design time and runtime.

Use the following API members to create and customize a constant line:

Member	Description
Axis2D.ConstantLinesInFront	Provides access to the axis’ collection of constant lines that are drawn in front of series. This is a dependency property.
ConstantLine	Represents a constant line of an axis.
ConstantLine.Value	Gets or sets the constant line‘s position along an axis.
ConstantLine.LegendText	Gets or sets the legend’s text for the constant line.
ConstantLine.LegendMarkerTemplate	Gets or sets the template that defines the legend marker presentation for this constant line.
ConstantLine.LineStyle	Specifies the constant line‘s style settings.

XAML

<Window x:Class="WpfApplication14.MainWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        Title="MainWindow" Height="350" Width="525" 
        xmlns:dxc="http://schemas.devexpress.com/winfx/2008/xaml/charts">
    <Grid>
        <dxc:ChartControl Name="chartControl1">
            <dxc:ChartControl.Resources>
                <DataTemplate x:Key="LegendMarkerTemplate">
                    <Border BorderThickness="1" 
                            BorderBrush="{Binding Path=MarkerLineBrush}">
                        <Path x:Name = "MarkerPath"
                              Stretch="Fill"
                              Fill="{Binding Path=MarkerBrush}"
                              Stroke="{Binding Path=MarkerLineBrush}"
                              StrokeThickness="{Binding Path=MarkerLineStyle.Thickness}"
                              StrokeDashArray="{Binding Path=MarkerLineStyle.DashStyle.Dashes}"
                              StrokeDashOffset="{Binding Path=MarkerLineStyle.DashStyle.Offset}"
                              StrokeDashCap="{Binding Path=MarkerLineStyle.DashCap}"
                              StrokeLineJoin="{Binding Path=MarkerLineStyle.LineJoin}"
                              StrokeMiterLimit="{Binding Path=MarkerLineStyle.MiterLimit}"
                              SnapsToDevicePixels="True"
                              StrokeStartLineCap="Square"
                              StrokeEndLineCap="Square">
                            <Path.Data>
                                <LineGeometry StartPoint="0,0" EndPoint="10,0"/>
                            </Path.Data>
                        </Path>
                    </Border>
                </DataTemplate>
            </dxc:ChartControl.Resources>
            <dxc:ChartControl.Legends>
                <dxc:Legend/>
            </dxc:ChartControl.Legends>
            <dxc:ChartControl.Diagram>
                <dxc:XYDiagram2D>
                    <dxc:XYDiagram2D.AxisY>
                        <dxc:AxisY2D>
                            <dxc:AxisY2D.ConstantLinesInFront>
                                <dxc:ConstantLine Value="0.5" Brush="Green" 
                                                  LegendText="Design time CL" 
                                                  LegendMarkerTemplate="{StaticResource LegendMarkerTemplate}">
                                    <dxc:ConstantLine.LineStyle>
                                        <dxc:LineStyle Thickness="2" >
                                            <dxc:LineStyle.DashStyle>
                                                <DashStyle Dashes="2 2" />
                                            </dxc:LineStyle.DashStyle>
                                        </dxc:LineStyle>
                                    </dxc:ConstantLine.LineStyle>
                                </dxc:ConstantLine>
                            </dxc:AxisY2D.ConstantLinesInFront>
                        </dxc:AxisY2D>
                    </dxc:XYDiagram2D.AxisY>
                    <dxc:XYDiagram2D.Series>
                        <dxc:LineSeries2D DisplayName="Series" 
                                          MarkerVisible="True" 
                                          ShowInLegend="False">
                            <dxc:LineSeries2D.Points>
                                <dxc:SeriesPoint Argument="A" Value="3" />
                                <dxc:SeriesPoint Argument="B" Value="2" />
                                <dxc:SeriesPoint Argument="C" Value="3" />
                                <dxc:SeriesPoint Argument="D" Value="5" />
                            </dxc:LineSeries2D.Points>
                        </dxc:LineSeries2D>
                    </dxc:XYDiagram2D.Series>
                </dxc:XYDiagram2D>
            </dxc:ChartControl.Diagram>
        </dxc:ChartControl>
    </Grid>
</Window>

C#

using DevExpress.Xpf.Charts;
using System.Windows;

namespace WpfApplication14 {
    /// <summary>
    /// Interaction logic for MainWindow.xaml
    /// </summary>
    public partial class MainWindow : Window {
        public MainWindow() {
            InitializeComponent();
            XYDiagram2D diagram = ((XYDiagram2D)chartControl1.Diagram);
            diagram.ActualAxisY.ConstantLinesBehind.Add(
                new ConstantLine() {
                    Value = 4.5,
                    LegendText = "Runtime CL",
                    LegendMarkerTemplate = chartControl1.FindResource("LegendMarkerTemplate") as DataTemplate
                });
        }
    }
}

VB.NET

Imports DevExpress.Xpf.Charts
Imports System.Windows

Namespace WpfApplication14
    ''' <summary>
    ''' Interaction logic for MainWindow.xaml
    ''' </summary>
    Partial Public Class MainWindow
        Inherits Window

        Public Sub New()
            InitializeComponent()
            Dim diagram As XYDiagram2D = (CType(chartControl1.Diagram, XYDiagram2D))
            diagram.ActualAxisY.ConstantLinesBehind.Add(New ConstantLine() With {
                .Value = 4.5,
                .LegendText = "Runtime CL",
                .LegendMarkerTemplate = TryCast(chartControl1.FindResource("LegendMarkerTemplate"), DataTemplate)
            })
        End Sub
    End Class
End Namespace

Implements

LegendMarkerTemplate