How to: Create a 2D Line Chart

• Jun 07, 2019
• 3 minutes to read

The following example demonstrates how to create a 2D Line chart. To do this, it is necessary to assign the ChartControl.Diagram property to XYDiagram2D, and then add a LineSeries2D object with points to the diagram’s Diagram.Series collection.

Also, this example shows how to add a legend (showing series names) to a chart.

View Example

Window1.xaml

<Window x:Class="Line2DChart.Window1" 
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" 
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" 
        xmlns:dxc="http://schemas.devexpress.com/winfx/2008/xaml/charts" 
        xmlns:local ="clr-namespace:Line2DChart"
        Title="Window1" Height="350" Width="620">
    <Grid>
        <dxc:ChartControl Name="chartControl1">
            <dxc:ChartControl.DataContext>
                <local:ChartViewModel/>
            </dxc:ChartControl.DataContext>
            <dxc:ChartControl.Diagram>
                <dxc:XYDiagram2D>
                    <dxc:XYDiagram2D.Series>
                        <dxc:LineSeries2D DisplayName="Day Temperature" 
                                          DataSource="{Binding DataPoints}" 
                                          ArgumentScaleType="DateTime"
                                          ArgumentDataMember="Time"
                                          ValueDataMember="Value"
                                          LabelsVisibility="True"
                                          CrosshairLabelPattern="{}{A:MMMM}: {V:f2}&#176;C"
                                          MarkerSize="14" 
                                          MarkerVisible="True">
                            <dxc:LineSeries2D.MarkerModel>
                                <dxc:RingMarker2DModel/>
                            </dxc:LineSeries2D.MarkerModel>
                            <dxc:LineSeries2D.Label>
                                <dxc:SeriesLabel TextPattern="{}{V:f1}" 
                                                 dxc:MarkerSeries2D.Angle="90" 
                                                 ConnectorVisible="False"/>
                            </dxc:LineSeries2D.Label>
                        </dxc:LineSeries2D>
                    </dxc:XYDiagram2D.Series>
                </dxc:XYDiagram2D>
            </dxc:ChartControl.Diagram>
            <dxc:ChartControl.Legend>
                <dxc:Legend HorizontalPosition="Left"/>
            </dxc:ChartControl.Legend>
        </dxc:ChartControl>
    </Grid>
</Window>

Window1.xaml.cs

using System;
using System.Collections.Generic;
using System.Windows;

namespace Line2DChart {

    public partial class Window1 : Window {
        public Window1() {
            InitializeComponent();
        }
    }
    public class ChartViewModel {
        List<DataPoint> dataPoints;
        public List<DataPoint> DataPoints {
            get {
                if (dataPoints == null) {
                    dataPoints = new List<DataPoint> {
                            new DataPoint (new DateTime(2021, 1, 1), 7.2),
                            new DataPoint (new DateTime(2021, 2, 1), 8.3),
                            new DataPoint (new DateTime(2021, 3, 1), 12.2),
                            new DataPoint (new DateTime(2021, 4, 1), 15.6),
                            new DataPoint (new DateTime(2021, 5, 1), 19.6),
                            new DataPoint (new DateTime(2021, 6, 1), 22.7),
                            new DataPoint (new DateTime(2021, 7, 1), 25.2),
                            new DataPoint (new DateTime(2021, 8, 1), 25),
                            new DataPoint (new DateTime(2021, 9, 1), 21.1),
                            new DataPoint (new DateTime(2021, 10, 1), 16.3),
                            new DataPoint (new DateTime(2021, 11, 1), 10.8),
                            new DataPoint (new DateTime(2021, 12, 1), 7.5)
                };
                }
                return dataPoints;
            }
        }
    }
    public class DataPoint {
        public DateTime Time { get; set; }
        public double Value { get; set; }
        public DataPoint(DateTime time, double value) {
            this.Time = time;
            this.Value = value;
        }
    }
}

Window1.xaml.vb

Imports System
Imports System.Collections.Generic
Imports System.Windows

Namespace Line2DChart

    Public Partial Class Window1
        Inherits Window

        Public Sub New()
            Me.InitializeComponent()
        End Sub
    End Class

    Public Class ChartViewModel

        Private dataPointsField As List(Of DataPoint)

        Public ReadOnly Property DataPoints As List(Of DataPoint)
            Get
                If dataPointsField Is Nothing Then
                    dataPointsField = New List(Of DataPoint) From {New DataPoint(New DateTime(2021, 1, 1), 7.2), New DataPoint(New DateTime(2021, 2, 1), 8.3), New DataPoint(New DateTime(2021, 3, 1), 12.2), New DataPoint(New DateTime(2021, 4, 1), 15.6), New DataPoint(New DateTime(2021, 5, 1), 19.6), New DataPoint(New DateTime(2021, 6, 1), 22.7), New DataPoint(New DateTime(2021, 7, 1), 25.2), New DataPoint(New DateTime(2021, 8, 1), 25), New DataPoint(New DateTime(2021, 9, 1), 21.1), New DataPoint(New DateTime(2021, 10, 1), 16.3), New DataPoint(New DateTime(2021, 11, 1), 10.8), New DataPoint(New DateTime(2021, 12, 1), 7.5)}
                End If

                Return dataPointsField
            End Get
        End Property
    End Class

    Public Class DataPoint

        Public Property Time As Date

        Public Property Value As Double

        Public Sub New(ByVal time As Date, ByVal value As Double)
            Me.Time = time
            Me.Value = value
        End Sub
    End Class
End Namespace