Diagram Class

Represents the base class for classes that provide diagrams functionality for a chart control.

Assembly : DevExpress.Xpf.Charts.v25.2.dll

NuGet Package : DevExpress.Wpf.Charts

Declaration

C#
VB.NET

csharp

public abstract class Diagram :
    ChartElement,
    IDiagram,
    IChartDiagram,
    IInteractiveElement,
    IVisualChildOwner,
    ISeriesTemplateContainer

Public MustInherit Class Diagram
    Inherits ChartElement
    Implements IDiagram,
               IChartDiagram,
               IInteractiveElement,
               IVisualChildOwner,
               ISeriesTemplateContainer

The following members return Diagram objects:

Remarks

Each group of similar series types demands its own associated diagram type.

The Diagram class serves as a base for classes which provide common functionality for different diagram types available for a chart control. The Diagram class implements the base diagram functionality that is common to all diagram types, and possesses a collection of Diagram.Series that will represent this diagram.

Note that a single diagram type can only correspond to a single chart control instance.

For more information, refer to Diagram and Series Type Compatibility.

Example

This example shows how to create a 2D Side-by-Side Bar chart.

Create a ChartControl and set its ChartControl.Diagram property to a XYDiagram2D object. Note that the ChartControl.Diagram is a content property. You can declare a diagram in XAML directly after a chart control’s declaration without wrapping it in opening and closing ChartControl.Diagram tags.
Specify the Diagram.SeriesItemsSource property to bind a collection of objects used to generate series.
Use the following API members to configure the x-axis options.
Create a legend and customize its settings. For more information about legends, refer to the following topic: Legends

View Example: Chart for WPF - Create a 2D Side-by-Side Bar Chart

XAML

xaml

<Window x:Class="SideBySideBar2DChart.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:SideBySideBar2DChart"
        Title="Window1" Height="350" Width="620">
    <Window.DataContext>
        <local:ChartViewModel/>
    </Window.DataContext>
    <Grid>
        <dxc:ChartControl Name="chartControl1">
            <dxc:ChartControl.Diagram>
                <dxc:XYDiagram2D SeriesItemsSource="{Binding Data}">
                    <dxc:XYDiagram2D.SeriesItemTemplate>
                        <DataTemplate>
                            <dxc:BarSideBySideSeries2D DisplayName="{Binding Name}" 
                                               DataSource="{Binding Values}"
                                               ArgumentDataMember="Argument"
                                               ValueDataMember="Value" 
                                               BarWidth="0.6">
                                <dxc:BarSideBySideSeries2D.Model>
                                    <dxc:BorderlessSimpleBar2DModel/>
                                </dxc:BarSideBySideSeries2D.Model>
                            </dxc:BarSideBySideSeries2D>
                        </DataTemplate>
                    </dxc:XYDiagram2D.SeriesItemTemplate>
                    <dxc:XYDiagram2D.AxisX>
                        <dxc:AxisX2D>
                            <dxc:AxisX2D.DateTimeScaleOptions>
                                <dxc:ManualDateTimeScaleOptions MeasureUnit="Year" GridAlignment="Year" 
                                                                AutoGrid="False" GridSpacing="1"/>
                            </dxc:AxisX2D.DateTimeScaleOptions>
                        </dxc:AxisX2D>
                    </dxc:XYDiagram2D.AxisX>
                </dxc:XYDiagram2D>
            </dxc:ChartControl.Diagram>
            <dxc:ChartControl.Legends>
                <dxc:Legend HorizontalPosition="Right"/>
            </dxc:ChartControl.Legends>
        </dxc:ChartControl>
    </Grid>
</Window>

C#
VB.NET

csharp

using System;
using System.Collections.ObjectModel;
using System.Windows;
namespace SideBySideBar2DChart {
    public partial class Window1 : Window {
        public Window1() {
            InitializeComponent();
        }
    }
    public class ChartViewModel {
        public ObservableCollection<DataSeries> Data { get; private set; }

        public ChartViewModel() {
            Data = new ObservableCollection<DataSeries> {
                new DataSeries{
                    Name = "DevAV North",
                    Values = new ObservableCollection<DataPoint> {
                        new DataPoint (new DateTime(2013,12,31), 362.5),
                        new DataPoint (new DateTime(2014,12,31), 348.4),
                        new DataPoint (new DateTime(2015,12,31), 279.0),
                        new DataPoint (new DateTime(2016,12,31), 230.9),
                        new DataPoint (new DateTime(2017,12,31), 203.5),
                        new DataPoint (new DateTime(2018,12,31), 197.1)
                    }
                },
                new DataSeries{
                    Name = "DevAV South",
                    Values = new ObservableCollection<DataPoint> {
                        new DataPoint (new DateTime(2013,12,31), 277.0),
                        new DataPoint (new DateTime(2014,12,31), 328.5),
                        new DataPoint (new DateTime(2015,12,31), 297.0),
                        new DataPoint (new DateTime(2016,12,31), 255.3),
                        new DataPoint (new DateTime(2017,12,31), 173.5),
                        new DataPoint (new DateTime(2018,12,31), 131.8)
                    }
                }
            };
        }
        public class DataSeries {
            public string Name { get; set; }
            public ObservableCollection<DataPoint> Values { get; set; }
        }
        public class DataPoint {
            public DateTime Argument { get; set; }
            public double Value { get; set; }
            public DataPoint(DateTime argument, double value) {
                Argument = argument;
                Value = value;
            }
        }
    }
}

Imports System
Imports System.Collections.ObjectModel

Namespace SideBySideBar2DChart
    Public Partial Class Window1
        Inherits Window

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

    Public Class ChartViewModel
        Private _Data As System.Collections.ObjectModel.ObservableCollection(Of SideBySideBar2DChart.ChartViewModel.DataSeries)

        Public Property Data As ObservableCollection(Of DataSeries)
            Get
                Return _Data
            End Get
            Private Set(ByVal value As ObservableCollection(Of DataSeries))
                _Data = value
            End Set
        End Property

        Public Sub New()
            Data = New ObservableCollection(Of DataSeries) From {
                New DataSeries With {
                    .Name = "DevAV North",
                    .Values = New ObservableCollection(Of DataPoint) From {
                        New DataPoint(New DateTime(2013, 12, 31), 362.5),
                        New DataPoint(New DateTime(2014, 12, 31), 348.4),
                        New DataPoint(New DateTime(2015, 12, 31), 279.0),
                        New DataPoint(New DateTime(2016, 12, 31), 230.9),
                        New DataPoint(New DateTime(2017, 12, 31), 203.5),
                        New DataPoint(New DateTime(2018, 12, 31), 197.1)
                    }
                },
                New DataSeries With {
                    .Name = "DevAV South",
                    .Values = New ObservableCollection(Of DataPoint) From {
                        New DataPoint(New DateTime(2013, 12, 31), 277.0),
                        New DataPoint(New DateTime(2014, 12, 31), 328.5),
                        New DataPoint(New DateTime(2015, 12, 31), 297.0),
                        New DataPoint(New DateTime(2016, 12, 31), 255.3),
                        New DataPoint(New DateTime(2017, 12, 31), 173.5),
                        New DataPoint(New DateTime(2018, 12, 31), 131.8)
                    }
                }
            }
        End Sub

        Public Class DataSeries
            Public Property Name As String
            Public Property Values As ObservableCollection(Of DataPoint)
        End Class

        Public Class DataPoint
            Public Property Argument As Date
            Public Property Value As Double

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