Pie Chart

• Jul 02, 2024
• 5 minutes to read

Short Description

The Pie Chart is represented by the PieSeriesView object, which belongs to Pie and Donut Series Views. This view is useful when it’s necessary to compare the percentage values of different point arguments in the same series, and to illustrate these values as easy to understand pie slices.

A Pie chart is shown in the image below. Note that if a chart contains several series of the PieSeriesView type, all these series are displayed in the same diagram according to the SimpleDiagram.Dimension and SimpleDiagram.LayoutDirection property values.

Chart Type Characteristics

The table below lists the main characteristics of this chart type.

Feature	Value
Series View type	PieSeriesView
Diagram type	2D-SimpleDiagram
Number of arguments per series point	1
Number of values per series point	1

Note

For information on which chart types can be combined with the Pie Chart, refer to the Series Views Compatibility document.

Example

The following example demonstrates how to create a ChartControl with a series of the PieSeriesView type, and add this chart to a form at runtime.

Note that this series view type is associated with the SimpleDiagram type, and you should cast your diagram object to this type, in order to access its specific options.

View Example

Form1.cs

using System;
using System.Collections.Generic;
using System.Windows.Forms;
using DevExpress.XtraCharts;

namespace Series_PieChart {
    public partial class Form1 : DevExpress.XtraEditors.XtraForm {
        public Form1() {
            InitializeComponent();
        }
        private void Form1_Load(object sender, EventArgs e) {
            // Create an empty chart.
            ChartControl pieChart = new ChartControl();

            pieChart.Titles.Add(new ChartTitle() { Text = "Land Area by Country" });

            // Create a pie series.
            Series series1 = new Series("Land Area by Country", ViewType.Pie);

            // Bind the series to data.
            series1.DataSource = DataPoint.GetDataPoints();
            series1.ArgumentDataMember = "Argument";
            series1.ValueDataMembers.AddRange(new string[] { "Value" });

            // Add the series to the chart.
            pieChart.Series.Add(series1);

            // Format the the series labels.
            series1.Label.TextPattern = "{VP:p0} ({V:.##}M km²)";

            // Format the series legend items.
            series1.LegendTextPattern = "{A}";

            // Adjust the position of series labels. 
            ((PieSeriesLabel)series1.Label).Position = PieSeriesLabelPosition.TwoColumns;

            // Detect overlapping of series labels.
            ((PieSeriesLabel)series1.Label).ResolveOverlappingMode = ResolveOverlappingMode.Default;

            // Access the view-type-specific options of the series.
            PieSeriesView myView = (PieSeriesView)series1.View;

            // Specify a data filter to explode points.
            myView.ExplodedPointsFilters.Add(new SeriesPointFilter(SeriesPointKey.Value_1,
                DataFilterCondition.GreaterThanOrEqual, 9));
            myView.ExplodedPointsFilters.Add(new SeriesPointFilter(SeriesPointKey.Argument,
                DataFilterCondition.NotEqual, "Others"));
            myView.ExplodeMode = PieExplodeMode.UseFilters;
            myView.ExplodedDistancePercentage = 30;
            myView.RuntimeExploding = true;

            // Customize the legend.
            pieChart.Legend.Visibility = DevExpress.Utils.DefaultBoolean.True;

            // Add the chart to the form.
            pieChart.Dock = DockStyle.Fill;
            this.Controls.Add(pieChart);
        }
    }
    public class DataPoint {
        public string Argument { get; set; }
        public double Value { get; set; }

        public static List<DataPoint> GetDataPoints() {
            return new List<DataPoint> {
                    new DataPoint { Argument = "Russia",    Value = 17.0752},
                    new DataPoint { Argument = "Canada",    Value = 9.98467},
                    new DataPoint { Argument = "USA",       Value = 9.63142},
                    new DataPoint { Argument = "China",     Value = 9.59696},
                    new DataPoint { Argument = "Brazil",    Value = 8.511965},
                    new DataPoint { Argument = "Australia", Value = 7.68685},
                    new DataPoint { Argument = "India",     Value = 3.28759},
                    new DataPoint { Argument = "Others",    Value = 81.2}
                };
        }
    }
}

Form1.vb

Imports System
Imports System.Collections.Generic
Imports System.Windows.Forms
Imports DevExpress.XtraCharts
' ...

Namespace Series_PieChart
    Partial Public Class Form1
        Inherits DevExpress.XtraEditors.XtraForm

        Public Sub New()
            InitializeComponent()
        End Sub

        Private Sub Form1_Load(ByVal sender As Object, ByVal e As EventArgs) Handles Me.Load
            ' Create an empty chart.
            Dim pieChart As New ChartControl()

            pieChart.Titles.Add(New ChartTitle() With {.Text = "Land Area by Country"})

            ' Create a pie series.
            Dim series1 As New Series("Land Area by Country", ViewType.Pie)

            ' Bind the series to data.
            series1.DataSource = DataPoint.GetDataPoints()
            series1.ArgumentDataMember = "Argument"
            series1.ValueDataMembers.AddRange(New String() { "Value" })

            ' Add the series to the chart.
            pieChart.Series.Add(series1)

            ' Format the the series labels.
            series1.Label.TextPattern = "{VP:p0} ({V:.##}M km²)"

            ' Format the series legend items.
            series1.LegendTextPattern = "{A}"

            ' Adjust the position of series labels. 
            CType(series1.Label, PieSeriesLabel).Position = PieSeriesLabelPosition.TwoColumns

            ' Detect overlapping of series labels.
            CType(series1.Label, PieSeriesLabel).ResolveOverlappingMode = ResolveOverlappingMode.Default

            ' Access the view-type-specific options of the series.
            Dim myView As PieSeriesView = CType(series1.View, PieSeriesView)

            ' Specify a data filter to explode points.
            myView.ExplodedPointsFilters.Add(New SeriesPointFilter(SeriesPointKey.Value_1, DataFilterCondition.GreaterThanOrEqual, 9))
            myView.ExplodedPointsFilters.Add(New SeriesPointFilter(SeriesPointKey.Argument, DataFilterCondition.NotEqual, "Others"))
            myView.ExplodeMode = PieExplodeMode.UseFilters
            myView.ExplodedDistancePercentage = 30
            myView.RuntimeExploding = True

            ' Customize the legend.
            pieChart.Legend.Visibility = DevExpress.Utils.DefaultBoolean.True

            ' Add the chart to the form.
            pieChart.Dock = DockStyle.Fill
            Me.Controls.Add(pieChart)
        End Sub
    End Class
    Public Class DataPoint
        Public Property Argument() As String
        Public Property Value() As Double

        Public Shared Function GetDataPoints() As List(Of DataPoint)
            Return New List(Of DataPoint) From {
                New DataPoint With { .Argument = "Russia", .Value = 17.0752 },
                New DataPoint With { .Argument = "Canada", .Value = 9.98467 },
                New DataPoint With { .Argument = "USA", .Value = 9.63142 },
                New DataPoint With { .Argument = "China", .Value = 9.59696 },
                New DataPoint With { .Argument = "Brazil", .Value = 8.511965 },
                New DataPoint With { .Argument = "Australia", .Value = 7.68685 },
                New DataPoint With { .Argument = "India", .Value = 3.28759 },
                New DataPoint With { .Argument = "Others", .Value = 81.2 }
            }
        End Function
    End Class
End Namespace

More Examples

• How to: Implement a Custom Pie Animation
• How to: Explode Points of a Pie Chart
• How to: Specify the Appearance of the Pie Chart Using Its Pattern at Runtime
• How to: Show N Top Points as a Single Section in a Pie Chart