PieSeriesLabel.Position Property

Gets or sets the position of labels relative to each other and the pie diagram.

Namespace: DevExpress.XtraCharts

Assembly: DevExpress.XtraCharts.v24.2.dll

Declaration

C#

[XtraChartsLocalizableCategory(XtraChartsCategory.Behavior)]
public PieSeriesLabelPosition Position { get; set; }

VB.NET

<XtraChartsLocalizableCategory(XtraChartsCategory.Behavior)>
Public Property Position As PieSeriesLabelPosition

Property Value

Type	Description
PieSeriesLabelPosition	An PieSeriesLabelPosition enumeration value which specifies the position of labels relative to each other and to the pie diagram.

Available values:

Name	Description
Inside	Specifies that point labels should be painted directly on the corresponding slice of a Pie chart.
Outside	Specifies that point labels should be painted outside a Pie chart, near the corresponding slice.
TwoColumns	Specifies that point labels should be painted outside a Pie chart and organized into two columns on the left and right of the Pie chart.
Radial	Specifies that point labels should be painted radially on the corresponding slices of a Pie chart.
Tangent	Specifies that point labels should be painted tangentially on the corresponding slices of a Pie chart.

Remarks

Refer to the PieSeriesLabelPosition enumeration’s description for a list of the available label positions.

Example

The following example shows how to create a Pie chart at runtime.

View Example

The Chart Control uses the Simple Diagram to display pies. Cast the ChartControl.Diagram property to the SimpleDiagram type to access diagram settings. The Chart Control determines the diagram type based on the series that is added first. We recommend that you access the diagram to configure its settings after at least one series is added to the chart.

To access pie series view settings, cast the SeriesBase.View property to the PieSeriesView type.

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);

            // Access diagram settings.
            SimpleDiagram diagram = (SimpleDiagram)pieChart.Diagram;
            diagram.Margins.All = 10;

            // 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 the pie rotation.
            myView.Rotation = -60;

            // 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)

            ' Access diagram settings.
            Dim diagram As SimpleDiagram = CType(pieChart.Diagram, SimpleDiagram)
            diagram.Margins.All = 10

            ' 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

            ' Specify the pie rotation.
            myView.Rotation = -60

            ' 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