PieSeriesLabel Class

Defines label settings for pie series.

Namespace: DevExpress.XtraCharts

Assembly: DevExpress.XtraCharts.v20.1.dll

Declaration

public class PieSeriesLabel :
    SeriesLabelBase
Public Class PieSeriesLabel
    Inherits SeriesLabelBase

Remarks

The PieSeriesLabel class provides label functionality for series of the pie view type.

In addition to the common settings inherited from the base SeriesLabelBase class, the PieSeriesLabel class declares pie type specific settings which allow you to define the label's position relative to the pie chart (PieSeriesLabel.Position) and specify the indent of the label columns from the pie (PieSeriesLabel.ColumnIndent).

An instance of the PieSeriesLabel class can be obtained via the SeriesBase.Label property of a series whose view type is PieSeriesView.

Examples

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.

NOTE

A complete sample project is available at https://github.com/DevExpress-Examples/how-to-create-a-pie-chart-e1189

using System;
using System.Windows.Forms;
using DevExpress.XtraCharts;
// ...

namespace Series_PieChart {
    public partial class Form1 : Form {
        public Form1() {
            InitializeComponent();
        }

        private void Form1_Load(object sender, EventArgs e) {
            // Create an empty chart.
            ChartControl pieChart = new ChartControl();

            // Create a pie series.
            Series series1 = new Series("A Pie Series", ViewType.Pie);

            // Populate the series with points.
            series1.Points.Add(new SeriesPoint("Russia", 17.0752));
            series1.Points.Add(new SeriesPoint("Canada", 9.98467));
            series1.Points.Add(new SeriesPoint("USA", 9.63142));
            series1.Points.Add(new SeriesPoint("China", 9.59696));
            series1.Points.Add(new SeriesPoint("Brazil", 8.511965));
            series1.Points.Add(new SeriesPoint("Australia", 7.68685));
            series1.Points.Add(new SeriesPoint("India", 3.28759));
            series1.Points.Add(new SeriesPoint("Others", 81.2));

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

            // Format the the series labels.
            series1.Label.TextPattern = "{A}: {VP:p0}";

            // 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;

            // Show a title for the series.
            myView.Titles.Add(new SeriesTitle());
            myView.Titles[0].Text = series1.Name;

            // 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;
            myView.HeightToWidthRatio = 0.75;

            // Hide the legend (if necessary).
            pieChart.Legend.Visibility = DevExpress.Utils.DefaultBoolean.False;

            // Add the chart to the form.
            pieChart.Dock = DockStyle.Fill;
            this.Controls.Add(pieChart);
        }
    }
}

Implements

See Also