Nested Doughnut Chart

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Short Description

The Nested Doughnut Chart is represented by the NestedDoughnutSeriesView object, which belongs to Pie and Donut Series Views. This view is similar to the Doughnut series view, but compares series with one doughnut nested in another one.

In the image below the Nested Doughnut chart shows the Age structure of the United States, Brazil and Russia population grouped by gender (Female and Male series).

NestedDoughnut

Note that to control the size of the nested doughnut's hole, use the DoughnutSeriesView.HoleRadiusPercent property. For example, in the above image, this property is set to 40.

You can define an inner indent between the nested doughnuts (NestedDoughnutSeriesView.InnerIndent), specify the relative size for the nested doughnut series (NestedDoughnutSeriesView.Weight), and create groups for similar Nested Doughnut series (NestedDoughnutSeriesView.Group).

Chart Type Characteristics

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

Feature Value
Series View type NestedDoughnutSeriesView
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 Nested Doughnut Chart, refer to the Series Views Compatibility document.

Example

The following example demonstrates how to create a ChartControl with a series of the NestedDoughnutSeriesView type, set its general properties, and add this chart to a form at runtime. Before proceeding with this example, create a Windows Forms Application in Visual Studio, and add all required assemblies in the References list of your project.

Then, add the following code to the Form.Load event handler.

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

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

        private void Form1_Load(object sender, EventArgs e) {
            // Create a new chart.
            ChartControl NestedDoughnutChart = new ChartControl();

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

            // Create a first nested doughnut series.
            Series series1 = new Series("Male", ViewType.NestedDoughnut);

            // Populate the series with points.
            series1.Points.Add(new SeriesPoint("0-14 years", 29.956));
            series1.Points.Add(new SeriesPoint("15-64 years", 25.607));
            series1.Points.Add(new SeriesPoint("65 years and older", 13.493));

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

            // Create a second nested doughnut series.
            Series series2 = new Series("Female", ViewType.NestedDoughnut);

            // Populate the series with points.
            series2.Points.Add(new SeriesPoint("0-14 years", 90.354));
            series2.Points.Add(new SeriesPoint("15-64 years", 55.793));
            series2.Points.Add(new SeriesPoint("65 years and older", 48.983));

            // Add the second series to the chart.
            NestedDoughnutChart.Series.Add(series2);

            // Specify the hole radius percentage and inner indent of the nested doughnut.
            ((NestedDoughnutSeriesView)series1.View).InnerIndent = 8;
            ((NestedDoughnutSeriesView)series1.View).HoleRadiusPercent = 30;

            // Specify the legend text pattern for the first series.
            series1.LegendTextPattern = "{A}";

            // Hide a legend for the second series.
            series2.ShowInLegend = false;

            // Enable a tooltip and specify the tooltip point pattern for series. 
            NestedDoughnutChart.ToolTipEnabled = DefaultBoolean.True;
            series1.ToolTipPointPattern = "{S}:{VP:##.##%}";
            series2.ToolTipPointPattern = "{S}:{VP:##.##%}";

            // Hide series labels.
            series1.LabelsVisibility = DefaultBoolean.False;
            series2.LabelsVisibility = DefaultBoolean.False;

            // Add a title to the chart.
            ChartTitle chartTitle1 = new ChartTitle();
            chartTitle1.Text = "Nested Doughnut Chart";
            NestedDoughnutChart.Titles.Add(chartTitle1);
        }
    }
}