Pie Chart
- 4 minutes to read
Short Description
The Pie Chart is represented by the PieSeriesView object, which belongs to Pie, Doughnut and Funnel Series Views. This view allows you 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 multiple series of the PieSeriesView type, all series are displayed in the same diagram based on 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 following help topic: Combining Different Series Views.
Example
The following example creates a ChartControl with a series of the PieSeriesView type, and adds 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.
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 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);
}
}
}
Tip
For the complete sample project, see the following DevExpress Support Center example: https://supportcenter.devexpress.com/ticket/details/e1189/how-to-create-a-pie-chart.