Polar Point Chart
- 3 minutes to read
Short Description
The Polar Point Chart is represented by the PolarPointSeriesView object, which belongs to Polar Series Views. This view allows you to show points from two or more different series on the same circular diagram with angles as arguments. Note that although these charts normally have a circular shape, they can also be displayed as a polygon. To specify the chart’s shape, use the RadarDiagram.DrawingStyle property.
A Polar Point chart is shown in the image below.
Chart Type Characteristics
The table below lists the main characteristics of this chart type.
| Feature | Value |
|---|---|
| Series View type | PolarPointSeriesView |
| Diagram type | PolarDiagram |
| 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 Polar Point Chart, refer to the following help topic: Combining Different Series Views.
Example
The following example creates a ChartControl with a series of the PolarPointSeriesView type, sets its general properties, and adds this chart to a form at runtime. Before proceeding with this example, first create a Windows Forms Application in Visual Studio, and add all required assemblies to the project’s References list.
Then, add the following code to the Form.Load event handler.
using System;
using System.Windows.Forms;
using DevExpress.XtraCharts;
// ...
private void Form1_Load(object sender, EventArgs e) {
// Create a new chart.
ChartControl polarPointChart = new ChartControl();
// Add a polar series to it.
Series series1 = new Series("Series 1", ViewType.PolarPoint);
// Populate the series with points.
series1.Points.Add(new SeriesPoint(0, 90));
series1.Points.Add(new SeriesPoint(45, 70));
series1.Points.Add(new SeriesPoint(90, 50));
series1.Points.Add(new SeriesPoint(135, 100));
series1.Points.Add(new SeriesPoint(180, 90));
series1.Points.Add(new SeriesPoint(225, 70));
series1.Points.Add(new SeriesPoint(270, 50));
// Add the series to the chart.
polarPointChart.Series.Add(series1);
// Adjust the view-type specific properties of the series.
PolarPointSeriesView myView = (PolarPointSeriesView)series1.View;
myView.PointMarkerOptions.Kind = MarkerKind.Star;
myView.PointMarkerOptions.StarPointCount = 5;
myView.PointMarkerOptions.Size = 20;
// Flip the diagram (if necessary).
((PolarDiagram)polarPointChart.Diagram).StartAngleInDegrees = 180;
((PolarDiagram)polarPointChart.Diagram).RotationDirection =
RadarDiagramRotationDirection.Counterclockwise;
// Add a title to the chart, and hide the legend.
polarPointChart.Titles.Add(new ChartTitle());
polarPointChart.Titles[0].Text = "A Polar Point Chart";
polarPointChart.Legend.Visible = false;
// Add the chart to the form.
polarPointChart.Dock = DockStyle.Fill;
this.Controls.Add(polarPointChart);
}