This Example shows you how to create a polar chart using JFreeChart. Code given below creates a simple polar chart for the given values.

Create a polar chart using JFreeChart

     

This Example shows you how to create a polar chart using JFreeChart. Code given below creates a simple polar chart for the given values. In the code given below we have extended class ApplicationFrame to create a frame and also pass a string value to the constructor of ApplicationFrame class by using super keyword that will be name of the created frame.

Methods used in this example are described below:

pack(): This method invokes the layout manager.

centerFrameOnScreen(): This method is used for the position of the frame in the middle of the screen.

setVisible(): This method is used for display frame on the screen.

createCategoryDataset(): This method is used to create the instance of CategoryDataset Interface and that contains a copy of the data in an array.

createPolarChart(): This method is used to create bar chart for given values. It takes title, dataset, legend, tool tips and urls as parameters.

saveChartAsPNG(): This method is used to save chart in to png format.

PolarChart.java

import org.jfree.chart.ChartFactory; import org.jfree.chart.ChartPanel; import org.jfree.chart.JFreeChart; import org.jfree.data.xy.XYDataset; import org.jfree.data.xy.XYSeries; import org.jfree.data.xy.XYSeriesCollection; import org.jfree.ui.ApplicationFrame; import org.jfree.ui.RefineryUtilities; public class PolarChart extends ApplicationFrame {   public PolarChart(String titel) {   super(titel);   XYDataset dataset = createDataset();   JFreeChart chart = createChart(dataset);      ChartPanel chartPanel = new ChartPanel(chart);   chartPanel.setPreferredSize(new java.awt.Dimension(600, 600));   setContentPane(chartPanel);   }   private XYDataset createDataset() {   final XYSeriesCollection data = new XYSeriesCollection();   XYSeries series = new XYSeries("Average Size");   series.add(45, 40.0);   series.add(135.0, 45.0);   series.add(270.0, 40.0);   data.addSeries(series);   return data;   }   private JFreeChart createChart(XYDataset dataset) {   JFreeChart chart = ChartFactory.createPolarChart(   "Polar Chart", dataset, true, true, false   );    return chart;   }   public static void main(final String[] args) {   PolarChart chart = new PolarChart("Polar Chart");   chart.pack();   RefineryUtilities.centerFrameOnScreen(chart);   chart.setVisible(true);   } }

Output:

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