Java/Chart/Polar Chart

JFreeChart: Polar Chart Demo

   <source lang="java">

/* ===========================================================

* JFreeChart : a free chart library for the Java(tm) platform
* ===========================================================
*
* (C) Copyright 2000-2004, by Object Refinery Limited and Contributors.
*
* Project Info:  http://www.jfree.org/jfreechart/index.html
*
* This library is free software; you can redistribute it and/or modify it under the terms
* of the GNU Lesser General Public License as published by the Free Software Foundation;
* either version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY;
* without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
* See the GNU Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License along with this
* library; if not, write to the Free Software Foundation, Inc., 59 Temple Place, Suite 330,
* Boston, MA 02111-1307, USA.
*
* [Java is a trademark or registered trademark of Sun Microsystems, Inc. 
* in the United States and other countries.]
*
* -------------------
* PolarChartDemo.java
* -------------------
* (C) Copyright 2004, by Solution Engineering, Inc. and Contributors.
*
* Original Author:  Daniel Bridenbecker, Solution Engineering, Inc.;
* Contributor(s):   David Gilbert (for Object Refinery Limited);
*
* $Id: PolarChartDemo.java,v 1.4 2004/04/30 11:19:22 mungady Exp $
*
* Changes
* -------
* 19-Jan-2004 : Version 1, contributed by DB with minor changes by DG (DG);
*
*/

package org.jfree.chart.demo; import java.awt.Dimension; import org.jfree.chart.ChartFactory; import org.jfree.chart.ChartPanel; import org.jfree.chart.JFreeChart; import org.jfree.chart.PolarChartPanel; import org.jfree.chart.plot.PolarPlot; import org.jfree.chart.renderer.DefaultPolarItemRenderer; 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; /**

* PolarChartDemo demonstrates the capabilities of the {@link PolarPlot}.
* 
* @author  Daniel Bridenbecker, Solution Engineering, Inc.
*/

public class PolarChartDemo extends ApplicationFrame {

   /**
    * Creates a new instance of the demo.
    * 
    * @param title  the frame title.
    */
   public PolarChartDemo(final String title) {
       super(title);
       final XYDataset dataset = createDataset();
       final JFreeChart chart = createChart(dataset);
       final ChartPanel chartPanel = new PolarChartPanel(chart);
       chartPanel.setPreferredSize(new Dimension(500, 270));
       chartPanel.setEnforceFileExtensions(false);
       setContentPane(chartPanel);
   }
   
   /**
    * Creates a sample dataset.
    * 
    * @return A sample dataset.
    */
   private XYDataset createDataset() {    
       final XYSeriesCollection data = new XYSeriesCollection();
       final XYSeries series1 = createRandomData("Series 1", 75.0, 10.0);
       final XYSeries series2 = createRandomData("Series 2", 50.0, 5.0);
       final XYSeries series3 = createRandomData("Series 3", 25.0, 1.0);
       data.addSeries(series1);
       data.addSeries(series2);
       data.addSeries(series3);
       return data;
   }
   
   /**
    * Creates a sample chart.
    * 
    * @param dataset  the dataset.
    * 
    * @return A sample chart.
    */
   private JFreeChart createChart(final XYDataset dataset) {
       final JFreeChart chart = ChartFactory.createPolarChart(
           "Polar Chart Demo", dataset, true, true, false
       ); 
       final PolarPlot plot = (PolarPlot) chart.getPlot();
       final DefaultPolarItemRenderer renderer = (DefaultPolarItemRenderer) plot.getRenderer();
       renderer.setSeriesFilled(2, true);
       return chart;
   }
   
   /**
    * Creates a series containing random data.
    * 
    * @param name  the series name.
    * @param baseRadius  the base radius.
    * @param thetaInc  the angle increment.
    * 
    * @return The series.
    */
   private static XYSeries createRandomData(final String name, 
                                            final double baseRadius, 
                                            final double thetaInc) {
       final XYSeries series = new XYSeries(name);
       for (double theta = 0.0; theta < 360.0; theta += thetaInc) {
           final double radius = baseRadius * (1.0 + Math.random());
           series.add(theta, radius);
       }
       return series;
   }
   
   /**
    * Main program that creates a thermometer and places it into
    * a JFrame.
    *
    * @param argv Command line arguements - none used.
    */
   public static void main(final String[] argv) {
        
       final PolarChartDemo demo = new PolarChartDemo("Polar Chart Demo");
       demo.pack();
       RefineryUtilities.centerFrameOnScreen(demo);
       demo.setVisible(true);
       
   }   
      

}

      </source>