Java/Chart/Statistical Bar Chart

JFreeChart: Statistical Bar 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.]
*
* ----------------------------
* StatisticalBarChartDemo.java
* ----------------------------
* (C) Copyright 2002-2004, by Pascal Collet and Contributors.
*
* Original Author:  Pascal Collet;
* Contributor(s):   David Gilbert (for Object Refinery Limited);
*
* $Id: StatisticalBarChartDemo.java,v 1.15 2004/05/07 15:51:37 mungady Exp $
*
* Changes
* -------
* 21-Aug-2002 : Version 1, contributed by Pascal Collet (DG);
* 11-Oct-2002 : Fixed errors reported by Checkstyle (DG);
* 05-Feb-2003 : Updated for documentation (DG);
*
*/

package org.jfree.chart.demo; import java.awt.Font; import org.jfree.chart.ChartPanel; import org.jfree.chart.JFreeChart; import org.jfree.chart.axis.CategoryAxis; import org.jfree.chart.axis.NumberAxis; import org.jfree.chart.axis.ValueAxis; import org.jfree.chart.plot.CategoryPlot; import org.jfree.chart.renderer.category.CategoryItemRenderer; import org.jfree.chart.renderer.category.StatisticalBarRenderer; import org.jfree.data.statistics.DefaultStatisticalCategoryDataset; import org.jfree.data.statistics.StatisticalCategoryDataset; import org.jfree.ui.ApplicationFrame; import org.jfree.ui.RefineryUtilities; /**

* Demonstration of the statistical bar graph.
*
* @author Pascal Collet
*/

public class StatisticalBarChartDemo extends ApplicationFrame {

   /**
    * Creates a new demo.
    *
    * @param title  the frame title.
    */
   public StatisticalBarChartDemo(final String title) {
       super(title);
       final StatisticalCategoryDataset dataset = createDataset();
       final CategoryAxis xAxis = new CategoryAxis("Type");
       xAxis.setLowerMargin(0.01d); // percentage of space before first bar
       xAxis.setUpperMargin(0.01d); // percentage of space after last bar
       xAxis.setCategoryMargin(0.05d); // percentage of space between categories
       final ValueAxis yAxis = new NumberAxis("Value");
       // define the plot
       final CategoryItemRenderer renderer = new StatisticalBarRenderer();
       final CategoryPlot plot = new CategoryPlot(dataset, xAxis, yAxis, renderer);
       final JFreeChart chart = new JFreeChart("Statistical Bar Chart Demo",
                                         new Font("Helvetica", Font.BOLD, 14),
                                         plot,
                                         true);
       //chart.setBackgroundPaint(Color.white);
       // add the chart to a panel...
       final ChartPanel chartPanel = new ChartPanel(chart);
       chartPanel.setPreferredSize(new java.awt.Dimension(500, 270));
       setContentPane(chartPanel);
   }
   // ****************************************************************************
   // * JFREECHART DEVELOPER GUIDE                                               *
   // * The JFreeChart Developer Guide, written by David Gilbert, is available   *
   // * to purchase from Object Refinery Limited:                                *
   // *                                                                          *
   // * http://www.object-refinery.ru/jfreechart/guide.html                     *
   // *                                                                          *
   // * Sales are used to provide funding for the JFreeChart project - please    * 
   // * support us so that we can continue developing free software.             *
   // ****************************************************************************
   
   /**
    * Creates a sample dataset.
    *
    * @return The dataset.
    */
   private StatisticalCategoryDataset createDataset() {
       final DefaultStatisticalCategoryDataset result = new DefaultStatisticalCategoryDataset();
       result.add(32.5, 17.9, "Series 1", "Type 1");
       result.add(27.8, 11.4, "Series 1", "Type 2");
       result.add(29.3, 14.4, "Series 1", "Type 3");
       result.add(37.9, 10.3, "Series 1", "Type 4");
       result.add(22.9,  7.9, "Series 2", "Type 1");
       result.add(21.8, 18.4, "Series 2", "Type 2");
       result.add(19.3, 12.4, "Series 2", "Type 3");
       result.add(30.3, 20.7, "Series 2", "Type 4");
       result.add(12.5, 10.9, "Series 3", "Type 1");
       result.add(24.8,  7.4, "Series 3", "Type 2");
       result.add(19.3, 13.4, "Series 3", "Type 3");
       result.add(17.1, 10.6, "Series 3", "Type 4");
       return result;
   }
   /**
    * For testing from the command line.
    *
    * @param args  ignored.
    */
   public static void main(final String[] args) {
       final StatisticalBarChartDemo demo = new StatisticalBarChartDemo(
           "Statistical Bar Chart Demo"
       );
       demo.pack();
       RefineryUtilities.centerFrameOnScreen(demo);
       demo.setVisible(true);
   }

}

      </source>