boxandwhiskerdemo.java

Web图形化的Java库

/* ======================================
 * JFreeChart : a free Java chart library
 * ======================================
 *
 * Project Info:  http://www.jfree.org/jfreechart/index.html
 * Project Lead:  David Gilbert ([e-mail]);
 *
 * (C) Copyright 2000-2003, by Object Refinery Limited and Contributors.
 *
 * 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.
 *
 * ----------------------
 * BoxAndWhiskerDemo.java
 * ----------------------
 * (C) Copyright 2003, by David Browning and Contributors.
 *
 * Original Author:  David Browning (for the Australian Institute of Marine Science);
 * Contributor(s):   David Gilbert (for Object Refinery Limited);
 *
 * $Id: BoxAndWhiskerDemo.java,v 1.2 2003/09/01 10:10:42 mungady Exp $
 *
 * Changes
 * -------
 * 21-Aug-2003 : Version 1, contributed by David Browning (for the Australian Institute of 
 *               Marine Science);
 * 27-Aug-2003 : Renamed BoxAndWhiskerCategoryDemo --> BoxAndWhiskerDemo, moved dataset creation
 *               into the demo (DG);
 *
 */

package org.jfree.chart.demo;

import java.awt.Font;
import java.util.ArrayList;
import java.util.List;

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.plot.CategoryPlot;
import org.jfree.chart.renderer.BoxAndWhiskerRenderer;
import org.jfree.data.statistics.BoxAndWhiskerCategoryDataset;
import org.jfree.data.statistics.DefaultBoxAndWhiskerCategoryDataset;
import org.jfree.ui.ApplicationFrame;
import org.jfree.ui.RefineryUtilities;

/**
 * Demonstration of a box-and-whisker chart using a {@link CategoryPlot}.
 *
 * @author David Browning
 */
public class BoxAndWhiskerDemo extends ApplicationFrame {

    /**
     * Creates a new demo.
     *
     * @param title  the frame title.
     */
    public BoxAndWhiskerDemo(String title) {

        super(title);
        
        BoxAndWhiskerCategoryDataset dataset = createSampleDataset();

        CategoryAxis xAxis = new CategoryAxis("Type");
        NumberAxis yAxis = new NumberAxis("Value");
        yAxis.setAutoRangeIncludesZero(false);
        BoxAndWhiskerRenderer renderer = new BoxAndWhiskerRenderer();
        CategoryPlot plot = new CategoryPlot(dataset, xAxis, yAxis, renderer);

        JFreeChart chart = new JFreeChart(
            "Box-and-Whisker Demo",
            new Font("SansSerif", Font.BOLD, 14),
            plot,
            true
        );
        
        ChartPanel chartPanel = new ChartPanel(chart);
        chartPanel.setPreferredSize(new java.awt.Dimension(450, 270));
        setContentPane(chartPanel);

    }

    /**
     * Creates a sample dataset.
     * 
     * @return A sample dataset.
     */
    private BoxAndWhiskerCategoryDataset createSampleDataset() {
        
        final int SERIES_COUNT = 3;
        final int CATEGORY_COUNT = 4;
        final int ENTITY_COUNT = 22;
        
        DefaultBoxAndWhiskerCategoryDataset dataset = new DefaultBoxAndWhiskerCategoryDataset();
        for (int i = 0; i < SERIES_COUNT; i++) {
            for (int j = 0; j < CATEGORY_COUNT; j++) {
                List list = new ArrayList();
                // add some values...
                for (int k = 0; k < ENTITY_COUNT; k++) {
                    double value1 = 10.0 + Math.random() * 3;
                    list.add(new Double(value1));
                    double value2 = 11.25 + Math.random();  // concentrate values in the middle
                    list.add(new Double(value2));
                }
                dataset.add(list, "Series " + i, " Type " + j);
            }
        }

        return dataset;
    }


    /**
     * For testing from the command line.
     *
     * @param args  ignored.
     */
    public static void main(String[] args) {

        BoxAndWhiskerDemo demo = new BoxAndWhiskerDemo("Box-and-Whisker Chart Demo");
        demo.pack();
        RefineryUtilities.centerFrameOnScreen(demo);
        demo.setVisible(true);

    }

}