piechartdemo4.java

JfreeChart 常用图表例子

/* ===========================================================
 * 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.]
 *
 * ------------------
 * PieChartDemo4.java
 * ------------------
 * (C) Copyright 2003, 2004, by Object Refinery Limited and Contributors.
 *
 * Original Author:  David Gilbert (for Object Refinery Limited);
 * Contributor(s):   -;
 *
 * $Id: PieChartDemo4.java,v 1.21 2004/06/03 15:05:10 mungady Exp $
 *
 * Changes
 * -------
 * 11-Feb-2003 : Version 1 (DG);
 *
 */

package org.jfree.chart.demo;

import java.awt.Color;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.text.NumberFormat;

import javax.swing.Timer;

import org.jfree.chart.ChartFactory;
import org.jfree.chart.ChartPanel;
import org.jfree.chart.JFreeChart;
import org.jfree.chart.labels.StandardPieItemLabelGenerator;
import org.jfree.chart.plot.PiePlot;
import org.jfree.data.general.DefaultPieDataset;
import org.jfree.data.general.PieDataset;
import org.jfree.ui.ApplicationFrame;
import org.jfree.ui.RefineryUtilities;
import org.jfree.util.Log;
import org.jfree.util.PrintStreamLogTarget;

/**
 * A simple demonstration application showing how to create a pie chart using data from a
 * {@link DefaultPieDataset}.  This chart has a lot of labels and rotates, so it is useful for
 * testing the label distribution algorithm.
 */
public class PieChartDemo4 extends ApplicationFrame {

    /**
     * Default constructor.
     *
     * @param title  the frame title.
     */
    public PieChartDemo4(final String title) {

        super(title);
        final PieDataset dataset = createDataset(14);

        // create the chart...
        final JFreeChart chart = ChartFactory.createPieChart(
            "Pie Chart Demo 4",  // chart title
            dataset,             // dataset
            false,               // include legend
            true,
            false
        );

        // set the background color for the chart...
        chart.setBackgroundPaint(new Color(222, 222, 255));
        final PiePlot plot = (PiePlot) chart.getPlot();
        plot.setBackgroundPaint(Color.white);
        plot.setCircular(true);
        plot.setLabelGenerator(new StandardPieItemLabelGenerator(
            "{0} = {2}", NumberFormat.getNumberInstance(), NumberFormat.getPercentInstance()
        ));
        plot.setNoDataMessage("No data available");

        // add the chart to a panel...
        final ChartPanel chartPanel = new ChartPanel(chart);
        chartPanel.setPreferredSize(new java.awt.Dimension(500, 270));
        setContentPane(chartPanel);
        
        final Rotator rotator = new Rotator(plot);
        rotator.start();

    }

    /**
     * Creates a sample dataset.
     * 
     * @param sections  the number of sections.
     * 
     * @return A sample dataset.
     */
    private PieDataset createDataset(final int sections) {
        final DefaultPieDataset result = new DefaultPieDataset();
        for (int i = 0; i < sections; i++) {
            final double value = 100.0 * Math.random();
            result.setValue("Section " + i, value);
        }
        return result;
    }
    
    // ****************************************************************************
    // * JFREECHART DEVELOPER GUIDE                                               *
    // * The JFreeChart Developer Guide, written by David Gilbert, is available   *
    // * to purchase from Object Refinery Limited:                                *
    // *                                                                          *
    // * http://www.object-refinery.com/jfreechart/guide.html                     *
    // *                                                                          *
    // * Sales are used to provide funding for the JFreeChart project - please    * 
    // * support us so that we can continue developing free software.             *
    // ****************************************************************************
    
    /**
     * Starting point for the demonstration application.
     *
     * @param args  ignored.
     */
    public static void main(final String[] args) {

        Log.getInstance().addTarget(new PrintStreamLogTarget());
        final PieChartDemo4 demo = new PieChartDemo4("Pie Chart Demo 4");
        demo.pack();
        RefineryUtilities.centerFrameOnScreen(demo);
        demo.setVisible(true);

    }

    /**
     * The rotator.
     *
     */
    static class Rotator extends Timer implements ActionListener {

        /** The plot. */
        private PiePlot plot;

        /** The angle. */
        private int angle = 270;

        /**
         * Constructor.
         *
         * @param plot  the plot.
         */
        Rotator(final PiePlot plot) {
            super(100, null);
            this.plot = plot;
            addActionListener(this);
        }

        /**
         * Modifies the starting angle.
         *
         * @param event  the action event.
         */
        public void actionPerformed(final ActionEvent event) {
            this.plot.setStartAngle(angle);
            this.angle = this.angle + 1;
            if (this.angle == 360) {
                this.angle = 0;
            }
        }

    }

}