3D效果的饼图
今天给大家一个由JFreeChart组件实现的3D效果的饼图，同时自己也收藏一下。代码如下：

package com.gxa.edu.test;import org.jfree.chart.ChartFactory;import org.jfree.chart.ChartPanel;import org.jfree.chart.JFreeChart;import org.jfree.chart.plot.PiePlot3D;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.Rotation;/** * A simple demonstration application showing how to create a pie chart using data from a * {@link DefaultPieDataset}. * */public class PieChart3DDemo1 extends ApplicationFrame {    /**     * Creates a new demo.     *     * @param title  the frame title.     */    public PieChart3DDemo1(final String title) {        super(title);        // create a dataset...        final PieDataset dataset = createSampleDataset();                // create the chart...        final JFreeChart chart = createChart(dataset);                // add the chart to a panel...        final ChartPanel chartPanel = new ChartPanel(chart);        chartPanel.setPreferredSize(new java.awt.Dimension(500, 270));        setContentPane(chartPanel);    }        /**     * Creates a sample dataset for the demo.     *      * @return A sample dataset.     */    private PieDataset createSampleDataset() {                final DefaultPieDataset result = new DefaultPieDataset();        result.setValue("Java", new Double(43.2));        result.setValue("Visual Basic", new Double(10.0));        result.setValue("C/C++", new Double(17.5));        result.setValue("PHP", new Double(32.5));        result.setValue("Perl", new Double(1.0));        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.             *    // ****************************************************************************        /**     * Creates a sample chart.     *      * @param dataset  the dataset.     *      * @return A chart.     */    private JFreeChart createChart(final PieDataset dataset) {                final JFreeChart chart = ChartFactory.createPieChart3D(            "Pie Chart 3D Demo 1",  // chart title            dataset,                // data            true,                   // include legend            true,            false        );        final PiePlot3D plot = (PiePlot3D) chart.getPlot();        plot.setStartAngle(290);        plot.setDirection(Rotation.CLOCKWISE);        plot.setForegroundAlpha(0.5f);        plot.setNoDataMessage("No data to display");        return chart;            }        /**     * Starting point for the demonstration application.     *     * @param args  ignored.     */    public static void main(final String[] args) {        final PieChart3DDemo1 demo = new PieChart3DDemo1("Pie Chart 3D Demo 1");        demo.pack();        RefineryUtilities.centerFrameOnScreen(demo);        demo.setVisible(true);    }}