piechartdemo4.java

很好的制作统计图表的代码

// Decompiled by DJ v3.7.7.81 Copyright 2004 Atanas Neshkov  Date: 7/18/2005 5:13:53 PM
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// Decompiler options: packimports(3) 

package org.jfree.chart.demo;

import java.awt.Color;
import java.awt.Dimension;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.text.NumberFormat;
import javax.swing.Timer;
import org.jfree.chart.*;
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;

public class PieChartDemo4 extends ApplicationFrame
{
    static class Rotator extends Timer
        implements ActionListener
    {

        public void actionPerformed(ActionEvent actionevent)
        {
            plot.setStartAngle(angle);
            angle = angle + 1;
            if(angle == 360)
                angle = 0;
        }

        private PiePlot plot;
        private int angle;

        Rotator(PiePlot pieplot)
        {
            super(100, null);
            angle = 270;
            plot = pieplot;
            addActionListener(this);
        }
    }


    public PieChartDemo4(String s)
    {
        super(s);
        PieDataset piedataset = createDataset(14);
        JFreeChart jfreechart = ChartFactory.createPieChart("Pie Chart Demo 4", piedataset, false, true, false);
        jfreechart.setBackgroundPaint(new Color(222, 222, 255));
        PiePlot pieplot = (PiePlot)jfreechart.getPlot();
        pieplot.setBackgroundPaint(Color.white);
        pieplot.setCircular(true);
        pieplot.setLabelGenerator(new StandardPieItemLabelGenerator("{0} = {2}", NumberFormat.getNumberInstance(), NumberFormat.getPercentInstance()));
        pieplot.setNoDataMessage("No data available");
        ChartPanel chartpanel = new ChartPanel(jfreechart);
        chartpanel.setPreferredSize(new Dimension(500, 270));
        setContentPane(chartpanel);
        Rotator rotator = new Rotator(pieplot);
        rotator.start();
    }

    private PieDataset createDataset(int i)
    {
        DefaultPieDataset defaultpiedataset = new DefaultPieDataset();
        for(int j = 0; j < i; j++)
        {
            double d = 100D * Math.random();
            defaultpiedataset.setValue("Section " + j, d);
        }

        return defaultpiedataset;
    }

    public static void main(String args[])
    {
        Log.getInstance().addTarget(new PrintStreamLogTarget());
        PieChartDemo4 piechartdemo4 = new PieChartDemo4("Pie Chart Demo 4");
        piechartdemo4.pack();
        RefineryUtilities.centerFrameOnScreen(piechartdemo4);
        piechartdemo4.setVisible(true);
    }
}