imagemapdemo2.java

JFreeChartweb图表

/* ======================================
 * 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.
 *
 * ------------------
 * ImageMapDemo2.java
 * ------------------
 * (C) Copyright 2002, 2003, by Object Refinery Limited and Contributors.
 *
 * Original Author:  David Gilbert (for Object Refinery Limited);
 * Contributor(s):   Richard Atkinson ([e-mail]);
 *
 * $Id: ImageMapDemo2.java,v 1.5 2003/08/20 11:43:46 mungady Exp $
 *
 * Changes
 * -------
 * 26-Jun-2002 : Version 1 (DG);
 * 05-Aug-2002 : Modified to demonstrate hrefs and alt tags in image map (RA);
 * 10-Oct-2002 : Fixed errors reported by Checkstyle (DG);
 *
 */

package org.jfree.chart.demo;

import java.awt.Insets;
import java.io.BufferedOutputStream;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.OutputStream;
import java.io.PrintWriter;

import org.jfree.chart.ChartFactory;
import org.jfree.chart.ChartRenderingInfo;
import org.jfree.chart.ChartUtilities;
import org.jfree.chart.JFreeChart;
import org.jfree.chart.entity.StandardEntityCollection;
import org.jfree.chart.labels.StandardPieItemLabelGenerator;
import org.jfree.chart.plot.PiePlot;
import org.jfree.chart.urls.StandardPieURLGenerator;
import org.jfree.data.DefaultPieDataset;

/**
 * Another demo showing how to create an HTML image map with JFreeChart.
 *
 * @author David Gilbert
 */
public class ImageMapDemo2 {

    /**
     * Default constructor.
     */
    public ImageMapDemo2() {
    }

    /**
     * The starting point for the demo.
     *
     * @param args  ignored.
     */
    public static void main(String[] args) {

        // create a chart
        DefaultPieDataset data = new DefaultPieDataset();
        data.setValue("One", new Double(43.2));
        data.setValue("Two", new Double(10.0));
        data.setValue("Three", new Double(27.5));
        data.setValue("Four", new Double(17.5));
        data.setValue("Five", new Double(11.0));
        data.setValue("Six", new Double(19.4));

        JFreeChart chart = null;
        boolean drilldown = true;

        // create the chart...
        if (drilldown) {
            PiePlot plot = new PiePlot(data);
            plot.setInsets(new Insets(0, 5, 5, 5));
            plot.setItemLabelGenerator(new StandardPieItemLabelGenerator());
            plot.setURLGenerator(new StandardPieURLGenerator("pie_chart_detail.jsp"));
            chart = new JFreeChart("Pie Chart Demo 1", JFreeChart.DEFAULT_TITLE_FONT, plot, true);
        }
        else {
            chart = ChartFactory.createPieChart("Pie Chart Demo 1",  // chart title
                                                data,                // data
                                                true,                // include legend
                                                true,
                                                false
                                                );
        }
        chart.setBackgroundPaint(java.awt.Color.white);

        // save it to an image
        try {
            ChartRenderingInfo info = new ChartRenderingInfo(new StandardEntityCollection());
            File file1 = new File("piechart100.png");
            ChartUtilities.saveChartAsPNG(file1, chart, 600, 400, info);

            // write an HTML page incorporating the image with an image map
            File file2 = new File("piechart100.html");
            OutputStream out = new BufferedOutputStream(new FileOutputStream(file2));
            PrintWriter writer = new PrintWriter(out);
            writer.println("<HTML>");
            writer.println("<HEAD><TITLE>JFreeChart Image Map Demo 2</TITLE></HEAD>");
            writer.println("<BODY>");
            ChartUtilities.writeImageMap(writer, "chart", info);
            writer.println("<IMG SRC=\"piechart100.png\" "
                           + "WIDTH=\"600\" HEIGHT=\"400\" BORDER=\"0\" USEMAP=\"#chart\">");
            writer.println("</BODY>");
            writer.println("</HTML>");
            writer.close();

        }
        catch (IOException e) {
            System.out.println(e.toString());
        }

    }

}