Java tutorial
/* =========================================================== * 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.] * * ------------------ * ImageMapDemo6.java * ------------------ * (C) Copyright 2004, by Object Refinery Limited and Contributors. * * Original Author: David Gilbert (for Object Refinery Limited); * Contributor(s): -; * * $Id: ImageMapDemo6.java,v 1.2 2004/04/26 19:11:55 taqua Exp $ * * Changes * ------- * 31-Mar-2004 : Version 1 (DG); * */ package org.jfree.chart.demo; import java.awt.Font; 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.MultiplePiePlot; import org.jfree.chart.plot.PiePlot; import org.jfree.data.category.CategoryDataset; import org.jfree.data.general.DatasetUtilities; import org.jfree.util.TableOrder; /** * Creates an HTML image map for a multiple pie chart. */ public class ImageMapDemo6 { /** * Default constructor. */ public ImageMapDemo6() { super(); } /** * Saves the chart image and HTML. */ public void saveImageAndHTML() { final CategoryDataset dataset = createDataset(); final JFreeChart chart = createChart(dataset); // **************************************************************************** // * 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. * // **************************************************************************** // save it to an image try { final ChartRenderingInfo info = new ChartRenderingInfo(new StandardEntityCollection()); final File file1 = new File("multipiechart100.png"); ChartUtilities.saveChartAsPNG(file1, chart, 600, 400, info); // write an HTML page incorporating the image with an image map final File file2 = new File("multipiechart100.html"); final OutputStream out = new BufferedOutputStream(new FileOutputStream(file2)); final PrintWriter writer = new PrintWriter(out); writer.println("<HTML>"); writer.println("<HEAD><TITLE>JFreeChart Image Map Demo</TITLE></HEAD>"); writer.println("<BODY>"); // ChartUtilities.writeImageMap(writer, "chart", info); writer.println("<IMG SRC=\"multipiechart100.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()); } } /** * Creates a sample dataset. * * @return A sample dataset. */ private CategoryDataset createDataset() { final double[][] data = new double[][] { { 3.0, 4.0, 3.0, 5.0 }, { 5.0, 7.0, 6.0, 8.0 }, { 5.0, 7.0, 3.0, 8.0 }, { 1.0, 2.0, 3.0, 4.0 }, { 2.0, 3.0, 2.0, 3.0 } }; final CategoryDataset dataset = DatasetUtilities.createCategoryDataset("Region ", "Sales/Q", data); return dataset; } /** * Creates a sample chart with the given dataset. * * @param dataset the dataset. * * @return A sample chart. */ private JFreeChart createChart(final CategoryDataset dataset) { final JFreeChart chart = ChartFactory.createMultiplePieChart("Multiple Pie Chart", // chart title dataset, // dataset TableOrder.BY_ROW, true, // include legend true, true); final MultiplePiePlot plot = (MultiplePiePlot) chart.getPlot(); final JFreeChart subchart = plot.getPieChart(); final PiePlot p = (PiePlot) subchart.getPlot(); p.setLabelGenerator(new StandardPieItemLabelGenerator("{0}")); p.setLabelFont(new Font("SansSerif", Font.PLAIN, 8)); p.setInteriorGap(0.30); return chart; } /** * Starting point for the demo. * * @param args ignored. */ public static void main(final String[] args) { final ImageMapDemo6 demo = new ImageMapDemo6(); demo.saveImageAndHTML(); } }