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.] * * ------------------ * ImageMapDemo1.java * ------------------ * (C) Copyright 2002-2004, by Object Refinery Limited and Contributors. * * Original Author: David Gilbert (for Object Refinery Limited); * Contributor(s): Richard Atkinson (richard_c_atkinson@ntlworld.com); * * $Id: ImageMapDemo1.java,v 1.26 2004/05/10 16:45:23 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.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.axis.CategoryAxis; import org.jfree.chart.axis.NumberAxis; import org.jfree.chart.axis.ValueAxis; import org.jfree.chart.entity.StandardEntityCollection; import org.jfree.chart.labels.StandardCategoryToolTipGenerator; import org.jfree.chart.plot.CategoryPlot; import org.jfree.chart.plot.PlotOrientation; import org.jfree.chart.renderer.category.BarRenderer; import org.jfree.chart.urls.StandardCategoryURLGenerator; import org.jfree.data.category.CategoryDataset; import org.jfree.data.general.DatasetUtilities; /** * A demo showing how to create an HTML image map for a bar chart. */ public class ImageMapDemo1 { /** * Default constructor. */ public ImageMapDemo1() { super(); } /** * Starting point for the demo. * * @param args ignored. */ public static void main(final String[] args) { // create a chart final double[][] data = new double[][] { { 56.0, -12.0, 34.0, 76.0, 56.0, 100.0, 67.0, 45.0 }, { 37.0, 45.0, 67.0, 25.0, 34.0, 34.0, 100.0, 53.0 }, { 43.0, 54.0, 34.0, 34.0, 87.0, 64.0, 73.0, 12.0 } }; final CategoryDataset dataset = DatasetUtilities.createCategoryDataset("Series ", "Type ", data); JFreeChart chart = null; final boolean drilldown = true; if (drilldown) { final CategoryAxis categoryAxis = new CategoryAxis("Category"); final ValueAxis valueAxis = new NumberAxis("Value"); final BarRenderer renderer = new BarRenderer(); renderer.setToolTipGenerator(new StandardCategoryToolTipGenerator()); renderer.setItemURLGenerator(new StandardCategoryURLGenerator("bar_chart_detail.jsp")); final CategoryPlot plot = new CategoryPlot(dataset, categoryAxis, valueAxis, renderer); plot.setOrientation(PlotOrientation.VERTICAL); chart = new JFreeChart("Bar Chart", JFreeChart.DEFAULT_TITLE_FONT, plot, true); } else { chart = ChartFactory.createBarChart("Vertical Bar Chart", // chart title "Category", // domain axis label "Value", // range axis label dataset, // data PlotOrientation.VERTICAL, true, // include legend true, false); } chart.setBackgroundPaint(java.awt.Color.white); // **************************************************************************** // * 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("barchart100.png"); ChartUtilities.saveChartAsPNG(file1, chart, 600, 400, info); // write an HTML page incorporating the image with an image map final File file2 = new File("barchart100.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=\"barchart100.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()); } } }