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.] * * ------------------ * ImageMapDemo5.java * ------------------ * (C) Copyright 2004, by Object Refinery Limited and Contributors. * * Original Author: David Gilbert (for Object Refinery Limited); * Contributor(s): -; * * $Id: ImageMapDemo5.java,v 1.7 2004/04/30 08:09:44 mungady Exp $ * * Changes * ------- * 22-Jan-2004 : Version 1 (DG); * */ package org.jfree.chart.demo; import java.awt.Color; 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.axis.CategoryAxis; import org.jfree.chart.axis.CategoryLabelPositions; import org.jfree.chart.axis.NumberAxis; import org.jfree.chart.entity.StandardEntityCollection; import org.jfree.chart.plot.CategoryPlot; import org.jfree.chart.plot.PlotOrientation; import org.jfree.chart.title.TextTitle; import org.jfree.data.category.CategoryDataset; import org.jfree.data.general.DatasetUtilities; import org.jfree.ui.RectangleEdge; import org.jfree.ui.Spacer; import org.jfree.ui.VerticalAlignment; /** * Creates an HTML image map for an area chart. This demo was put together as a test for * bug report 815817. * */ public class ImageMapDemo5 { /** * Default constructor. */ public ImageMapDemo5() { super(); } /** * Saves the chart image and HTML. */ public void saveImageAndHTML() { // create a dataset 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); 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("areachart100.png"); ChartUtilities.saveChartAsPNG(file1, chart, 600, 400, info); // write an HTML page incorporating the image with an image map final File file2 = new File("areachart100.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=\"areachart100.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 chart. * * @param dataset the dataset. * * @return The chart. */ private JFreeChart createChart(final CategoryDataset dataset) { final JFreeChart chart = ChartFactory.createAreaChart("Area Chart", // chart title "Category", // domain axis label "Value", // range axis label dataset, // data PlotOrientation.VERTICAL, // orientation true, // include legend true, // tooltips false // urls ); // NOW DO SOME OPTIONAL CUSTOMISATION OF THE CHART... // set the background color for the chart... // final StandardLegend legend = (StandardLegend) chart.getLegend(); // legend.setAnchor(StandardLegend.SOUTH); chart.setBackgroundPaint(Color.white); final TextTitle subtitle = new TextTitle("An area chart demonstration. We use this subtitle " + " as an example of what happens when you get a really long title or subtitle."); subtitle.setFont(new Font("SansSerif", Font.PLAIN, 12)); subtitle.setPosition(RectangleEdge.TOP); // subtitle.setSpacer(new Spacer(Spacer.RELATIVE, 0.05, 0.05, 0.05, 0.05)); subtitle.setVerticalAlignment(VerticalAlignment.BOTTOM); chart.addSubtitle(subtitle); final CategoryPlot plot = chart.getCategoryPlot(); plot.setForegroundAlpha(0.5f); // plot.setAxisOffset(new Spacer(Spacer.ABSOLUTE, 5.0, 5.0, 5.0, 5.0)); plot.setBackgroundPaint(Color.lightGray); plot.setDomainGridlinesVisible(true); plot.setDomainGridlinePaint(Color.white); plot.setRangeGridlinesVisible(true); plot.setRangeGridlinePaint(Color.white); final CategoryAxis domainAxis = plot.getDomainAxis(); domainAxis.setCategoryLabelPositions(CategoryLabelPositions.UP_45); domainAxis.setLowerMargin(0.0); domainAxis.setUpperMargin(0.0); final NumberAxis rangeAxis = (NumberAxis) plot.getRangeAxis(); rangeAxis.setStandardTickUnits(NumberAxis.createIntegerTickUnits()); rangeAxis.setLabelAngle(0 * Math.PI / 2.0); // OPTIONAL CUSTOMISATION COMPLETED. return chart; } /** * Starting point for the demo. * * @param args ignored. */ public static void main(final String[] args) { final ImageMapDemo5 demo = new ImageMapDemo5(); demo.saveImageAndHTML(); } }