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.] * * ------------------ * DualAxisDemo5.java * ------------------ * (C) Copyright 2002-2004, by Object Refinery Limited and Contributors. * * Original Author: David Gilbert (for Object Refinery Limited); * Contributor(s): -; * * $Id: DualAxisDemo5.java,v 1.12 2004/04/29 07:54:56 mungady Exp $ * * Changes * ------- * 19-Sep-2003 : Version 1 (DG); * 06-Feb-2004 : Modified to correct legend (DG); * */ package org.jfree.chart.demo; import java.awt.Color; import org.jfree.chart.ChartPanel; import org.jfree.chart.JFreeChart; import org.jfree.chart.LegendItem; import org.jfree.chart.LegendItemCollection; import org.jfree.chart.axis.AxisLocation; import org.jfree.chart.axis.CategoryAxis; import org.jfree.chart.axis.NumberAxis; import org.jfree.chart.axis.ValueAxis; import org.jfree.chart.plot.CategoryPlot; import org.jfree.chart.renderer.category.BarRenderer; import org.jfree.chart.renderer.category.CategoryItemRenderer; import org.jfree.data.category.CategoryDataset; import org.jfree.data.category.DefaultCategoryDataset; import org.jfree.ui.ApplicationFrame; import org.jfree.ui.RefineryUtilities; /** * This demo shows how to create a dual axis bar chart. A workaround is used because the * {@link BarRenderer} and {@link CategoryAxis} classes will overlap the bars for the two * datasets - to get around this, an an additional series (containing 'null' values) is added * to each dataset, and the getLegendItems() method in the plot is overridden. * */ public class DualAxisDemo5 extends ApplicationFrame { /** * Creates a new demo instance. * * @param title the frame title. */ public DualAxisDemo5(final String title) { super(title); final CategoryDataset dataset1 = createDataset1(); final CategoryDataset dataset2 = createDataset2(); final JFreeChart chart = createChart(dataset1, dataset2); final ChartPanel chartPanel = new ChartPanel(chart); chartPanel.setPreferredSize(new java.awt.Dimension(500, 270)); setContentPane(chartPanel); } // **************************************************************************** // * 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. * // **************************************************************************** /** * Creates a sample dataset. * * @return The dataset. */ private CategoryDataset createDataset1() { // row keys... final String series1 = "Series 1"; final String series2 = "Dummy 1"; // column keys... final String category1 = "Category 1"; final String category2 = "Category 2"; final String category3 = "Category 3"; final String category4 = "Category 4"; // create the dataset... final DefaultCategoryDataset dataset = new DefaultCategoryDataset(); dataset.addValue(1.0, series1, category1); dataset.addValue(4.0, series1, category2); dataset.addValue(3.0, series1, category3); dataset.addValue(5.0, series1, category4); dataset.addValue(null, series2, category1); dataset.addValue(null, series2, category2); dataset.addValue(null, series2, category3); dataset.addValue(null, series2, category4); return dataset; } /** * Creates a sample dataset. * * @return The dataset. */ private CategoryDataset createDataset2() { // row keys... final String series1 = "Dummy 2"; final String series2 = "Series 2"; // column keys... final String category1 = "Category 1"; final String category2 = "Category 2"; final String category3 = "Category 3"; final String category4 = "Category 4"; // create the dataset... final DefaultCategoryDataset dataset = new DefaultCategoryDataset(); dataset.addValue(null, series1, category1); dataset.addValue(null, series1, category2); dataset.addValue(null, series1, category3); dataset.addValue(null, series1, category4); dataset.addValue(75.0, series2, category1); dataset.addValue(87.0, series2, category2); dataset.addValue(96.0, series2, category3); dataset.addValue(68.0, series2, category4); return dataset; } /** * Creates a chart. * * @param dataset1 the first dataset. * @param dataset2 the second dataset. * * @return A chart. */ private JFreeChart createChart(final CategoryDataset dataset1, final CategoryDataset dataset2) { final CategoryAxis domainAxis = new CategoryAxis("Category"); final NumberAxis rangeAxis = new NumberAxis("Value"); final BarRenderer renderer1 = new BarRenderer(); final CategoryPlot plot = new CategoryPlot(dataset1, domainAxis, rangeAxis, renderer1) { /** * Override the getLegendItems() method to handle special case. * * @return the legend items. */ public LegendItemCollection getLegendItems() { final LegendItemCollection result = new LegendItemCollection(); final CategoryDataset data = getDataset(); if (data != null) { final CategoryItemRenderer r = getRenderer(); if (r != null) { final LegendItem item = r.getLegendItem(0, 0); result.add(item); } } // the JDK 1.2.2 compiler complained about the name of this // variable final CategoryDataset dset2 = getDataset(1); if (dset2 != null) { final CategoryItemRenderer renderer2 = getRenderer(1); if (renderer2 != null) { final LegendItem item = renderer2.getLegendItem(1, 1); result.add(item); } } return result; } }; final JFreeChart chart = new JFreeChart("Dual Axis Bar Chart", plot); chart.setBackgroundPaint(Color.white); // chart.getLegend().setAnchor(Legend.SOUTH); plot.setBackgroundPaint(new Color(0xEE, 0xEE, 0xFF)); plot.setDomainAxisLocation(AxisLocation.BOTTOM_OR_RIGHT); plot.setDataset(1, dataset2); plot.mapDatasetToRangeAxis(1, 1); final ValueAxis axis2 = new NumberAxis("Secondary"); plot.setRangeAxis(1, axis2); plot.setRangeAxisLocation(1, AxisLocation.BOTTOM_OR_RIGHT); final BarRenderer renderer2 = new BarRenderer(); plot.setRenderer(1, renderer2); return chart; } /** * Starting point for the demonstration application. * * @param args ignored. */ public static void main(final String[] args) { final DualAxisDemo5 demo = new DualAxisDemo5("Dual Axis Demo 5"); demo.pack(); RefineryUtilities.centerFrameOnScreen(demo); demo.setVisible(true); } }