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.] * * ----------------------------- * CategoryStepRendererDemo.java * ----------------------------- * (C) Copyright 2004, by Object Refinery Limited and Contributors. * * Original Author: David Gilbert (for Object Refinery Limited); * Contributor(s): -; * * $Id: CategoryStepChartDemo.java,v 1.2 2004/04/26 19:11:53 taqua Exp $ * * Changes * ------- * 21-Apr-2004 : Version 1 (DG); * */ package org.jfree.chart.demo; import java.awt.Color; import java.awt.Dimension; import org.jfree.chart.ChartPanel; 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.axis.ValueAxis; import org.jfree.chart.plot.CategoryPlot; import org.jfree.chart.renderer.category.CategoryItemRenderer; import org.jfree.chart.renderer.category.CategoryStepRenderer; import org.jfree.data.category.CategoryDataset; import org.jfree.data.general.DatasetUtilities; import org.jfree.ui.ApplicationFrame; import org.jfree.ui.RefineryUtilities; import org.jfree.ui.Spacer; /** * A simple demonstration application showing how to create an area chart using data from a * {@link CategoryDataset}. * */ public class CategoryStepChartDemo extends ApplicationFrame { /** * Creates a new demo application. * * @param title the frame title. */ public CategoryStepChartDemo(final String title) { super(title); // create a dataset... final double[][] data = new double[][] { { 1.0, 4.0, 3.0, 5.0, 5.0, 7.0, 7.0, 8.0 }, { 5.0, 7.0, 6.0, 8.0, 4.0, 4.0, 2.0, 1.0 }, { 4.0, 3.0, 2.0, 3.0, 6.0, 3.0, 4.0, 3.0 } }; final CategoryDataset dataset = DatasetUtilities.createCategoryDataset("Series ", "Type ", data); // create the chart... final JFreeChart chart = createChart(dataset); final ChartPanel chartPanel = new ChartPanel(chart); chartPanel.setPreferredSize(new Dimension(500, 270)); chartPanel.setEnforceFileExtensions(false); 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 chart. * * @param dataset the dataset. * * @return The chart. */ private JFreeChart createChart(final CategoryDataset dataset) { final CategoryItemRenderer renderer = new CategoryStepRenderer(true); final CategoryAxis domainAxis = new CategoryAxis("Category"); final ValueAxis rangeAxis = new NumberAxis("Value"); final CategoryPlot plot = new CategoryPlot(dataset, domainAxis, rangeAxis, renderer); final JFreeChart chart = new JFreeChart("Category Step Chart", plot); // 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); // 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); domainAxis.setCategoryLabelPositions(CategoryLabelPositions.UP_45); domainAxis.setLowerMargin(0.0); domainAxis.setUpperMargin(0.0); domainAxis.addCategoryLabelToolTip("Type 1", "The first type."); domainAxis.addCategoryLabelToolTip("Type 2", "The second type."); domainAxis.addCategoryLabelToolTip("Type 3", "The third type."); rangeAxis.setStandardTickUnits(NumberAxis.createIntegerTickUnits()); rangeAxis.setLabelAngle(0 * Math.PI / 2.0); // OPTIONAL CUSTOMISATION COMPLETED. return chart; } /** * Starting point for the demonstration application. * * @param args ignored. */ public static void main(final String[] args) { final CategoryStepChartDemo demo = new CategoryStepChartDemo("Category Step Renderer Demo"); demo.pack(); RefineryUtilities.centerFrameOnScreen(demo); demo.setVisible(true); } }