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.] * * ---------------------- * CompassFormatDemo.java * ---------------------- * (C) Copyright 2004, by Object Refinery Limited and Contributors. * * Original Author: David Gilbert (for Object Refinery Limited); * Contributor(s): -; * * $Id: CompassFormatDemo.java,v 1.4 2004/04/27 14:53:09 mungady Exp $ * * Changes * ------- * 18-Feb-2004 : Version 1 (DG); * */ package org.jfree.chart.demo; import java.awt.Color; import org.jfree.chart.ChartFactory; import org.jfree.chart.ChartPanel; import org.jfree.chart.JFreeChart; import org.jfree.chart.axis.CompassFormat; import org.jfree.chart.axis.NumberAxis; import org.jfree.chart.axis.NumberTickUnit; import org.jfree.chart.axis.TickUnits; import org.jfree.chart.axis.ValueAxis; import org.jfree.chart.plot.XYPlot; import org.jfree.chart.renderer.xy.XYAreaRenderer; import org.jfree.chart.renderer.xy.XYItemRenderer; import org.jfree.data.time.Minute; import org.jfree.data.time.RegularTimePeriod; import org.jfree.data.time.TimeSeries; import org.jfree.data.time.TimeSeriesCollection; import org.jfree.data.xy.XYDataset; import org.jfree.ui.ApplicationFrame; import org.jfree.ui.RefineryUtilities; /** * A demo of the {@link CompassFormat} class. * */ public class CompassFormatDemo extends ApplicationFrame { /** * Creates a new demo instance. * * @param title the frame title. */ public CompassFormatDemo(final String title) { super(title); final JFreeChart chart = createChart(); 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. * * @param count the item count. * * @return the dataset. */ private XYDataset createDirectionDataset(final int count) { final TimeSeriesCollection dataset = new TimeSeriesCollection(); final TimeSeries s1 = new TimeSeries("Wind Direction", Minute.class); RegularTimePeriod start = new Minute(); double direction = 180.0; for (int i = 0; i < count; i++) { s1.add(start, direction); start = start.next(); direction = direction + (Math.random() - 0.5) * 15.0; if (direction < 0.0) { direction = direction + 360.0; } else if (direction > 360.0) { direction = direction - 360.0; } } dataset.addSeries(s1); return dataset; } /** * Creates a sample dataset. * * @param count the item count. * * @return the dataset. */ private XYDataset createForceDataset(final int count) { final TimeSeriesCollection dataset = new TimeSeriesCollection(); final TimeSeries s1 = new TimeSeries("Wind Force", Minute.class); RegularTimePeriod start = new Minute(); double force = 3.0; for (int i = 0; i < count; i++) { s1.add(start, force); start = start.next(); force = Math.max(0.5, force + (Math.random() - 0.5) * 0.5); } dataset.addSeries(s1); return dataset; } /** * Creates a sample chart. * * @return a sample chart. */ private JFreeChart createChart() { final XYDataset direction = createDirectionDataset(600); final JFreeChart chart = ChartFactory.createTimeSeriesChart("Time", "Date", "Direction", direction, true, true, false); final XYPlot plot = chart.getXYPlot(); plot.getDomainAxis().setLowerMargin(0.0); plot.getDomainAxis().setUpperMargin(0.0); // configure the range axis to display directions... final NumberAxis rangeAxis = (NumberAxis) plot.getRangeAxis(); rangeAxis.setAutoRangeIncludesZero(false); final TickUnits units = new TickUnits(); units.add(new NumberTickUnit(180.0, new CompassFormat())); units.add(new NumberTickUnit(90.0, new CompassFormat())); units.add(new NumberTickUnit(45.0, new CompassFormat())); units.add(new NumberTickUnit(22.5, new CompassFormat())); rangeAxis.setStandardTickUnits(units); // add the wind force with a secondary dataset/renderer/axis plot.setRangeAxis(rangeAxis); final XYItemRenderer renderer2 = new XYAreaRenderer(); final ValueAxis axis2 = new NumberAxis("Force"); axis2.setRange(0.0, 12.0); renderer2.setSeriesPaint(0, new Color(0, 0, 255, 128)); plot.setDataset(1, createForceDataset(600)); plot.setRenderer(1, renderer2); plot.setRangeAxis(1, axis2); plot.mapDatasetToRangeAxis(1, 1); return chart; } /** * Starting point for the demonstration application. * * @param args ignored. */ public static void main(final String[] args) { final CompassFormatDemo demo = new CompassFormatDemo("Compass Format Demo"); demo.pack(); RefineryUtilities.centerFrameOnScreen(demo); demo.setVisible(true); } }