Java tutorial
package com.experiments; /* =========================================================== * 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.] * * -------------------- * DynamicDataDemo.java * -------------------- * (C) Copyright 2002-2004, by Object Refinery Limited. * * Original Author: David Gilbert (for Object Refinery Limited). * Contributor(s): -; * * $Id: DynamicDataDemo.java,v 1.12 2004/05/07 16:09:03 mungady Exp $ * * Changes * ------- * 28-Mar-2002 : Version 1 (DG); * */ import java.awt.BorderLayout; import java.awt.event.ActionEvent; import java.awt.event.ActionListener; import javax.swing.JButton; import javax.swing.JPanel; import javax.swing.SwingWorker; import javax.swing.Timer; import org.jfree.chart.ChartFactory; import org.jfree.chart.ChartPanel; import org.jfree.chart.JFreeChart; import org.jfree.chart.axis.ValueAxis; import org.jfree.chart.plot.XYPlot; import org.jfree.data.time.Millisecond; 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 demonstration application showing a time series chart where you can * dynamically add (random) data by clicking on a button. * */ public class DynamicDataDemo extends ApplicationFrame implements ActionListener { /** The time series data. */ private TimeSeries series; /** The most recent value added. */ private double lastValue = 100.0; /** The time interval of the timer used to add new data. */ private int interval = 1; /** The timer used to add new data. */ private Timer timer; /** * Constructs a new demonstration application. * * @param title * the frame title. */ public DynamicDataDemo(final String title) { super(title); this.series = new TimeSeries("Random Data", Millisecond.class); final TimeSeriesCollection dataset = new TimeSeriesCollection(this.series); final JFreeChart chart = createChart(dataset); final ChartPanel chartPanel = new ChartPanel(chart); chartPanel.setFillZoomRectangle(false); final JButton button = new JButton("Add New Data Item"); button.setActionCommand("ADD_DATA"); button.addActionListener(this); final JButton start_button = new JButton("Start adding"); start_button.setActionCommand("START_ADDING"); start_button.addActionListener(this); final JButton stop_button = new JButton("Stop adding"); stop_button.setActionCommand("STOP_ADDING"); stop_button.addActionListener(this); final JPanel button_panel = new JPanel(); button_panel.add(button); button_panel.add(start_button); button_panel.add(stop_button); final JPanel content = new JPanel(new BorderLayout()); content.add(chartPanel); content.add(button_panel, BorderLayout.SOUTH); chartPanel.setPreferredSize(new java.awt.Dimension(500, 270)); setContentPane(content); } /** * Creates a sample chart. * * @param dataset * the dataset. * * @return A sample chart. */ private JFreeChart createChart(final XYDataset dataset) { final JFreeChart result = ChartFactory.createTimeSeriesChart("Dynamic Data Demo", "Time", "Value", dataset, true, true, false); final XYPlot plot = result.getXYPlot(); ValueAxis axis = plot.getDomainAxis(); axis.setAutoRange(true); axis.setFixedAutoRange(60000.0); // 60 seconds axis = plot.getRangeAxis(); axis.setRange(0.0, 200.0); axis.setVisible(false); return result; } // **************************************************************************** // * 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. * // **************************************************************************** /** * Handles a click on the button by adding new (random) data. * * @param e * the action event. */ public void actionPerformed(final ActionEvent e) { if (e.getActionCommand().equals("ADD_DATA")) { final double factor = 0.90 + 0.2 * Math.random(); this.lastValue = this.lastValue * factor; final Millisecond now = new Millisecond(); System.out.println("Now = " + now.toString()); this.series.add(new Millisecond(), this.lastValue); } else if (e.getActionCommand().equals("START_ADDING")) { if (timer == null) { timer = new Timer(interval, new ActionListener() { @Override public void actionPerformed(ActionEvent e) { final double factor = 0.90 + 0.2 * Math.random(); DynamicDataDemo.this.lastValue = DynamicDataDemo.this.lastValue * factor; final Millisecond now = new Millisecond(); System.out.println("Now = " + now.toString()); DynamicDataDemo.this.series.add(new Millisecond(), DynamicDataDemo.this.lastValue); } }); timer.start(); } } else if (e.getActionCommand().equals("STOP_ADDING")) { if (timer != null) { timer.stop(); } timer = null; } } /** * Starting point for the demonstration application. * * @param args * ignored. */ public static void main(final String[] args) { final DynamicDataDemo demo = new DynamicDataDemo("Dynamic Data Demo"); demo.pack(); RefineryUtilities.centerFrameOnScreen(demo); demo.setVisible(true); } }