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.] * * ---------------------- * BubblyBubblesDemo.java * ---------------------- * (C) Copyright 2003, 2004, by Barak Naveh and Contributors. * * Original Author: Barak Naveh;; * Contributor(s): David Gilbert (for Object Refinery Limited); * * $Id: BubblyBubblesDemo.java,v 1.12 2004/04/26 19:11:53 taqua Exp $ * * Changes * ------- * 10-Jul-2003 : Version 1 contributed by Barak Naveh (DG); * 29-Mar-2004 : Elimintated compiler warnings while keeping JFreeChart conventions (BN); * */ package org.jfree.chart.demo; import java.awt.Color; import java.awt.GradientPaint; import org.jfree.chart.ChartFactory; import org.jfree.chart.ChartPanel; import org.jfree.chart.JFreeChart; import org.jfree.chart.axis.NumberAxis; import org.jfree.chart.plot.PlotOrientation; import org.jfree.chart.plot.XYPlot; import org.jfree.data.xy.MatrixSeriesCollection; import org.jfree.data.xy.NormalizedMatrixSeries; import org.jfree.ui.ApplicationFrame; import org.jfree.ui.RefineryUtilities; /** * A demo that shows how matrix series can be used for charts that follow a * constantly changing grid input. * * @author Barak Naveh * * @since Jun 25, 2003 */ public class BubblyBubblesDemo extends ApplicationFrame { /** The default size. */ private static final int SIZE = 10; /** The default title. */ private static final String TITLE = "Population count at grid locations"; /** * The normalized matrix series is used here to represent a changing * population on a grid. */ NormalizedMatrixSeries series; /** * A demonstration application showing a bubble chart using matrix series. * * @param title the frame title. */ public BubblyBubblesDemo(final String title) { super(title); this.series = createInitialSeries(); final MatrixSeriesCollection dataset = new MatrixSeriesCollection(this.series); final JFreeChart chart = ChartFactory.createBubbleChart(TITLE, "X", "Y", dataset, PlotOrientation.VERTICAL, true, true, false); chart.setBackgroundPaint(new GradientPaint(0, 0, Color.white, 0, 1000, Color.blue)); final XYPlot plot = chart.getXYPlot(); plot.setForegroundAlpha(0.5f); final NumberAxis domainAxis = (NumberAxis) plot.getDomainAxis(); domainAxis.setLowerBound(-0.5); final NumberAxis rangeAxis = (NumberAxis) plot.getRangeAxis(); // rangeAxis.setInverted(true); // uncoment to reproduce a bug in jFreeChart rangeAxis.setLowerBound(-0.5); final ChartPanel chartPanel = new ChartPanel(chart); // chartPanel.setVerticalZoom(true); // chartPanel.setHorizontalZoom(true); setContentPane(chartPanel); } /** * Starting point for the demonstration application. * * @param args ignored. */ public static void main(final String[] args) { final BubblyBubblesDemo demo = new BubblyBubblesDemo(TITLE); demo.pack(); demo.setSize(800, 600); RefineryUtilities.centerFrameOnScreen(demo); demo.setVisible(true); final Thread updater = demo.new UpdaterThread(); updater.setDaemon(true); updater.start(); } // **************************************************************************** // * 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 series. * * @return The series. */ private NormalizedMatrixSeries createInitialSeries() { final NormalizedMatrixSeries newSeries = new NormalizedMatrixSeries("Sample Grid 1", SIZE, SIZE); // seed a few random bubbles for (int count = 0; count < SIZE; count++) { final int i = (int) (Math.random() * SIZE); final int j = (int) (Math.random() * SIZE); final int mij = (int) (Math.random() * SIZE); newSeries.update(i, j, mij); } newSeries.setScaleFactor(newSeries.getItemCount()); return newSeries; } /** * A thread for updating the dataset. */ private class UpdaterThread extends Thread { /** * @see java.lang.Runnable#run() */ public void run() { setPriority(MIN_PRIORITY); // be nice while (true) { final int i = (int) (Math.random() * SIZE); final int j = (int) (Math.random() * SIZE); series.update(i, j, series.get(i, j) + 1); try { sleep(50); } catch (InterruptedException e) { // suppress } } } } }