demodatasetfactory.java

JfreeChart 常用图表例子

/* ===========================================================
 * 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.]
 *
 * -----------------------
 * DemoDatasetFactory.java
 * -----------------------
 * (C) Copyright 2001-2004, by Object Refinery Limited.
 *
 * Original Author:  David Gilbert (for Object Refinery Limited);
 * Contributor(s):   Bryan Scott;
 *                   Bill Kelemen;
 *                   David Browning;
 *                   Robert Redburn;
 *
 * $Id: DemoDatasetFactory.java,v 1.27 2004/04/26 19:11:54 taqua Exp $
 *
 * Changes
 * -------
 * 10-Dec-2001 : Version 1 (DG);
 * 15-Mar-2002 : Added createHighLowOpenCloseDataset() method (DG);
 * 20-Jun-2002 : Added createMeterDataset() method (BRS);
 * 24-Jun-2002 : Moved createGanttDataset() method from GanttDemo (BRS);
 * 10-Oct-2002 : Fixed errors reported by Checkstyle (DG);
 * 24-May-2003 : Added createSegmentedHighLowDataset(..) (BK);
 * 05-Aug-2003 : Added createBoxAndWhiskerDataset() method (DB);
 * 08-Aug-2003 : Refined createBoxAndWhiskerDataset() method (DB);
 * 19-Jan-2004 : Added createWaferMapDataset() and
 *                     createRandomWaferMapDataset() methods (RR);
 *
 */

package org.jfree.chart.demo;

import java.util.Date;
import java.util.Random;

import org.jfree.chart.axis.SegmentedTimeline;
import org.jfree.data.category.CategoryDataset;
import org.jfree.data.category.IntervalCategoryDataset;
import org.jfree.data.general.DatasetUtilities;
import org.jfree.data.general.WaferMapDataset;
import org.jfree.data.time.Day;
import org.jfree.data.time.FixedMillisecond;
import org.jfree.data.time.TimeSeries;
import org.jfree.data.time.TimeSeriesCollection;
import org.jfree.data.time.Year;
import org.jfree.data.xy.DefaultHighLowDataset;
import org.jfree.data.xy.DefaultWindDataset;
import org.jfree.data.xy.SignalsDataset;
import org.jfree.data.xy.WindDataset;
import org.jfree.data.xy.XYDataset;
import org.jfree.date.DateUtilities;
import org.jfree.date.MonthConstants;

/**
 * A utility class for generating sample datasets for the demos.
 * <p>
 * These datasets are hard-coded so that they are easily accessible for the demonstration
 * applications.  In a real application, you would create datasets dynamically by reading data from
 * a file, a database, or some other source.
 *
 */
public abstract class DemoDatasetFactory {
    
    /**
     * Creates and returns a {@link CategoryDataset} for the demo charts.
     *
     * @return a sample dataset.
     */
    public static CategoryDataset createCategoryDataset() {

        final double[][] data = new double[][]
            {{10.0, 4.0, 15.0, 14.0},
             {-5.0, -7.0, 14.0, -3.0},
             {6.0, 17.0, -12.0, 7.0},
             {7.0, 15.0, 11.0, 0.0},
             {-8.0, -6.0, 10.0, -9.0},
             {9.0, 8.0, 0.0, 6.0},
             {-10.0, 9.0, 7.0, 7.0},
             {11.0, 13.0, 9.0, 9.0},
             {-3.0, 7.0, 11.0, -10.0}};

        return DatasetUtilities.createCategoryDataset("Series ", "Category ", data);

    }

    /**
     * Creates and returns a category dataset with JUST ONE CATEGORY for the demo charts.
     *
     * @return a sample category dataset.
     */
    public static CategoryDataset createSingleCategoryDataset() {

        final Number[][] data = new Integer[][]
            {{new Integer(10)},
             {new Integer(-5)},
             {new Integer(6)},
             {new Integer(7)},
             {new Integer(-8)},
             {new Integer(9)},
             {new Integer(-10)},
             {new Integer(11)},
             {new Integer(-3)}};

        return DatasetUtilities.createCategoryDataset("Series ", "Category ", data);

    }

    /**
     * Creates and returns a category dataset for the demo charts.
     *
     * @return a sample category dataset.
     */
    public static CategoryDataset createSingleSeriesCategoryDataset() {

        final double[][] data = new double[][] {{10.0, -4.0, 15.0, 14.0}};

        return DatasetUtilities.createCategoryDataset("Series ", "Category ", data);

    }

    /**
     * Returns a null interval category dataset.
     *
     * @return null.
     */
    public static IntervalCategoryDataset createIntervalCategoryDataset() {

        return null;

    }

    /**
     * Returns a sample XY dataset.
     *
     * @return a sample XY dataset.
     */
    public static XYDataset createSampleXYDataset() {
        return new SampleXYDataset();
    }

    /**
     * Returns a dataset consisting of one annual series.
     *
     * @return a sample time series collection.
     */
    public static TimeSeriesCollection createTimeSeriesCollection1() {

        final TimeSeries t1 = new TimeSeries("Annual", "Year", "Value", Year.class);
        try {
            t1.add(new Year(1990), new Double(50.1));
            t1.add(new Year(1991), new Double(12.3));
            t1.add(new Year(1992), new Double(23.9));
            t1.add(new Year(1993), new Double(83.4));
            t1.add(new Year(1994), new Double(-34.7));
            t1.add(new Year(1995), new Double(76.5));
            t1.add(new Year(1996), new Double(10.0));
            t1.add(new Year(1997), new Double(-14.7));
            t1.add(new Year(1998), new Double(43.9));
            t1.add(new Year(1999), new Double(49.6));
            t1.add(new Year(2000), new Double(37.2));
            t1.add(new Year(2001), new Double(17.1));
        }
        catch (Exception e) {
            System.err.println(e.getMessage());
        }

        return new TimeSeriesCollection(t1);

    }

    /**
     * Creates a time series collection containing JPY/GBP exchange rates.
     *
     * @return a sample time series collection.