histogramdemo2.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.]
 *
 * -------------------
 * HistogramDemo2.java
 * -------------------
 * (C) Copyright 2004, by Object Refinery Limited and Contributors.
 *
 * Original Author:  David Gilbert (for Object Refinery Limited);
 * Contributor(s):   -;
 *
 * $Id: HistogramDemo2.java,v 1.3 2004/04/26 19:11:54 taqua Exp $
 *
 * Changes
 * -------
 * 01-Mar-2004 : Version 1 (DG);
 *
 */

package org.jfree.chart.demo;

import java.io.IOException;

import org.jfree.chart.ChartFactory;
import org.jfree.chart.ChartPanel;
import org.jfree.chart.JFreeChart;
import org.jfree.chart.plot.PlotOrientation;
import org.jfree.data.statistics.HistogramDataset;
import org.jfree.data.xy.IntervalXYDataset;
import org.jfree.ui.ApplicationFrame;
import org.jfree.ui.RefineryUtilities;

/**
 * A demo of the {@link HistogramDataset} class.
 */
public class HistogramDemo2 extends ApplicationFrame {

    /**
     * Creates a new demo.
     * 
     * @param title  the frame title.
     */
    public HistogramDemo2(final String title) {
        super(title);    
        final IntervalXYDataset dataset = createDataset();
        final JFreeChart chart = createChart(dataset);
        final ChartPanel chartPanel = new ChartPanel(chart);
        chartPanel.setPreferredSize(new java.awt.Dimension(500, 270));
        setContentPane(chartPanel);
    }
    
    /**
     * Creates a sample {@link HistogramDataset}.
     * 
     * @return the dataset.
     */
    private IntervalXYDataset createDataset() {
        final HistogramDataset dataset = new HistogramDataset();
        final double[] values = {1.0, 2.0, 3.0, 4.0, 5.0, 6.0, 7.0, 8.0, 9.0, 10.0};
        dataset.addSeries("H1", values, 10, 0.0, 10.0);
        return dataset;     
    }
    
    // ****************************************************************************
    // * 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  a dataset.
     * 
     * @return The chart.
     */
    private JFreeChart createChart(final IntervalXYDataset dataset) {
        final JFreeChart chart = ChartFactory.createHistogram(
            "Histogram Demo", 
            null, 
            null, 
            dataset, 
            PlotOrientation.VERTICAL, 
            true, 
            false, 
            false
        );
        chart.getXYPlot().setForegroundAlpha(0.75f);
        return chart;
    }
        
    /**
     * The starting point for the demo.
     * 
     * @param args  ignored.
     * 
     * @throws IOException  if there is a problem saving the file.
     */
    public static void main(final String[] args) throws IOException {
        
        final HistogramDemo2 demo = new HistogramDemo2("Histogram Demo 2");
        demo.pack();
        RefineryUtilities.centerFrameOnScreen(demo);
        demo.setVisible(true);
        
    }

}