meterchartdemo2.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.]
 *
 * --------------------
 * MeterChartDemo2.java
 * --------------------
 * (C) Copyright 2004, by Object Refinery Limited and Contributors.
 *
 * Original Author:  David Gilbert (for Object Refinery Limited);
 * Contributor(s):   -;
 *
 * $Id: MeterChartDemo2.java,v 1.5 2004/05/12 08:26:08 mungady Exp $
 *
 * Changes
 * -------
 * 09-Feb-2004 : Version 1 (DG);
 * 
 */

package org.jfree.chart.demo;

import java.awt.image.BufferedImage;
import java.io.BufferedOutputStream;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.OutputStream;

import org.jfree.chart.ChartUtilities;
import org.jfree.chart.JFreeChart;
import org.jfree.chart.plot.MeterPlot;
import org.jfree.data.general.DefaultValueDataset;
import org.jfree.data.general.ValueDataset;

/**
 * In this demo, a meter chart is saved to a scaled image file.
 */
public class MeterChartDemo2 {

    /**
     * Default constructor.
     */
    public MeterChartDemo2() {
        super();
    }

    /**
     * Starting point for the demo.
     *
     * @param args  ignored.
     */
    public static void main(final String[] args) {

        final ValueDataset dataset = new DefaultValueDataset(75.0);
        final MeterPlot plot = new MeterPlot(dataset);
        final JFreeChart chart = new JFreeChart("Scaled Image Test", plot);
        
        // ****************************************************************************
        // * 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.             *
        // ****************************************************************************
        
        // save it to an image
        try {
            final File file1 = new File("meterchart100.png");
            final OutputStream out = new BufferedOutputStream(new FileOutputStream(file1));
            final BufferedImage image = chart.createBufferedImage(200, 200, 400, 400, null);
            ChartUtilities.writeBufferedImageAsPNG(out, image);
        }
        catch (IOException e) {
            System.out.println(e.toString());
        }

    }

}