piechart3dtests.java

java图形利器

/* ===========================================================
 * JFreeChart : a free chart library for the Java(tm) platform
 * ===========================================================
 *
 * (C) Copyright 2000-2007, 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., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, 
 * USA.  
 *
 * [Java is a trademark or registered trademark of Sun Microsystems, Inc. 
 * in the United States and other countries.]
 *
 * --------------------
 * PieChart3DTests.java
 * --------------------
 * (C) Copyright 2004, 2007, by Object Refinery Limited.
 *
 * Original Author:  David Gilbert (for Object Refinery Limited);
 * Contributor(s):   -;
 *
 * $Id: PieChart3DTests.java,v 1.1.2.2 2007/03/02 11:16:21 mungady Exp $
 *
 * Changes:
 * --------
 * 21-May-2004 : Version 1 (DG);
 *
 */

package org.jfree.chart.junit;

import java.awt.Graphics2D;
import java.awt.geom.Rectangle2D;
import java.awt.image.BufferedImage;

import junit.framework.Test;
import junit.framework.TestCase;
import junit.framework.TestSuite;

import org.jfree.chart.ChartFactory;
import org.jfree.chart.JFreeChart;
import org.jfree.chart.event.ChartChangeEvent;
import org.jfree.chart.event.ChartChangeListener;
import org.jfree.chart.plot.PiePlot;
import org.jfree.data.general.DefaultPieDataset;
import org.jfree.data.general.PieDataset;

/**
 * Tests for a pie chart with a 3D effect.
 */
public class PieChart3DTests extends TestCase {

    /** A chart. */
    private JFreeChart pieChart;

    /**
     * Returns the tests as a test suite.
     *
     * @return The test suite.
     */
    public static Test suite() {
        return new TestSuite(PieChart3DTests.class);
    }

    /**
     * Constructs a new set of tests.
     *
     * @param name  the name of the tests.
     */
    public PieChart3DTests(String name) {
        super(name);
    }

    /**
     * Common test setup.
     */
    protected void setUp() {
        // create a dataset...
        DefaultPieDataset dataset = new DefaultPieDataset();
        dataset.setValue("Java", new Double(43.2));
        dataset.setValue("Visual Basic", new Double(0.0));
        dataset.setValue("C/C++", new Double(17.5));
        this.pieChart = createPieChart3D(dataset);
    }

    /**
     * Using a regular pie chart, we replace the dataset with null.  Expect to 
     * receive notification of a chart change event, and (of course) the 
     * dataset should be null.
     */
    public void testReplaceDatasetOnPieChart() {
        LocalListener l = new LocalListener();
        this.pieChart.addChangeListener(l);
        PiePlot plot = (PiePlot) this.pieChart.getPlot();
        plot.setDataset(null);
        assertEquals(true, l.flag);
        assertNull(plot.getDataset());
    }

    /**
     * Tests that no exceptions are thrown when there is a <code>null</code> 
     * value in the dataset.
     */
    public void testNullValueInDataset() {
        DefaultPieDataset dataset = new DefaultPieDataset();
        dataset.setValue("Section 1", 10.0);
        dataset.setValue("Section 2", 11.0);
        dataset.setValue("Section 3", null);
        JFreeChart chart = createPieChart3D(dataset);
        boolean success = false;
        try {
            BufferedImage image = new BufferedImage(200 , 100, 
                    BufferedImage.TYPE_INT_RGB);
            Graphics2D g2 = image.createGraphics();
            chart.draw(g2, new Rectangle2D.Double(0, 0, 200, 100), null, null);
            g2.dispose();
            success = true;
        }
        catch (Throwable t) {
            success = false;
        }
        assertTrue(success);
    }
    
    /**
     * Creates a pie chart.
     *
     * @param dataset  the dataset.
     * 
     * @return The pie chart.
     */
    private static JFreeChart createPieChart3D(PieDataset dataset) {

        return ChartFactory.createPieChart3D(
            "Pie Chart",  // chart title
            dataset,      // data
            true,         // include legend
            true,
            false
        );
    }

    /**
     * A chart change listener.
     */
    static class LocalListener implements ChartChangeListener {

        /** A flag. */
        private boolean flag = false;

        /**
         * Event handler.
         *
         * @param event  the event.
         */
        public void chartChanged(ChartChangeEvent event) {
            this.flag = true;
        }

    }

}