jfreechart example source code file (PieChart3DTests.java)

This example jfreechart source code file (PieChart3DTests.java) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" ^TM.

Java - jfreechart tags/keywords

awt, bufferedimage, defaultpiedataset, defaultpiedataset, geometry, image, jfreechart, jfreechart, locallistener, locallistener, piechart3dtests, pieplot, section, section, test, testcase, visual

The jfreechart PieChart3DTests.java source code

/* ===========================================================
 * JFreeChart : a free chart library for the Java(tm) platform
 * ===========================================================
 *
 * (C) Copyright 2000-2008, 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 2004-2008, by Object Refinery Limited.
 *
 * Original Author:  David Gilbert (for Object Refinery Limited);
 * Contributor(s):   -;
 *
 * 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
     * 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;
        }

    }

}