stackedbarcharttests.java

jfreechart安装程序和使用说明

/* ===========================================================
 * 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.]
 *
 * -------------------------
 * StackedBarChartTests.java
 * -------------------------
 * (C) Copyright 2002-2004, by Object Refinery Limited.
 *
 * Original Author:  David Gilbert (for Object Refinery Limited);
 * Contributor(s):   -;
 *
 * $Id: StackedBarChartTests.java,v 1.1 2004/08/31 14:35:34 mungady Exp $
 *
 * Changes:
 * --------
 * 11-Jun-2002 : Version 1 (DG);
 * 25-Jun-2002 : Removed unnecessary import (DG);
 * 17-Oct-2002 : Fixed errors reported by Checkstyle (DG);
 * 29-Jan-2004 : Renamed StackedHorizontalBarChartTests --> StackedBarChartTests (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.axis.ValueAxis;
import org.jfree.chart.event.ChartChangeEvent;
import org.jfree.chart.event.ChartChangeListener;
import org.jfree.chart.plot.PlotOrientation;
import org.jfree.data.Range;
import org.jfree.data.category.CategoryDataset;
import org.jfree.data.general.DatasetUtilities;

/**
 * Tests for a stacked bar chart.
 *
 */
public class StackedBarChartTests extends TestCase {

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

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

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

    /**
     * Common test setup.
     */
    protected void setUp() {
        this.chart = createChart();
    }

    /**
     * Draws the chart with a null info object to make sure that no exceptions are thrown (a
     * problem that was occurring at one point).
     */
    public void testDrawWithNullInfo() {

        boolean success = false;

        try {
            BufferedImage image = new BufferedImage(200 , 100, BufferedImage.TYPE_INT_RGB);
            Graphics2D g2 = image.createGraphics();
            this.chart.draw(g2, new Rectangle2D.Double(0, 0, 200, 100), null, null);
            g2.dispose();
            success = true;
        }
        catch (Exception e) {
          success = false;
        }

        assertTrue(success);

    }

    /**
     * Replaces the dataset and checks that it has changed as expected.
     */
    public void testReplaceDataset() {

        // create a dataset...
        Number[][] data = new Integer[][]
            {{new Integer(-30), new Integer(-20)},
             {new Integer(-10), new Integer(10)},
             {new Integer(20), new Integer(30)}};

        CategoryDataset newData = DatasetUtilities.createCategoryDataset("S", "C", data);

        LocalListener l = new LocalListener();
        this.chart.addChangeListener(l);
        this.chart.getCategoryPlot().setDataset(newData);
        assertEquals(true, l.flag);
        ValueAxis axis = this.chart.getCategoryPlot().getRangeAxis();
        Range range = axis.getRange();
        assertTrue("Expecting the lower bound of the range to be around -30: "
                    + range.getLowerBound(), range.getLowerBound() <= -30);
        assertTrue("Expecting the upper bound of the range to be around 30: "
                   + range.getUpperBound(), range.getUpperBound() >= 30);

    }

    /**
     * Create a horizontal bar chart with sample data in the range -3 to +3.
     *
     * @return the chart.
     */
    private static JFreeChart createChart() {

        // create a dataset...
        Number[][] data = new Integer[][]
            {{new Integer(-3), new Integer(-2)},
             {new Integer(-1), new Integer(1)},
             {new Integer(2), new Integer(3)}};

        CategoryDataset dataset = DatasetUtilities.createCategoryDataset("S", "C", data);

        // create the chart...
        return ChartFactory.createStackedBarChart(
            "Stacked Bar Chart",  // chart title
            "Domain", "Range",
            dataset,      // data
            PlotOrientation.HORIZONTAL,
            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;
        }

    }

}