xybarcharttests.java

JFreeChart是做统计图表的,、混合图、甘特图以及一些仪表盘

/* ===========================================================
 * 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.]
 *
 * --------------------
 * XYBarChartTests.java
 * --------------------
 * (C) Copyright 2005, 2007, by Object Refinery Limited.
 *
 * Original Author:  David Gilbert (for Object Refinery Limited);
 * Contributor(s):   -;
 *
 * Changes:
 * --------
 * 12-Apr-2005 : 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.axis.ValueAxis;
import org.jfree.chart.event.ChartChangeEvent;
import org.jfree.chart.event.ChartChangeListener;
import org.jfree.chart.labels.StandardXYToolTipGenerator;
import org.jfree.chart.labels.XYToolTipGenerator;
import org.jfree.chart.plot.PlotOrientation;
import org.jfree.chart.plot.XYPlot;
import org.jfree.chart.renderer.xy.XYItemRenderer;
import org.jfree.data.Range;
import org.jfree.data.xy.IntervalXYDataset;
import org.jfree.data.xy.XYBarDataset;
import org.jfree.data.xy.XYDataset;
import org.jfree.data.xy.XYSeries;
import org.jfree.data.xy.XYSeriesCollection;

/**
 * Some tests for an XY bar chart.
 */
public class XYBarChartTests 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(XYBarChartTests.class);
    }

    /**
     * Constructs a new set of tests.
     *
     * @param name  the name of the tests.
     */
    public XYBarChartTests(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;
          e.printStackTrace();
        }
        assertTrue(success);

    }

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

        // create a dataset...
        XYSeries series1 = new XYSeries("Series 1");
        series1.add(10.0, 10.0);
        series1.add(20.0, 20.0);
        series1.add(30.0, 30.0);
        XYDataset dataset = new XYSeriesCollection(series1);

        LocalListener l = new LocalListener();
        this.chart.addChangeListener(l);
        
        XYPlot plot = (XYPlot) this.chart.getPlot();
        plot.setDataset(dataset);
        assertEquals(true, l.flag);
        ValueAxis axis = plot.getRangeAxis();
        Range range = axis.getRange();
        assertTrue("Expecting the lower bound of the range to be around 10: "
                   + range.getLowerBound(), range.getLowerBound() <= 10);
        assertTrue("Expecting the upper bound of the range to be around 30: "
                   + range.getUpperBound(), range.getUpperBound() >= 30);

    }

    /**
     * Check that setting a tool tip generator for a series does override the
     * default generator.
     */
    public void testSetSeriesToolTipGenerator() {
        XYPlot plot = (XYPlot) this.chart.getPlot();
        XYItemRenderer renderer = plot.getRenderer();
        StandardXYToolTipGenerator tt = new StandardXYToolTipGenerator();
        renderer.setSeriesToolTipGenerator(0, tt);
        XYToolTipGenerator tt2 = renderer.getToolTipGenerator(0, 0);
        assertTrue(tt2 == tt);
    }
    
    /**
     * Create a horizontal bar chart with sample data in the range -3 to +3.
     *
     * @return The chart.
     */
    private static JFreeChart createChart() {

        // create a dataset...
        XYSeries series1 = new XYSeries("Series 1");
        series1.add(1.0, 1.0);
        series1.add(2.0, 2.0);
        series1.add(3.0, 3.0);
        IntervalXYDataset dataset = new XYBarDataset(new XYSeriesCollection(
                series1), 1.0);
 
        // create the chart...
        return ChartFactory.createXYBarChart(
            "XY Bar Chart",  // chart title
            "Domain", false,
            "Range",
            dataset,         // data
            PlotOrientation.VERTICAL,
            true,            // include legend
            true,            // tooltips
            true             // urls
        );

    }

    /**
     * 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;
        }

    }

}