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jfreechart example source code file (XYStepAreaChartTests.java)

This example jfreechart source code file (XYStepAreaChartTests.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, expecting, expecting, geometry, image, jfreechart, locallistener, locallistener, series, xydataset, xyplot, xyplot, xyseries, xyseries, xyseriescollection, xystepareacharttests

The jfreechart XYStepAreaChartTests.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.]
 *
 * -------------------------
 * XYStepAreaChartTests.java
 * -------------------------
 * (C) Copyright 2005-2008, 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.XYDataset;
import org.jfree.data.xy.XYSeries;
import org.jfree.data.xy.XYSeriesCollection;

/**
 * Some tests for an XY step area chart.
 */
public class XYStepAreaChartTests 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(XYStepAreaChartTests.class);
    }

    /**
     * Constructs a new set of tests.
     *
     * @param name  the name of the tests.
     */
    public XYStepAreaChartTests(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);
        XYDataset dataset = new XYSeriesCollection(series1);

        // create the chart...
        return ChartFactory.createXYStepAreaChart(
            "Step Chart",  // chart title
            "Domain",
            "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;
        }

    }

}

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