praktikum-holons/jars/jfreechart-1.0.19/tests/org/jfree/chart/LineChartTest.java

/* ===========================================================
 * JFreeChart : a free chart library for the Java(tm) platform
 * ===========================================================
 *
 * (C) Copyright 2000-2013, 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.
 *
 * [Oracle and Java are registered trademarks of Oracle and/or its affiliates. 
 * Other names may be trademarks of their respective owners.]
 *
 * ------------------
 * LineChartTest.java
 * ------------------
 * (C) Copyright 2005-2013, 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;

import org.jfree.chart.axis.ValueAxis;
import org.jfree.chart.event.ChartChangeEvent;
import org.jfree.chart.event.ChartChangeListener;
import org.jfree.chart.labels.CategoryToolTipGenerator;
import org.jfree.chart.labels.StandardCategoryToolTipGenerator;
import org.jfree.chart.plot.CategoryPlot;
import org.jfree.chart.renderer.category.CategoryItemRenderer;
import org.jfree.chart.urls.CategoryURLGenerator;
import org.jfree.chart.urls.StandardCategoryURLGenerator;
import org.jfree.data.Range;
import org.jfree.data.category.CategoryDataset;
import org.jfree.data.general.DatasetUtilities;
import org.junit.Before;
import org.junit.Test;

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

import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertSame;
import static org.junit.Assert.assertTrue;

/**
 * Some tests for a line chart.
 */
public class LineChartTest  {

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

    /**
     * Common test setup.
     */
    @Before
    public void setUp() {
        this.chart = createLineChart();
    }

    /**
     * Draws the chart with a null info object to make sure that no exceptions
     * are thrown (a problem that was occurring at one point).
     */
    @Test
    public void testDrawWithNullInfo() {
        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();
        //FIXME we should really assert a value here
    }

    /**
     * Replaces the chart's dataset and then checks that the new dataset is OK.
     */
    @Test
    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);
        CategoryPlot plot = (CategoryPlot) this.chart.getPlot();
        plot.setDataset(newData);
        assertEquals(true, l.flag);
        ValueAxis axis = plot.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);

    }

    /**
     * Check that setting a tool tip generator for a series does override the
     * default generator.
     */
    @Test
    public void testSetSeriesToolTipGenerator() {
        CategoryPlot plot = (CategoryPlot) this.chart.getPlot();
        CategoryItemRenderer renderer = plot.getRenderer();
        StandardCategoryToolTipGenerator tt
                = new StandardCategoryToolTipGenerator();
        renderer.setSeriesToolTipGenerator(0, tt);
        CategoryToolTipGenerator tt2 = renderer.getToolTipGenerator(0, 0);
        assertSame(tt2, tt);
    }

    /**
     * Check that setting a URL generator for a series does override the
     * default generator.
     */
    @Test
    public void testSetSeriesURLGenerator() {
        CategoryPlot plot = (CategoryPlot) this.chart.getPlot();
        CategoryItemRenderer renderer = plot.getRenderer();
        StandardCategoryURLGenerator url1
                = new StandardCategoryURLGenerator();
        renderer.setSeriesItemURLGenerator(0, url1);
        CategoryURLGenerator url2 = renderer.getItemURLGenerator(0, 0);
        assertSame(url2, url1);
    }

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

        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);

        return ChartFactory.createLineChart("Line Chart", "Domain", "Range",
                dataset);

    }

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

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

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

    }

}