# XYLineChartTests.java

    /* ===========================================================
     * 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.]
     *
     * ---------------------
     * XYLineChartTests.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.XYDataset;
    import org.jfree.data.xy.XYSeries;
    import org.jfree.data.xy.XYSeriesCollection;

    /**
     * Some tests for an XY line chart.
     */
    public class XYLineChartTests 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(XYLineChartTests.class);
        }

        /**
         * Constructs a new set of tests.
         *
         * @param name  the name of the tests.
         */
        public XYLineChartTests(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.createXYLineChart(
                "XY Line 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;
            }

        }

    }