stackedxyarearenderer2tests.java

来自「JfreeChart 常用图表例子」· Java 代码 · 共 169 行

/* ===========================================================
 * JFreeChart : a free chart library for the Java(tm) platform
 * ===========================================================
 *
 * (C) Copyright 2000-2005, 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.]
 *
 * -------------------------------
 * StackedXYAreaRenderer2Tests.java
 * -------------------------------
 * (C) Copyright 2005, by Object Refinery Limited and Contributors.
 *
 * Original Author:  David Gilbert (for Object Refinery Limited);
 * Contributor(s):   -;
 *
 * $Id: StackedXYAreaRenderer2Tests.java,v 1.3 2005/04/20 22:19:11 mungady Exp $
 *
 * Changes
 * -------
 * 06-Jan-2005 : Version 1 (DG);
 *
 */

package org.jfree.chart.renderer.xy.junit;

import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.ObjectInput;
import java.io.ObjectInputStream;
import java.io.ObjectOutput;
import java.io.ObjectOutputStream;

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.NumberAxis;
import org.jfree.chart.plot.PlotOrientation;
import org.jfree.chart.plot.XYPlot;
import org.jfree.chart.renderer.xy.StackedXYAreaRenderer2;
import org.jfree.data.Range;
import org.jfree.data.xy.TableXYDataset;

/**
 * Tests for the {@link StackedXYAreaRenderer2} class.
 */
public class StackedXYAreaRenderer2Tests extends TestCase {

    /**
     * Returns the tests as a test suite.
     *
     * @return The test suite.
     */
    public static Test suite() {
        return new TestSuite(StackedXYAreaRenderer2Tests.class);
    }

    /**
     * Constructs a new set of tests.
     *
     * @param name  the name of the tests.
     */
    public StackedXYAreaRenderer2Tests(String name) {
        super(name);
    }

    /**
     * Test that the equals() method distinguishes all fields.
     */
    public void testEquals() {
        StackedXYAreaRenderer2 r1 = new StackedXYAreaRenderer2();
        StackedXYAreaRenderer2 r2 = new StackedXYAreaRenderer2();
        assertEquals(r1, r2);
        assertEquals(r2, r1);
    }

    /**
     * Two objects that are equal are required to return the same hashCode. 
     */
    public void testHashcode() {
        StackedXYAreaRenderer2 r1 = new StackedXYAreaRenderer2();
        StackedXYAreaRenderer2 r2 = new StackedXYAreaRenderer2();
        assertTrue(r1.equals(r2));
        int h1 = r1.hashCode();
        int h2 = r2.hashCode();
        assertEquals(h1, h2);
    }
    
    /**
     * Confirm that cloning works.
     */
    public void testCloning() {
        StackedXYAreaRenderer2 r1 = new StackedXYAreaRenderer2();
        StackedXYAreaRenderer2 r2 = null;
        try {
            r2 = (StackedXYAreaRenderer2) r1.clone();
        }
        catch (CloneNotSupportedException e) {
            System.err.println("Failed to clone.");
        }
        assertTrue(r1 != r2);
        assertTrue(r1.getClass() == r2.getClass());
        assertTrue(r1.equals(r2));
    }

    /**
     * Serialize an instance, restore it, and check for equality.
     */
    public void testSerialization() {
        StackedXYAreaRenderer2 r1 = new StackedXYAreaRenderer2();
        StackedXYAreaRenderer2 r2 = null;
        try {
            ByteArrayOutputStream buffer = new ByteArrayOutputStream();
            ObjectOutput out = new ObjectOutputStream(buffer);
            out.writeObject(r1);
            out.close();

            ObjectInput in = new ObjectInputStream(
                new ByteArrayInputStream(buffer.toByteArray())
            );
            r2 = (StackedXYAreaRenderer2) in.readObject();
            in.close();
        }
        catch (Exception e) {
            System.out.println(e.toString());
        }
        assertEquals(r1, r2);
    }
    
    /**
     * Check that the renderer is calculating the range bounds correctly.
     */
    public void testFindRangeBounds() {
        TableXYDataset dataset 
            = RendererXYPackageTests.createTestTableXYDataset();
        JFreeChart chart = ChartFactory.createStackedXYAreaChart(
            "Test Chart", "X", "Y", dataset, 
            PlotOrientation.VERTICAL, false, false, false
        );
        XYPlot plot = (XYPlot) chart.getPlot();
        plot.setRenderer(new StackedXYAreaRenderer2());
        NumberAxis rangeAxis = (NumberAxis) plot.getRangeAxis();
        Range bounds = rangeAxis.getRange();
        assertTrue(bounds.contains(6.0));
        assertTrue(bounds.contains(8.0));
    }

}