gridarrangementtests.java

java开发中使用Jfreechart进行画图的源码

/* ===========================================================
 * 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.]
 *
 * -------------------------
 * GridArrangementTests.java
 * -------------------------
 * (C) Copyright 2005-2008, by Object Refinery Limited and Contributors.
 *
 * Original Author:  David Gilbert (for Object Refinery Limited);
 * Contributor(s):   -;
 *
 * Changes
 * -------
 * 08-Mar-2005 : Version 1 (DG);
 *
 */

package org.jfree.chart.block.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.block.Block;
import org.jfree.chart.block.BlockContainer;
import org.jfree.chart.block.EmptyBlock;
import org.jfree.chart.block.GridArrangement;
import org.jfree.chart.block.LengthConstraintType;
import org.jfree.chart.block.RectangleConstraint;
import org.jfree.ui.Size2D;

/**
 * Tests for the {@link GridArrangement} class.
 */
public class GridArrangementTests extends TestCase {

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

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

    /**
     * Confirm that the equals() method can distinguish all the required fields.
     */
    public void testEquals() {
        GridArrangement f1 = new GridArrangement(11, 22);
        GridArrangement f2 = new GridArrangement(11, 22);
        assertTrue(f1.equals(f2));
        assertTrue(f2.equals(f1));

        f1 = new GridArrangement(33, 22);
        assertFalse(f1.equals(f2));
        f2 = new GridArrangement(33, 22);
        assertTrue(f1.equals(f2));

        f1 = new GridArrangement(33, 44);
        assertFalse(f1.equals(f2));
        f2 = new GridArrangement(33, 44);
        assertTrue(f1.equals(f2));
    }

    /**
     * Immutable - cloning is not necessary.
     */
    public void testCloning() {
        GridArrangement f1 = new GridArrangement(1, 2);
        assertFalse(f1 instanceof Cloneable);
    }

    /**
     * Serialize an instance, restore it, and check for equality.
     */
    public void testSerialization() {
        GridArrangement f1 = new GridArrangement(33, 44);
        GridArrangement f2 = null;
        try {
            ByteArrayOutputStream buffer = new ByteArrayOutputStream();
            ObjectOutput out = new ObjectOutputStream(buffer);
            out.writeObject(f1);
            out.close();

            ObjectInput in = new ObjectInputStream(
                new ByteArrayInputStream(buffer.toByteArray())
            );
            f2 = (GridArrangement) in.readObject();
            in.close();
        }
        catch (Exception e) {
            e.printStackTrace();
        }
        assertEquals(f1, f2);
    }

    private static final double EPSILON = 0.000000001;

    /**
     * Test arrangement with no constraints.
     */
    public void testNN() {
        BlockContainer c = createTestContainer1();
        Size2D s = c.arrange(null, RectangleConstraint.NONE);
        assertEquals(90.0, s.width, EPSILON);
        assertEquals(33.0, s.height, EPSILON);
    }

    /**
     * Test arrangement with no constraints.
     */
    public void testFN() {
        BlockContainer c = createTestContainer1();
        RectangleConstraint constraint = new RectangleConstraint(
            100.0, null, LengthConstraintType.FIXED,
            0.0, null, LengthConstraintType.NONE
        );
        Size2D s = c.arrange(null, constraint);
        assertEquals(100.0, s.width, EPSILON);
        assertEquals(33.0, s.height, EPSILON);
    }

    private BlockContainer createTestContainer1() {
        Block b1 = new EmptyBlock(10, 11);
        Block b2 = new EmptyBlock(20, 22);
        Block b3 = new EmptyBlock(30, 33);
        BlockContainer result = new BlockContainer(new GridArrangement(1, 3));
        result.add(b1);
        result.add(b2);
        result.add(b3);
        return result;
    }

}