numberaxistests.java

大家打开看看啊, 很有用的东西

/* ======================================
 * JFreeChart : a free Java chart library
 * ======================================
 *
 * Project Info:  http://www.jfree.org/jfreechart/index.html
 * Project Lead:  David Gilbert ([e-mail]);
 *
 * (C) Copyright 2000-2003, by Object Refinery Limited and Contributors.
 *
 * 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.
 *
 * --------------------
 * NumberAxisTests.java
 * --------------------
 * (C) Copyright 2003 by Object Refinery Limited and Contributors.
 *
 * Original Author:  David Gilbert (for Object Refinery Limited);
 * Contributor(s):   -;
 *
 * $Id: NumberAxisTests.java,v 1.5 2003/07/21 11:13:09 mungady Exp $
 *
 * Changes
 * -------
 * 26-Mar-2003 : Version 1 (DG);
 *
 */

package org.jfree.chart.axis.junit;

import java.awt.geom.Rectangle2D;
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.axis.NumberAxis;
import org.jfree.ui.RectangleEdge;

/**
 * Tests for the {@link HorizontalNumberAxis} class.
 *
 * @author David Gilbert
 */
public class NumberAxisTests extends TestCase {

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

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

    /**
     * Tests two doubles for 'near enough' equality.
     * 
     * @param d1  number 1.
     * @param d2  number 2.
     * @param tolerance  maximum tolerance.
     * 
     * @return A boolean.
     */
    private boolean same(double d1, double d2, double tolerance) {
        return (Math.abs(d1 - d2) < tolerance);
    }
    
    /**
     * Test the translation of Java2D values to data values.
     */
    public void testTranslateJava2DToValue() {
        NumberAxis axis = new NumberAxis();
        axis.setRange(50.0, 100.0); 
        Rectangle2D dataArea = new Rectangle2D.Double(10.0, 50.0, 400.0, 300.0);
        double y1 = axis.translateJava2DtoValue(75.0f, dataArea, RectangleEdge.LEFT);  
        assertTrue(same(y1, 95.8333333, 0.000001)); 
        double y2 = axis.translateJava2DtoValue(75.0f, dataArea, RectangleEdge.RIGHT);   
        assertTrue(same(y2, 95.8333333, 0.000001)); 
        double x1 = axis.translateJava2DtoValue(75.0f, dataArea, RectangleEdge.TOP);   
        assertTrue(same(x1, 58.125, 0.000001)); 
        double x2 = axis.translateJava2DtoValue(75.0f, dataArea, RectangleEdge.BOTTOM);   
        assertTrue(same(x2, 58.125, 0.000001)); 
        axis.setInverted(true);
        double y3 = axis.translateJava2DtoValue(75.0f, dataArea, RectangleEdge.LEFT);  
        assertTrue(same(y3, 54.1666667, 0.000001)); 
        double y4 = axis.translateJava2DtoValue(75.0f, dataArea, RectangleEdge.RIGHT);   
        assertTrue(same(y4, 54.1666667, 0.000001)); 
        double x3 = axis.translateJava2DtoValue(75.0f, dataArea, RectangleEdge.TOP);   
        assertTrue(same(x3, 91.875, 0.000001)); 
        double x4 = axis.translateJava2DtoValue(75.0f, dataArea, RectangleEdge.BOTTOM);   
        assertTrue(same(x4, 91.875, 0.000001)); 
        
    }
    
    /**
     * Serialize an instance, restore it, and check for equality.
     */
    public void testSerialization() {

        NumberAxis a1 = new NumberAxis("Test Axis");
        NumberAxis a2 = null;

        try {
            ByteArrayOutputStream buffer = new ByteArrayOutputStream();
            ObjectOutput out = new ObjectOutputStream(buffer);
            out.writeObject(a1);
            out.close();

            ObjectInput in = new ObjectInputStream(new ByteArrayInputStream(buffer.toByteArray()));
            a2 = (NumberAxis) in.readObject();
            in.close();
        }
        catch (Exception e) {
            System.out.println(e.toString());
        }
        assertEquals(a1, a2);

    }

}