MathTest.java :  » Java-2D » jbox2d » org » jbox2d » utests » Java Open Source

/*******************************************************************************
 * Copyright (c) 2011, Daniel Murphy
 * All rights reserved.
 * 
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *     * Redistributions of source code must retain the above copyright
 *       notice, this list of conditions and the following disclaimer.
 *     * Redistributions in binary form must reproduce the above copyright
 *       notice, this list of conditions and the following disclaimer in the
 *       documentation and/or other materials provided with the distribution.
 *     * Neither the name of the <organization> nor the
 *       names of its contributors may be used to endorse or promote products
 *       derived from this software without specific prior written permission.
 * 
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED. IN NO EVENT SHALL DANIEL MURPHY BE LIABLE FOR ANY
 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 ******************************************************************************/
/**
 * Created at 4:32:38 AM Jan 14, 2011
 */
package org.jbox2d.utests;

import java.util.Random;

import org.jbox2d.common.MathUtils;

import junit.framework.TestCase;

/**
 * @author Daniel Murphy
 */
public class MathTest extends TestCase {
  
  private final static int MAX = (int)(Float.MAX_VALUE/1000);
  private final static int RAND_ITERS = 100;
  
  public void testFastMath() {
    Random r = new Random();
    for (int i = 0; i < RAND_ITERS; i++) {
      float a = r.nextFloat() * MAX - MAX/2;
      assertEquals((int)Math.floor(a), MathUtils.floor(a));
    }
    
    for (int i = 0; i < RAND_ITERS; i++) {
      float a = r.nextFloat() * MAX - MAX/2;
      assertEquals((int)Math.ceil(a), MathUtils.ceil(a));
    }
    
    for (int i = 0; i < RAND_ITERS; i++) {
      float a = r.nextFloat() * MAX - MAX/2;
      float b = r.nextFloat() * MAX - MAX/2;
      assertEquals(Math.max(a, b), MathUtils.max(a, b));
    }
    
    for (int i = 0; i < RAND_ITERS; i++) {
      float a = r.nextFloat() * MAX - MAX/2;
      float b = r.nextFloat() * MAX - MAX/2;
      assertEquals(Math.min(a, b), MathUtils.min(a, b));
    }
    
    for (int i = 0; i < RAND_ITERS; i++) {
      float a = r.nextFloat() * MAX - MAX/2;
      assertEquals(Math.round(a), MathUtils.round(a));
    }
    
    for (int i = 0; i < RAND_ITERS; i++) {
      float a = r.nextFloat() * MAX - MAX/2;
      assertEquals(Math.abs(a), MathUtils.abs(a));
    }
  }
}