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The testbed for JBox2D, a 2d java physics engine, ported from the C++ Box2d engine.
There is a newer version: 2.2.1.1
/*******************************************************************************
 * Copyright (c) 2013, 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.
 * 
 * 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 THE COPYRIGHT HOLDER OR CONTRIBUTORS 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 5:36:06 PM Jul 17, 2010
 */
package org.jbox2d.testbed.tests;

import org.jbox2d.collision.shapes.PolygonShape;
import org.jbox2d.common.Vec2;
import org.jbox2d.dynamics.Body;
import org.jbox2d.dynamics.BodyDef;
import org.jbox2d.dynamics.BodyType;
import org.jbox2d.testbed.framework.TestbedTest;

/**
 * @author Daniel Murphy
 */
public class PyramidTest extends TestbedTest {
	
  @Override
  public boolean isSaveLoadEnabled() {
    return true;
  }
  
	/**
	 * @see org.jbox2d.testbed.framework.TestbedTest#initTest(boolean)
	 */
	@Override
	public void initTest(boolean argDeserialized) {
	  if(argDeserialized){
	    return;
	  }
		setTitle("Pyramid");
		int count = 20;
		{
			BodyDef bd = new BodyDef();
			Body ground = getWorld().createBody(bd);

			PolygonShape shape = new PolygonShape();
			shape.setAsEdge(new Vec2(-40.0f, 0f), new Vec2(40.0f, 0f));
			ground.createFixture(shape, 0.0f);
			
//			CircleShape cs = new CircleShape();
//			cs.m_radius = 8.0f;
//			cs.m_p.set(-0.3f,-8.0f);
//			Fixture f = ground.createFixture(cs, 0.0f);
//			f.setFriction(0.0f);
			
		}

		{
			float a = .5f;
			PolygonShape shape = new PolygonShape();
			shape.setAsBox(a, a);
			
			Vec2 x = new Vec2(-7.0f, 0.75f);
			Vec2 y = new Vec2();
			Vec2 deltaX = new Vec2(0.5625f, 1.25f);
			Vec2 deltaY = new Vec2(1.125f, 0.0f);

			for (int i = 0; i < count; ++i){
				y.set(x);

				for (int j = i; j < count; ++j){
					BodyDef bd = new BodyDef();
					bd.type = BodyType.DYNAMIC;
					bd.position.set(y);
					Body body = getWorld().createBody(bd);
					body.createFixture(shape, 5.0f);
					y.addLocal(deltaY);
				}

				x.addLocal(deltaX);
			}
		}
	}

	/**
	 * @see org.jbox2d.testbed.framework.TestbedTest#getTestName()
	 */
	@Override
	public String getTestName() {
		return "Pyramid";
	}

}