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The testbed for JBox2D, a 2d java physics engine, ported from the C++ Box2d engine.
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/*******************************************************************************
 * 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
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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.dynamics.FixtureDef;
import org.jbox2d.testbed.framework.TestbedTest;

public class DominoTest extends TestbedTest {

  @Override
  public boolean isSaveLoadEnabled() {
    return true;
  }

  public void initTest(boolean argDeserialized) {
    if(argDeserialized){
      return;
    }
    
    { // Floor
      FixtureDef fd = new FixtureDef();
      PolygonShape sd = new PolygonShape();
      sd.setAsBox(50.0f, 10.0f);
      fd.shape = sd;

      BodyDef bd = new BodyDef();
      bd.position = new Vec2(0.0f, -10.0f);
      getWorld().createBody(bd).createFixture(fd);

    }

    { // Platforms
      for (int i = 0; i < 4; i++) {
        FixtureDef fd = new FixtureDef();
        PolygonShape sd = new PolygonShape();
        sd.setAsBox(15.0f, 0.125f);
        fd.shape = sd;

        BodyDef bd = new BodyDef();
        bd.position = new Vec2(0.0f, 5f + 5f * i);
        getWorld().createBody(bd).createFixture(fd);
      }
    }

    {
      FixtureDef fd = new FixtureDef();
      PolygonShape sd = new PolygonShape();
      sd.setAsBox(0.125f, 2f);
      fd.shape = sd;
      fd.density = 25.0f;

      BodyDef bd = new BodyDef();
      bd.type = BodyType.DYNAMIC;
      float friction = .5f;
      int numPerRow = 25;

      for (int i = 0; i < 4; ++i) {
        for (int j = 0; j < numPerRow; j++) {
          fd.friction = friction;
          bd.position = new Vec2(-14.75f + j * (29.5f / (numPerRow - 1)), 7.3f + 5f * i);
          if (i == 2 && j == 0) {
            bd.angle = -0.1f;
            bd.position.x += .1f;
          } else if (i == 3 && j == numPerRow - 1) {
            bd.angle = .1f;
            bd.position.x -= .1f;
          } else
            bd.angle = 0f;
          Body myBody = getWorld().createBody(bd);
          myBody.createFixture(fd);
        }
      }
    }
  }

  @Override
  public String getTestName() {
    return "Dominos";
  }
}