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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,
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/**
 * Created at 8:41:50 PM Jan 23, 2011
 */
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.dynamics.World;
import org.jbox2d.testbed.framework.TestbedTest;

/**
 * @author Daniel Murphy
 */
public class DominoTower extends TestbedTest {
  final float dwidth = .20f;
  final float dheight = 1.0f;
  float ddensity;// = 10f;
  final float dfriction = 0.1f;
  int baseCount = 25;

  public void makeDomino(float x, float y, boolean horizontal, World world) {

    PolygonShape sd = new PolygonShape();
    sd.setAsBox(.5f * dwidth, .5f * dheight);
    FixtureDef fd = new FixtureDef();
    fd.shape = sd;
    fd.density = ddensity;
    BodyDef bd = new BodyDef();
    bd.type = BodyType.DYNAMIC;
    fd.friction = dfriction;
    fd.restitution = 0.65f;
    bd.position = new Vec2(x, y);
    bd.angle = horizontal ? (float) (Math.PI / 2.0) : 0f;
    Body myBody = getWorld().createBody(bd);
    myBody.createFixture(fd);
  }

  @Override
  public Vec2 getDefaultCameraPos() {
    return new Vec2(0,12);
  }
  
  @Override
  public boolean isSaveLoadEnabled() {
    return true;
  }

  @Override
  public void initTest(boolean argDeserialized) {
    if(argDeserialized){
      return;
    }

    { // Floor
      PolygonShape sd = new PolygonShape();
      sd.setAsBox(50.0f, 10.0f);

      BodyDef bd = new BodyDef();
      bd.position = new Vec2(0.0f, -10.0f);
      getWorld().createBody(bd).createFixture(sd, 0f);
    }

    {
      ddensity = 10f;
      // Make bullet
      PolygonShape sd = new PolygonShape();
      sd.setAsBox(.7f, .7f);
      FixtureDef fd = new FixtureDef();
      fd.density = 35f;
      BodyDef bd = new BodyDef();
      bd.type = BodyType.DYNAMIC;
      fd.shape = sd;
      fd.friction = 0f;
      fd.restitution = 0.85f;
      bd.bullet = true;
      // bd.addShape(sd);
      bd.position = new Vec2(30f, 50f);
      Body b = getWorld().createBody(bd);
      b.createFixture(fd);
      b.setLinearVelocity(new Vec2(-25f, -25f));
      b.setAngularVelocity(6.7f);

      fd.density = 25f;
      bd.position = new Vec2(-30, 25f);
      b = getWorld().createBody(bd);
      b.createFixture(fd);
      b.setLinearVelocity(new Vec2(35f, -10f));
      b.setAngularVelocity(-8.3f);
    }

    {
      float currX;
      // Make base
      for (int i = 0; i < baseCount; ++i) {
        currX = i * 1.5f * dheight - (1.5f * dheight * baseCount / 2f);
        makeDomino(currX, dheight / 2.0f, false, m_world);
        makeDomino(currX, dheight + dwidth / 2.0f, true, m_world);
      }
      currX = baseCount * 1.5f * dheight - (1.5f * dheight * baseCount / 2f);
      // Make 'I's
      for (int j = 1; j < baseCount; ++j) {
        if (j > 3)
          ddensity *= .8f;
        float currY = dheight * .5f + (dheight + 2f * dwidth) * .99f * j; // y at center of 'I'
                                                                          // structure

        for (int i = 0; i < baseCount - j; ++i) {
          currX = i * 1.5f * dheight - (1.5f * dheight * (baseCount - j) / 2f);// +
                                                                               // parent.random(-.05f,
                                                                               // .05f);
          ddensity *= 2.5f;
          if (i == 0) {
            makeDomino(currX - (1.25f * dheight) + .5f * dwidth, currY - dwidth, false, m_world);
          }
          if (i == baseCount - j - 1) {
            // if (j != 1) //djm: why is this here? it makes it off balance
            makeDomino(currX + (1.25f * dheight) - .5f * dwidth, currY - dwidth, false, m_world);
          }
          ddensity /= 2.5f;
          makeDomino(currX, currY, false, m_world);
          makeDomino(currX, currY + .5f * (dwidth + dheight), true, m_world);
          makeDomino(currX, currY - .5f * (dwidth + dheight), true, m_world);
        }
      }
    }
  }

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

}