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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)
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/**
 * Created at 12:12:33 AM Jan 22, 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.joints.LineJointDef;
import org.jbox2d.testbed.framework.TestbedTest;

/**
 * @author Daniel Murphy
 */
public class LineJointTest extends TestbedTest {

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

  @Override
  public void initTest(boolean argDeserialized) {
    if (argDeserialized) {
      return;
    }
    Body ground = null;
    {
      PolygonShape shape = new PolygonShape();
      shape.setAsEdge(new Vec2(-40.0f, 0.0f), new Vec2(40.0f, 0.0f));

      BodyDef bd = new BodyDef();
      ground = getWorld().createBody(bd);
      ground.createFixture(shape, 0.0f);
    }

    {
      PolygonShape shape = new PolygonShape();
      shape.setAsBox(0.5f, 2.0f);

      BodyDef bd = new BodyDef();
      bd.type = BodyType.DYNAMIC;
      bd.position.set(0.0f, 7.0f);
      Body body = getWorld().createBody(bd);
      body.createFixture(shape, 1.0f);

      LineJointDef jd = new LineJointDef();
      Vec2 axis = new Vec2(2.0f, 1.0f);
      axis.normalize();
      jd.initialize(ground, body, new Vec2(0.0f, 8.5f), axis);
      jd.motorSpeed = 0.0f;
      jd.maxMotorForce = 100.0f;
      jd.enableMotor = true;
      jd.lowerTranslation = -4.0f;
      jd.upperTranslation = 4.0f;
      jd.enableLimit = true;
      getWorld().createJoint(jd);
    }
  }

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