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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)
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/**
 * Created at 2:04:52 PM Jan 23, 2011
 */
package org.jbox2d.testbed.tests;

import org.jbox2d.collision.shapes.CircleShape;
import org.jbox2d.collision.shapes.EdgeShape;
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.Fixture;
import org.jbox2d.testbed.framework.TestbedSettings;
import org.jbox2d.testbed.framework.TestbedTest;

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

  Body m_body;
  Fixture m_fixture1;
  Fixture m_fixture2;

  @Override
  public void initTest(boolean argDeserialized) {
    {
      BodyDef bd = new BodyDef();
      Body ground = getWorld().createBody(bd);

      EdgeShape shape = new EdgeShape();
      shape.set(new Vec2(-40.0f, 0.0f), new Vec2(40.0f, 0.0f));
      ground.createFixture(shape, 0.0f);
    }

    BodyDef bd = new BodyDef();
    bd.type = BodyType.DYNAMIC;
    bd.position.set(0.0f, 10.0f);
    m_body = getWorld().createBody(bd);

    PolygonShape shape = new PolygonShape();
    shape.setAsBox(4.0f, 4.0f, new Vec2(0.0f, 0.0f), 0.0f);
    m_fixture1 = m_body.createFixture(shape, 10.0f);

    m_fixture2 = null;
  }

  @Override
  public void keyPressed(char key, int argKeyCode) {
    switch (key) {
      case 'c':
        if (m_fixture2 == null) {
          CircleShape shape = new CircleShape();
          shape.m_radius = 3.0f;
          shape.m_p.set(0.5f, -4.0f);
          m_fixture2 = m_body.createFixture(shape, 10.0f);
          m_body.setAwake(true);
        }
        break;

      case 'd':
        if (m_fixture2 != null) {
          m_body.destroyFixture(m_fixture2);
          m_fixture2 = null;
          m_body.setAwake(true);
        }
        break;
    }
  }

  @Override
  public void step(TestbedSettings settings) {
    super.step(settings);
    addTextLine("Press: (c) create a shape, (d) destroy a shape.");
  }

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