Java Code Examples for org.jbox2d.dynamics.contacts.Contact#getFixtureA()

@Override
public void beginContact(Contact cp) {
    // TODO Auto-generated method stub
    Fixture f1 = cp.getFixtureA();
    Fixture f2 = cp.getFixtureB();

    // Get both bodies
    Body b1 = f1.getBody();
    Body b2 = f2.getBody();

    // Get objects that reference these bodies
    Object o1 = b1.getUserData();
    Object o2 = b2.getUserData();

    if ((o1.getClass() == Maze.class && o2.getClass() == Ball.class) || (o1.getClass() == Ball.class && o2.getClass() == Maze.class)) { //if ball touches maze
        balltosurfacecontact(); //play sound
    }

}
 

@Override
public void preSolve(Contact contact, Manifold oldManifold) {
  super.preSolve(contact, oldManifold);

  Fixture fixtureA = contact.getFixtureA();
  Fixture fixtureB = contact.getFixtureB();

  if (fixtureA != m_platform && fixtureA != m_character) {
    return;
  }

  if (fixtureB != m_character && fixtureB != m_character) {
    return;
  }

  Vec2 position = m_character.getBody().getPosition();

  if (position.y < m_top + m_radius - 3.0f * Settings.linearSlop) {
    contact.setEnabled(false);
  }
}
 

/**
 * Call this if you want to establish collision that was previously disabled by
 * ContactFilter::ShouldCollide.
 */
public void refilter() {
  if (m_body == null) {
    return;
  }

  // Flag associated contacts for filtering.
  ContactEdge edge = m_body.getContactList();
  while (edge != null) {
    Contact contact = edge.contact;
    Fixture fixtureA = contact.getFixtureA();
    Fixture fixtureB = contact.getFixtureB();
    if (fixtureA == this || fixtureB == this) {
      contact.flagForFiltering();
    }
    edge = edge.next;
  }

  World world = m_body.getWorld();

  if (world == null) {
    return;
  }

  // Touch each proxy so that new pairs may be created
  BroadPhase broadPhase = world.m_contactManager.m_broadPhase;
  for (int i = 0; i < m_proxyCount; ++i) {
    broadPhase.touchProxy(m_proxies[i].proxyId);
  }
}
 

public void pushContact(Contact contact) {
  Fixture fixtureA = contact.getFixtureA();
  Fixture fixtureB = contact.getFixtureB();

  if (contact.m_manifold.pointCount > 0 && !fixtureA.isSensor() && !fixtureB.isSensor()) {
    fixtureA.getBody().setAwake(true);
    fixtureB.getBody().setAwake(true);
  }

  ShapeType type1 = fixtureA.getType();
  ShapeType type2 = fixtureB.getType();

  IDynamicStack<Contact> creator = contactStacks[type1.ordinal()][type2.ordinal()].creator;
  creator.push(contact);
}
 

@Override
public void preSolve(Contact contact, Manifold oldManifold) {
  super.preSolve(contact, oldManifold);

  Fixture fixtureA = contact.getFixtureA();
  Fixture fixtureB = contact.getFixtureB();

  if (fixtureA == m_platform || fixtureB == m_platform) {
    contact.setTangentSpeed(5.0f);
  }
}
 

public void preSolve(Contact contact, Manifold oldManifold) {
  Manifold manifold = contact.getManifold();

  if (manifold.pointCount == 0) {
    return;
  }

  Fixture fixtureA = contact.getFixtureA();
  Fixture fixtureB = contact.getFixtureB();

  Collision.getPointStates(state1, state2, oldManifold, manifold);

  contact.getWorldManifold(worldManifold);

  for (int i = 0; i < manifold.pointCount && pointCount < MAX_CONTACT_POINTS; i++) {
    ContactPoint cp = points[pointCount];
    cp.fixtureA = fixtureA;
    cp.fixtureB = fixtureB;
    cp.position.set(worldManifold.points[i]);
    cp.normal.set(worldManifold.normal);
    cp.state = state2[i];
    cp.normalImpulse = manifold.points[i].normalImpulse;
    cp.tangentImpulse = manifold.points[i].tangentImpulse;
    cp.separation = worldManifold.separations[i];
    ++pointCount;
  }
}
 

/**
 * Destroy a fixture. This removes the fixture from the broad-phase and destroys all contacts
 * associated with this fixture. This will automatically adjust the mass of the body if the body
 * is dynamic and the fixture has positive density. All fixtures attached to a body are implicitly
 * destroyed when the body is destroyed.
 * 
 * @param fixture the fixture to be removed.
 * @warning This function is locked during callbacks.
 */
public final void destroyFixture(Fixture fixture) {
  assert (m_world.isLocked() == false);
  if (m_world.isLocked() == true) {
    return;
  }

  assert (fixture.m_body == this);

  // Remove the fixture from this body's singly linked list.
  assert (m_fixtureCount > 0);
  Fixture node = m_fixtureList;
  Fixture last = null; // java change
  boolean found = false;
  while (node != null) {
    if (node == fixture) {
      node = fixture.m_next;
      found = true;
      break;
    }
    last = node;
    node = node.m_next;
  }

  // You tried to remove a shape that is not attached to this body.
  assert (found);

  // java change, remove it from the list
  if (last == null) {
    m_fixtureList = fixture.m_next;
  } else {
    last.m_next = fixture.m_next;
  }

  // Destroy any contacts associated with the fixture.
  ContactEdge edge = m_contactList;
  while (edge != null) {
    Contact c = edge.contact;
    edge = edge.next;

    Fixture fixtureA = c.getFixtureA();
    Fixture fixtureB = c.getFixtureB();

    if (fixture == fixtureA || fixture == fixtureB) {
      // This destroys the contact and removes it from
      // this body's contact list.
      m_world.m_contactManager.destroy(c);
    }
  }

  if ((m_flags & e_activeFlag) == e_activeFlag) {
    BroadPhase broadPhase = m_world.m_contactManager.m_broadPhase;
    fixture.destroyProxies(broadPhase);
  }

  fixture.destroy();
  fixture.m_body = null;
  fixture.m_next = null;
  fixture = null;

  --m_fixtureCount;

  // Reset the mass data.
  resetMassData();
}
 

public void destroy(Contact c) {
  Fixture fixtureA = c.getFixtureA();
  Fixture fixtureB = c.getFixtureB();
  Body bodyA = fixtureA.getBody();
  Body bodyB = fixtureB.getBody();

  if (m_contactListener != null && c.isTouching()) {
    m_contactListener.endContact(c);
  }

  // Remove from the world.
  if (c.m_prev != null) {
    c.m_prev.m_next = c.m_next;
  }

  if (c.m_next != null) {
    c.m_next.m_prev = c.m_prev;
  }

  if (c == m_contactList) {
    m_contactList = c.m_next;
  }

  // Remove from body 1
  if (c.m_nodeA.prev != null) {
    c.m_nodeA.prev.next = c.m_nodeA.next;
  }

  if (c.m_nodeA.next != null) {
    c.m_nodeA.next.prev = c.m_nodeA.prev;
  }

  if (c.m_nodeA == bodyA.m_contactList) {
    bodyA.m_contactList = c.m_nodeA.next;
  }

  // Remove from body 2
  if (c.m_nodeB.prev != null) {
    c.m_nodeB.prev.next = c.m_nodeB.next;
  }

  if (c.m_nodeB.next != null) {
    c.m_nodeB.next.prev = c.m_nodeB.prev;
  }

  if (c.m_nodeB == bodyB.m_contactList) {
    bodyB.m_contactList = c.m_nodeB.next;
  }

  // Call the factory.
  pool.pushContact(c);
  --m_contactCount;
}