/// Set the active state of the body. An inactive body is not
/// simulated and cannot be collided with or woken up.
/// If you pass a flag of true, all fixtures will be added to the
/// broad-phase.
/// If you pass a flag of false, all fixtures will be removed from
/// the broad-phase and all contacts will be destroyed.
/// Fixtures and joints are otherwise unaffected. You may continue
/// to create/destroy fixtures and joints on inactive bodies.
/// Fixtures on an inactive body are implicitly inactive and will
/// not participate in collisions, ray-casts, or queries.
/// Joints connected to an inactive body are implicitly inactive.
/// An inactive body is still owned by a b2World object and remains
/// in the body list.
public void SetActive(bool flag)
{
if (flag == IsActive())
{
return;
}
if (flag)
{
_flags |= BodyFlags.Active;
// Create all proxies.
BroadPhase broadPhase = _world._contactManager._broadPhase;
for (Fixture f = _fixtureList; f != null; f = f._next)
{
f.CreateProxy(broadPhase, ref _xf);
}
// Contacts are created the next time step.
}
else
{
_flags &= ~BodyFlags.Active;
// Destroy all proxies.
BroadPhase broadPhase = _world._contactManager._broadPhase;
for (Fixture f = _fixtureList; f != null; f = f._next)
{
f.DestroyProxy(broadPhase);
}
// Destroy the attached contacts.
ContactEdge ce = _contactList;
while (ce != null)
{
ContactEdge ce0 = ce;
ce = ce.Next;
_world._contactManager.Destroy(ce0.Contact);
}
_contactList = null;
}
}
/// Creates a fixture and attach it to this body. Use this function if you need
/// to set some fixture parameters, like friction. Otherwise you can create the
/// fixture directly from a shape.
/// If the density is non-zero, this function automatically updates the mass of the body.
/// Contacts are not created until the next time step.
/// @param def the fixture definition.
/// @warning This function is locked during callbacks.
public Fixture CreateFixture(FixtureDef def)
{
Debug.Assert(_world.IsLocked == false);
if (_world.IsLocked == true)
{
return(null);
}
Fixture fixture = new Fixture();
fixture.Create(this, def);
if ((_flags & BodyFlags.Active) == BodyFlags.Active)
{
BroadPhase broadPhase = _world._contactManager._broadPhase;
fixture.CreateProxy(broadPhase, ref _xf);
}
fixture._next = _fixtureList;
_fixtureList = fixture;
++_fixtureCount;
fixture._body = this;
// Adjust mass properties if needed.
if (fixture._density > 0.0f)
{
ResetMassData();
}
// Let the world know we have a new fixture. This will cause new contacts
// to be created at the beginning of the next time step.
_world._flags |= WorldFlags.NewFixture;
return(fixture);
}
/// <summary>
/// Creates a fixture and attach it to this body. Use this function if you need
/// to set some fixture parameters, like friction. Otherwise you can create the
/// fixture directly from a shape.
/// If the density is non-zero, this function automatically updates the mass of the body.
/// Contacts are not created until the next time step.
/// @warning This function is locked during callbacks.
/// </summary>
/// <param name="def">the fixture definition.</param>
/// <returns></returns>
public Fixture CreateFixture(FixtureDef def)
{
Debug.Assert(_world.IsLocked == false);
if (_world.IsLocked == true)
{
return null;
}
Fixture fixture = new Fixture();
fixture.Create(this, def);
if ((_flags & BodyFlags.Active) == BodyFlags.Active)
{
BroadPhase broadPhase = _world._contactManager._broadPhase;
fixture.CreateProxy(broadPhase, ref _xf);
}
fixture._next = _fixtureList;
_fixtureList = fixture;
++_fixtureCount;
fixture._body = this;
// Adjust mass properties if needed.
if (fixture._density > 0.0f)
{
ResetMassData();
}
// Let the world know we have a new fixture. This will cause new contacts
// to be created at the beginning of the next time step.
_world._flags |= WorldFlags.NewFixture;
return fixture;
}
