/// <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;
}