/**
* 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 World object and remains in
* the body list.
*
* @param flag
*/
public void setActive(boolean flag) {
if (flag == isActive()) {
return;
}
if (flag) {
m_flags |= e_activeFlag;
// Create all proxies.
BroadPhase broadPhase = m_world.m_contactManager.m_broadPhase;
for (Fixture f = m_fixtureList; f != null; f = f.m_next) {
f.createProxy(broadPhase, m_xf);
}
// Contacts are created the next time step.
} else {
m_flags &= ~e_activeFlag;
// Destroy all proxies.
BroadPhase broadPhase = m_world.m_contactManager.m_broadPhase;
for (Fixture f = m_fixtureList; f != null; f = f.m_next) {
f.destroyProxy(broadPhase);
}
// Destroy the attached contacts.
ContactEdge ce = m_contactList;
while (ce != null) {
ContactEdge ce0 = ce;
ce = ce.next;
m_world.m_contactManager.destroy(ce0.contact);
}
m_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 final Fixture createFixture(FixtureDef def) {
assert (m_world.isLocked() == false);
if (m_world.isLocked() == true) {
return null;
}
// djm TODO from pool?
Fixture fixture = new Fixture();
fixture.create(this, def);
if ((m_flags & e_activeFlag) == e_activeFlag) {
BroadPhase broadPhase = m_world.m_contactManager.m_broadPhase;
fixture.createProxy(broadPhase, m_xf);
}
fixture.m_next = m_fixtureList;
m_fixtureList = fixture;
++m_fixtureCount;
fixture.m_body = this;
// Adjust mass properties if needed.
if (fixture.m_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.
m_world.m_flags |= World.NEW_FIXTURE;
return fixture;
}