void Level::addPlatform(const b2AABB& platform)
{
b2BodyDef platformBodyDef;
platformBodyDef.position = platform.GetCenter();
b2Body* platformBody = mWorld->CreateBody(&platformBodyDef);
platformBody->SetType(b2_staticBody);
b2PolygonShape platformBox;
b2Vec2 platformHalfSize = platform.GetExtents();
platformBox.SetAsBox(platformHalfSize.x, platformHalfSize.y);
platformBody->CreateFixture(&platformBox, 0.f);
}
// Create a proxy in the tree as a leaf node. We return the index
// of the node instead of a pointer so that we can grow
// the node pool.
uint16 b2DynamicTree::CreateProxy(const b2AABB& aabb, void* userData)
{
uint16 node = AllocateNode();
// Fatten the aabb.
b2Vec2 center = aabb.GetCenter();
b2Vec2 extents = b2_fatAABBFactor * aabb.GetExtents();
m_nodes[node].aabb.lowerBound = center - extents;
m_nodes[node].aabb.upperBound = center + extents;
m_nodes[node].userData = userData;
InsertLeaf(node);
return node;
}
void b2DynamicTree::MoveProxy(uint16 proxyId, const b2AABB& aabb)
{
b2Assert(proxyId < m_nodeCount);
b2Assert(m_nodes[proxyId].IsLeaf());
if (m_nodes[proxyId].aabb.Contains(aabb))
{
return;
}
RemoveLeaf(proxyId);
b2Vec2 center = aabb.GetCenter();
b2Vec2 extents = b2_fatAABBFactor * aabb.GetExtents();
m_nodes[proxyId].aabb.lowerBound = center - extents;
m_nodes[proxyId].aabb.upperBound = center + extents;
InsertLeaf(proxyId);
}
