By now, we have defined only the clWanderBehaviour class. To implement flocking algorithms, we need to store information about all the boids at once. Such a collection is called a Swarm here. The clSwarm class holds a vector of clBoid objects and implements a number of routines used in boid control calculations:
class clSwarm: public iIntrusiveCounter
{
public:
std::vector< clPtr<clBoid> > m_Boids;
clSwarm() {}For debugging and visual demonstration purposes, the GenerateRandom() method allocates a number of clBoid objects with random positions and zero velocities:
void GenerateRandom( size_t N )
{
m_Boids.reserve( N );
for ( size_t i = 0; i != N; i++ )
{
m_Boids.emplace_back( make_intrusive<clBoid>() );By default, each boid has a Wandering behavior:
m_Boids.back()->m_Behaviour = make_intrusive<clWanderBehaviour>();
m_Boids.back()->m_Swarm = this;Positions are random and are also kept within the -1..+1 range...