public Engagement(IBoid host)
{
_host = host;
_flockers = new List <IBoid>();
_ahead = new Boid();
_ahead._position = _host._Position;
_ahead._velocity = _host._Velocity;
_ahead._maxVelocity = _host._MaxVelocity;
_arrive = new Arrive(_host);
_evade = new Evade(_host);
_separation = new Separation(_host);
_arrive._target = _target;
_evade._target = _ahead;
_separation._boids = _flockers;
_separation._RADIUS = 1.0f;
_separation._WEIGHT = 0.75f;
}