Vec2 SteeringForce::Hide(const Vehicle *target, std::vector<Vehicle *> &obstacles)
{
double DistToClosest = MAXFLOAT;
Vec2 BestHidingSpot;
std::vector<Vehicle*>::iterator curOb = obstacles.begin();
while (curOb!=obstacles.end()) {
if (*curOb!=target && *curOb != m_pVehicle) {
//计算这个障碍物的hide地点
Vec2 HidingSpot = GetHidingPosition((*curOb)->getPosition(), (*curOb)->getContentSize().width/2, target->getPosition());
double dist = HidingSpot.distance(m_pVehicle->getPosition());
if (dist <DistToClosest) {
DistToClosest = dist;
BestHidingSpot = HidingSpot;
}
}
++curOb;
}
if (DistToClosest == MAXFLOAT) {
return Evade(target);
}
return Arrive(BestHidingSpot, fast);
}
//--------------------------- Hide ---------------------------------------
//
//------------------------------------------------------------------------
Vector2D SteeringBehavior::Hide()
{
double DistToClosest = MaxDouble;
Vector2D BestHidingSpot;
std::set<Obstacle*>::const_iterator curOb = Obstacle::getAll().begin();
std::set<Obstacle*>::const_iterator closest;
while(curOb != Obstacle::getAll().end())
{
//calculate the position of the hiding spot for this obstacle
Vector2D HidingSpot = GetHidingPosition((*curOb)->Pos(),
(*curOb)->BRadius(),
hideTarget->Pos());
//work in distance-squared space to find the closest hiding
//spot to the agent
double dist = Vec2DDistanceSq(HidingSpot, m_pMovingEntity->Pos());
if (dist < DistToClosest)
{
DistToClosest = dist;
BestHidingSpot = HidingSpot;
closest = curOb;
}
++curOb;
}//end while
//if no suitable obstacles found then Evade the hunter
if (DistToClosest == MaxFloat)
{
return Flee(hideTarget->Pos());
}
//else use Arrive on the hiding spot
return Arrive(BestHidingSpot, fast);
}