Surface.cpp

void Surface::listFriendlyEntities(const MapPosition& position,
                                   ForceID forceID,
                                   double maxDistance,
                                   std::vector<EntityWithOwner*>& result,
                                   bool onlyUnits)
{
  BoundingBox searchingBox(-maxDistance, -maxDistance, maxDistance, maxDistance);
  searchingBox += position;
  ChunkPosition leftTop(TilePosition(searchingBox.leftTop));
  ChunkPosition rightBottom(TilePosition(searchingBox.rightBottom));
  const auto collaborators = this->map.forceManager.getCollaborators(forceID);

  for (ChunkPosition chunkPosition(leftTop.x, 0); chunkPosition.x <= rightBottom.x; chunkPosition.x++)
    for (chunkPosition.y = leftTop.y; chunkPosition.y <= rightBottom.y; chunkPosition.y++)
    {
      Chunk& chunk = this->getChunk(chunkPosition);
      for (ForceID otherForceID : collaborators)
        if (auto militaryTargets = chunk.getMilitaryTargetsOptional(otherForceID))
          for (EntityWithOwner& entity : *militaryTargets)
            if (position.distanceSquared(entity.position) < maxDistance * maxDistance &&
                (!onlyUnits || entity.isUnit()))
              result.push_back(&entity);
    }

}