14. EntityManager/** Manage all entity ids, and it's components */
class EntityManager:public Object
{
public:
EntityManager();
~EntityManager();
entity_id_type generateNewEid();
Entity* createEntity();
void removeEntity(Entity* entity);
void addComponentToEntity(ECSComponent* component,Entity* entity);
/** an entity only can own one instane of some kind of component */
ECSComponent* getComponentForEntity(const std::string & eId,Entity* entity);
/** get all entities which contain some kind of component. */
const std::vector<Entity*>* getAllEntitiesPosessingComponent(const std::string& cId);
private:
std::vector<Entity*> _entities;
std::map<std::string, std::map<Entity*, ECSComponent*>*> _componentsByType;
//for quick find entities every frame.
std::map<std::string, std::vector<Entity*>*> _componentEntities;
int _lowestUnassignedEid;
};
15.
16. System
System
System
System Entity Entity
CollisionSystem, AISystem, MoveSystem, InputSystem, BattleSystem,
CameraSystem...
Code...
class ECSSystem:public Object
{
protected:
ECSSystem();
void initWithManager(EntityManager*);
public:
virtual void configure(){};
virtual void update(float dt){};
protected:
EntityManager* _entityManager;
};
