Handling game logic events by behavior components
- by chehob
My question continues on topic discussed here
I have tried implementing attribute/behavior design
and here is a quick example demonstrating the issue.
class HealthAttribute : public ActorAttribute
{
public:
HealthAttribute( float val ) : mValue( val ) { }
float Get( void ) const { return mValue; }
void Set( float val ) { mValue = val; }
private:
float mValue;
};
class HealthBehavior : public ActorBehavior
{
public:
HealthBehavior( shared_ptr< HealthAttribute > health )
: pHealth( health )
{
// Set OnDamage() to listen for game logic event "DamageEvent"
}
void OnDamage( IEventDataPtr pEventData )
{
// Check DamageEvent target entity
// ( compare my entity ID with event's target entity ID )
// If not my entity, do nothing
// Else, modify health attribute with received DamageEvent data
}
protected:
shared_ptr< HealthAttribute > pHealth;
};
My question - is it possible to get rid of this annoying check for game logic events?
In the current implementation when some entity must receive damage, game logic just fires off event that contains damage value and the entity id which should receive that damage.
And all HealthBehaviors are subscribed to the DamageEvent type, which leads to any entity possesing HealthBehavior call OnDamage() even if he is not the addressee.
