void BuildPlayerEntities(PrefabsDictionary prefabsDictionary)
{
//Building entities dynamically should be always preferred
//and MUST be used if an implementor doesn't need to be
//a Monobehaviour. You should strive to create implementors
//not as monobehaviours. Implementors as monobehaviours
//are meant only to function as bridge between Svelto.ECS
//and Unity3D. Using implementor as monobehaviour
//just to read serialized data from the editor, is also
//a bad practice, use a Json file instead.
var player = prefabsDictionary.Istantiate("Player");
List <IImplementor> implementors = new List <IImplementor>();
//fetching implementors as monobehaviours, used as bridge between
//Svelto.ECS and Unity3D
player.GetComponents(implementors);
//Add not monobehaviour implementors
implementors.Add(new PlayerInputImplementor());
implementors.Add(new PlayerHealthImplementor(100));
_entityFactory.BuildEntity <PlayerEntityDescriptor>(player.GetInstanceID(), implementors.ToArray());
//unluckily the gun is parented in the original prefab, so there is no easy way to create it
//explicitly, I have to create if from the existing gameobject.
var gun = player.GetComponentInChildren <PlayerShootingImplementor>();
_entityFactory.BuildEntity <PlayerGunEntityDescriptor>(gun.gameObject.GetInstanceID(), new object[] { gun });
}
void BuildPlayerEntities()
{
var prefabsDictionary = new PrefabsDictionary();
var player = prefabsDictionary.Istantiate("Player");
//Building entities explicitly should be always preferred
//and MUST be used if an implementor doesn't need to be
//a Monobehaviour. You should strive to create implementors
//not as monobehaviours. Implementors as monobehaviours
//are meant only to function as bridge between Svelto.ECS
//and Unity3D. Using implementor as monobehaviour
//just to read serialized data from the editor, is also
//a bad practice, use a Json file instead.
//The Player Entity is made of EntityViewStruct+Implementors as monobehaviours and
//EntityStructs. The PlayerInputDataStruct doesn't need to be initialized (yay!!)
//but the HealthEntityStruct does. Here I show the official method to do it
var initializer = _entityFactory.BuildEntity <PlayerEntityDescriptor>(player.GetInstanceID(), ECSGroups.Player, player.GetComponents <IImplementor>());
initializer.Init(new HealthEntityStruct {
currentHealth = 100
});
//unluckily the gun is parented in the original prefab, so there is no easy way to create it
//explicitly, I have to create if from the existing gameobject.
var gun = player.GetComponentInChildren <PlayerShootingImplementor>();
_entityFactory.BuildEntity <PlayerGunEntityDescriptor>(gun.gameObject.GetInstanceID(), ECSGroups.Player, new[] { gun });
}
/// <summary>
/// This is a standard approach to create Entities from already existing GameObject in the scene
/// It is absolutely not necessary, but convienent in case you prefer this way
/// </summary>
/// <param name="contextHolder"></param>
void ICompositionRoot.OnContextCreated(UnityContext contextHolder)
{
var prefabsDictionary = new PrefabsDictionary(Application.persistentDataPath + "/prefabs.json");
BuildEntitiesFromScene(contextHolder);
//Entities can also be created dynamically in run-time
//using the entityFactory; You can, if you wish, create
//starting entities here.
BuildPlayerEntities(prefabsDictionary);
BuildCameraEntity();
}