/// <summary>
/// Gets the entities.
/// </summary>
/// <param name="aspect">The aspect.</param>
/// <returns>The filled Bag{Entity}.</returns>
public Bag <Entity> GetEntities(Aspect aspect)
{
Bag <Entity> entitiesBag = new Bag <Entity>();
for (int index = 0; index < this.ActiveEntities.Count; ++index)
{
Entity entity = this.ActiveEntities.Get(index);
if (entity != null &&
aspect.Interests(entity))
{
entitiesBag.Add(entity);
}
}
return(entitiesBag);
}
/// <summary>
/// Sets the system.
/// </summary>
/// <param name="layers">The layers.</param>
/// <param name="system">The system.</param>
/// <param name="layer">The layer.</param>
/// <param name="executionType">Type of the execution.</param>
private static void SetSystem(
ref IDictionary <int, SystemLayer> layers,
EntitySystem system,
int layer,
ExecutionType executionType)
{
if (!layers.ContainsKey(layer))
{
layers[layer] = new SystemLayer();
}
Bag <EntitySystem> updateBag = layers[layer][executionType];
if (!updateBag.Contains(system))
{
updateBag.Add(system);
}
layers = (from d in layers orderby d.Key ascending select d).ToDictionary(keySelector: pair => pair.Key, elementSelector: pair => pair.Value);
}
/// <summary>
/// Get all components assigned to an entity.
/// </summary>
/// <param name="entity">Entity for which you want the components.</param>
/// <returns>Bag of components</returns>
public Bag <IEntityComponent> GetComponents(Entity entity)
{
Debug.Assert(entity != null, "Entity must not be null.");
//Debug.Assert(entity.entityManager == this, ""); // TODO
Bag <IEntityComponent> entityComponents = new Bag <IEntityComponent>();
int entityId = entity.Index;
for (int index = 0, b = this.componentsByType.Count; b > index; ++index)
{
Bag <IEntityComponent> components = this.componentsByType.Get(index);
if (components != null &&
entityId < components.Count)
{
IEntityComponent component = components.Get(entityId);
if (component != null)
{
entityComponents.Add(component);
}
}
}
return(entityComponents);
}