/// <summary>Creates a deep copy of the object, reusing the given object.</summary>
/// <param name="into">The object to copy into.</param>
/// <returns>The copy.</returns>
public void CopyInto(IManager into)
{
// Validate input.
if (into == this)
{
throw new ArgumentException("Cannot copy a manager into itself.");
}
// Get the properly typed version.
var copy = (Manager)into;
// Copy id managers.
_entityIds.CopyInto(copy._entityIds);
_componentIds.CopyInto(copy._componentIds);
// Copy components and entities.
copy._components.Clear();
foreach (var component in _componentIds.Select(id => _components[id]))
{
// The create the component and set it up.
var componentCopy = AllocateComponent(component.GetType()).Initialize(component);
componentCopy.Id = component.Id;
componentCopy.Entity = component.Entity;
componentCopy.Manager = copy;
copy._components[componentCopy.Id] = componentCopy;
}
copy._entities.Clear();
foreach (var entity in _entityIds)
{
// Create copy.
var entityCopy = AllocateEntity();
copy._entities[entity] = entityCopy;
// Assign copied components.
foreach (var component in _entities[entity].Components)
{
entityCopy.Add(copy.GetComponentById(component.Id));
}
}
// Copy systems after copying components so they can fetch their
// components again.
foreach (var system in _systems
.Where(system => !system.GetType().IsDefined(typeof(PresentationOnlyAttribute), true)))
{
copy.CopySystem(system);
}
// All done, send message to allow post-processing.
Initialize message;
SendMessage(message);
}
