public void RemoveSystem(AbstractSystem system)
{
SystemRemoved(system);
systems.Remove(system);
// @Hack If a system is created with the same group as a group listener there's going to be problems
//groupMembership.Remove(system.Group);
}
public void AddSystem(AbstractSystem system)
{
system.Engine = this;
systems.Add(system);
// This will throw an error if a group already exists but thats OK
// because we don't want people adding multiple systems with the same
// group. It doesn't make sense and it adds unnecessary complications.
if (!groupMembership.ContainsKey(system.Group))
{
groupMembership.Add(system.Group, new List <Entity>());
}
//groupMembership.Add(system.Group, new List<Entity>());
system.AddedToEngine();
SystemAdded(system);
}
// This method goes through all the entities in the Engine and adds them
// to the group if they match.
private void UpdateEntityMembership(AbstractSystem system)
{
var group = system.Group;
if (!groupMembership.ContainsKey(group))
{
return;
}
// Clear so we don't add duplicates
groupMembership[group].Clear();
foreach (Entity entity in entities.Values)
{
if (group.Matches(entity))
{
groupMembership[group].Add(entity);
}
}
}