Subsystem Reference

Reference description

Subsystem is a RefCounted object that groups related behavior and can expose a default command.

Fields

Field	Description	Example
`default_command`	Command automatically scheduled when subsystem is idle.	`movement.set_default_command(idle_move)`
`_init()`	Registers subsystem in scheduler.	Auto-called on construction
`_notification(NOTIFICATION_PREDELETE)`	Unregisters subsystem in scheduler.	Auto-called before free
`periodic(delta_time)`	Per-frame subsystem update hook (_process).	Updating coin counter
`physics_periodic(delta_time)`	Physics-step subsystem update hook (_physics_process).	Update kinematics

Methods

Name	Description	Argument	Example
`set_default_command(command)`	Sets or clears default command. Warns if command does not require this subsystem.	Required: `Command` or `null`	`set_default_command(idle_drive)`

Full example usage

class_name DriveSubsystem
extends Subsystem


func _init() -> void:
    var idle_drive := RunCommand.new(func(dt):
        # keep tiny stabilization logic here
        pass,
        [self]
    )
    set_default_command(idle_drive)

func periodic(delta_time: float) -> void:
    pass