Godot Version
Godot 4.3
Question
I am creating a behavior tree for a base enemy scene. It’s organized by one state machine with a few child state nodes under it.
So for the Patrol and Aggressive states, they transition to other states well. But, I am finding that the Attack state is having trouble with it. I am not making much progress on it, so I need help finding why the state doesn’t change.
The state machine has a function, change_state(new_state), that calls upon the exit function of the previous state and the enter function of the new state.
class_name State_Machine
extends Node
signal transitioned(state)
@export var starting_state: State
var current_state: State
func init(parent: Node3D) -> void:
for child in get_children():
child.parent = parent
change_state(starting_state)
func change_state(new_state: State) -> void:
if current_state:
current_state.exit()
current_state = new_state
current_state.enter()
transitioned.emit(current_state)
The attack state inherits an abstract state class with empty functions to be filled by custom logic
extends State
signal attack(data: Attack_Stats)
@export var attack_data: Attack_Stats
@export var next_attack: State
@export var return_state: State
@onready var state_machine = get_parent()
func enter() -> void:
print_debug("attacking player");
change_anim.emit(attack_data.animation_name)
play_audio.emit(attack_data.SFX)
attack.emit(attack_data)
func _on_animation_player_animation_finished(anim_name: StringName) -> void:
if anim_name == attack_data.animation_name:
# Grab the new player position
var player_position = parent.player_target.global_position
# if close enough try another attack
if parent.check_target_reached(player_position):
state_machine.change_state(next_attack)
# if not close enough then change state
else:
state_machine.change_state(return_state)
And in testing, once the attack animation is over, it should transition to itself or transition to the aggressive state in the tree. I could call the enter function, but I want to leave room to create child states that handle other attacks that could come next in a combo.
So is there anything people can notice about the code that may cause a failure in changing states?
