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class_name StateMachine
extends Node
const DEBUG: bool = false
var player: KinematicBody2D
var state: Node
var history: Array = []
func _ready() -> void:
player = get_parent()
state = get_child(0)
_enter_state()
func change_to(new_state: String) -> void:
history.append(state.name)
state = get_node(new_state)
_enter_state()
func back() -> void:
if history.size() > 0:
state = get_node(history.pop_back())
_enter_state()
func _enter_state() -> void:
if DEBUG:
print("Entering state %s" % state.name)
state.fsm = self
state.enter()
# routing game loop functions
func _process(delta: float) -> void:
if state.has_method("process"):
state.process(delta)
func _physics_process(delta: float) -> void:
if Input.is_action_pressed("move_left"):
player.rotate_to(player.LEFT)
if Input.is_action_pressed("move_right"):
player.rotate_to(player.RIGHT)
# state specific code, move_and_slide is called here
if state.has_method("physics_process"):
state.physics_process(delta)
handle_slow_speeds()
player.handle_time_elapsed(delta)
func slow_down_on_collisions(speed_backup: float):
if player.get_last_slide_collision():
Global.SNAKE_SPEED = player.velocity.length()
else:
Global.SNAKE_SPEED = speed_backup
func handle_slow_speeds() -> void:
if Global.SNAKE_SPEED <= Global.SNAKE_SPEED_BACKUP / 4.0:
Global.SNAKE_SPEED = Global.SNAKE_SPEED_BACKUP
Event.emit_signal("game_over")
func _input(event: InputEvent) -> void:
if state.has_method("input"):
state.input(event)
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