Platformer 2.0

player/player_controller.gd

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+extends CharacterBody2D
+
+@export var gravity = 900.0
+
+var movement_fsm: StateMachine
+@onready var animation_player: AnimationPlayer = $AnimationPlayer
+
+var FSMSetup = preload("res://player/setup_state.gd")
+var movement_states: Array[State] = []
+var movement_transitions: Array[StateTransition] = []
+var movement_init_state: StringName = &"idle"
+
+func _ready() -> void:
+	movement_states = FSMSetup.build_states()
+	movement_transitions = FSMSetup.build_transitions()
+
+	movement_fsm = StateMachine.new()
+	movement_fsm.setup(movement_states, movement_transitions, movement_init_state)
+	if movement_fsm.current_state:
+		movement_fsm.current_state.enter(self)
+
+
+func _physics_process(delta: float) -> void:
+	if(movement_fsm):
+		movement_fsm.process(self, delta)
+	print("Current state: %s" % movement_fsm.current_state.id)
+
+func play_animation(anim_name: String) -> void:
+	if animation_player == null:
+		push_warning("State '%s': player_anims is null, cannot play '%s'" % [movement_fsm.current_state.id, anim_name])
+		return
+	# TODO:
+	# null checks: no sprite frames
+	# no animation by name
+
+	if animation_player.current_animation != anim_name:
+		animation_player.play(anim_name)

player/player_controller.gd.uid

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+uid://bcipombqbxffa

player/setup_state.gd

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+extends Resource
+
+static var IdleState = preload("res://player/states/idle.gd")
+static var FallState = preload("res://player/states/fall.gd")
+
+static func build_states() -> Array[State]:
+	var list: Array[State] = []
+	list.append(_named(IdleState.new(), &"idle"))
+	list.append(_named(FallState.new(), &"fall"))
+	return list
+
+static func build_transitions() -> Array[StateTransition]:
+	var list: Array[StateTransition] = []
+
+	var t_is_on_floor = TransitionCondition.new(func(data):
+		return data.is_on_floor()
+		)
+	var t_n_is_on_floor = TransitionCondition.new(func(data):
+		return !data.is_on_floor()
+		)
+	
+	list.append(_edge(&"idle", &"fall", t_n_is_on_floor, 10))
+	list.append(_edge(&"fall", &"idle", t_is_on_floor, 10))
+
+	return list
+
+static func _named(state: State, id: StringName) -> State:
+	state.id = id
+	return state
+
+static func _edge(from: StringName, to: StringName, condition: TransitionCondition, priority: int) -> StateTransition:
+	var t:= StateTransition.new()
+	t.from = from
+	t.to = to
+	t.condition = condition
+	t.priority = priority
+	return t

player/setup_state.gd.uid

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+uid://d3vpouroevnpp

player/states/fall.gd

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+extends State
+
+func enter(char: Object) -> void:
+	char.play_animation("fall")
+
+func process(char: Object, delta: float) -> void:
+	char.velocity.y += 900.0 * delta
+	char.move_and_slide()

player/states/fall.gd.uid

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+uid://c1dkyfrnd4mcu

player/states/idle.gd

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+extends State
+
+func enter(char: Object) -> void:
+	char.play_animation("idle")
+	char.velocity.x = 0.0
+
+func process(char: Object, delta: float) -> void:
+	char.move_and_slide()

player/states/idle.gd.uid

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+uid://bq7nhigvlxpq5