style: 修正命名规范

- 给未添加 class_name 的 .gd 添加 class_name
- 使用 <class_name>Scn 作为存储场景的常量名
- 修正 chapter_menu 中使用重名变量（chapter_id）的错误

levels/chapter_menu/chapter_menu.gd

@@ -1,10 +1,10 @@
 extends Node2D
 
+class_name ChapterMenu
 
-
-const BaseLevel := preload("res://levels/base_level/base_level.tscn")
-const LevelButton := preload("res://levels/chapter_menu/level_menu/level_button/level_button.tscn")
-const LevelMenu := preload("res://levels/chapter_menu/level_menu/level_menu.tscn")
+const BaseLevelScn := preload("res://levels/base_level/base_level.tscn")
+const LevelButtonScn := preload("res://levels/chapter_menu/level_menu/level_button/level_button.tscn")
+const LevelMenuScn := preload("res://levels/chapter_menu/level_menu/level_menu.tscn")
 
 # Called when the node enters the scene tree for the first time.
 
@@ -13,28 +13,28 @@ const button_width : int = 50
 const button_heigth : int = 50
 
 func init() -> void:
-	var chap_num : int = len(BaseLevel.instantiate().DATA)
-	for chapter_id in range(0, chap_num):
-		# print(chapter_id)
-		var level_num : int = len(BaseLevel.instantiate().DATA[chapter_id])
-		var button = LevelButton.instantiate();
-		var x : int = button_width * (chapter_id % 9) + 60
-		var y : int = button_heigth * (chapter_id / 9) + 100
-		button.init(chapter_id, level_num, Vector2(x, y), 0)
+	var chap_num : int = len(BaseLevelScn.instantiate().DATA)
+	for lvl_id in range(0, chap_num):
+		# print(lvl_id)
+		var level_num : int = len(BaseLevelScn.instantiate().DATA[lvl_id])
+		var button = LevelButtonScn.instantiate();
+		var x : int = button_width * (lvl_id % 9) + 60
+		var y : int = button_heigth * (lvl_id / 9) + 100
+		button.init(lvl_id, level_num, Vector2(x, y), 0)
 		button.enter_chapter.connect(_is_choose_chapter)
 		add_child(button)
 
 
 func _ready():
 	# print("ready")
 	init()
-	#print(BaseLevel.instantiate().DATA[chapter_id])
+	#print(BaseLevelScn.instantiate().DATA[chapter_id])
 	# print(chapter_num)
 
 
-func _is_choose_chapter(chapter_id : int, level_num : int):
-	var level_menu = LevelMenu.instantiate()
-	level_menu.init(chapter_id, level_num)
+func _is_choose_chapter(chap_id : int, level_num : int):
+	var level_menu = LevelMenuScn.instantiate()
+	level_menu.init(chap_id, level_num)
 	# print("here ready to change scene to ", chapter_id)
 	get_tree().root.add_child(level_menu)
 	queue_free()

levels/chapter_menu/level_menu/level_menu.gd

@@ -1,14 +1,14 @@
 extends Node2D
 
-
+class_name LevelMenu
 
 const CHAP_NAMES = ["=P", "Add and Multiply", "()", "Equal?", "<>"]
 
 const I_NUMBER = ["I","II","III","VI","V"]
 
-const LevelButton := preload("res://levels/chapter_menu/level_menu/level_button/level_button.tscn")
-const BaseLevel := preload("res://levels/base_level/base_level.tscn")
-const Credits := preload("res://objects/credits/credits.tscn")
+const LevelButtonScn := preload("res://levels/chapter_menu/level_menu/level_button/level_button.tscn")
+const BaseLevelScn := preload("res://levels/base_level/base_level.tscn")
+const CreditsScn := preload("res://objects/credits/credits.tscn")
 
 # Called when the node enters the scene tree for the first time.
 
@@ -19,21 +19,21 @@ const button_heigth : int = 50
 func init(chap_id : int, lvl_num : int) -> void:
 	#print("init?")
 
-	if chap_id == len(BaseLevel.instantiate().DATA):
-		add_child(Credits.instantiate())
+	if chap_id == len(BaseLevelScn.instantiate().DATA):
+		add_child(CreditsScn.instantiate())
 		$Title.set_text("")
 		return
 
 
 	if lvl_num == -1:
-		lvl_num = len(BaseLevel.instantiate().DATA[chap_id])
+		lvl_num = len(BaseLevelScn.instantiate().DATA[chap_id])
 
 	$Title.set_text("Ch." + I_NUMBER[chap_id] + "  " + CHAP_NAMES[chap_id])
 
 	chapter_id = chap_id
 	for level_id in range(0, lvl_num):
 		#print(level_id)
-		var button = LevelButton.instantiate();
+		var button = LevelButtonScn.instantiate();
 		var x : int = button_width * (level_id % 7) + 60
 		var y : int = button_heigth * (level_id / 7) + 100
 		button.init(chapter_id, level_id, Vector2(x, y), 1)
@@ -50,7 +50,7 @@ func _ready():
 
 
 func _on_button_enter_level(chap_id: int, lvl_id: int) -> void:
-	var base_level := BaseLevel.instantiate()
+	var base_level := BaseLevelScn.instantiate()
 
 	# print(chap_id, lvl_id)
 
@@ -64,8 +64,8 @@ func _input(event: InputEvent):
 			_on_back_button_pressed()
 
 func _on_back_button_pressed():
-	var ChapterMenu = load("res://levels/chapter_menu/chapter_menu.tscn")
-	var chapter_menu = ChapterMenu.instantiate()
+	var ChapterMenuScn = load("res://levels/chapter_menu/chapter_menu.tscn")
+	var chapter_menu = ChapterMenuScn.instantiate()
 
 	chapter_menu.init()
 	get_tree().root.add_child(chapter_menu)

objects/card_base/card_base.gd

@@ -2,7 +2,7 @@ extends Area2D
 
 class_name CardBase
 
-const Card := preload("res://objects/card/card.tscn")
+const CardScn := preload("res://objects/card/card.tscn")
 const FADE_MOVE_AMOUNT := 70
 
 signal card_put
@@ -42,7 +42,7 @@ func draw_card():
 	set_card_count(card_count - 1) 
 	$SFXPickUp.play()
 	Input.set_default_cursor_shape(Input.CURSOR_DRAG)
-	new_card_node = Card.instantiate()
+	new_card_node = CardScn.instantiate()
 	new_card_node.set_word($Word.get_word())
 	new_card_node.set_position(position)
 	$Cards.add_child(new_card_node)

objects/main_menu/main_menu.gd

@@ -1,7 +1,9 @@
 extends Node2D
 
-const ChapterMenu = preload("res://levels/chapter_menu/chapter_menu.tscn")
-const BaseLevel := preload("res://levels/base_level/base_level.tscn")
+class_name MainMenu
+
+const ChapterMenuScn := preload("res://levels/chapter_menu/chapter_menu.tscn")
+const BaseLevelScn := preload("res://levels/base_level/base_level.tscn")
 
 signal enter_level()
 
@@ -10,15 +12,15 @@ func _ready():
 
 
 func _on_start_button_pressed():
-	var base_level := BaseLevel.instantiate()
+	var base_level := BaseLevelScn.instantiate()
 
 	# print(chap_id, lvl_id)
 
 	base_level.init(0, 0)
 	get_tree().root.add_child(base_level)
 	enter_level.emit()
 	queue_free()
-	#get_tree().root.add_child(ChapterMenu.instantiate())
+	#get_tree().root.add_child(ChapterMenuScn.instantiate())
 	#queue_free()