feat(word.gd): 对 Word 进行重要修改

* 删除 Word 的 is_victory 属性
* 添加 Word 的 color 属性，使其可以任意更改颜色
* 将 Word 的 text_id 由“从 1 开始”改为“从 0 开始”

objects/word/word.gd

@@ -2,7 +2,7 @@ extends AnimatedSprite2D
 
 
 @export var text_id := 1
-@export var is_victory = false
+@export var color := Color.BLACK
 
 
 const STEP := 30
@@ -18,60 +18,80 @@ const LETTER_NAME = ["_", "=", "P", "b", "D",
 func get_letter_id(letter: String) -> int:
 	for i in range(len(LETTER_NAME)):
 		if LETTER_NAME[i] == letter:
-			return i + 1
+			return i
 	assert(false, "Letter " + letter + " not found")
 	return -1
 
 
 ## 内建，不要用。
 func set_text_id(value: int) -> void:
+	assert(value >= 0, "text id < 0")
 	text_id = value
-
-	assert(value > 0, "text id <= 0")
-	
-	var animation_id = str(text_id) + str(is_victory)
+	update_animation()
+
+func update_animation() -> void:
+	var animation_id = str(text_id) + color.to_html()
 	if not sprite_frames.has_animation(animation_id):
 		sprite_frames.add_animation(animation_id)
 		for i in range(3):
-			sprite_frames.add_frame(animation_id, load_image(i * STEP + text_id, is_victory))
+			sprite_frames.add_frame(animation_id, load_image(i * STEP + text_id + 1, color))
 	animation = animation_id
 
 
 
 ## 更改字母为 text。
 func set_word(text: String) -> void:
 	if text == "_" or text == ".":
-		set_text_id(1)
+		set_text_id(0)
 	else:
 		set_text_id(get_letter_id(text))
 
 ## 获得当前字母。
 func get_word() -> String:
-	return LETTER_NAME[text_id - 1]
+	return LETTER_NAME[text_id]
 
 
 func _ready():
-	set_text_id(text_id)
+	update_animation()
+
 
 
 func _process(delta):
-	if animation == "default":
-		set_text_id(text_id)
+	update_animation()
 
-func set_victory(v: bool):
-	if v != is_victory:
-		is_victory = v
-		set_text_id(text_id)
+func set_color_from_name(name: String) -> void:
+	if name == "red":
+		set_color(Color("#DD4132"))
+	elif name == "golden":
+		set_color(Color("#F5DF4D"))
+	elif name == "default":
+		set_color(Color.BLACK)
+	else:
+		assert(false, "color %s not in list" % name)
+
+func set_color(value: Color) -> void:
+	color = value
+	update_animation()
+
+## 设置是否为关卡通过状态。
+## 已弃用，请使用 set_color 或 set_color_from_name 代替。
+## @deprecated
+func set_victory(v: bool) -> void:
+	push_warning("void set_victory(v: bool) is deprecated.")
+	if v:
+		set_color_from_name("golden")
+	else:
+		set_color_from_name("default")
 
-func load_image(h: int, is_victory: bool):
+func load_image(h: int, new_color: Color):
 	var image := load("res://objects/word/sprites/sprite" + str(h) + ".png")
-	if is_victory:
+	if new_color != Color.BLACK:
 		var new_texture = image.get_image()
 		for x in range(new_texture.get_width()):
 			for y in range(new_texture.get_height()):
 				var color = new_texture.get_pixel(x, y)
-				if color == Color(0, 0, 0, 1):  # 如果像素是黑色
-					new_texture.set_pixel(x, y, Color.hex(0xf5df4dff))  # 将其改为金黄色
+				if color == Color.BLACK:  # 如果像素是黑色
+					new_texture.set_pixel(x, y, new_color)  # 将其改为金黄色
 		return ImageTexture.create_from_image(new_texture)
 
 	return image