解决Pygame中打字机效果仅显示最后一段文本的问题

问题核心 #

你的代码存在两个关键问题导致仅显示最后一段文本：

1. 两次给text变量赋值，第二次直接覆盖了第一段文本的内容，最终只有第二段文本被传入cursor.write()。
2. 即使调用两次cursor.write()，原write方法会直接替换self.text列表，而非追加文本，导致第一段内容被覆盖丢失。

解决步骤 #

1. 修复文本覆盖问题 #

避免直接覆盖text变量，可选择合并两段文本，或用队列存储多段待输出内容：

• 合并文本方式：

text = """[i] Initializing ...
[i] Entering ghost mode ...

done ...

[Me] What you talking about?

done ...

"""

• 队列存储方式（适合分阶段输出）：

text_queue = [
    """[i] Initializing ...
[i] Entering ghost mode ...

done ...

""",
    """[Me] What you talking about?

done ...

"""
]

2. 修改Cursor类的文本处理逻辑 #

将原write方法改为追加文本，或新增队列管理功能实现多段文本顺序输出：

方案一：简单追加文本

修改Cursor类的write方法：

def write(self, text):
    # 用extend追加字符列表，而非替换原有内容
    self.text.extend(list(text))

之后在主代码中依次调用：

cursor.write("""[i] Initializing ...
[i] Entering ghost mode ...

done ...

""")
cursor.write("""[Me] What you talking about?

done ...

""")

方案二：多段文本顺序输出（推荐）

给Cursor类添加文本队列，实现第一段完全输出后自动加载第二段：

class Cursor(pygame.sprite.Sprite):
    def __init__(self, board):
        pygame.sprite.Sprite.__init__(self)
        self.image = pygame.Surface((10, 20))
        self.image.fill((255,255,255))
        self.text_height = 34
        self.text_width = 20
        self.rect = self.image.get_rect(topleft=(self.text_width, self.text_height))
        self.board = board
        self.text = []  # 当前正在输出的字符列表
        self.text_queue = []  # 待输出的文本段队列
        self.cooldown = 0
        self.cooldowns = {'.': 12,
                        '[': 18,
                        ']': 18,
                        ' ': 5,
                        '\n': 30}

    def add_text(self, text):
        # 将文本段加入队列
        self.text_queue.append(text)
    
    def update(self):
        # 当前无输出内容且队列非空时，取出下一段文本
        if not self.text and self.text_queue:
            self.text = list(self.text_queue.pop(0))
        
        if not self.cooldown and self.text:
            letter = self.text.pop(0)
            if letter == '\n':
                self.rect.move_ip((0, self.text_height))
                self.rect.x = self.text_width
            else:
                self.board.add(letter, self.rect.topleft)
                self.rect.move_ip((self.text_width, 0))
            self.cooldown = self.cooldowns.get(letter, 8)

        if self.cooldown:
            self.cooldown -= 1

主代码中调用新增的add_text方法添加文本：

cursor.add_text("""[i] Initializing ...
[i] Entering ghost mode ...

done ...

""")
cursor.add_text("""[Me] What you talking about?

done ...

""")

完整修改后代码示例 #

import pygame
import os
import time

#Sets the width and height of the screen
WIDTH = 320
HEIGHT = 240

#Importing the external screen
os.putenv('SDL_FBDEV', '/dev/fb1')
os.putenv('SDL_MOUSEDRV', 'TSLIB')
os.putenv('SDL_MOUSEDEV', '/dev/input/touchscreen')

#Initializes the screen - Careful: all pygame commands must come after the init
pygame.init()
clock = pygame.time.Clock()

#Sets mouse cursor visibility
pygame.mouse.set_visible(False)
#Sets the screen note: must be after pygame.init()
screen = pygame.display.set_mode((0,0), pygame.FULLSCREEN)

class Board(pygame.sprite.Sprite):
    def __init__(self):
        pygame.sprite.Sprite.__init__(self)
        self.image = pygame.Surface((900,900))
        self.image.fill((13,13,13))
        self.image.set_colorkey((13,13,13))
        self.rect = self.image.get_rect()
        self.font = pygame.font.Font('PressStart2P-Regular.ttf', 18)

    def add(self, letter, pos):
        s = self.font.render(letter, 1, (230, 230, 0))
        self.image.blit(s, pos)

class Cursor(pygame.sprite.Sprite):
    def __init__(self, board):
        pygame.sprite.Sprite.__init__(self)
        self.image = pygame.Surface((10, 20))
        self.image.fill((255,255,255))
        self.text_height = 34
        self.text_width = 20
        self.rect = self.image.get_rect(topleft=(self.text_width, self.text_height))
        self.board = board
        self.text = []
        self.text_queue = []
        self.cooldown = 0
        self.cooldowns = {'.': 12,
                        '[': 18,
                        ']': 18,
                        ' ': 5,
                        '\n': 30}

    def add_text(self, text):
        self.text_queue.append(text)

    def update(self):
        if not self.text and self.text_queue:
            self.text = list(self.text_queue.pop(0))
        
        if not self.cooldown and self.text:
            letter = self.text.pop(0)
            if letter == '\n':
                self.rect.move_ip((0, self.text_height))
                self.rect.x = self.text_width
            else:
                self.board.add(letter, self.rect.topleft)
                self.rect.move_ip((self.text_width, 0))
            self.cooldown = self.cooldowns.get(letter, 8)

        if self.cooldown:
            self.cooldown -= 1

all_sprites = pygame.sprite.Group()
board = Board()
cursor = Cursor(board)
all_sprites.add(cursor, board)

# 添加两段文本到输出队列
cursor.add_text("""[i] Initializing ...
[i] Entering ghost mode ...

done ...

""")
cursor.add_text("""[Me] What you talking about?

done ...

""")

#Main loop
running = True
while running:

    for e in pygame.event.get():
        if e.type == pygame.QUIT:
            running = False

    all_sprites.update()
    screen.fill((0, 0, 0))
    all_sprites.draw(screen)
    pygame.display.flip()
    clock.tick(60)

内容的提问来源于stack exchange，提问作者IWon Nerd