Pygame计分文本不显示求助：乒乓球游戏无报错但无文字

核心问题及修复步骤 #

• 绘制顺序错误：你在填充背景色之前调用了draw_playscore()，背景色会直接覆盖已绘制的文字。需将文字绘制操作移到所有图形绘制完成之后、pygame.display.update()之前。
• 文字渲染颜色参数错误：pygame.font.Font.render()的第三个参数要求是RGB颜色元组，你传入了三个单独的255，导致文字颜色异常（实际为灰色而非白色）。正确写法是(255, 255, 255)。
• 事件处理缩进错误：键盘按键的KEYDOWN/KEYUP判断不在事件循环内部，会导致按键控制失效，需将这部分代码缩进至for event in pygame.event.get():循环内。
• 额外优化：ball_restart()函数仅重置了ball_speed_y的方向，得分后球会一直向同一方向移动，建议同时随机化ball_speed_x的方向。

修正后的完整代码 #

import pygame, random

pygame.font.init()

opponent_score = 0
player_score = 0

smallfont = pygame.font.Font(None, 50)

def draw_playscore():
    # 修正颜色参数为RGB元组，同时添加对手分数显示
    player_text = smallfont.render(f"Player: {player_score}", True, (255, 255, 255))
    opponent_text = smallfont.render(f"Opponent: {opponent_score}", True, (255, 255, 255))
    # 分位置绘制分数，避免重叠
    screen.blit(player_text, (SCREEN_WIDTH - 200, 20))
    screen.blit(opponent_text, (20, 20))

def ball_animation():
    global opponent_score
    global player_score
    global ball_speed_x, ball_speed_y

    ball.x += ball_speed_x
    ball.y += ball_speed_y

    if ball.top <= 0 or ball.bottom >= SCREEN_HEIGHT:
        ball_speed_y *= -1
    if ball.left <=0:
        ball_restart()
        player_score +=1
    elif ball.right >= SCREEN_WIDTH:
        ball_restart()
        opponent_score +=1

    if ball.colliderect(player) or ball.colliderect(opponent):
        ball_speed_x *= -1

def player_animation():
    player.y += player_speed
    if player.top <= 0:
        player.top = 0
    if player.bottom >= SCREEN_HEIGHT:
        player.bottom = SCREEN_HEIGHT

def opponent_animation():
    if opponent.top < ball.y:
        opponent.top += opponent_speed
    if opponent.bottom > ball.y:
        opponent.bottom -= opponent_speed
    if opponent.top <= 0:
        opponent.top = 0
    if opponent.bottom >= SCREEN_HEIGHT:
        opponent.bottom = SCREEN_HEIGHT

def ball_restart():
    global ball_speed_x, ball_speed_y
    ball.center = (SCREEN_WIDTH/2, SCREEN_HEIGHT/2)
    # 同时随机化x和y方向的速度
    ball_speed_y *= random.choice((1,-1))
    ball_speed_x *= random.choice((1,-1))

pygame.init()
clock = pygame.time.Clock()

SCREEN_WIDTH = 800
SCREEN_HEIGHT = 600

screen = pygame.display.set_mode((SCREEN_WIDTH, SCREEN_HEIGHT))

ball = pygame.Rect(SCREEN_WIDTH/2 - 15, SCREEN_HEIGHT/2 -15, 30, 30)
player = pygame.Rect(SCREEN_WIDTH -20, SCREEN_HEIGHT/2 -70, 10, 140)
opponent = pygame.Rect(10, SCREEN_HEIGHT/2 -70, 10, 140)

bg_color = pygame.Color('grey12')
light_grey = (200,200,200)

ball_speed_x = 5
ball_speed_y = 5
player_speed = 0
opponent_speed = 7

run = True
while run:
    for event in pygame.event.get():
        if event.type == pygame.QUIT:
            run = False
        # 修正缩进：将按键处理移到事件循环内
        if event.type == pygame.KEYDOWN:
            if event.key == pygame.K_DOWN:
                player_speed +=2
            if event.key == pygame.K_UP:
                player_speed -=2
        if event.type == pygame.KEYUP:
            if event.key == pygame.K_DOWN:
                player_speed =0
            if event.key == pygame.K_UP:
                player_speed =0

    ball_animation()
    player_animation()
    opponent_animation()

    # 先绘制背景和游戏元素，再绘制文字避免被覆盖
    screen.fill(bg_color)
    pygame.draw.rect(screen, light_grey, player)
    pygame.draw.rect(screen, light_grey, opponent)
    pygame.draw.ellipse(screen, light_grey, ball)
    pygame.draw.aaline(screen, light_grey, (SCREEN_WIDTH/2,0), (SCREEN_WIDTH/2, SCREEN_HEIGHT))
    
    # 绘制分数
    draw_playscore()

    pygame.display.update()
    clock.tick(60)

if opponent_score > player_score:
    print(f"The opponent won with {opponent_score - player_score} more points than you!")
elif player_score > opponent_score:
    print(f"You Won With a {player_score - opponent_score} point difference! Congrats!")
else:
    print("It's a tie!")
print(f"You got {player_score} points!")
print(f"The Opponent got {opponent_score} points!")
pygame.quit()

内容的提问来源于stack exchange，提问作者BokoTriesToCode