Python＆Pygame：无法离开暂停状态

Question

我是Python和Pygame的新手，我编写了一个小游戏并试图实现一个暂停菜单。虽然我可以进入暂停菜单，但我无法摆脱它。 我遵循sentdex的教程，并根据我的喜好更改了一些代码。我正在使用Python-Idle，但是我没有收到任何错误信息，所以我不知道我在做什么错误。

import pygame 
import time 
import random 
import shelve 

pygame.init() 

display_width = 800 
display_height = 600 

black = (0,0,0) 
white = (255,255,255) 

starfighter_width = 160 

highscore = 0 

paused = False 

gameDisplay = pygame.display.set_mode((display_width,display_height)) 
pygame.display.set_caption('A bit Racey') 
clock = pygame.time.Clock() 

backgroundImg = pygame.image.load('background.jpg') 

asteroidImg = pygame.image.load('asteroid.png') 
asteroidImg = pygame.transform.scale(asteroidImg, (100,100)) 

starfighterImg = pygame.image.load('x_wing.png') 
starfighterImg = pygame.transform.scale(starfighterImg, (160, 100)) 

def save_score(score): 
    d = shelve.open('score.txt') 
    if score > d['score']: 
     d['score'] = score 

    d.close() 

def get_highscore(): 
    d = shelve.open('score.txt') 
    global highscore 
    highscore = d['score'] 
    d.close() 

def display_highscore(): 
    global highscore 
    font = pygame.font.SysFont(None, 25) 
    text = font.render("Highscore: " + str(highscore), True, white) 
    gameDisplay.blit(text,(660, 0)) 

def things_dodged(count): 
    font = pygame.font.SysFont(None, 25) 
    text = font.render("Dodged: " + str(count), True, white) 
    gameDisplay.blit(text,(0,0)) 

def things(thingx, thingy): 
    gameDisplay.blit(asteroidImg, (thingx, thingy)) 

def starfighter(x,y): 
    gameDisplay.blit(starfighterImg,(x,y)) 

def text_objects(text, font): 
    textSurface = font.render(text, True, white) 
    return textSurface, textSurface.get_rect() 

def message_display(text): 
    largeText = pygame.font.Font('freesansbold.ttf',85) 
    TextSurf, TextRect = text_objects(text, largeText) 
    TextRect.center = ((display_width/2),(display_height/2)) 
    gameDisplay.blit(TextSurf, TextRect) 

    pygame.display.update() 

    time.sleep(2) 

    game_loop() 

def crash(): 
    message_display('Crashed you have') 

def pause(): 

    global paused 

    while paused: 
     for event in pygame.event.get(): 
      if event.type == pygame.QUIT: 
       pygame.quit() 
       quit() 
      if event.type == pygame.KEYDOWN: 
       if event.type == pygame.K_ESCAPE: 
        paused = False 

     largeText = pygame.font.Font('freesansbold.ttf',85) 
     TextSurf, TextRect = text_objects("Paused", largeText) 
     TextRect.center = ((display_width/2),(display_height/2)) 

     gameDisplay.blit(TextSurf, TextRect) 
     pygame.display.update() 

def game_intro(): 

    intro = True 

    while intro: 
     for event in pygame.event.get(): 
      if event.type == pygame.QUIT: 
       pygame.quit() 
       quit() 
      if event.type == pygame.KEYDOWN: 
       intro = False 

     gameDisplay.blit(backgroundImg, (0,0)) 
     largeText = pygame.font.Font('freesansbold.ttf',85) 
     TextSurf, TextRect = text_objects("Starfighter", largeText) 
     TextRect.center = ((display_width/2),(display_height/2)) 
     gameDisplay.blit(TextSurf, TextRect) 

     smallText = pygame.font.Font('freesansbold.ttf',35) 
     TextSurf, TextRect = text_objects("Press any key", smallText) 
     TextRect.center = ((display_width/2),(display_height/2 + 50)) 

     gameDisplay.blit(TextSurf, TextRect) 
     pygame.display.update() 



def game_loop(): 
    x = (display_width * 0.45) 
    y = (display_height * 0.8) 

    x_change = 0 

    thing_startx = random.randrange(0, display_width) 
    thing_starty = -600 
    thing_speed = 4 
    thing_width = 100 
    thing_height = 100 

    dodged = 0 

    gameExit = False 

    get_highscore() 

    global paused 

    while not gameExit: 

     for event in pygame.event.get(): 
      if event.type == pygame.QUIT: 
       pygame.quit() 
       quit() 

      if event.type == pygame.KEYDOWN: 
       if event.key == pygame.K_LEFT: 
        x_change = -5 
       elif event.key == pygame.K_RIGHT: 
        x_change = 5 
       elif event.key == pygame.K_ESCAPE: 
        paused = True 
        pause() 


      if event.type == pygame.KEYUP: 
       if event.key == pygame.K_LEFT or event.key == pygame.K_RIGHT: 
        x_change = 0 

     x += x_change 
     gameDisplay.blit(backgroundImg, (0,0)) 

     things(thing_startx, thing_starty) 
     thing_starty += thing_speed 
     starfighter(x,y) 
     things_dodged(dodged) 
     display_highscore() 

     if x > display_width - starfighter_width or x < 0: 
      save_score(dodged) 
      crash() 

     if thing_starty > display_height: 
      thing_starty = 0 - thing_height 
      thing_startx = random.randrange(0, display_width) 
      dodged += 1 
      thing_speed += 0.3 

     if y < thing_starty + thing_height: 

      if x + starfighter_width > thing_startx and x < thing_startx + thing_width: 
       save_score(dodged) 
       crash() 

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

game_intro() 
game_loop() 
pygame.quit() 
quit() 

Answer 1

您需要key我更换type：if event.type == pygame.K_ESCAPE:。

您也不需要全局变量paused，只需保留在pause函数中，直到用户按下转义键，然后从函数中按return即可。

import sys 
import pygame 


pygame.init() 

display = pygame.display.set_mode((800, 600)) 
clock = pygame.time.Clock() 


def pause(): 
    while True: 
     for event in pygame.event.get(): 
      if event.type == pygame.QUIT: 
       pygame.quit() 
       sys.exit() 
      elif event.type == pygame.KEYDOWN: 
       if event.key == pygame.K_ESCAPE: 
        return 

     pygame.draw.rect(display, (250, 0, 0), display.get_rect(), 3) 
     pygame.display.update() 
     clock.tick(60) 


def game_loop(): 
    x = 0 
    gameExit = False 

    while not gameExit: 
     for event in pygame.event.get(): 
      if event.type == pygame.QUIT: 
       gameExit = True 
      elif event.type == pygame.KEYDOWN: 
       if event.key == pygame.K_ESCAPE: 
        pause() 

     x += 1 
     display.fill((30, 30, 30)) 
     pygame.draw.rect(display, (0, 200, 250), (x, 200, 20, 20)) 

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


game_loop() 
pygame.quit()