Question

我试图了解如何在pygame中定义退出。我正在制作汽车游戏，你必须避免障碍物与汽车接触。

我的错误是

line 71, in <module>
    while not gameExit:
NameError: name 'gameExit' is not defined

我的代码是

import pygame
import time
import random

pygame.init()

display_width = 800
display_height = 600

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

car_width = 73

gameDisplay = pygame.display.set_mode((display_width, display_height))

pygame.display.set_caption("Hi There Fucker")

clock = pygame.time.Clock()

carImg = pygame.image.load("mycar.png")

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

def things(thingx, thingy, thingw, thingh, color):
    pygame.draw.rect(gameDisplay, color, [thingx, thingy, thingw, thingh])

def car(x,y):
    gameDisplay.blit(carImg, (x,y))


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


def message_display(text):
    largeText = pygame.font.Font("freesansbold.ttf", 115)
    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("You crashed")

def game_loop():
    x = (display_width * 0.1)
    y = (display_height * 0.3)

    x_change = 0

    thing_starx = random.randrange(0, display_width)
    thing_starty = -600
    thing_speed = 7
    thing_width = 100
    thing_height = 100

    gameExit = False

while not gameExit:
    for event in pygame.event.get():
        if event.type == pygame.QUIT:
            pygame.quit()
            quit()

Answer 1

   thing_height = 100
   # this doesn't define it at a global scope. 
   gameExit = False
## gameExit is not defined
while not gameExit:

问题是您尚未定义该值gameExit。考虑在全球范围内更早地定义它。

pygame.init()

gameExit=False
display_width = 800

Answer 2

这是一个范围问题。您的变量gameExit仅在使用它的函数内定义。

解决此问题的最简单方法是在程序开始时将其声明为False，并将global gameExit置于设置它的所有函数的顶部，从而确保它们可以访问它的全球版本并没有重新定义它。

为了您的目的，我确定这很好，但您可能想查看top answer on this question。

gameExit未定义错误

2 个答案: