pygame显示空白屏幕

Question

所以我只是想学习如何用Python制作一个简单的游戏，但是当我尝试运行它时，pygame显示一个空白屏幕。

我还从正在学习的网站上粘贴了代码，但是当我运行它时，pygame仍然显示空白屏幕。

但是，我选择作为背景音乐的.wav文件确实播放了。

如果有必要，请使用Mac。

import pygame
import os
import time
import random

pygame.init()

crash_sound = pygame.mixer.Sound("/Users/matthewkok/Downloads/crash.wav")

pygame.mixer.music.load('/Users/matthewkok/Downloads/jazz.wav')
pygame.mixer.music.play(-1)

display_width = 800
display_height = 600

gameDisplay = pygame.display.set_mode((display_width, display_height))
pygame.display.set_caption('A Bit Racey')

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

red = (200,0,0)
green = (0,200,0)

bright_red = (255,0,0)
bright_green = (0,255,0)

block_color = (53,115,255)

car_width = 73

clock = pygame.time.Clock()
carImg = pygame.image.load('/Users/matthewkok/Pictures/racecar.png')
gameIcon = pygame.image.load('/Users/matthewkok/Pictures/racecar.png')

pygame.display.set_icon(gameIcon)

def game_intro():

    intro = True

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

        gameDisplay.fill(white)
        largeText = pygame.font.Font('freesansbold.ttf',115)
        TextSurf, TextRect = text_objects("A Bit Racey", largeText)
        TextRect.center = ((display_width/2),(display_height/2))
        gameDisplay.blit(TextSurf, TextRect)

        button("START!" ,150,450,100,50,green,bright_green,game_loop)
        button("EXIT?" ,550,450,100,50,red,bright_red,quitgame)

        pygame.display.update()
        clock.tick(15)

def paused():

    pygame.mixer.music.pause()

    largeText = pygame.font.SysFont("comicsansms",115)
    TextSurf, TextRect = text_objects("Paused", largeText)
    TextRect.center = ((display_width/2),(display_height/2))
    gameDisplay.blit(TextSurf, TextRect)


    while pause:
        for event in pygame.event.get():

            if event.type == pygame.QUIT:
                pygame.quit()
                quit()

        button("Continue",150,450,100,50,green,bright_green,unpause)
        button("Quit",550,450,100,50,red,bright_red,quitgame)

        pygame.display.update()
        clock.tick(15) 

def unpause():
    global pause
    pygame.mixer.music.unpause()

    pause = False


def button(msg,x,y,w,h,ic,ac,action=None):
    mouse = pygame.mouse.get_pos()
    click = pygame.mouse.get_presed()
    print(click)
    if x + w > mouse[0] > x and y + h > mouse[1] > y:
        pygame.draw.rect(gameDisplay, ac, (x, y, w, h))

        if click[0] == 1 and action != None:
            action()

    else:
        pygame.draw.rect(gameDisplay, ic, (x, y, w, h))

    smallText = pygame.font.Font("freesansbold.ttf", 20)
    textSurf, textRect = text_objects(msg, smallText)
    textRect.center = ((x+(w/2)) , (y+(h/2)))
    gameDisplay.blit(textSurf, textRect)

def crash():

    pygame.mixer.Sound.play(crash_sound)
    pygame.mixer.music.stop()

    largeText = pygame.font.SysFont("comicsansms",115)
    TextSurf, TextRect = text_objects("You Crashed", largeText)
    TextRect.center = ((display_width/2),(display_height/2))
    gameDisplay.blit(TextSurf, TextRect)


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

        button("Play Again",150,450,100,50,green,bright_green,game_loop)
        button("Quit",550,450,100,50,red,bright_red,quitgame)

        pygame.display.update()
        clock.tick(15)

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 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 = 7
    thing_width = 100
    thing_height = 100

    thingCount = 1

    dodged = 0

    gameExit = False

    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
                if event.key == pygame.K_RIGHT:
                    x_change = 5

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

        x += x_change

        gameDisplay.fill(white)

        things(thing_startx, thing_starty, thing_width, thing_height, black)
        thing_starty += thing_speed        

        car(x,y)

        if x > display_width - car_width or x < 0:
            crash()

        if thing_starty > display_height:
            thing_starty = 0 - thing_height
            thing_startx = random.randrange(0, display_width)
            dodged += 1
            thing_speed += 1
            thing_width += (dodged * 1.2)

        if y < thing_starty + thing_height:
            print('y crossover')

            if x > thing_startx and x < thing_startx + thing_width or x+car_width > thing_startx and x + car_width < thing_startx+thing_width:
                print('x crossover')
                crash()

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


game_loop()
pygame.quit()
quit()