python - 在 Pygame 中滚动无限背景

Question

这个问题已经有答案了:

Making the background move sideways in pygame (2 个回答)

How to scroll the background surface in PyGame? (1 个回答)

Why is my pygame application loop not working properly? (1 个回答)

已关闭 2 年前。

您好，我正在尝试在菜单屏幕中渲染 menu_background，并显示菜单选项。当我运行代码时，我得到的只是图像滚动，但我的菜单选项和音频不会播放和显示。任何人都可以帮助编写代码，使其在音频播放和我的菜单选项显示的地方工作吗？

import pygame, sys, random, time, os, math
from pygame.locals import *

fps = pygame.time.Clock()

global screen
screen = pygame.display.set_mode((WIDTH, HEIGHT),pygame.FULLSCREEN)
display = pygame.Surface((400,250))

def menu_background():
    menu_bg = pygame.image.load("assets/images/menu_bg.png").convert()
    x = 0

    while True:

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

        rel_x = x % menu_bg.get_rect().width
        screen.blit(menu_bg, (rel_x - menu_bg.get_rect().width, 0))
        if rel_x < WIDTH:
                screen.blit(menu_bg, (rel_x, 0))
        x -= 1
        pygame.display.update()
        fps.tick(120)

def menu():
    bg = menu_background()
    menu_options = ['Play','Controls','Highscores','Settings','Credits','Quit']
    menu_choice = 0
    in_menu = True

    pygame.mixer.music.load('assets/audio/mainmenu.wav')

    while in_menu:
        bg(display)

        n = 0
        for option in menu_options:

        for event in pygame.event.get():
            if event.type == QUIT:
                pygame.quit()
                sys.exit()
            if event.type == KEYDOWN:
                if event.key == K_ESCAPE:
                    pygame.quit()
                    sys.exit()
                if event.key == K_UP:
                    menu_choice -= 1
                    if menu_choice < 0:
                        menu_choice = len(menu_options)-1
                if event.key == K_DOWN:
                    menu_choice += 1
                    if menu_choice >= len(menu_options):
                        menu_choice = 0
                if event.key == K_SPACE:
                    choice = menu_options[menu_choice]
                    if choice == 'Play':
                        play()
                    if choice == 'Controls':
                        controls()

        screen.blit(pygame.transform.scale(display,(WIDTH,HEIGHT)),(0,0))
        pygame.display.update()
        fps.tick(60) 

Answer 1

主要问题是您已经实现了 2 个主要应用程序循环。循环被一个接一个地执行。(顺便说一下，第一个循环永远不会终止)

将所有实现放在一个循环中。应用程序循环必须

• 处理事件并更改状态

• 绘制背景

• 绘制场景和菜单

• 更新显示

例如:

def menu():

    x = 0
    menu_bg = pygame.image.load("assets/images/menu_bg.png").convert()

    menu_options = ['Play','Controls','Highscores','Settings','Credits','Quit']
    menu_choice = 0
    in_menu = True

    # load and play music
    pygame.mixer.music.load('assets/audio/mainmenu.wav')
    pygame.mixer.music.play()

    while in_menu:
        fps.tick(120)

        # handle events
        for event in pygame.event.get():
            if event.type == QUIT:
                pygame.quit()
                sys.exit()
            if event.type == KEYDOWN:
                if event.key == K_ESCAPE:
                    pygame.quit()
                    sys.exit()
                if event.key == K_UP:
                    menu_choice -= 1
                    if menu_choice < 0:
                        menu_choice = len(menu_options)-1
                if event.key == K_DOWN:
                    menu_choice += 1
                    if menu_choice >= len(menu_options):
                        menu_choice = 0
                if event.key == K_SPACE:
                    choice = menu_options[menu_choice]
                    if choice == 'Play':
                        play()
                    if choice == 'Controls':
                        controls()

        # draw background
        rel_x = x % menu_bg.get_rect().width
        screen.blit(menu_bg, (rel_x - menu_bg.get_rect().width, 0))
        if rel_x < WIDTH:
                screen.blit(menu_bg, (rel_x, 0))
        x -= 1

        # draw menu
        #n = 0
        #for option in menu_options:
        #    [...]

        # update disaplay
        pygame.display.update()

menu()