无法弄清楚为什么我的图像不会在 pygame 中移动

Question

我只是在玩 Pygame，我看不出我做错了什么来使红色圆圈用箭头键移动。我不知道它是否在我的主循环中。我也找不到很多关于精灵或使用 Pygame 循环动画的教程。例如，如果我想制作一个像移动平台一样摆动的正方形，我该怎么做？

import pygame import time ## event handling varibles player_x = 0 player_y = 0 x = 250 y = 250 ## screen display display_width = 500 display_height = 500 pygame.init() game_screen = pygame.display.set_mode((display_width,display_height)) pygame.display.set_caption("test") # player def player(): pygame.draw.circle(game_screen,red,(x,y),15) # colors white = (255,255,255) red = (255,0,0) black = (0,0,0) ### main loop dead = False while dead != True: for event in pygame.event.get(): if event.type == pygame.QUIT: dead = True if event.type == pygame.KEYDOWN: if event.key == pygame.K_LEFT: player_x = -1 elif event.key == pygame.K_RIGHT: player_x = +1 if event.key == pygame.K_UP: player_y = +1 elif event.key == pygame.K_DOWN: player_y = -1 if event.type == pygame.KEYUP: if event.key == pygame.K_LEFT or pygame.K_RIGHT: player_x = 0 if event.key == pygame.K_UP or pygame.K_DOWN: player_y = 0 game_screen.fill(black) player() pygame.display.update() x -= player_x y -= player_y pygame.quit() quit()

Answer 1

1. 你的缩进都搞砸了。

你的代码不会做任何事情，除非事件是 QUIT... 然后让它退出。

1. 您的布尔逻辑错误。

这不是正确的语法event.key == pygame.K_UP or pygame.K_DOWN。这里的优先顺序如下(event.key == pygame.K_UP) or (K_DOWN)。由于 K_DOWN 是真的，它总是真的，因此这整个陈述总是真的。

我想你的意思是：event.key == pygame.K_UP or event.key == pygame.K_DOWN

1. 最后，它不会像你说的那样一直移动。

只有当队列中有事件时它才会移动。您可以通过生成事件使其继续移动。也许有一个事件计时器。

这是一个固定版本，希望对你有帮助：

import pygame
import time

## event handling varibles
player_x = 0
player_y = 0
x = 250
y = 250

## screen display
display_width = 500
display_height = 500
pygame.init()
game_screen = pygame.display.set_mode((display_width,display_height))
pygame.display.set_caption("test")

# player
def player(game_screen, red, point):   # Use parameters not globals
    pygame.draw.circle(game_screen, red, point, 15)

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

### main loop
pygame.time.set_timer(pygame.USEREVENT, 1)  # 1 per second

dead = False
while not dead:
    for event in pygame.event.get():
        if event.type == pygame.QUIT:
            dead = True
        elif event.type == pygame.USEREVENT:
            pygame.time.set_timer(pygame.USEREVENT, 1)  # Set another timer for another 1 second

        elif event.type == pygame.KEYDOWN:
            if event.key == pygame.K_LEFT:
                player_x = +10
            elif event.key == pygame.K_RIGHT:
                player_x = -10
            elif event.key == pygame.K_UP:
                player_y = +10
            elif event.key == pygame.K_DOWN:
                player_y = -10
        elif event.type == pygame.KEYUP:
            if event.key in [pygame.K_LEFT, pygame.K_RIGHT]:
                player_x = 0
            elif event.key in [pygame.K_UP, pygame.K_DOWN]:
                player_y = 0
        game_screen.fill(black)
        player(game_screen,red,(x,y))
        pygame.display.update()
        x -= player_x
        y -= player_y

pygame.quit()