时间戳

首页 > 解决方案 > 即使我不按侧键，我的宇宙飞船也会继续移动

python - 即使我不按侧键，我的宇宙飞船也会继续移动

问题描述

import pygame
#initialize the screen
pygame.init()

#create the screen
screen = pygame.display.set_mode((800, 700))

#tile and icon
pygame.display.set_caption("Space Invaders")
icon = pygame.image.load("spaceship.png")
pygame.display.set_icon(icon)

#Player
playerImg = pygame.image.load("player.png")
playerx = 370
playery = 600
playerx_change = 0.39

def player(x,y):
    screen.blit(playerImg, (x,y))

running = True
while running:

    screen.fill((0,0,0))
    for event in pygame.event.get():
        if event.type == pygame.QUIT:
            running = False

        #keystroke
        if event.type == pygame.KEYDOWN:
           if event.key == pygame.K_LEFT:
                playerx_change = -0.39
           if event.key== pygame.K_RIGHT:
                playerx_change = 0.39
           if event.type == pygame.KEYUP:
                if event.key == pygame.K_LEFT or event.type == pygame.K_RIGHT:
                    playerx_change = 0
            

    playerx += playerx_change
    player(playerx,playery)
    pygame.display.update()

即使我不按侧键，我的宇宙飞船也会继续移动。我正在使用 python 和 pygame 创建太空入侵者。根据代码，这艘船不会停止。我使用的是 Visual Studio 2019 的社区版。

标签： pythonpython-3.xpygame

解决方案

您的代码中有错字，event.key == pygame.K_RIGHT而不是event.type == pygame.K_RIGHT.
此外，还有一个缩进问题：

running = True
while running:
    # [...]  

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

        #keystroke
        if event.type == pygame.KEYDOWN:
            if event.key == pygame.K_LEFT:
                playerx_change = -0.39
            if event.key== pygame.K_RIGHT:
                playerx_change = 0.39
        
        #<--| INDENTATION
        if event.type == pygame.KEYUP:
           if event.key == pygame.K_LEFT or event.key == pygame.K_RIGHT:
                playerx_change = 0

无论如何，我建议使用pygame.key.get_pressed()而不是运动的关键事件：

running = True
while running:

    screen.fill((0,0,0))
    for event in pygame.event.get():
        if event.type == pygame.QUIT:
            running = False

    keys = pygame.key.get_pressed()
    if keys[pygame.K_LEFT]:        
        playerx -= 0.39
    if keys[pygame.K_RIGHT]:        
        playerx += 0.39

    player(playerx,playery)
    pygame.display.update()

按键事件KEYDOWN和KEYUP分别在按键被释放时发生一次，但返回的状态pygame.key.get_pressed()是True只要按键被按住。

推荐阅读