pygame左右移动问题 [英] pygame moving left and right issue

问题描述

我已经开始在 pygame 上制作一些东西，但是在向左或向右移动时遇到了问题.如果我快速地从按右箭头键更改为按左箭头键并放开右箭头键，则块就会停止移动.这是我的代码

I have started making something on pygame but I have encountered an issue when moving left or right. if I quickly change from pressing the right arrow key to pressing the left one and also let go of the right one the block just stops moving. this is my code

bg = "sky.jpg"
ms = "ms.png"
import pygame, sys
from pygame.locals import *
x,y = 0,0
movex,movey=0,0
pygame.init()
screen=pygame.display.set_mode((664,385),0,32)
background=pygame.image.load(bg).convert()
mouse_c=pygame.image.load(ms).convert_alpha()
m = 0
pygame.event.pump() 
while 1:
    for event in pygame.event.get():
        if event.type == QUIT:
            pygame.quit()
            sys.exit()
        if event.type==KEYDOWN:
            if event.key==K_LEFT:
                movex =-0.5
                m = m + 1
            if event.key==K_RIGHT:
                movex=+0.5
                m = m + 1
        elif event.type == KEYUP:
            if event.key==K_LEFT and not event.key==K_RIGHT:
                    movex = 0
            if event.key==K_RIGHT and not event.key==K_LEFT:
                    movex =0

    x+=movex
    y=200
    screen.blit(background, (0,0))
    screen.blit(mouse_c,(x,y))
    pygame.display.update()

有什么方法可以改变这个，所以如果按下右箭头键并释放左箭头键，它会向右移动而不是停止?附注我仍在学习 pygame 并且对模块非常陌生.如果这似乎是一个愚蠢的问题，我很抱歉，但我找不到任何答案.

is there a way I can change this so if the right arrow key is pressed and the left arrow key is released that it will go right instead of stopping? P.S I am still learning pygame and am very new to the module. I'm sorry if this seems like a stupid question but i couldn't find any answers to it.

推荐答案

你的问题是当你用

if event.key==K_LEFT and not event.key==K_RIGHT:

你总是得到 True，因为当 event.key==K_LEFT 为 True 时，它也总是not event.key==K_RIGHT(因为事件的关键毕竟是K_LEFT).

you always get True, because when event.key==K_LEFT is True, it also always is not event.key==K_RIGHT (because the key of the event is K_LEFT after all).

我解决这类问题的方法是分离行动的意图.所以，对于关键事件，我只会跟踪什么动作应该发生，像这样:

My approach to this kind of problem is to separate the intent from the action. So, for the key events, I would simply keep track of what action is supposed to happen, like this:

moveLeft = False
moveRight = False

while True:
  for event in pygame.event.get():
    if event.type == QUIT:
      pygame.quit()
      sys.exit()
    if event.type == KEYDOWN:
      if event.key == K_LEFT:  moveLeft  = True
      if event.key == K_RIGHT: moveRight = True
    elif event.type == KEYUP:
      if event.key == K_LEFT:  moveLeft  = False
      if event.key == K_RIGHT: moveRight = False

然后，在循环的主要"部分，您可以根据输入采取行动，例如:

Then, in the "main" part of the loop, you can take action based on the input, such as:

while True:
  for event in pygame.event.get():
    ...
  if moveLeft  : x -= 0.5
  if moveRight : x += 0.5

这篇关于pygame左右移动问题的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！