python-3.x - 卡在 pygame.event.get()

Question

这几天开始学习pygame了，在使用pygame.event.get()的时候遇到了一些问题。希望有人能帮我弄清楚它背后的概念。

下面是我的简单代码：

import pygame

# initialize pygame
pygame.init()

# create a window
screen = pygame.display.set_mode((800,600))

# load player (image) into pygame
player_img = pygame.image.load("aircraft.png")
player_pos_x = 400
player_pos_y = 500
player_pos_x_change = 0

# remove and redraw image in screen: move the object
def PlayerPosition(x,y):
    screen.blit(player_img, (x,y))

# go inside game loop
running = True
while running:

    # receive any event
    for event in pygame.event.get():

        # handle QUIT event
        if event.type == pygame.QUIT:
            running = False

        # handle KEYDOWN event
        if event.type == pygame.KEYDOWN:

            # decide left key or right key is pressed
            if event.key == pygame.K_LEFT:
                if player_pos_x > 0:
                    player_pos_x_change = -0.1
                else:
                    player_pos_x_change = 0

            if event.key == pygame.K_RIGHT:
                player_pos_x_change = 0.1

        # handle KEYUP event
        if event.type == pygame.KEYUP:
            player_pos_x_change = 0


    # set background color :
    screen.fill((0, 0, 0))

    # update player's x position
    player_pos_x += player_pos_x_change

    # call function to remove and redraw image in screen
    PlayerPosition(player_pos_x, player_pos_y)

    pygame.display.update()

在 while 循环中，程序将使用 pygame.event.get() 接收事件。如果检测到“左键”被按下，则将x_change设置为负数，因此屏幕中的对象将向左移动，反之亦然。

现在，我想为我的屏幕做边界，对象不能超出屏幕。因此，我在if event.key == pygame.K_LEFT:中添加了一个条件：

if player_pos_x > 0:
    player_pos_x_change = -0.1
else:
    player_pos_x_change = 0

但是，当我连续按住左键时，对象仍然会离开屏幕。我不明白为什么会发生？

我非常感谢您的回复和评论。

标签： python-3.xpygame

Answer 1

setPostViews(get_the_ID());交换和的顺序the_post();

如果您在the_post之前调用它，您的调用get_the_ID()将返回不可靠的结果，因为这将设置您在循环内查看的帖子，并让所有标准 WordPress 模板函数返回正确的信息。the_post

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                        ?>
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