python - Pygame 暂停时显示文本

Question

我正在编写一个简单的游戏，当我按“空格键”时，可以洗牌并显示 52 张扑克中的 5 张牌。一切正常，除了我想在屏幕上呈现一个文本，指示卡片是否正在洗牌或它是结果......以下是代码:

import pygame,sys
from pygame.locals import *

my_clock = pygame.time.Clock()
pygame.init()
color =(200,0,0)
surface_sz = 480
surface = pygame.display.set_mode((surface_sz, surface_sz))
card=pygame.image.load("sprite_sheet_playing_cards.png")
card_width = 73

all_cards=[]
paused=False
text=["Shuffling Cards","Result"]
text_posn=0
my_font = pygame.font.SysFont("Courier", 20)

while True:

    for event in pygame.event.get():

        if event.type == QUIT:
            pygame.quit()
            sys.exit()
        elif event.type == KEYDOWN:
            if event.key == K_SPACE:

                #Shift the text_posn
                text_posn+=1
                text_posn= text_posn%2

                paused = not paused

    surface.fill(color)

    #create 5 crad objects and store them in list
    for card_no in range(5):

        hand_card=cards(card,(50+card_no*card_width,240))
        all_cards.append(hand_card)

    # Start the shuffling
    hand_card.start_shuffle(all_cards,surface)

    #draw the text to surface
    the_text = my_font.render(text[text_posn],True, (0,0,0))
    surface.blit(the_text, (120, 90))

    if paused:
        continue # skip this iteration if paused

    #put everything on display
    pygame.display.flip()

    my_clock.tick(10)

这是我的卡片类:

class cards(pygame.sprite.Sprite):
    def __init__(self,img,tar_posn):

        pygame.sprite.Sprite.__init__(self)
        self.image = img
        self.posn = tar_posn
        self.x = 0
        self.y= 0

    def start_shuffle(self,all_cards,target_surface):
        #shuffle the card and draw it on screen
        for one_card in all_cards:
            one_card.shuffle()
            one_card.draw(target_surface)

    def shuffle(self):
        import random
        self.x = random.randint(0,12)
        self.y = random.randint(0,4)


    def draw(self,target_surface):

        patch_rect = (self.x * 73, self.y*98,
                   73, 98)
        target_surface.blit(self.image, self.posn, patch_rect)

The word " Shuffling Cards" stuck even I pressed space and changed text_posn.(text_posn did shift between 0 and 1 when pressed space bar)

我知道问题是当我暂停时，我跳过了 pygame.display.flip() ，所以我永远无法更新屏幕上更改的文本。有什么想法可以暂停屏幕并同时更新文本消息吗？谢谢。

sprite_sheet_playing_cards.png:

Answer 1

您可以尝试在调用pygame.display.flip()之后添加if Paused: continue。

还要在 pygame.display.flip() 之前对屏幕或文本进行任何更改，以便它会在暂停之前更新您对屏幕所做的更改。

<小时/>

好的，我想我已经解决了您的问题。我更改了一些内容，并将在下面发布更新的代码:

import pygame,sys
from pygame.locals import *

my_clock = pygame.time.Clock()
pygame.init()
color =(200,0,0)
surface_sz = 480
surface = pygame.display.set_mode((surface_sz, surface_sz))
pygame.display.set_caption("Cards")
card=pygame.image.load("sprite_sheet_playing_cards.png")
card_width = 73

all_cards=[]
paused=False
text=["Shuffling Cards","Result"]
text_posn=0
my_font = pygame.font.SysFont("Courier", 20)

while True:

    for event in pygame.event.get():

        if event.type == QUIT:
            pygame.quit()
            sys.exit()
        elif event.type == KEYDOWN:
            if event.key == K_SPACE:

                #Shift the text_posn
                text_posn+=1
                text_posn= text_posn%2

                paused = not paused

    surface.fill(color)

    if not paused:
        #create 5 card objects and store them in list
        for card_no in range(5):

            hand_card=cards(card,(50+card_no*card_width,240))
            all_cards.append(hand_card)

        # Start the shuffling
        hand_card.start_shuffle(all_cards,surface)

        #draw the text to surface
        the_text = my_font.render(text[text_posn],True, (0,0,0))
        surface.blit(the_text, (120, 90))

    for each_card in all_cards:
        surface.blit(each_card.image, each_card.posn, each_card.patch_rect)

    #put everything on display
    pygame.display.flip()
    my_clock.tick(10)

以及更新的卡片类:

class cards(pygame.sprite.Sprite):
    def __init__(self,img,tar_posn):

        pygame.sprite.Sprite.__init__(self)
        self.image = img
        self.posn = tar_posn
        self.x = 0
        self.y= 0

    def start_shuffle(self,all_cards,target_surface):
        #shuffle the card and draw it on screen
        for one_card in all_cards:
            one_card.shuffle()
            one_card.update(target_surface)

    def shuffle(self):
        import random
        self.x = random.randint(0,12)
        self.y = random.randint(0,4)

    def update(self,target_surface):
        self.patch_rect = (self.x * 73, self.y*98,73, 98)

这里的主要“修复”是将大部分洗牌代码放入 if 语句中，检查游戏是否已暂停，如果暂停，则不会重新洗牌，而只会绘制它们并更新屏幕。显示文本的代码也在该 if 语句内，导致它仅在程序未暂停时显示。

另外:

我将你的draw()函数更改为update()函数，它仍然可以计算出patch_rect，我还将它更改为self.patch_rect，以便你可以从新的for循环中访问它主循环。 for 循环仅绘制 all_cards 中的每张卡片。

请告诉我这是否不是您想要的效果。