如何在 pygame 中以正确的方式使用 blit()？

Question

我正在尝试制作一个纹理游戏，但没有任何错误。我会显示代码。

import time
import pygame
from pygame.locals import *

def Main():
    pygame.mixer.init()

    pygame.mixer.music.load(r"C:\...\OMFG+-+Ice+Cream.mp3")
    pygame.mixer.music.play(-1)

    pygame.init()

    screen = pygame.display.set_mode((640, 480))
    screen.fill((0,0,0))
    pygame.display.set_caption("3 Minutes Left!!!")

    font = pygame.font.Font('freesansbold.ttf', 18)

    intro_1 = font.render('3', True, (255,255,255))
    intro_2 = font.render('Minutes', True, (255,255,255))
    intro_3 = font.render('Left!!!', True, (255,255,255))

    time.sleep(1)
    screen.blit(intro_1, (140, 30)) #This isn't working.
    time.sleep(1)
    screen.blit(intro_2, (340, 30)) #This isn't working.
    time.sleep(1)
    screen.blit(intro_3, (540, 30)) #This isn't working.

Main()

我认为代码 screen.blit 可以与 while 循环一起使用。所以我尝试了。

import time
import pygame
from pygame.locals import *

def Main():
    pygame.mixer.init()

    pygame.mixer.music.load(r"C:\...\OMFG+-+Ice+Cream.mp3")
    pygame.mixer.music.play(-1)

    pygame.init()

    screen = pygame.display.set_mode((640, 480))
    screen.fill((0,0,0))
    pygame.display.set_caption("3 Minutes Left!!!")

    font = pygame.font.Font('freesansbold.ttf', 18)

    intro_1 = font.render('3', True, (255,255,255))
    intro_2 = font.render('Minutes', True, (255,255,255))
    intro_3 = font.render('Left!!!', True, (255,255,255))

    while True: #This isn't working.
        time.sleep(1)
        screen.blit(intro_1, (140, 30)) #This isn't working.
        time.sleep(1)
        screen.blit(intro_2, (340, 30)) #This isn't working.
        time.sleep(1)
        screen.blit(intro_3, (540, 30)) #This isn't working.

Main()

然后我启动了程序。但是 pygame 选项卡没有响应。所以我在定义中尝试了screen.blit。

import time
import pygame
from pygame.locals import *

def Main():
    pygame.mixer.init()

    pygame.mixer.music.load(r"C:\...\OMFG+-+Ice+Cream.mp3")
    pygame.mixer.music.play(-1)

    pygame.init()

    screen = pygame.display.set_mode((640, 480))
    screen.fill((0,0,0))
    pygame.display.set_caption("3 Minutes Left!!!")

    font = pygame.font.Font('freesansbold.ttf', 18)

    intro_1 = font.render('3', True, (255,255,255))
    intro_2 = font.render('Minutes', True, (255,255,255))
    intro_3 = font.render('Left!!!', True, (255,255,255))

    while True: #This isn't working.
        screen_blit(screen, intro_1, intro_2, intro_3) #This isn't working.

def screen_blit(screen, intro_1, intro_2, intro_3): #This isn't working.
    time.sleep(1)
    screen.blit(intro_1, (340, 30)) #This isn't working.
    time.sleep(1)
    screen.blit(intro_2, (340, 30)) #This isn't working.
    time.sleep(1)
    screen.blit(intro_3, (340, 30)) #This isn't working.

Main()

同样，没有回应。我该如何解决这个问题？？？

Answer 1

window 没有响应，因为您不处理事件。您在 window 中看不到任何内容，因为您没有更新显示。
最小的典型 PyGame 应用程序

需要一个游戏循环
必须通过 pygame.event.pump() or pygame.event.get().
必须更新显示 Surface, by either pygame.display.flip() or pygame.display.update()。

例如：

def Main():
    # [...]

    while True: #This isn't working.

        # handle the events
        for event in pygame.event.get():
            if event.type == pygame.QUIT:
                self.quit()

        # draw the scene
        screen.blit(intro_1, (340, 30))

        # update the display
        pygame.display.flip()

Answer 2

每次 draw/blit 需要更新屏幕，否则更改不会显示。

无论您是在循环内还是在函数内更改内容都无关紧要，重要的是您通过调用 pygame.display.flip() 来更新屏幕，这会更新整个屏幕，或者 pygame.display.update()，它更新整个屏幕或传递给它的矩形。在此示例中，我使用 blitting 返回的矩形仅更新特定区域，并且还添加了一个处理事件的简单游戏循环，因此您的游戏将响应并可以退出：

import time
import pygame
from pygame.locals import *

def Main():
    pygame.mixer.init()

    pygame.mixer.music.load(r"C:\...\OMFG+-+Ice+Cream.mp3")
    pygame.mixer.music.play(-1)

    pygame.init()

    screen = pygame.display.set_mode((640, 480))
    screen.fill((0,0,0))
    pygame.display.set_caption("3 Minutes Left!!!")
    pygame.display.update() # Update screen after filling it

    font = pygame.font.Font('freesansbold.ttf', 18)

    intro_1 = font.render('3', True, (255,255,255))
    intro_2 = font.render('Minutes', True, (255,255,255))
    intro_3 = font.render('Left!!!', True, (255,255,255))

    time.sleep(1)
    pygame.display.update(screen.blit(intro_1, (140, 30)))
    time.sleep(1)
    pygame.display.update(screen.blit(intro_2, (340, 30))) 
    time.sleep(1)
    pygame.display.update(screen.blit(intro_3, (540, 30)))

    while pygame.event.wait().type != QUIT:
        pass

Main()

如何在 pygame 中以正确的方式使用 blit()？

How do I use blit() in the proper way in pygame?

python

pygame

python-3.x

pygame-surface