如何在 pygame 中以正确的方式使用 blit()？ [复制]

Question

我试图制作一个纹理游戏，但它无法正常工作且没有错误。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()

然后我启动了这个程序。但是 pygame tab 没有任何反应。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()

再一次，没有回应。我该如何解决这个问题？？？

Answer 1

窗口没有响应，因为您没有处理事件。您在窗口中看不到任何内容，因为您没有更新显示。
一个最小的典型 PyGame 应用程序

• 需要一个游戏循环

• 必须通过pygame.event.pump() 或pygame.event.get() 处理事件。

• 必须通过pygame.display.flip() 或pygame.display.update() 更新显示Surface。

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

您需要在每次绘制/blit 时更新屏幕，否则更改将不会显示。

无论您是在循环内还是在函数中更改内容都没有关系，重要的是您通过调用pygame.display.flip()（更新整个屏幕）或pygame.display.update()（更新整个屏幕）来更新屏幕屏幕或传递给它的矩形。在这个示例中，我使用了 blitting 返回的矩形来仅更新特定区域，还添加了一个简单的游戏循环来处理事件，因此您的游戏将具有响应性并且您可以退出它：

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()