pygame渲染问题答案

【问题标题】：Trouble with pygame renderingpygame渲染问题
【发布时间】：2020-12-10 15:50:11
【问题描述】：

我遇到了一个问题，pygame 只渲染一个黑屏，上面有一条奇怪的绿线。

我正在关注 RealPython.com 上的教程，第一次尝试一切顺利。一旦我做了第二次尝试，这就是渲染，这显然是错误的。

#sidescrolling air-shooter
import pygame
#import pygame locals
from pygame.locals import(
    K_UP,
    K_DOWN,
    K_LEFT,
    K_RIGHT,
    K_ESCAPE,
    KEYDOWN,
    QUIT,
)

#constants for screen width/height
SCREEN_WIDTH = 800
SCREEN_HEIGHT = 600
class Player(pygame.sprite.Sprite):
       def __init__(self):
        super(Player, self).__init__()
        self.surf = pygame.Surface((75,25))
        self.surf.fill((255, 255,255))
        self.rect = self.surf.get_rect()

pygame.init()
#create screen
screen = pygame.display.set_mode((SCREEN_WIDTH, SCREEN_HEIGHT))

# Instantiate player
player = Player()
#keep the game running!
running = True

#loop time!
while running:
    #look at all the events
    for event in pygame.event.get():
        #did the user hit a key?
        if event.type == KEYDOWN:
            #Was it escape?  uh oh we gotta stop
            if event.key == K_ESCAPE:
                running = False

        elif event.type ==QUIT:
            running = False

#fill screen with white
screen.fill((255, 255, 255))

# Create a surface and pass in a tuple containing legth and width
surf = pygame.Surface((50, 50))

# Give the surface a color to separate it from the Background
surf.fill((0, 0, 0))
rect = surf.get_rect()

#This line says "Draw surf onto the screen at the center"
screen.blit(surf, (SCREEN_WIDTH/2, SCREEN_HEIGHT/2))
#Draw the player on the screen
screen.blit(player.surf, (SCREEN_WIDTH/2, SCREEN_HEIGHT/2))
pygame.display.flip()
pygame.quit()

我什至检查了他们项目的源代码，它似乎匹配。

【问题讨论】：

标签： python pygame

【解决方案1】：

这是Indentation 的问题。您需要在应用程序循环中绘制场景并更新显示in，而不是在应用程序循环之后：

#loop time!
while running:
    #look at all the events
    for event in pygame.event.get():
        #did the user hit a key?
        if event.type == KEYDOWN:
            #Was it escape?  uh oh we gotta stop
            if event.key == K_ESCAPE:
                running = False

        elif event.type ==QUIT:
            running = False

    #-->| INDENTATION

    #fill screen with white
    screen.fill((255, 255, 255))

    # Create a surface and pass in a tuple containing legth and width
    surf = pygame.Surface((50, 50))

    # Give the surface a color to separate it from the Background
    surf.fill((0, 0, 0))
    rect = surf.get_rect()

    #This line says "Draw surf onto the screen at the center"
    screen.blit(surf, (SCREEN_WIDTH/2, SCREEN_HEIGHT/2))
    #Draw the player on the screen
    screen.blit(player.surf, (SCREEN_WIDTH/2, SCREEN_HEIGHT/2))
    pygame.display.flip()

pygame.quit()

【讨论】：