python - "descriptor ' blit ' of ' pygame.Surface ' object needs an argument"

Question

你好，我正在尝试在 pygame 中创建一个角色扮演游戏但是，每次我尝试运行代码来测试它时，它都会告诉我“‘pygame.Surface’对象的描述符‘blit’需要一个参数”

我相信我已经对其进行了论证。

import pygame
import os
from pygame.locals import*

screen_width = 1900
screen_height = 1080

black = (0, 0, 0)
white = (255, 255 ,255)
red = (255, 0 ,0)
lime = (0, 255, 0)
blue = (255, 255, 0)
aqua = (0, 255, 255)
magenta = (255, 0, 255)
silver = (192, 192, 192)
gray = (128, 128, 128)
maroon = (128, 0, 0)
olive = (128, 128, 0)
green = (0, 128, 0)
purple = (128, 0, 128)
teal = (0, 128, 128)
navy = (0, 0, 128)

pygame.display.init()
screen = pygame.display.set_mode([screen_width, screen_height])
pygame.display.set_caption('This is a rpg')
clock = pygame.time.Clock()

current_path = os.path.dirname('untitled')
resource_path = os.path.join(current_path, 'Characters')
character_path = os.path.join(resource_path, 'Knight')
image_path = os.path.join(character_path, 'Walk_Attack')

playerimg = pygame.image.load(os.path.join(character_path, 'knight.png'))

x = (screen_width * 0.45) 
# I only put it up here because it told me "x" wasent defined in "def player(x, y):"

y = (screen_height * 0.8)

def player(x, y):
    x = (screen_width * 0.45)
    y = (screen_height * 0.8)
    pygame.Surface.blit(source = playerimg, x = x, y = y)

dead = False

while not dead:
    for event in pygame.event.get():
        if event.type == pygame.QUIT:
            dead = True
    player(x, y)
    pygame.Surface.fill(white)
    pygame.display.flip()
    clock.tick(60)
pygame.quit()
quit()

screen.fill(white)

我希望它打开时会出现白屏。也许可以看到图片。但它所做的只是告诉我 blit 需要一个参数。当我告诉它找到图片的位置以及它的 x 和 y 坐标时，我以为我给了它一个参数

Answer 1

pygame.Surface.blit是 Method第二个参数 (dest) 是一个包含 2 个组件的位置元组，因此它必须是:

screen.blit(source = playerimg, dest = (x, y))

这同样适用于pygame.Surface.fill

screen.fill(white)

请注意，pygame.Surface 上的操作 .blit() 和 .fill() 运算符目的。如果您想填充显示器或blit显示器上的某些内容，那么您必须使用与显示器关联的Surface。在您的情况下，这是屏幕；

screen = pygame.display.set_mode([screen_width, screen_height])

或者你可以这样做:

pygame.Surface.blit(screen, playerimg, (x, y))

分别

pygame.Surface.fill(screen, white)

<小时/>

此外，您还必须在清除显示之后和更新显示之前绘制玩家:

screen.fill(white)
player(x, y)
pygame.display.flip()