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

Question

您好，我正在尝试在 pygame 中创建一个角色扮演游戏但是，每次我尝试运行测试它的代码时，它都会告诉我 "descriptor 'blit' of 'pygame.Surface' object needs an argument"

我想我已经给它一个论据了。

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)

我希望它打开时出现白屏。也许能够看到图片。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论点

Answer 1

看来您正在尝试学习如何在 Python 中编写代码并同时使用 Pygame 库。我不推荐这个；首先学习更多的代码编写基础知识。但我会尽力解决你的困惑：

but all it does is

对；启动过程中出现错误，因此还无法显示任何内容。

which i thought i gave it an argument when i told it the place to find the picture and it x and y coords

关键在于 descriptor 和 object 这两个词。 pygame.Surface is a class, and blit 是 class 的的 方法，但您正试图将其用作普通函数。

您需要创建 class 的实例并使用其方法。您已经有这样一个实例：它被称为 screen，它是由 pygame.display.set_mode 创建的。所以现在我们可以，例如，screen.blit(playerimg, (x, y)).

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

发生这种情况是因为您将 player 定义为接受 x 和 y 值，但是在代码外部函数中，您尝试使用 x 和 y 从外部函数调用它 - 这不存在。请仔细研究例子：

def player(x, y): # We don't need to define x and y inside, because they will be given to us # if we do assign some values, it replaces what we were passed in. # This is bad, because the point is to let the outside code decide. print(f"I was passed in: x = {x}, y = {y}") x = 1 y = 2 # this requires the above; it has nothing to do with x and y inside the function. player(x, y) # but we can use different names: a = 1 b = 2 player(a, b) # or no names at all: player(1, 2)

(再一次；先学习更多的代码编写基础知识；然后当这样的事情发生时以及为什么发生时，您将很明显，并且您将能够在第一时间正确修复它，并理解为什么正确修复是正确的。）

Answer 2

pygame.Surface.blit is a Method 和第二个参数 (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))

同样适用于pygame.Surface.fill

screen.fill(white)

请注意，pygame.Surface 对象上的操作 .blit() 和 .fill() 运算符。如果你想 fill 显示器或 blit 显示器上的东西，那么你必须使用与显示器相关联的表面。在你的情况下，这是 screen;

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)

此外，您还需要绘制 player，在清除显示之后和更新显示之前：

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

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

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

python

pygame

blit