Question

我刚开始使用pygame。即使我的Player实例的x值已相应更改，其位置也不在曲面上更新。

'''__main__.py'''
import script

if __name__ == '__main__':
    script.setup()
    script.update()

-

'''script.py'''
import pygame
from player import Player
from enemy import Enemy
from ball import Ball


def setup():
    global window, player, enemy, ball

    pygame.init()
    pygame.display.set_caption('Pong')
    window = pygame.display.set_mode((800, 600))

    player = Player(40, window.get_height() / 2 - 100 / 2, 20, 100)
    enemy = Enemy(window.get_width() - 40 - 20, window.get_height() / 2 - 100 / 2, 20, 100)


def draw():
    player.update()
    enemy.update()
    pygame.display.update()

    player.draw(window)
    enemy.draw(window)

def update():

    running = True
    while running:
        for event in pygame.event.get():
            if event.type == pygame.QUIT:
                running = False


        keys = pygame.key.get_pressed()

        if keys[pygame.K_UP]:
            player.up = True
        if keys[pygame.K_DOWN]:
            player.down = True

        if not keys[pygame.K_UP]:
            player.up = False
        if not keys[pygame.K_DOWN]:
            player.down = False

        draw()


    pygame.quit()

-

'''player.py'''
import pygame

class Player:
    '''Player'''
    def __init__(self, x, y, width, height):
        self.x = x
        self.y = y
        self.width = width
        self.height = height
        self.color = (255, 255, 255)
        self.rect = (self.x, self.y, self.width, self.height)
        self.vel = 10
        self.up = False
        self.down = False

    def draw(self, surface):
        pygame.draw.rect(surface, self.color, self.rect)

    def update(self):
        if self.up:
            self.x -= self.vel
        if self.down:
            self.x += self.vel

当我向上或向下按下时，实例的x值会更改，但由于某种原因，它不会在屏幕上绘制。我尝试过移动draw方法和player.update方法，但似乎无法使其正常工作。

Answer 1

查看Player.draw方法。它使用self.rect绘制。

您的update方法的问题在于它永远不会更新self.rect。因此，self.rect与after构造函数相同。

删除self.rect作为属性，然后将其替换为简单方法（选项A）或属性（选项B）：

class Player:
    # Options A:
    def get_rect(self):
        return (self.x, self.y, self.width, self.height)

    # Option B:
    @property
    def rect(self):
        return (self.x, self.y, self.width, self.height)

或在self.rect方法内更新update。但我不建议这样做。单独拥有它是您首先遇到无位置错误的原因。

OOP pygame运动问题

1 个答案: