我的 pygame Alien Invasion 的第一部分有什么遗漏吗？

Question

更新： 根据答案，我尝试了一些更改。 我改变了ship.py的部分

def update(self):

   if self.moving_up and self.rect.top < self.screen_rect.top:
       self.rect.centery += self.ai_settings.ship_speed_fator
   if self.moving_down and self.rect.bottom > 0:
       self.rect.centery -= self.ai_settings.ship_speed_factor

   # update the rect based on the self.center
   self.rect.centery = self.center 

进入下一个：

    def update(self):
        """based on the moving signal to change the ship's position"""
        #update the ship's center value, not the rect
        if self.moving_up and self.rect.top < self.screen_rect.top:
            self.rect.center += self.ai_settings.ship_speed_fator
        if self.moving_down and self.rect.bottom > 0:
            self.rect.center -= self.ai_settings.ship_speed_factor

        # update the rect based on the self.center
        self.rect.centery = self.center

但仍然无法正常工作。 感觉不好。

---

我尝试使用教科书教我的相同方式制作类似的pygame，但现在被堆叠了。游戏名为Alien Invasion，被誉为python新手的初试和教科书Python Crash Course的项目。

我已经学习了 Python 速成课程第 12 章，并且我自己输入了教科书的每一行代码。我以为我理解他们。 所以我把游戏转成地平线版本。但我失败了。我无法使用上下键来控制我的船，有人可以帮助我吗？我把它放在我的github上，链接https://github.com/Ruwzy/Python-Crash-Course-Practises/tree/master/PCC_12/Practice_12_5，还有下面的代码。

settings.py

class Settings():
"""Store all the classes of the Alien_Invasion's settings"""

  def __init__(self):
      """ initialize the game's setting"""
      # Screen Settings
      self.screen_width = 1600
      self.screen_height = 800
      self.bg_color = (230, 230, 230)

      # ship settings
      self.ship_speed_factor = 1.5

game_functions.py

import sys

import pygame


def check_keydown_events(event, ship):
    """response to the keydown"""
    if event.key == pygame.K_UP:
        ship.moving_up = True
    elif event.key == pygame.K_DOWN:
        ship.moving_down = True

def check_keyup_events(event, ship):
    """response to the keyup"""
    if event.key == pygame.K_UP:
        ship.moving_up = False
    elif event.key == pygame.K_DOWN:
        ship.moving_down = False

def check_events(ship):
    """response to the keyboard and the mouse"""
    for event in pygame.event.get():
        if event.type == pygame.QUIT:
            sys.exit()
        elif event.type == pygame.KEYDOWN:
            check_keydown_events(event, ship)
        elif event.type == pygame.KEYUP:
            check_keyup_events(event, ship)

def update_screen(ai_settings, screen, ship):
    """update the screen's image, and change to the new screen"""
    # Redraw the screen each time starts the loop
    screen.fill(ai_settings.bg_color)
    ship.blitme()

    # show the lastest drawing screen
    pygame.display.flip()

ship.py

import pygame

class Ship():

    def __init__(self, ai_settings, screen):
        """ initialize the ship and set its original position"""
        self.screen = screen
        self.ai_settings = ai_settings

        # load the ship's image and get its rect
        self.image = pygame.image.load('images/ship.bmp')
        self.rect = self.image.get_rect()
        self.screen_rect = screen.get_rect()

        # set every new ship to the center of left
        self.rect.center = self.screen_rect.midleft
        self.rect.left = self.screen_rect.left

        #store float type value in setting center
        self.center = float(self.rect.centery)

        # moving signal
        self.moving_up = False
        self.moving_down = False

    def update(self):
        """based on the moving signal to change the ship's position"""
        #update the ship's center value, not the rect
        if self.moving_up and self.rect.top < self.screen_rect.top:
            self.rect.centery += self.ai_settings.ship_speed_fator
        if self.moving_down and self.rect.bottom > 0:
            self.rect.centery -= self.ai_settings.ship_speed_factor

        # update the rect based on the self.center
        self.rect.centery = self.center 

    def blitme(self):
        """ draw the ship at a certain position"""
        self.screen.blit(self.image, self.rect)

外星人入侵.py

import sys

import pygame

from settings import Settings

from ship import Ship

import game_functions as gf 


def run_game():
    """ initialize the game and creat a screen"""
    pygame.init()
    ai_settings = Settings()
    screen = pygame.display.set_mode((ai_settings.screen_width, ai_settings.screen_height))
    pygame.display.set_caption("Alien_Invasion")

    # built a ship
    ship = Ship(ai_settings, screen)

 # Start the game's main loop
    while True:
        gf.check_events(ship)
        ship.update()
        gf.update_screen(ai_settings, screen, ship)

run_game()

我无法让船上下移动，希望有人能帮助我。我确实花了很多时间来调试它。

Answer 1

问题是由update方法引起的：

def update(self):

   if self.moving_up and self.rect.top < self.screen_rect.top:
       self.rect.centery += self.ai_settings.ship_speed_fator
   if self.moving_down and self.rect.bottom > 0:
       self.rect.centery -= self.ai_settings.ship_speed_factor

   # update the rect based on the self.center
   self.rect.centery = self.center 

在这个方法中self.rect.centery被改变了，但最后它被elf.rect.centery = self.center覆盖了。
将其更改为：

def update(self):

    if self.moving_up and self.rect.top < self.screen_rect.top:
        self.center += self.ai_settings.ship_speed_fator
    if self.moving_down and self.rect.bottom > 0:
        self.center -= self.ai_settings.ship_speed_factor

    # update the rect based on the self.center
    self.rect.centery = round(self.center)