Question

我正在使用Eric Matthes写的一本叫做《 Python速成班》的书。本书的一部分涉及python代码项目，我开始为Alien Invasion游戏编写代码。我附带了到目前为止编写的代码，以使游戏能够正常工作，但是无论何时运行代码，无论按下键盘的向右键还是向左键，飞船都不会移动。我已经运行了几次代码，但是我的编辑器没有指出有错误。我需要在代码中修复某些问题吗？如果有人知道如何解决此问题，我将不胜感激。 Alien_invasion.py代码：

import sys

import pygame

from settings import Settings
from ship import Ship

class AlienInvasion:
    """Overall class to manage game assets and behavior."""

    def __init__(self):
        """Initialize the game, and create game resources."""
        pygame.init()
        self.settings = Settings()

        self.screen = pygame.display.set_mode((self.settings.screen_width, self.settings.screen_height))
        pygame.display.set_caption("Alien Invasion")

        self.ship = Ship(self)

        # Set the background color.
        self.bg_color = (230, 230, 230)

    def run_game(self):
        """Start the main loop for the game."""
        while True:
            self._check_events()
            self.ship.update()
            self._update_screen()
            # Redraw the screen during each pass through the loop.
    def _check_events(self):
        """Respond to keypresses and mouse events."""
        for event in pygame.event.get():
            if event.type == pygame.QUIT:
                sys.exit()
            elif event.type == pygame.KEYDOWN:
                if event.key == pygame.K_RIGHT:
                    self.ship.moving_right = True
                elif event.key == pygame.K_LEFT:
                    self.ship.moving_left = True

            elif event.type == pygame.KEYUP:
                if event.key == pygame.K_RIGHT:
                    self.ship.moving_right = False
                elif event.key == pygame.K_LEFT:
                    self.ship.moving_left = False

                    # Move the ship to the right.
                    self.ship.rect.x += 1

    def _update_screen(self):
        """Update images on the screen, and flip to the new screen."""
        self.screen.fill(self.settings.bg_color)
        self.ship.blitme()

        pygame.display.flip()

if __name__ == '__main__':
    # Make a game instance, and run the game.
    ai = AlienInvasion()
    ai.run_game()

Ship.py代码：

import pygame

class Ship:
    """A class to manage the ship."""

    def __init__(self, ai_game):
        """Initialize the ship and set its starting position."""
        self.screen = ai_game.screen
        self.screen_rect = ai_game.screen.get_rect()

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

        # Movement flags
        self.moving_right = False
        self.moving_left = False

    def update(self):
        """Update the ship's position based on the movement flag."""
        if self.moving_right:
            self.rect.x += 1
        if self.moving_left:
            self.rect.x -= 1

        # Start each new ship at the bottom center of the screen.
        self.rect.midbottom = self.screen_rect.midbottom

    def blitme(self):
        """Draw the ship at its current location."""
        self.screen.blit(self.image, self.rect)

Settings.py代码：

class Settings:
    """A class to store all settings for Alien Invasion."""

    def __init__(self):
        """Initialize the game's settings."""
        # Screen settings
        self.screen_width = 1200
        self.screen_height = 800
        self.bg_color = (230, 230, 230)

Answer 1

我让代码正常工作，这是一个错字错误。

    if event.type == pygame.QUIT:
        sys.exit()
    elif event.type == pygame.KEYDOWN:
        if **event.key** == pygame.K_RIGHT: 
            self.ship.moving_right = True
        elif **event.key** == pygame.K_LEFT:
            self.ship.moving_left = True

    elif event.type == pygame.KEYUP:
        if **event.key** == pygame.K_RIGHT:
            self.ship.moving_right = False
        elif **event.key** == pygame.K_LEFT:
            self.ship.moving_left = False

我以前编码的是event.type而不是event.key

代码正在运行，将继续在项目上工作。

宇宙飞船的图像无法移动。我的代码有错误吗？

1 个答案: