python飞机大战有游戏背景我方飞机以及子弹的代码

下面是Python飞机大战游戏背景、我方飞机和子弹的代码：

游戏背景代码：

import pygame

class Background(pygame.sprite.Sprite):
    def __init__(self, bg_size):
        pygame.sprite.Sprite.__init__(self)

        self.image = pygame.image.load("images/background.png").convert_alpha()
        self.rect = self.image.get_rect()
        self.width, self.height = bg_size[0], bg_size[1]
        self.speed = 1
        self.rect.left, self.rect.top = (0, 0)

    def move(self):
        self.rect.top += self.speed
        if self.rect.top >= self.height:
            self.rect.top = -self.height

我方飞机代码：

import pygame

class MyPlane(pygame.sprite.Sprite):
    def __init__(self, bg_size):
        pygame.sprite.Sprite.__init__(self)

        self.image1 = pygame.image.load("images/me1.png").convert_alpha()
        self.image2 = pygame.image.load("images/me2.png").convert_alpha()
        self.destroy_images = []
        self.destroy_images.extend([pygame.image.load("images/me_destroy_1.png").convert_alpha(),
                                    pygame.image.load("images/me_destroy_2.png").convert_alpha(),
                                    pygame.image.load("images/me_destroy_3.png").convert_alpha(),
                                    pygame.image.load("images/me_destroy_4.png").convert_alpha()])
        self.rect = self.image1.get_rect()
        self.width, self.height = bg_size[0], bg_size[1]
        self.rect.left, self.rect.top = (self.width - self.rect.width) // 2, self.height - self.rect.height - 60
        self.speed = 10
        self.active = True
        self.invincible = False
        self.mask = pygame.mask.from_surface(self.image1)

    def move_up(self):
        if self.rect.top > 0:
            self.rect.top -= self.speed
        else:
            self.rect.top = 0

    def move_down(self):
        if self.rect.bottom < self.height - 60:
            self.rect.top += self.speed
        else:
            self.rect.bottom = self.height - 60

    def move_left(self):
        if self.rect.left > 0:
            self.rect.left -= self.speed
        else:
            self.rect.left = 0

    def move_right(self):
        if self.rect.right < self.width:
            self.rect.right += self.speed
        else:
            self.rect.right = self.width

    def reset(self):
        self.rect.left, self.rect.top = (self.width - self.rect.width) // 2, self.height - self.rect.height - 60
        self.active = True
        self.invincible = True

子弹代码：

import pygame

class Bullet(pygame.sprite.Sprite):
    def __init__(self, position):
        pygame.sprite.Sprite.__init__(self)

        self.image = pygame.image.load("images/bullet.png").convert_alpha()
        self.rect = self.image.get_rect()
        self.rect.left, self.rect.top = position
        self.speed = 12
        self.active = True
        self.mask = pygame.mask.from_surface(self.image)

    def move(self):
        self.rect.top -= self.speed
        if self.rect.top < 0:
            self.active = False

    def reset(self, position):
        self.rect.left, self.rect.top = position
        self.active = True