写一段飞机小游戏的代码

下面是一个使用Python和Pygame库编写的简单飞机小游戏的代码，玩家控制飞机躲避障碍物并尽可能地获得高分：

import pygame
import random

# 定义游戏区域大小
WIDTH = 480
HEIGHT = 600

# 定义颜色
WHITE = (255, 255, 255)
BLACK = (0, 0, 0)

# 初始化pygame
pygame.init()

# 创建游戏窗口
screen = pygame.display.set_mode((WIDTH, HEIGHT))
pygame.display.set_caption("飞机小游戏")

# 加载图片资源
background_img = pygame.image.load("background.png").convert()
player_img = pygame.image.load("player.png").convert_alpha()
enemy_img = pygame.image.load("enemy.png").convert_alpha()

# 定义游戏对象类
class GameObject:
    def __init__(self, x, y, img):
        self.x = x
        self.y = y
        self.img = img
        self.width = img.get_width()
        self.height = img.get_height()

    def draw(self):
        screen.blit(self.img, (self.x, self.y))

# 定义玩家类
class Player(GameObject):
    def move(self, dx, dy):
        self.x += dx
        self.y += dy
        if self.x < 0:
            self.x = 0
        elif self.x > WIDTH - self.width:
            self.x = WIDTH - self.width
        if self.y < 0:
            self.y = 0
        elif self.y > HEIGHT - self.height:
            self.y = HEIGHT - self.height

# 定义敌人类
class Enemy(GameObject):
    def move(self):
        self.y += 5
        if self.y > HEIGHT:
            self.reset()

    def reset(self):
        self.x = random.randint(0, WIDTH - self.width)
        self.y = random.randint(-HEIGHT, -self.height)

# 创建游戏对象
background = GameObject(0, 0, background_img)
player = Player(WIDTH//2, HEIGHT-100, player_img)
enemies = []
for i in range(5):
    enemy = Enemy(random.randint(0, WIDTH-enemy_img.get_width()), random.randint(-HEIGHT, 0), enemy_img)
    enemies.append(enemy)

# 定义游戏循环
running = True
score = 0
font = pygame.font.SysFont("Arial", 32)
while running:
    # 处理事件
    for event in pygame.event.get():
        if event.type == pygame.QUIT:
            running = False
        elif event.type == pygame.KEYDOWN:
            if event.key == pygame.K_LEFT:
                player.move(-5, 0)
            elif event.key == pygame.K_RIGHT:
                player.move(5, 0)
            elif event.key == pygame.K_UP:
                player.move(0, -5)
            elif event.key == pygame.K_DOWN:
                player.move(0, 5)

    # 更新游戏对象
    for enemy in enemies:
        enemy.move()
        if enemy.y + enemy.height > player.y and enemy.y < player.y + player.height and enemy.x + enemy.width > player.x and enemy.x < player.x + player.width:
            running = False
        if enemy.y > HEIGHT:
            score += 1
            enemy.reset()
    score_text = font.render("Score: %d" % score, True, BLACK)

    # 绘制游戏场景
    background.draw()
    player.draw()
    for enemy in enemies:
        enemy.draw()
    screen.blit(score_text, (10, 10))

    # 刷新屏幕
    pygame.display.flip()

# 游戏结束
gameover_text = font.render("Game Over", True, BLACK)
screen.blit(gameover_text, (WIDTH//2-80, HEIGHT//2-16))
pygame.display.flip()
pygame.time.delay(2000)

# 退出游戏
pygame.quit()

在运行游戏之前，需要准备好游戏所需的图片资源，例如背景图、玩家图、敌人图等。将这些图片保存在与游戏代码相同的目录下，并按照代码中的文件名进行命名即可。运行代码后，即可在Pygame窗口中玩这个小游戏。