import pygame
import random
from sys import exit #向 sys 模块借用个 exit 函数来退出程序

定义一个敌机类

class Enemy:

def restar(self):
    #重置敌机地位与速度
    self.x=random.randint(100,600)
    self.y=random.randint(-200,-80)
    self.speed=random.random()+0.4
def __init__(self):
    self.restar()
    self.image=pygame.image.load('enermy.jpg')
def move(self):
    if self.y < 800:
        self.y+=self.speed  #向下挪动
    else:
        self.restar()

定义一个 bullet 类，封装子弹相干的数据和办法

class Bullet:

def __init__(self):
    self.x=0;
    self.y=-1;
    self.image=pygame.image.load('bulet.jpg')
    self.active=False  #默认不激活子弹

def move(self):
    #激活状态下，向上挪动
    if self.active:
        self.y-=0.8
    #挡飞出屏幕，设为不激活
    if self.yenemy.x and bullet.x < enemy.x + enemy.image.get_width()) and (bullet.y > enemy.ywww.cungun.com and bullet.y < enemy.y + enemy.image.get_height()
    ):
    enemy.restar();
    bullet.active=False
    return True
return False

class Plane:

def restar(self):
    self.x=200
    self.y=600
def __init__(self):
    self.restar()
    self.image=pygame.image.load('plane.jpg')
def move(self):
    x, y = pygame.mouse.get_pos();  # 追随鼠标挪动
    x -= self.image.get_width() / 2;
    y -= self.image.get_height() / 2;
    self.x=x;
    self.y=y

def checkcrash(enemy, plane):

if (plane.x + 0.7*plane.image.get_width() > enemy.x) and (plane.x + 0.3*plane.image.get_width() < enemy.x + enemy.image.get_width()) and (plane.y + 0.7*plane.image.get_height() > enemy.y) and (plane.y + 0.3*plane.image.get_width() < enemy.y + enemy.image.get_height()):
    return True
return False

pygame.init()
screen=pygame.display.set_mode((1000,700),0,32) #创立一个窗口
pygame.display.set_caption(‘xwr!’)# 设置窗口题目
background=pygame.image.load(‘pygame.jpg’) #加载并转换图像
plane=Plane()# 加载飞机游戏图像
bullets=[]# 创立子弹的 list
for i in range(5):

bullets.append(Bullet())  #向 list 增加 5 发子弹 

count_b=len(bullets)# 子弹总数
index_b=0 #行将激活的子弹序号
interval_b=0# 发射子弹的距离
enemies=[]
for e in range(5):

enemies.append(Enemy())

gameover = False

分数

score = 0

用以显示文字的 font 变量

font = pygame.font.Font(None, 32)
while True: #游戏主循环函数

for event in pygame.event.get():
    if event.type==pygame.QUIT:  #接管到退出事件后退出程序
        pygame.quit()
        exit()
    if gameover and event.type==pygame.MOUSEBUTTONUP:
        plane.restar()
        for e in enemies:
            e.restar()
        for b in bullets:
            b.restar()
        score=0;
        gameover=False
screen.blit(background, (0, 0))  # 将背景图画下来
if not gameover:
    interval_b-=1  #发射距离递加
    if interval_b<0:   #激活一发子弹

        bullets[index_b].restar()
        interval_b=80  #重置间隔时间
        index_b=(index_b+1)%count_b# 子弹序号周期性递增
    for b in bullets:  #处于激活状态的子弹，挪动地位并绘制
        if b.active:

            for e in enemies:
                if checkhit(e,b):
                    score+=100
            b.move()
            screen.blit(b.image,(b.x,b.y))
    for e in enemies:
        if checkcrash(e, plane):
            gameover = True
        e.move()
        screen.blit(e.image,(e.x,e.y))
    plane.move()
    screen.blit(plane.image, (plane.x, plane.y))
    # 在屏幕左上角显示分数
    text = font.render("Socre: %d" % score, 1, (0, 0, 0))
    screen.blit(text, (0, 0))
else:
    # 在屏幕地方显示分数
    text = font.render("Socre: %d" % score, 1, (0, 0, 0))
    screen.blit(text, (190, 400))
    pass
pygame.display.update()  #刷新一下界面