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()+0.4def __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 Truereturn False

class Plane:

def restar(self):    self.x=200    self.y=600def __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 Truereturn 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=Falsescreen.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))    passpygame.display.update()  #刷新一下界面