外星人入侵全代码版（二）

外星人入侵全代码版（二）

游戏介绍

在游戏《外星人入侵》中，玩家控制着一艘最初出现在屏幕底部中央的飞船。玩家 可以使用箭头键左右移动飞船，还可使用空格键进行射击。游戏开始时，一群外星人出 现在天空中，他们在屏幕中向下移动。玩家的任务是射杀这些外星人。玩家将所有外星 人都消灭干净后，将出现一群新的外星人，他们移动的速度更快。只要有外星人撞到了 玩家的飞船或到达了屏幕底部，玩家就损失一艘飞船。玩家损失三艘飞船后，游戏结束。

外星人的类

文件名：alien.py

import pygame as ga
from pygame.sprite import Sprite

class Alien(Sprite):
    '''表示单个外星人的类'''
    def __init__(self,ai_settings,screen):
        '''初始化外星人并设置初始位置'''
        super(Alien,self).__init__()
        self.screen = screen
        self.ai_settings = ai_settings

        #加载外星人图像，并设置其rect属性
        self.image = ga.image.load('images/alien.bmp')
        self.rect = self.image.get_rect()

        #每个外星人最初都在屏幕左上角附近
        self.rect.x = self.rect.width
        self.rect.y = self.rect.height

        #存储外星人的准确位置
        self.x = float(self.rect.x)

    def blitme(self):
        '''在指定位置绘制外星人'''
        self.screen.blit(self.image, self.rect)

    def check_edges(self):
        '''如果外星人位于屏幕边缘，就返回True'''
        screen_rect = self.screen.get_rect()
        if self.rect.right >= screen_rect.right:
            return True
        elif self.rect.left <= 0 :
            return True

    def update(self):
        '''向右或向左移动外星人'''
        self.x += (self.ai_settings.alien_speed_factor * self.ai_settings.fleet_direction)
        self.rect.x = self.x

子弹设置

文件名：bullet.py

#子弹设置
import pygame as ga
from pygame.sprite import Sprite

class Bullet(Sprite):
      '''一个对飞船发射子弹进行管理的类'''

      def __init__(self,ai_settings,screen,ship):
            '''在飞船所处的位置创建一个子弹对象'''
            super(Bullet, self).__init__()
            self.screen = screen

            #在（0,0）处创建一个表示子弹的矩形，再设置正确的位置
            self.rect = ga.Rect(0,0,ai_settings.bullet_width,
                                ai_settings.bullet_height)
            self.rect.centerx = ship.rect.centerx
            self.rect.top = ship.rect.top

            #存储用小数表示的子弹位置
            self.y = float(self.rect.y)

            self.color = ai_settings.bullet_color
            self.speed_factor = ai_settings.bullet_speed_factor


      def update(self):
            '''向上移动子弹'''
            #更新表示子弹位数的小数值
            self.y -= self.speed_factor
            #更新表示子弹的rect位置
            self.rect.y = self.y

      def draw_bullet(self):
            '''在屏幕上绘制子弹'''
            ga.draw.rect( self.screen, self.color, self.rect)
            
            

按钮

文件名：button.py

#创建按钮
import pygame as ga

class Button():
    def __init__(self, ai_settings, screen, msg):
        '''初始化按钮属性'''
        self.screen = screen
        self.screen_rect = screen.get_rect()

        #设置按钮的属性和尺寸
        self.width, self.height = 200,50
        self.button_color = (0, 255, 0)
        self.text_color = (255, 255, 255)
        self.font = ga.font.SysFont(None, 48)

        #创建按钮的rect对象，并使其居中
        self.rect = ga.Rect(0, 0, self.width, self.height)
        self.rect.center = self.screen_rect.center

        #按钮标签只需创建一次
        self.prep_msg(msg)

    def prep_msg(self,msg):
        '''将msg渲染为图像，并使其在按钮上居中'''
        self.msg_image = self.font.render(msg, True, self.text_color,
                                          self.button_color)
        self.msg_image_rect = self.msg_image.get_rect()
        self.msg_image_rect.center = self.rect.center

    def draw_button(self):
        #绘制一个用颜色填充的按钮，再绘制文本
        self.screen.fill(self.button_color, self.rect)
        self.screen.blit(self.msg_image, self.msg_image_rect)

计分（最高分，当前分）类

文件名：scoreboard.py

import pygame.font
from pygame.sprite import Group

from ship import Ship

class Scoreboard():
    """A class to report scoring information."""

    def __init__(self, ai_settings, screen, stats):
        """Initialize scorekeeping attributes."""
        self.screen = screen
        self.screen_rect = screen.get_rect()
        self.ai_settings = ai_settings
        self.stats = stats
        
        # Font settings for scoring information.
        self.text_color = (30, 30, 30)
        self.font = pygame.font.SysFont(None, 48)

        # Prepare the initial score images.
        self.prep_score()
        self.prep_high_score()
        self.prep_level()
        self.prep_ships()

    def prep_score(self):
        """Turn the score into a rendered image."""
        rounded_score = int(round(self.stats.score, -1))
        score_str = "{:,}".format(rounded_score)
        self.score_image = self.font.render(score_str, True, self.text_color,
            self.ai_settings.bg_color)
            
        # Display the score at the top right of the screen.
        self.score_rect = self.score_image.get_rect()
        self.score_rect.right = self.screen_rect.right - 20
        self.score_rect.top = 20
        
    def prep_high_score(self):
        """Turn the high score into a rendered image."""
        high_score = int(round(self.stats.high_score, -1))
        high_score_str = "{:,}".format(high_score)
        self.high_score_image = self.font.render(high_score_str, True,
            self.text_color, self.ai_settings.bg_color)
                
        # Center the high score at the top of the screen.
        self.high_score_rect = self.high_score_image.get_rect()
        self.high_score_rect.centerx = self.screen_rect.centerx
        self.high_score_rect.top = self.score_rect.top
        
    def prep_level(self):
        """Turn the level into a rendered image."""
        self.level_image = self.font.render(str(self.stats.level), True,
                self.text_color, self.ai_settings.bg_color)
        
        # Position the level below the score.
        self.level_rect = self.level_image.get_rect()
        self.level_rect.right = self.score_rect.right
        self.level_rect.top = self.score_rect.bottom + 10
        
    def prep_ships(self):
        """Show how many ships are left."""
        self.ships = Group()
        for ship_number in range(self.stats.ships_left):
            ship = Ship(self.ai_settings, self.screen)
            ship.rect.x = 10 + ship_number * ship.rect.width
            ship.rect.y = 10
            self.ships.add(ship)
        
    def show_score(self):
        """Draw score to the screen."""
        self.screen.blit(self.score_image, self.score_rect)
        self.screen.blit(self.high_score_image, self.high_score_rect)
        self.screen.blit(self.level_image, self.level_rect)
        # Draw ships.
        self.ships.draw(self.screen)

类的设置

文件名：settings.py

#类的设置
class Settings():
      '''存储所有设置的类'''
      def __init__(self):
            '''初始化游戏的静态设置'''
            #屏幕设置
            self.screen_width = 1200
            self.screen_height = 800
            self.bg_color = (230, 230, 230)

            #飞船的设置
            #self.ship_speed_factor = 1.5
            self.ship_limit = 3

            #子弹设置
            #self.bullet_speed_factor = 3
            self.bullet_width = 3
            self.bullet_height = 15
            self.bullet_color = 60,60,60
            self.bullets_allowed = 3

            #外星人设置
            #self.alien_speed_factor = 1
            self.fleet_drop_speed = 10
            #fleet_direction为1向右移为-1向左移
            #self.fleet_direction = 1

            #以什么样的速度加快游戏节奏
            self.speedup_scale = 1.1
            #外星人点数的提高速度
            self.score_scale = 1.5

            self.initialize_dynamic_settings()


      def initialize_dynamic_settings(self):
            '''初始化随游戏进行而变化的设置'''
            self.ship_speed_factor = 1.5
            self.bullet_speed_factor = 3
            self.alien_speed_factor = 1

            #得分
            self.alien_points = 50

            #fleet_direction为1表示向右；为-1表示向左
            self.fleet_direction = 1


      def increase_speed(self):
            '''提高速度设置和外星人点数'''
            self.ship_speed_factor *= self.speedup_scale
            self.bullet_speed_factor *= self.speedup_scale
            self.alien_speed_factor *= self.speedup_scale

            self.alien_points = int(self.alien_points * self.score_scale)
            #print(self.alien_points)

飞船类

文件名：ship.py

# ship类（飞船）
import pygame as ga
from pygame.sprite import Sprite

class Ship(Sprite):
      def __init__(self,ai_settings,screen):
            '''初始化飞船并设置其初始位置'''
            super(Ship, self).__init__()
            self.screen = screen
            self.ai_settings = ai_settings

            #加载飞船图像并获取其外部矩形
            self.image = ga.image.load('images/ship.bmp')
            self.rect  = self.image.get_rect()
            self.screen_rect = screen.get_rect()

            #将每艘飞船放在屏幕底部中央
            self.rect.centerx = self.screen_rect.centerx
            self.rect.bottom  = self.screen_rect.bottom

            #在飞船的属性center中存储小数值
            self.center = float(self.rect.centerx)

            #移动标志
            self.moving_right = False
            self.moving_left  = False

      def update(self):
            '''根据移动标志调整飞船的位置'''
            #重新飞船的center值而不是rect
            if self.moving_right and self.rect.right < self.screen_rect.right:
                  self.center += self.ai_settings.ship_speed_factor
            if self.moving_left and self.rect.left > 0:
                  self.center -= self.ai_settings.ship_speed_factor

            #根据self.conter更新rect对象
            self.rect.centerx = self.center
            

      def blitme(self):
            '''在指定位置绘制飞船'''
            self.screen.blit(self.image, self.rect)

      def center_ship(self):
            '''让飞船在屏幕中间'''
            self.center = self.screen_rect.centerx

图片

图片放在文件夹images中

就这么多啦，有问题请留言或私聊！