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settings.py

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+import pygame
+
+class Settings():
+    """储存《外星人入侵》所有设置的类"""
+
+    def __init__(self):
+        """初始化游戏的设置"""
+        # 屏幕设置
+        self.screen_width = 1200
+        self.screen_height = 800
+        self.bg_color = (0, 0, 0)
+        self.lb_bg_color = (10, 10, 10)
+        self.lb_text_color = (230, 230, 230)
+
+        # 飞船设置
+        self.ship_limit = 3
+
+        # 子弹设置
+        self.bullet_width = 3
+        self.bullet_height = 15
+        self.bullet_color = (180, 180, 180)
+        self.bullets_allowed = 5
+
+        # 超级子弹设置
+        self.super_bullet_color = (0, 255, 0)
+        self.super_bullet_width = 6
+        self.super_bullet_height = 150
+        self.points_of_power = 1000
+
+        # 外星人设置
+        self.fleet_drop_speed = 10
+        self.alien_bullet_color = (220, 220, 0)
+
+        # 游戏加快节奏参数
+        self.speedup_scale = 1.1
+
+        # 击中外星人得分点数的提高速度
+        self.score_scale = 1.2
+
+        # 音效设置
+        self.bullet_sound = pygame.mixer.Sound("sounds/bullet.wav")
+        self.super_bullet_sound = pygame.mixer.Sound("sounds/super_bullet.wav")
+        self.ship_hit_sound = pygame.mixer.Sound("sounds/ship_hit.wav")
+        self.start_new_level_sound = pygame.mixer.Sound("sounds/start_new_level.wav")
+        self.super_mode_sound = pygame.mixer.Sound("sounds/super_mode.wav")
+        self.gameover_sound = pygame.mixer.Sound("sounds/gameover.wav")
+        self.recordbroken_sound = pygame.mixer.Sound("sounds/recordbroken.wav")
+
+        # 初始化游戏动态设置
+        self.initialize_dynamic_settings()
+
+
+    def initialize_dynamic_settings(self):
+        """初始化动态参数"""
+        self.ship_speed_factor = 1.5
+        self.bullet_speed_factor = 3
+        self.alien_speed_factor = 1
+        self.super_bullet_speed_factor = 30
+
+        # 1表示右移，-1表示左移
+        self.fleet_direction = 1
+
+        # 记分
+        self.alien_points = 50
+
+
+    def increase_speed(self):
+        """提高速度设置"""
+        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)

ship.py

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+import pygame
+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().__init__()
+        self.ai_settings = ai_settings
+        self.screen = screen
+
+        # 加载飞船图像并获得其外接矩形
+        self.image = pygame.image.load('images/ship.bmp')
+        self.rect = self.image.get_rect()
+        self.screen_rect = screen.get_rect()
+
+        # 将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中储存小数值
+        self.center = float(self.rect.centerx)
+
+        # 移动标志
+        self.moving_right = False
+        self.moving_left = False
+
+        # 无敌标志
+        self.super_mode = False
+
+    def update(self):
+        """根据移动标志调整飞船位置"""
+        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 > self.screen_rect.left:
+            self.center -= self.ai_settings.ship_speed_factor
+
+        self.rect.centerx = self.center
+
+
+    def blitme(self):
+        """在指定位置绘制飞船"""
+        self.screen.blit(self.image, self.rect)
+
+        if self.super_mode:
+            # 无敌模式，绘制金色边框
+            pygame.draw.rect(self.screen, (200, 200, 0),(self.rect), 2)
+
+    def center_ship(self):
+        self.rect.centerx = self.screen_rect.centerx