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alien.py

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+import sys
+import pygame
+from settings import Settings
+from ship import Ship
+import game_functions as gf
+
+def run_game():
+    #初始化，创建屏幕对象
+    pygame.init()
+    ai_settings=Settings()
+    screen = pygame.display.set_mode((ai_settings.screen_width,ai_settings.screen_height))
+    pygame.display.set_caption("Alien")
+    ship=Ship(ai_settings,screen)
+
+    #开始游戏循环
+    while True:
+        #监视键盘、鼠标事件
+        gf.check_events(ship)
+        ship.update()
+        gf.update_screen(ai_settings,screen,ship)
+
+
+run_game()

game_functions.py

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+import sys
+import pygame
+
+def check_keydown_events(event,ship):
+    """响应按键"""
+    if event.key == pygame.K_RIGHT:
+        ship.moving_right = True
+    elif event.key == pygame.K_LEFT:
+        ship.moving_left = True
+def check_keyup_events(event,ship):
+    """响应松开"""
+    if event.key == pygame.K_RIGHT:
+        ship.moving_right = False
+    elif event.key == pygame.K_LEFT:
+        ship.moving_left = False
+
+def check_events(ship):
+    """响应按键、鼠标事件"""
+    for event in pygame.event.get():
+        if event.type==pygame.QUIT:
+            sys.exit()
+        elif event.type==pygame.KEYDOWN:
+            check_keydown_events(event,ship)
+
+        elif event.type==pygame.KEYUP:
+            check_keyup_events(event,ship)
+
+def update_screen(ai_settings,screen,ship):
+    """update images,change into new screen"""
+
+    screen.fill(ai_settings.bg_color)
+    ship.blitme()
+
+    pygame.display.flip()

settings.py

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+class Settings():
+    """store all the settings"""
+
+    def __init__(self):
+
+        #screen
+        self.screen_width=1200
+        self.screen_height=800
+        self.bg_color=(230,230,230)
+
+        #set ship
+        self.ship_speed_factor=1.5
+
+        #bullet
+        self.bullet_speed_factor=1
+        self.bullet_width=3
+        self.bullet_height=15
+        self.bullet_color=60,60,60

ship.py

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+import pygame
+class Ship():
+    def __init__(self,ai_settings,screen):
+        """initialize ship and position"""
+        self.screen=screen
+        self.ai_settings=ai_settings
+
+        #load image and get 外接矩形
+        self.image=pygame.image.load(r'E:/Game/images/ship.bmp')
+        self.rect=self.image.get_rect()
+        self.screen_rect=screen.get_rect()
+
+        #put ship in the center
+        self.rect.centerx=self.screen_rect.centerx
+        self.rect.bottom=self.screen_rect.bottom
+
+        #存储速度
+        self.center=float(self.rect.centerx)
+
+        #move sign
+        self.moving_right=False
+        self.moving_left = False
+
+    def update(self):
+        """根据标志调整飞船位置"""
+        #更新center，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
+        #更新rect对象
+        self.rect.centerx=self.center
+
+
+    def blitme(self):
+        """draw ship"""
+        self.screen.blit(self.image,self.rect)