更新 'Alien_Invasion.py'

Alien_Invasion.py

@@ -74,11 +74,10 @@ class AlienInvasion:
         alien.rect.y = alien.rect.height + 2 * alien.rect.height * row_number
         self.aliens.add(alien)
 
-        def run_game(self):
+    def run_game(self):
         """开始游戏的主循环"""
         while True:
             self._check_events()
-            self.ship.update()
 
             if self.stats.game_active:
                 self.ship.update()
@@ -86,7 +85,6 @@ class AlienInvasion:
                 self._update_aliens()
                 
             self._update_screen()
-            # 监视键盘和鼠标事件
 
     def _update_aliens(self):
         """
@@ -167,7 +165,6 @@ class AlienInvasion:
             self.aliens.empty()
             self.bullets.empty()
 
-    elif event.type == pygame.KEYDOWN:
             # 创建一群新的外星人并让飞船居中
             self._create_fleet()
             self.ship.center_ship()
@@ -179,7 +176,6 @@ class AlienInvasion:
         """响应按键"""
         if event.key == pygame.K_RIGHT:
             self.ship.moving_right = True
-    elif event.key == pygame.K_LEFT:
         elif event.key == pygame.K_LEFT:
             self.ship.moving_left = True
         elif event.key == pygame.K_q:
@@ -187,14 +183,11 @@ class AlienInvasion:
         elif event.key == pygame.K_SPACE:
             self._fire_bullet()
 
-    elif event.type == pygame.KEYUP:
     def _check_keyup_events(self,event):
         """响应松开"""
         if event.key == pygame.K_RIGHT:
-    self.ship.moving_right = False
             self.ship.moving_right = False
         elif event.key == pygame.K_LEFT:
-        self.ship.moving_left = False
             self.ship.moving_left = False
 
     def _fire_bullet(self):
@@ -203,25 +196,67 @@ class AlienInvasion:
             new_bullet = Bullet(self)
             self.bullets.add(new_bullet)
 
-    elif event.type == pygame.KEYDOWN:
-        if event.key == pygame.K_RIGHT:
-            self.ship.moving_right = True
-    elif event.key == pygame.K_LEFT:
-            self.ship.moving_left = True
-
-    elif event.type == pygame.KEYUP:
-        if event.key == pygame.K_RIGHT:
-    self.ship.moving_right = False
-        elif event.key == pygame.K_LEFT:
-        self.ship.moving_left = False
-
     def _update_screen(self):
-        self.screen.fill(self.settings.bg_color) # 每次循环时都重绘屏幕
+        """更新屏幕上的图像，并切换到新屏幕"""
+        self.screen.fill(self.settings.bg_color)
         self.ship.blitme()
+        for bullet in self.bullets.sprites():
+            bullet.draw_bullet()
+        self.aliens.draw(self.screen)
+
+        # 显示得分
+        self.sb.show_score()
+
+        # 如果游戏处于非活动状态，就绘制Play按钮
+        if not self.stats.game_active:
+            self.play_button.draw_button()
 
-        # 让最近绘制的屏幕可见
         pygame.display.flip()
 
-if __name__ == '__main__':     # 创建游戏实例并运行游戏
+    def _check_fleet_edges(self):
+        """有外星人到达边缘时采取相应的措施"""
+        for alien in self.aliens.sprites():
+            if alien.check_edges():
+                self._change_fleet_direction()
+                break
+
+    def _change_fleet_direction(self):
+        """将整个外星人下移，并改变它们的方向"""
+        for alien in self.aliens.sprites():
+            alien.rect.y += self.settings.fleet_drop_speed
+        self.settings.fleet_direction *= -1
+
+    def _ship_hit(self):
+        """响应飞船被外星人撞到"""
+        if self.stats.ships_left > 0:
+            # 将ships_left减一并更新记分牌
+            self.stats.ships_left -= 1
+            self.sb.prep_ships()
+
+            # 清空余下的外星人和子弹
+            self.aliens.empty()
+            self.bullets.empty()
+
+            # 创建一群新的外星人，并将飞船放到屏幕底端的中央
+            self._create_fleet()
+            self.ship.center_ship()
+
+            # 暂停
+            sleep(0.5)
+        else:
+            self.stats.game_active = False
+            pygame.mouse.set_visible(True)
+
+    def _check_aliens_bottom(self):
+        """检查是否有外星人到达了屏幕底端"""
+        screen_rect = self.screen.get_rect()
+        for alien in self.aliens.sprites():
+            if alien.rect.bottom >= screen_rect.bottom:
+                # 像飞船被撞到一样处理
+                self._ship_hit()
+                break
+
+if __name__ == '__main__':
+    # 创建游戏实例并运行游戏
     ai = AlienInvasion()
     ai.run_game()