游戏相应按键

game_functions.py

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+# 《外星人入侵》运行的所有函数
+
+import sys
+import pygame
+
+from bullet import Bullet
+from alien import Alien
+from time import sleep
+import json
+import music
+
+
+def play_bg_music():
+    """背景音乐"""
+    if not pygame.mixer.music.get_busy():
+        pygame.mixer.music.play()
+
+
+def check_keydown_events(event, ai_settings, screen, ship, bullets, game_stats, scoreb, aliens):
+    """"
+        响应鼠标按下操作
+    """
+    # 按右箭头飞船向右移动
+    if event.key == pygame.K_RIGHT:
+        ship.moving_right = True
+    # 按左箭头飞船向左移动
+    elif event.key == pygame.K_LEFT:
+        ship.moving_left = True
+
+    # 按空格键创建一颗子弹并将其加入到编组bullets中
+    elif event.key == pygame.K_SPACE:
+        fire_bullet(ai_settings, screen, ship, bullets)
+
+    # 按p开始游戏
+    elif event.key == pygame.K_p:
+        start_game(ai_settings, screen, ship, bullets, game_stats, scoreb,
+                   aliens)
+
+    # 按z暂停游戏3s
+    elif event.key == pygame.K_z:
+        sleep(2)
+
+    # 按q退出游戏并把最高分写入文件
+    elif event.key == pygame.K_q:
+        with open('Max_score.json', 'w', encoding='UTF-8') as file:
+            json.dump(game_stats.high_score, file)
+        sys.exit()
+
+