开始按钮鼠标响应完成。

Author: python0github

alien_invasion.py

@@ -31,15 +31,17 @@ def run_game():
 
     # 开始游戏的主循环
     while True:
-        gf.check_events(ai_settings, screen, stats, play_button, ship, bullets)
+        gf.check_events(ai_settings, screen, stats, play_button, ship,
+                aliens, bullets)
 
         if stats.game_active:
             ship.update()
             gf.update_bullets(ai_settings, screen, ship, aliens, bullets)
-            gf.update_aliens(ai_settings, stats, screen, ship, aliens, bullets)
+            gf.update_aliens(ai_settings, stats, screen, ship, aliens,
+                    bullets)
 
         gf.update_screen(ai_settings, screen, stats, ship, aliens, bullets,
                 play_button)
 
 
-run_game()
+run_game)

game_functions.py

@@ -35,7 +35,8 @@ def check_keyup_events(event, ship):
         ship.moving_left = False
 
 
-def check_events(ai_settings, screen, stats, play_button, ship, bullets):
+def check_events(ai_settings, screen, stats, play_button, ship, aliens,
+        bullets):
     """响应按键和鼠标事件"""
     for event in pygame.event.get():
         if event.type == pygame.QUIT:
@@ -47,16 +48,32 @@ def check_events(ai_settings, screen, stats, play_button, ship, bullets):
             check_keyup_events(event, ship)
         elif event.type == pygame.MOUSEBUTTONDOWN:
             mouse_x, mouse_y = pygame.mouse.get_pos()
-            check_play_button(stats, play_button, mouse_x, mouse_y)
+            check_play_button(ai_settings, screen, stats, play_button, ship,
+                    aliens, bullets, mouse_x, mouse_y)
 
 
-def check_play_button(stats, play_button, mouse_x, mouse_y):
+def check_play_button(ai_settings, screen, stats, play_button, ship,
+        aliens, bullets, mouse_x, mouse_y):
     """在玩家单击Play按钮时开始新游戏"""
-    if play_button.rect.collidepoint(mouse_x, mouse_y):
+    button_clicked =  play_button.rect.collidepoint(mouse_x, mouse_y)
+    if button_clicked and not stats.game_active:
+        # 隐藏光标
+        pygame.mouse.set_visible(False)
+        # 重置游戏统计信息
+        stats.reset_stats()
         stats.game_active = True
 
+        # 清空外星人列表和子弹列表
+        aliens.empty()
+        bullets.empty()
+
+        # 创建一群新的外星人，并让飞船居中
+        create_fleet(ai_settings, screen, ship, aliens)
+        ship.center_ship()
+
 
-def update_screen(ai_settings, screen, stats, ship, aliens, bullets, play_button):
+def update_screen(ai_settings, screen, stats, ship, aliens, bullets,
+        play_button):
     """更新屏幕上的图像，并切换到新屏幕"""
     # 每次循环时都重绘屏幕
     screen.fill(ai_settings.bg_color)
@@ -86,10 +103,12 @@ def update_bullets(ai_settings, screen, ship, aliens, bullets):
         if bullet.rect.bottom <= 0:
             bullets.remove(bullet)
 
-    check_bullet_alien_collisions(ai_settings, screen, ship, aliens, bullets)
+    check_bullet_alien_collisions(ai_settings, screen, ship, aliens,
+            bullets)
 
 
-def check_bullet_alien_collisions(ai_settings, screen, ship, aliens, bullets):
+def check_bullet_alien_collisions(ai_settings, screen, ship, aliens,
+        bullets ):
     """响应子弹和外星人的碰撞"""
     # 删除发生碰撞的子弹和外星人
     collisions = pygame.sprite.groupcollide(bullets, aliens, True, True)
@@ -136,7 +155,8 @@ def create_fleet(ai_settings, screen, ship, aliens):
     # 创建外星人群
     for row_number in range(number_rows):
         for alien_number in range(number_aliens_x):
-            create_alien(ai_settings, screen, aliens, alien_number, row_number)
+            create_alien(ai_settings, screen, aliens, alien_number,
+                    row_number)
 
 
 def check_fleet_edges(ai_settings, aliens):
@@ -173,6 +193,7 @@ def ship_hit(ai_settings, stats, screen, ship, aliens, bullets):
 
     else:
         stats.game_active = False
+        pygame.mouse.set_visible(True)
 
 
 def check_aliens_bottom(ai_settings, stats, screen, ship, aliens, bullets):