存储项目的大部分函数

game_functions.py

@@ -3,6 +3,8 @@ import pygame
 from bullet import *
 from alien import *
 from time import sleep
+
+
 def check_keydown_events(event, ai_settings, screen, ship, bullets):
     """响应按键"""
     if event.key == pygame.K_RIGHT:
@@ -17,6 +19,8 @@ def check_keydown_events(event, ai_settings, screen, ship, bullets):
         fire_bullet(ai_settings, screen, ship, bullets)
     elif event.key == pygame.K_q:
         sys.exit()
+
+
 def fire_bullet(ai_settings, screen, ship, bullets):
     """如果还没有到达限制，就发射一颗子弹"""
     # 创建一颗子弹，并将其加入到编组bullets中
@@ -27,15 +31,21 @@ def fire_bullet(ai_settings, screen, ship, bullets):
         pygame.mixer.init()
         sound = pygame.mixer.Sound('sounds/firebullets.wav')
         sound.play()
+
+
 def bossalien_fire_bullet(ai_settings, screen, bossalien, bossbullet, ship):
     """增加：BOSS发射子弹"""
     # 创建一颗子弹
     bossbullet = BossBullet(ai_settings, screen, bossalien)
+
+
 def check_bossbullet_bottom(ai_settings, screen, stats, sb, ship, aliens, bossalien, bullets, bossbullet):
     """当子弹飞出屏幕底部时，重置BOSS子弹位置"""
     screen_rect = screen.get_rect()
     if bossbullet.y >= screen_rect.bottom:
         bossbullet.reset_position(bossalien)
+
+
 def check_keyup_events(event, ship):
     """响应松开"""
     if event.key == pygame.K_RIGHT:
@@ -46,6 +56,8 @@ def check_keyup_events(event, ship):
         ship.moving_up = False
     elif event.key == pygame.K_DOWN:
         ship.moving_down = False
+
+
 def check_events(ai_settings, screen, stats, sb, play_button, ship, aliens, bullets):
     """响应按键和鼠标事件"""
     for event in pygame.event.get():
@@ -59,6 +71,8 @@ def check_events(ai_settings, screen, stats, sb, play_button, ship, aliens, bull
             mouse_x, mouse_y = pygame.mouse.get_pos()
 
             check_play_button(ai_settings, screen, stats, sb, play_button, ship, aliens, bullets, mouse_x, mouse_y)
+
+
 def update_screen(ai_settings, screen, stats, sb, ship, aliens, bossalien, bullets, bossbullet, play_button):
     screen.fill(ai_settings.bg_color)
     ship.blitme()
@@ -88,6 +102,8 @@ def update_screen(ai_settings, screen, stats, sb, ship, aliens, bossalien, bulle
 
     # 让最近绘制的屏幕可见
     pygame.display.flip()
+
+
 def update_bullets(ai_settings, screen, stats, sb, ship, aliens, bullets, bossalien, bossbullet):
     """更新子弹的位置，并删除已消失的子弹"""
     # 更新子弹的位置
@@ -102,6 +118,8 @@ def update_bullets(ai_settings, screen, stats, sb, ship, aliens, bullets, bossal
             bullets.remove(bullet)
 
     check_bullet_collisions(ai_settings, screen, stats, sb, ship, aliens, bossalien, bullets, bossbullet)
+
+
 def check_bullet_collisions(ai_settings, screen, stats, sb, ship, aliens, bossalien, bullets, bossbullet):
     """响应子弹和外星人的碰撞，以及外星人子弹和船的碰撞"""
     # 增加：只有在非BOSS关才启用
@@ -159,6 +177,8 @@ def check_bullet_collisions(ai_settings, screen, stats, sb, ship, aliens, bossal
 
         if pygame.Rect.colliderect(bossbullet.rect, ship.rect):
             ship_hit(ai_settings, screen, stats, sb, ship, aliens, bullets, bossalien, bossbullet)
+
+
 def create_fleet(ai_settings, screen, ship, aliens):
     """创建外星人群"""
     # 创建一个外星人，并计算一行可容纳多少个外星人
@@ -176,4 +196,21 @@ def get_number_aliens_x(ai_settings, alien_width):
     """计算每行可容纳多少个外星人"""
     available_space_x = ai_settings.screen_width - 2 * alien_width
     number_aliens_x = int(available_space_x / (2 * alien_width))
-    return number_aliens_x
+    return number_aliens_x
+
+
+def create_alien(ai_settings, screen, aliens, alien_number, row_number):
+    """创建一个外星人并将其放在当前行"""
+    alien = Alien(ai_settings, screen)
+    alien_width = alien.rect.width
+    alien.x = alien_width + 2 * alien_width * alien_number
+    alien.rect.x = alien.x
+    alien.rect.y = alien.rect.height + 2 * alien.rect.height * row_number
+    aliens.add(alien)
+
+
+def get_number_rows(ai_settings, ship_height, alien_height):
+    """计算屏幕可容纳多少行外星人"""
+    available_space_y = (ai_settings.screen_height - (3 * alien_height) - ship_height)
+    number_rows = int(available_space_y / (2 * alien_height))
+    return number_rows