def food_update(snack, ai_settings, screen, foods):
'''更新食物'''
if len(foods) == 0:
#记录是否发生碰撞
is_collide = False
#构造新食物
new_food = Food(screen, ai_settings)
test_rect = new_food.rect.copy()
while True:
#构造随机位置
test_rect.centerx = random.randint(
ai_settings.food_side,
ai_settings.win_width - ai_settings.food_side)
test_rect.centery = random.randint(
ai_settings.food_side,
ai_settings.win_height - ai_settings.food_side)
#检查碰撞
for snk in snack.snack_list:
if pygame.Rect.colliderect(test_rect, snk.rect):
is_collide = True
break
if is_collide == False:
new_food.rect = test_rect
foods.append(new_food)
new_food.blit_food()
break
else:
is_collide = False
else:
for fd in foods:
fd.blit_food()
