9.添加护盾

添加护盾
Player类，添加护盾属性shield =100，

class Player(pygame.sprite.Sprite):
    def __init__(self):
        self.speedx = 0
        self.shield = 100

对玩家造成伤害
修改碰撞检测代码，每次被陨石击中shield -1

 # 检查是否有敌人击中了玩家
    hits = pygame.sprite.spritecollide(player, mobs, True, pygame.sprite.collide_circle)
    for hit in hits:
        player.shield -= 10
        if player.shield <= 0:
            running = False

陨石碰到子弹，陨石碰到玩家都会消失，为了保证陨石总数不变，陨石消失时都需要生成新的陨石，新建一个陨石生成函数 newmob（）

def newmob():
    m = Mob()
    all_sprites.add(m)
    mobs.add(m)

陨石碰到子弹，陨石碰到玩家消失后，调用 newmob（）生成新陨石

    # 检查是否有敌人击中了玩家
    hits = pygame.sprite.spritecollide(player, mobs, False, pygame.sprite.collide_circle)
    for hit in hits:
        player.shield -= 10
        newmob()
        if player.shield <= 0:
            running = False

    # 检查子弹是否击中了敌人
    hits = pygame.sprite.groupcollide(mobs, bullets, True, True)
    for hit in hits:
        score += 10
        random.choice(expl_sounds).play()
        newmob()

护盾进度条
生成护盾进度条函数 draw_shield_bar()

def draw_shield_bar(surf, x, y, pct):
    if pct < 0:
        pct = 0
    BAR_LENGTH = 100
    BAR_HEIGHT = 10
    fill = (pct / 100) * BAR_LENGTH
    outline_rect = pygame.Rect(x, y, BAR_LENGTH, BAR_HEIGHT)
    fill_rect = pygame.Rect(x, y, fill, BAR_HEIGHT)
    pygame.draw.rect(surf, GREEN, fill_rect)
    pygame.draw.rect(surf, WHITE, outline_rect, 2)

添加护盾进度条

draw_text(screen, str(score), 18, WIDTH / 2, 10)
draw_shield_bar(screen, 5, 5, player.shield)

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9.添加护盾

9.添加护盾

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