11.生命系统

玩家爆炸
单击此处下载这些图像的 zip。
explosion_anim 字典，添加 ‘player’ 键，加载sonicExplosion 00-08图片

explosion_anim = {}
explosion_anim['lg'] = []
explosion_anim['sm'] = []
explosion_anim['player'] = []
for i in range(9):
    filename = 'regularExplosion0{}.png'.format(i)
    img = pygame.image.load(path.join(img_dir, filename)).convert()
    img.set_colorkey(BLACK)
    img_lg = pygame.transform.scale(img, (75, 75))
    explosion_anim['lg'].append(img_lg)
    img_sm = pygame.transform.scale(img, (32, 32))
    explosion_anim['sm'].append(img_sm)
    filename = 'sonicExplosion0{}.png'.format(i)
    img = pygame.image.load(path.join(img_dir, filename)).convert()
    img.set_colorkey(BLACK)
    explosion_anim['player'].append(img)

玩家碰到陨石处，玩家护盾 shield<=0 时，显示玩家爆炸动画

# 检查是否有陨石击中了玩家
    hits = pygame.sprite.spritecollide(player, mobs, True, pygame.sprite.collide_circle)
    for hit in hits:
        player.shield -= 10
        expl = Explosion(hit.rect.center, 'lg')
        all_sprites.add(expl)
        newmob()
        if player.shield <= 0:
            death_explosion = Explosion(player.rect.center, 'player')
            all_sprites.add(death_explosion)
            running = False

玩家爆炸动画没显示玩，游戏就退出了
设置代码：

    if player.shield <= 0:
        death_explosion = Explosion(player.rect.center, 'player')
        all_sprites.add(death_explosion)
	player.kill()

# 如果玩家死亡 并且 爆炸动画 播放完毕。
if not player.alive() and not death_explosion.alive():
	running = False

添加玩家生命：
玩家多条名，剩余几条命显示几个小飞机
加载小飞机图像

player_img = pygame.image.load(path.join(img_dir, "playerShip1_orange.png")).convert()
player_mini_img = pygame.transform.scale(player_img, (25, 19))
player_mini_img.set_colorkey(BLACK)

Player 类，添加几个属性：
lives 生命数
hidden 隐藏/显示玩家的标志
hide_timer 隐藏时间戳

self.lives = 3
self.hidden = False
self.hide_timer = pygame.time.get_ticks()

玩家碰撞代码，当玩家死亡时，减少生命 live -1 ，替换原来的 player.kill()
shield 护盾重置为100

if player.shield <= 0:
            death_explosion = Explosion(player.rect.center, 'player')
            all_sprites.add(death_explosion)
            player.hide()
            player.lives -= 1
            player.shield = 100
    # 如果玩家死亡 并且 爆炸动画播放完毕。
    if player.lives==0 and not death_explosion.alive():
        running = False

Player 类添加 hide() 方法处理玩家隐藏

def hide(self):
        # 临时隐藏
        self.hidden = True
        self.hide_timer = pygame.time.get_ticks()
        self.rect.center = (WIDTH / 2, HEIGHT + 200)

Player 类， update() 方法，添加代码一定时间后再次显示

    def update(self):
        # 再次显示
        if self.hidden and pygame.time.get_ticks() - self.hide_timer > 1000:
            self.hidden = False
            self.rect.centerx = WIDTH / 2
            self.rect.bottom = HEIGHT - 10

显示生命数据
添加函数 draw_lives() 处理生命图像显示数据

def draw_lives(surf, x, y, lives, img):
    for i in range(lives):
        img_rect = img.get_rect()
        img_rect.x = x + 30 * i
        img_rect.y = y
        surf.blit(img, img_rect)

主循环绘制生命数据

draw_lives(screen, WIDTH - 100, 5, player.lives, player_mini_img)

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11.生命系统

11.生命系统

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