public override void Update(DrawerController drawer)
        {
            //调整位置和粒子的颜色
            position.y += bouyancy * Time.deltaTime;

            //判断粒子当前的“年龄”,毕竟各个阶段的火焰颜色不同嘛
            float t = (Time.time - startTime) / lifeTime;

            //根据他的年龄,给他上色
            color = Color.Lerp(MakeFireInInspector.instance.fireStartColor, MakeFireInInspector.instance.fireEndColor, t);
            if (t > 1)
            {
                DieClear();     //大限已到,节哀
            }
            //时不时生一个活的火焰
            if (UnityEngine.Random.Range(0, 100) < 10)
            {
                pos.Set(x, y - 1);
                drawer.CreateLivePixel <Fire>(pos, brush).startTime = startTime - .3f;
            }

            //如果碰到了木头,那就把他烧成灰烬人(生点余烬粒子),还有足够时间的着火才有几率点燃噢
            Color c = drawer.GetPixel(x, y, false);

            if (MakeFireInInspector.instance.IsFlammable(c) && UnityEngine.Random.Range(0, 100) < 2)
            {
                pos.Set(x, y);
                drawer.CreateLivePixel <Ember>(pos, attach);
            }

            //如果碰到雪了。。
            if (c.IsGrayscale())
            {
                drawer.SetPixel(x, y, Color.clear);
            }

            //碰到雨了
            if (c.IsBluescale())
            {
                drawer.SetPixel(x, y, Color.clear);
            }
        }
        float dieTime;      //啥时候死掉

        public override void Start(DrawerController drawer)
        {
            //初始化
            dieTime = Time.time + UnityEngine.Random.Range(.1f, 2f);

            color.r = 1f;
            color.g = UnityEngine.Random.Range(0f, .5f);
            color.b = 0;
            drawer.SetPixel(x, y, Color.black);
            nextFireTime = Time.time + UnityEngine.Random.Range(0, .4f);
        }
 public override void Update(DrawerController drawer)
 {
     //已经到了下次着火时间
     if (Time.time > nextFireTime)
     {
         Fire.CreateFlameAt(drawer, position + UnityEngine.Random.insideUnitCircle * 2f);
         nextFireTime += .4f;
     }
     //大限已到
     if (Time.time > dieTime)
     {
         drawer.SetPixel(x, y, Color.clear);   //木头已经被成灰烬人了。。
         DieClear();
     }
 }