/// <summary>
/// 蒙版特效
/// </summary>
/// <param name="spriteName">新图</param>
/// <param name="direction">方向（默认：左）</param>
/// <param name="time">持续时长s（默认0.5s）</param>
public EffectPiece Mask(string spriteName, string maskName, float time = 1.0f)
{
Queue <NewImageEffect> effects = new Queue <NewImageEffect>();
effects.Enqueue(NewEffectBuilder.Mask(spriteName, maskName, time));
effects.Enqueue(NewEffectBuilder.SetBackSprite(spriteName));
return(new EffectPiece(id++, effects));
}