/// <summary>
/// 百叶窗过渡
/// </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 Shutter(string spriteName, string direction = "left", float time = 0.5f)
{
Queue <NewImageEffect> effects = new Queue <NewImageEffect>();
effects.Enqueue(NewEffectBuilder.Shutter(spriteName, direction, time));
effects.Enqueue(NewEffectBuilder.SetSpriteByDepth(-1, spriteName));
return(new EffectPiece(id++, effects));
}