/// <summary>
/// 渐变背景
/// </summary>
/// <param name="spriteName">目标图片名</param>
/// <param name="transtime">转换时间</param>
public EffectPiece TransBackground(string spriteName, float transtime = 0.5f)
{
Queue <NewImageEffect> effects = new Queue <NewImageEffect>();
effects.Enqueue(NewEffectBuilder.PreTransBackSprite(spriteName));
effects.Enqueue(NewEffectBuilder.TransBackSprite(transtime));
return(new EffectPiece(id++, effects));
}
