using System.IO;

using UnityEngine;

using UnityEditor;

using System.Linq;

public class SpriteToSplit  {

    /// <summary>

    /// 切割Sprite导出单个对象

    /// </summary>

    [MenuItem("Assets/Create/SpriteSplit2Export", false, )]

    public static void SpriteChildToExport()

    {

        for (int i = ; i < Selection.objects.Length; i++)

        {

            //获得选择对象路径;

            string spritePath = AssetDatabase.GetAssetPath(Selection.objects[i]);

            //所有子Sprite对象;

            Sprite[] sprites = AssetDatabase.LoadAllAssetsAtPath(spritePath).OfType<Sprite>().ToArray();

            if (sprites.Length < )

            {

                EditorUtility.DisplayDialog("错误", "当前选择文件不是Sprite!", "确认");

                Debug.LogError("Sorry,There is not find sprite!");

                return;

            }

            string[] splitSpritePath = spritePath.Split(new char[] { '/' });

            //文件夹路径 通过完整路径再去掉文件名称即可;

            string fullFolderPath = Inset(spritePath, , splitSpritePath[splitSpritePath.Length - ].Length + ) + "/" + Selection.objects[i].name;

            //同名文件夹;

            string folderName = Selection.objects[i].name;

            string adjFolderPath = InsetFromEnd(fullFolderPath, Selection.objects[i].name.Length + );

            //验证路径;

            if (!AssetDatabase.IsValidFolder(fullFolderPath))

            {

                AssetDatabase.CreateFolder(adjFolderPath, folderName);

            }

            for (int j = ; j < sprites.Length; j++)

            {   //进度条;

                string pgTitle = (i + ).ToString() + "/" + Selection.objects.Length + " 开始导出Sprite";

                string info = "当前Srpte: " + j + "->" + sprites[j].name;

                float nowProgress = (float)j / (float)sprites.Length;

                EditorUtility.DisplayProgressBar(pgTitle, info, nowProgress);

                //创建Texture;

                Sprite sprite = sprites[j];

                Texture2D tex = new Texture2D((int)sprite.rect.width, (int)sprite.rect.height, sprite.texture.format, false);

                tex.SetPixels(sprite.texture.GetPixels((int)sprite.rect.xMin, (int)sprite.rect.yMin,

                    (int)sprite.rect.width, (int)sprite.rect.height));

                tex.Apply();

                //判断保存路径;

                string savePath = fullFolderPath + "/" + sprites[j].name + ".png";

                //生成png;

                File.WriteAllBytes(savePath,tex.EncodeToPNG());

            }

            //释放进度条;

            EditorUtility.ClearProgressBar();

            //刷新资源，不然导出后你以为没导出，还要手动刷新才能看到;

            AssetDatabase.Refresh();

        }

    }

    /// <summary>

    /// 截取路径

    /// </summary>

    /// <param name="path"></param>

    /// <param name="leftIn">左起点</param>

    /// <param name="rightIn">右起点</param>

    /// <returns></returns>

    public static string Inset(string path, int leftIn, int rightIn)

    {

        return path.Substring(leftIn, path.Length - rightIn - leftIn);

    }

    /// <summary>

    /// 截取路径

    /// </summary>

    /// <param name="path"></param>

    /// <param name="inset"></param>

    /// <returns></returns>

    public static string InsetFromEnd(string path, int inset)

    {

        return path.Substring(, path.Length - inset);

    }

}