using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using System.Drawing.Imaging;
using Aspose.Cells;
using Aspose.Cells.Rendering;
using System.IO;
using UnityEngine.UI;

/// <summary>
/// 加载excel并转为图片
/// </summary>
public class LoadExcelTest : MonoBehaviour
{
    public static LoadExcelTest Instance;

    public GameObject imageprefab;
    public Transform content;

    private void Start()
    {
        Instance = this;
    }

    /// <summary>
    /// 加载excel
    /// </summary>
    public void LoadExcelGO(string path)
    {
        //清理content下的旧物体
        for (int i = 0; i < content.childCount; i++)
        {
            Destroy(content.GetChild(i).gameObject);
        }

        //查找整个文档
        Workbook book = new Workbook(path);
        //获取一个工作表
        Worksheet sheet = book.Worksheets[0];

        //设置边距
        sheet.PageSetup.LeftMargin = 0;
        sheet.PageSetup.RightMargin = 0;
        sheet.PageSetup.BottomMargin = 0;
        sheet.PageSetup.TopMargin = 0;

        //设置图片的打印格式
        ImageOrPrintOptions imageOptions = new ImageOrPrintOptions();
        imageOptions.ImageFormat = ImageFormat.Jpeg;
        imageOptions.OnePagePerSheet = true;
        imageOptions.PrintingPage = PrintingPageType.IgnoreBlank;

        //excel转图片的转换器对象
        SheetRender sr = new SheetRender(sheet, imageOptions);

        //声明内存流，将图片转换为内存流，再由流转换为byte数组，然后用texture2d加载byte数组
        using (MemoryStream ms = new MemoryStream())
        {
            sr.ToImage(0, ms);
            byte[] buff = new byte[ms.Length];
            ms.Seek(0, SeekOrigin.Begin);
            ms.Read(buff, 0, (int)ms.Length);

            //注意这个iamge的命名空间为system.drawing不是unity.ui,这个图片的目的是提供图片的宽高
            System.Drawing.Image sizeImage = System.Drawing.Image.FromStream(ms);

            Texture2D texture2D = new Texture2D(sizeImage.Width, sizeImage.Height);
            texture2D.LoadImage(buff);

            Image image = Instantiate(imageprefab, content).GetComponent<Image>();
            //根据转化出来的图片的大小设置unity image的大小
            image.rectTransform.sizeDelta = new Vector2(sizeImage.Width, sizeImage.Height);
            //用texture2d为精灵赋值
            image.sprite = Sprite.Create(texture2D, new Rect(0, 0, texture2D.width, texture2D.height), Vector2.zero);
        }

    }

}