C# 模仿微信生成九宫图头像

/// <summary>/// 算出图片坐标/// </summary>/// <param name="size">合成数量</param>/// <returns></returns>public static string[] GetXy(int size){    string[] s = new string[size];    int _x = 0;    int _y = 0;    switch (size)    {        case 1:          _x = _y = 6;          s[0] = "6,6";          break;        case 2:          _x = _y = 4;          s[0] = "4," + (132 / 2 - 60 / 2);          s[1] = 60 + 2 * _x + "," + (132 / 2 - 60 / 2);          break;        case 3:          _x = _y = 4;          s[0] = (132 / 2 - 60 / 2) + "," + _y;          s[1] = _x + "," + (60 + 2 * _y);          s[2] = (60 + 2 * _y) + "," + (60 + 2 * _y);          break;        case 4:          _x = _y = 4;          s[0] = _x + "," + _y;          s[1] = (_x * 2 + 60) + "," + _y;          s[2] = _x + "," + (60 + 2 * _y);          s[3] = (60 + 2 * _y) + "," + (60 + 2 * _y);          break;        case 5:          _x = _y = 3;          s[0] = (132 - 40 * 2 - _x) / 2 + "," + (132 - 40 * 2 - _y) / 2;          s[1] = ((132 - 40 * 2 - _x) / 2 + 40 + _x) + "," + (132 - 40 * 2 - _y) / 2;          s[2] = _x + "," + ((132 - 40 * 2 - _x) / 2 + 40 + _y);          s[3] = (_x * 2 + 40) + "," + ((132 - 40 * 2 - _x) / 2 + 40 + _y);          s[4] = (_x * 3 + 40 * 2) + "," + ((132 - 40 * 2 - _x) / 2 + 40 + _y);          break;        case 6:          _x = _y = 3;          s[0] = _x + "," + ((132 - 40 * 2 - _x) / 2);          s[1] = (_x * 2 + 40) + "," + ((132 - 40 * 2 - _x) / 2);          s[2] = (_x * 3 + 40 * 2) + "," + ((132 - 40 * 2 - _x) / 2);          s[3] = _x + "," + ((132 - 40 * 2 - _x) / 2 + 40 + _y);          s[4] = (_x * 2 + 40) + "," + ((132 - 40 * 2 - _x) / 2 + 40 + _y);          s[5] = (_x * 3 + 40 * 2) + "," + ((132 - 40 * 2 - _x) / 2 + 40 + _y);          break;        case 7:          _x = _y = 3;          s[0] = (132 - 40) / 2 + "," + _y;          s[1] = _x + "," + (_y * 2 + 40);          s[2] = (_x * 2 + 40) + "," + (_y * 2 + 40);          s[3] = (_x * 3 + 40 * 2) + "," + (_y * 2 + 40);          s[4] = _x + "," + (_y * 3 + 40 * 2);          s[5] = (_x * 2 + 40) + "," + (_y * 3 + 40 * 2);          s[6] = (_x * 3 + 40 * 2) + "," + (_y * 3 + 40 * 2);          break;        case 8:          _x = _y = 3;          s[0] = (132 - 80 - _x) / 2 + "," + _y;          s[1] = ((132 - 80 - _x) / 2 + _x + 40) + "," + _y;          s[2] = _x + "," + (_y * 2 + 40);          s[3] = (_x * 2 + 40) + "," + (_y * 2 + 40);          s[4] = (_x * 3 + 40 * 2) + "," + (_y * 2 + 40);          s[5] = _x + "," + (_y * 3 + 40 * 2);          s[6] = (_x * 2 + 40) + "," + (_y * 3 + 40 * 2);          s[7] = (_x * 3 + 40 * 2) + "," + (_y * 3 + 40 * 2);          break;        case 9:          _y = 3;          s[0] = _x + "," + _y;          s[1] = _x * 2 + 40 + "," + _y;          s[2] = _x * 3 + 40 * 2 + "," + _y;          s[3] = _x + "," + (_y * 2 + 40);          s[4] = (_x * 2 + 40) + "," + (_y * 2 + 40);          s[5] = (_x * 3 + 40 * 2) + "," + (_y * 2 + 40);          s[6] = _x + "," + (_y * 3 + 40 * 2);          s[7] = (_x * 2 + 40) + "," + (_y * 3 + 40 * 2);          s[8] = (_x * 3 + 40 * 2) + "," + (_y * 3 + 40 * 2);          break;     }     return s;}

/// <summary>/// 图片宽度/// </summary>/// <param name="size">合成数量</param>/// <returns></returns>public static float GetWidth(int size){    int width = 0;    if (size == 1)    {       width = 120;    }    if (size > 1 && size <= 4)    {       width = 60;    }    if (size >= 5)    {       width = 40;    }    return width;}

/// <summary>/// 把要合成的单张图片进行压缩/// </summary>/// <param name="bitmap">Bitmap</param>/// <param name="width">宽</param>/// <param name="height">高</param>/// <returns></returns>private Bitmap UserPir(Bitmap bitmap, int width, int height){   using (var bmp = new System.Drawing.Bitmap(width, height))   {      //从Bitmap创建一个System.Drawing.Graphics对象，用来绘制高质量的缩小图。        using (var gr = System.Drawing.Graphics.FromImage(bmp))      {          //设置 System.Drawing.Graphics对象的SmoothingMode属性为HighQuality            gr.SmoothingMode=System.Drawing.Drawing2D.SmoothingMode.HighQuality;          //下面这个也设成高质量            gr.CompositingQuality = System.Drawing.Drawing2D.CompositingQuality.HighQuality;          //下面这个设成High            gr.InterpolationMode = System.Drawing.Drawing2D.InterpolationMode.High;          //把原始图像绘制成上面所设置宽高的截取图            var rectDestination = new System.Drawing.Rectangle(0, 0, width, height);          gr.DrawImage(bitmap, 0, 0, rectDestination, System.Drawing.GraphicsUnit.Pixel);          //保存截取的图片            return bitmap;     }   }}

/// <summary>/// 合成头像/// </summary>/// <param name="imgPathList">图片路径集合</param>/// <param name="oldPath">原路径生成</param>/// <returns></returns>public string GroupPir(List<string> imgPathList, string oldPath = ""){  //绘制坐标  string[] arr = JiuGongDiagram.GetXy(imgPathList.Count);  //图片尺寸  var wh = JiuGongDiagram.GetWidth(imgPathList.Count);  using (Bitmap backgroudImg = new Bitmap(132, 132))  {    using (Graphics g = Graphics.FromImage(backgroudImg))    {       //设置 System.Drawing.Graphics对象的SmoothingMode属性为HighQuality         g.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.HighQuality;       //下面这个也设成高质量         g.CompositingQuality = System.Drawing.Drawing2D.CompositingQuality.HighQuality;       //下面这个设成High         g.InterpolationMode = System.Drawing.Drawing2D.InterpolationMode.High;       //清除画布,背景设置为灰色       g.Clear(System.Drawing.Color.Gainsboro);       var flag = 0;       MemoryStream ms;       imgPathList.ForEach(m =>       {         Bitmap bitmap;         if (string.IsNullOrEmpty(m))         {            bitmap = new Bitmap(HttpContext.Current.Server.MapPath(WebConfig.GroupUserPir));         }         else         {            byte[] bytes = DownloadUserPir($"{WebConfig.FtpViewPath}{m}");            if (bytes.Length > 0)            {               ms = new MemoryStream(bytes);               bitmap = new Bitmap(ms);               ms.Close();            }            else            {                bitmap = new Bitmap(HttpContext.Current.Server.MapPath(WebConfig.GroupUserPir));            }        }        string[] xy = arr[flag].Split(',');        g.DrawImage(UserPir(bitmap, int.Parse(xy[0]), int.Parse(xy[1])), int.Parse(xy[0]),     int.Parse(xy[1]), wh, wh);        flag++;        });        g.Dispose();        ms = new MemoryStream();        backgroudImg.Save(ms, System.Drawing.Imaging.ImageFormat.Png);        if (string.IsNullOrEmpty(oldPath))        {            //文件保存目录路径             string dirPath = "/Group/GroupPir/" + DateTime.Now.ToString("yyyyMMdd", DateTimeFormatInfo.InvariantInfo);            //文件名称            string fileName = $"{Utils.GetGuid(false).ToLower()}.png";            //保存的文件路径            var savePath = dirPath + "/" + fileName;            return FTPUploadFiles.UploadMemoryStream(ms, dirPath, savePath);       }        return FTPUploadFiles.UploadMemoryStream(ms, oldPath) ? oldPath : string.Empty;      }   }}

/// <summary>/// 下载图片/// </summary>/// <param name="path">路径</param>/// <returns></returns>private byte[] DownloadUserPir(string path){   byte[] bt;   try   {      using (WebClient webClient = new WebClient())      {           bt = webClient.DownloadData(path);      }   }   catch (Exception e)   {       bt = new byte[0];   }   return bt;}