js插件Jcrop自定义截取图片功能

//剪裁头像对象和宽高比例
var jcrop_api, boundx, boundy;
//上传图片 
//Id：上传控件Id
//IsShowProgress:是否需要展示进度条
//SuccessFunc: 上传成功执行的方法
function UploadImg(Id, IsShowProgress, SuccessFunc,IsJcrop) {
 var uploadObj = $("#" + Id);
 var htmlstr = "<div class='upload_ShowFileProgress' id='" + Id + "-queue' " + (IsShowProgress ? "" : "style='display:none;'") + "></div>";
 uploadObj.parent().append(htmlstr);
 var img_UploadUrl = IsJcrop ? "/Upload/UploadifyHeader" : "/Upload/UploadifyImg"; //Upload控制器中方法
 uploadObj.uploadify({
  //指定swf文件
  'swf': '/Scripts/uploadify/uploadify.swf',//下载uploadify插件中的uploadify.swf
  //后台处理的页面
  'uploader': img_UploadUrl,
  //进度条id
  'queueID': Id + "-queue",
  //进度条显示完成后是否自动消失
  'removeCompleted': false,
  //按钮相关
  'buttonClass': 'btn_Upload',
  'buttonText': '请选择图片',
  'height': '31',
  'width': '108',
  //在浏览窗口底部的文件类型下拉菜单中显示的文本
  'fileTypeDesc': 'Image Files',
  //允许上传的文件后缀
  'fileTypeExts': '*.gif; *.jpg; *.png; *.bmp; *.jpeg; *.svg',
  //选择文件后自动上传
  'auto': true,
  //设置为true将允许多文件上传
  'multi': false,
  'onUploadSuccess': function (file, data, response) {
   if (SuccessFunc != undefined && SuccessFunc != null && SuccessFunc.length > 0) {
    eval(SuccessFunc + "(file,data,response)");
   }
  }
 });
}
//上传文件
//Id：上传控件Id
//IsShowProgress:是否需要展示进度条
//SuccessFunc: 上传成功执行的方法
function UploadFile(Id, IsShowProgress, SuccessFunc) {
 var uploadObj = $("#" + Id);
 var htmlstr = "<div class='upload_ShowFileProgress' id='" + Id + "-queue' " + (IsShowProgress ? "" : "style='display:none;'") + "></div>";
 uploadObj.parent().append(htmlstr);
 uploadObj.uploadify({
  //指定swf文件
  'swf': '/Scripts/uploadify/uploadify.swf',
  //后台处理的页面
  'uploader': '/Upload/Uploadify',
  //进度条id
  'queueID': Id + "-queue",
  //进度条显示完成后是否自动消失
  'removeCompleted': false,
  //按钮相关
  'buttonClass': 'btn_Upload',
  'buttonText': '请选择文件',
  'height': '31',
  'width': '108',
  //上传文件的类型 默认为所有文件
  'All Files': '*.*',
  //在浏览窗口底部的文件类型下拉菜单中显示的文本
  //'fileTypeDesc': 'Image Files',
  //允许上传的文件后缀
  'fileTypeExts': '*.*',
  //选择文件后自动上传
  'auto': false,
  //设置为true将允许多文件上传
  'multi': true,
  'onUploadSuccess': function (file, data, response) {
   if (SuccessFunc != undefined && SuccessFunc != null && SuccessFunc.length > 0) {
    eval(SuccessFunc + "(file,data,response)");
   }
  }
 });
}
//设定图片
function SetJcropImage(url) {
 $(".div_NoFileTip").hide();
 $(".UploadImgContainer").show();
 $("#preview_large").attr("src", url);
 $("#preview_large2").attr("src", url);
 $("#preview_large3").attr("src", url);
 $("#imgsrc").val(url);
 ErealizeJcrop(url);
}
//剪切图片
function ErealizeJcrop(url) {
 var $pcnt = $('#preview_large2').parent(),
  xsize = $pcnt.width(),
  ysize = $pcnt.height();
 $('#preview_large').Jcrop({
  onChange: updatePreview,
  onSelect: updatePreview,
  onSelect: updateCoords,
  aspectRatio: xsize / ysize
 }, function () {
  var bounds = this.getBounds();
  boundx = bounds[0];
  boundy = bounds[1];
  jcrop_api = this;
  // $preview.appendTo(jcrop_api.ui.holder);
 });
 //更换图片时重新加载图片
 if (jcrop_api != undefined)
  jcrop_api.setImage(url);
 function updateCoords(c) {
  $('#x').val(c.x);
  $('#y').val(c.y);
  $('#w').val(c.w);
  $('#h').val(c.h);
 };
 function updatePreview(c) {
  if (parseInt(c.w) > 0) {
   var rx = xsize / c.w;
   var ry = ysize / c.h;

   $("#preview_large2").css({
    width: Math.round(rx * boundx) + 'px',
    height: Math.round(ry * boundy) + 'px',
    marginLeft: '-' + Math.round(rx * c.x) + 'px',
    marginTop: '-' + Math.round(ry * c.y) + 'px'
   });

   $pcnt = $('#preview_large3').parent(),
   xsize2 = $pcnt.height();
   ysize2 = $pcnt.height();
   var rx2 = xsize2 / c.w;
   var ry2 = ysize2 / c.h;

   $("#preview_large3").css({
    width: Math.round(rx2 * boundx) + 'px',
    height: Math.round(ry2 * boundy) + 'px',
    marginLeft: '-' + Math.round(rx2 * c.x) + 'px',
    marginTop: '-' + Math.round(ry2 * c.y) + 'px'
   });

  }
 };

  #region 判断文件夹是否存在，不存在则创建，返回文件夹路径
  private void CheckFileExistsCreateNew(string filepath)
  {
   if (!Directory.Exists(Server.MapPath(filepath)))
   {
    Directory.CreateDirectory(Server.MapPath(filepath));//创建文件夹
   }
  }
  #endregion

  #region 上传图片

  //上传头像
  [HttpPost]
  public JsonResult UploadifyHeader(HttpPostedFileBase fileData)
  {
   if (fileData != null)
   {
    try
    {
     // 文件上传后的保存路径

     string fileName = Path.GetFileName(fileData.FileName);// 原始文件名称
     string fileExtension = Path.GetExtension(fileName); // 文件扩展名
     string saveName =DateTime.Now.ToString("yyyyMMddHHmmssffff")+"_Y" + fileExtension; // 保存文件名称 
     string Url = "/Upload/" + CurrentUserInfo.Sys_RentCompany.CompanyKey + "/" + CurrentUserInfo.Comm_User.Id + "/UploadImg"; //在项目中创建一个Upload文件夹存放上传和截取的图片 CurrentUserInfo.Sys_RentCompany.CompanyKey 为session 保存的值 这里对应的文件夹的路径 自己可以定义
     string ShowUrl = Url + "/" + saveName;
     string filePhysicalPath = Server.MapPath(ShowUrl);
     //当前登陆人文件夹
     CheckFileExistsCreateNew(Url);

     fileData.SaveAs(filePhysicalPath);

     //压缩图片
     string YsFileImg = ImgHandler.YsImg(ShowUrl, filePhysicalPath);

     return Json(YsFileImg);
    }
    catch (Exception ex)
    {
     return Json(new { Success = false, Message = ex.Message }, JsonRequestBehavior.AllowGet);
    }
   }
   else
   {
    return Json(new { Success = false, Message = "请选择要上传的文件！" }, JsonRequestBehavior.AllowGet);
   }
  }

  //上传头像
  [HttpPost]
  public JsonResult UploadifyImg(HttpPostedFileBase fileData)
  {
   if (fileData != null)
   {
    try
    {
     // 文件上传后的保存路径

     string fileName = Path.GetFileName(fileData.FileName);// 原始文件名称
     string fileExtension = Path.GetExtension(fileName); // 文件扩展名
     string saveName = DateTime.Now.ToString("yyyyMMddHHmmssffff") + "_Y" + fileExtension; // 保存文件名称 
     //string filed = "/Upload/" + saveName;//路经
     string Url = "/Upload/" + CurrentUserInfo.Sys_RentCompany.CompanyKey + "/" + CurrentUserInfo.Comm_User.Id + "/UploadImg";
     string ShowUrl = Url + "/" + saveName;
     string filePhysicalPath = Server.MapPath(ShowUrl);
     //当前登陆人文件夹
     CheckFileExistsCreateNew(Url);

     fileData.SaveAs(filePhysicalPath);

     return Json(ShowUrl);
    }
    catch (Exception ex)
    {
     return Json(new { Success = false, Message = ex.Message }, JsonRequestBehavior.AllowGet);
    }
   }
   else
   {
    return Json(new { Success = false, Message = "请选择要上传的文件！" }, JsonRequestBehavior.AllowGet);
   }
  }

  //保存剪切的图片
  [HttpPost]
  public JsonResult JcropImg(FormCollection colls)
  {
   JsonFormatResult result = new JsonFormatResult { IsSuccess = true, Message = "保存成功！" };
   try
   {
    int x = int.Parse(colls["x"]);
    int y = int.Parse(colls["y"]);
    int w = int.Parse(colls["w"]);
    int h = int.Parse(colls["h"]);
    string imgsrc = colls["imgsrc"];
    string Path = ImgHandler.CutAvatar(imgsrc, x, y, w, h);
    result.Data = Path;
   }
   catch (Exception e)
   {
    result.IsSuccess = false;
    result.Message = e.Message;
   }
   return Json(result);
  } 
  #endregion