如何剪切图形？

• 回答：

          private void CutDwgFun()
          {
              MxDrawUtility mxUtility = new MxDrawUtility();
  
              MxDrawPoint pt = (MxDrawPoint)(mxUtility.GetPoint(null,"\n 输入剪切矩形框左下角点:"));
  
              if (pt == null)
              {
                MessageBox.Show("用户取消..");
                return;
              }
  
              MxDrawResbuf param = new MxDrawResbuf();
              param.AddDouble(pt.x);
              param.AddDouble(pt.y);
  
              MxDrawResbuf retParam = (MxDrawResbuf)axMxDrawX1.CallEx("Mx_GetCorner", param);
  
              if(retParam.AtString(0) == "Ok")
              {
                  SaveFileDialog sfd = new SaveFileDialog();
                  sfd.Filter = "dwg 文件(*.dwg)|*.dwg";
  
                  if (sfd.ShowDialog() != DialogResult.OK)
                  {
                      return;
                  }
  
                  MxDrawResbuf param2 = new MxDrawResbuf();
                  param2.AddDouble(retParam.AtDouble(1));
                  param2.AddDouble(retParam.AtDouble(2));
                  param2.AddDouble(pt.x);
                  param2.AddDouble(pt.y);
                  param2.AddString(sfd.FileName);
  
                  MxDrawResbuf ret;
                  ret = (MxDrawResbuf)axMxDrawX1.CallEx("ExApp_CutDwg", param2);
                  if(ret.AtString(0) == "Ok")
                  {
                      MessageBox.Show("剪切成功");
                  }
                  else
                  {
                      MessageBox.Show("剪切失败");
                  }
              }
    
          }