如何将选中的实体做成块？

• 回答：

  js代码如下：

  
  

  //实例化一个构造选择集进行过滤,该类封装了选择集及其处理函数。
  var ss = mxOcx.NewSelectionSet();
  //构造一个过滤链表
  var spFilte = mxOcx.NewResbuf();
  //用户选择对象  得到用户选取的实体
  ss.Select2(8, null, null, null, spFilte);
  
  var aryId = new Array();
  for (var i = 0; i < ss.Count; i++)
  {
      var ent = ss.Item(i);
      if (ent != null)
      {
          aryId.push(ent.ObjectID);
          ent.Close();
      }
  }
  //返回控件的数据库对象
  var curDatabase =mxOcx.GetDatabase();
  var dMinX = 0, dMinY = 0, dMaxX = 0, dMaxY = 0;
  var isFirstEnt = true;
  for (var l = 0; l < aryId.length; l++)
  {
      var pObj = curDatabase.ObjectIdToObject(aryId[l]);
      if (pObj == null)
          continue;
      var pEnt = pObj;
      if (pEnt == null)
          continue;
      var  points = pEnt.GetBoundingBox2();
  
      var minPt = points.Item(0);
      var maxPt = points.Item(1);
  
      if (minPt != null && maxPt != null)
      {
          if(isFirstEnt)
          {
              dMinX = minPt.x;
              dMinY = minPt.y;
              dMaxX = maxPt.x;
              dMaxY = maxPt.y;
              isFirstEnt = false;
          }
          else
          {
              if (dMinX > minPt.x)
                  dMinX = minPt.x;
  
              if (dMinY > minPt.y)
                  dMinY = minPt.y;
  
              if (dMaxX < maxPt.x)
                  dMaxX = maxPt.x;
  
              if (dMaxY < maxPt.y)
                  dMaxY = maxPt.y;
          }
      }
  }
  
  if(isFirstEnt)
  {
      // 没有实体
      return;
  }
  var pos = mxOcx.NewPoint();
  pos.x = dMinX + (dMaxX - dMinX) / 2.0;
  pos.y = dMinY + (dMaxY - dMinY) / 2.0;
  
  // 检查新创建的块名，在当前数据库是否已经存在.
  
  var blkTable = curDatabase.GetBlockTable();
  var curSpace = curDatabase.CurrentSpace();
  
  var sNewBlakName;
  
  var blkNewRec = blkTable.Add("");
  sNewBlakName = blkNewRec.Name;
  
  blkNewRec.Origin = pos;
  
  for (var l = 0; l < aryId.length; l++)
  {
  
      blkNewRec.AddCloneEntity(aryId[l]);
      // 把以前实体删除 。
      var pObj = curDatabase.ObjectIdToObject(aryId[l]);
      if (pObj == null)
          continue;
      pObj.Erase();
  }
  if (blkNewRec != null)
  {
      var blkRef = curSpace.InsertBlock(pos.x,pos.y, sNewBlakName, 1.0, 0.0);
      var attrib = blkRef.AppendAttribute();
      attrib.Position = pos;
      attrib.AlignmentPoint = pos;
      attrib.Oblique = 0.0;
      attrib.Rotation = 0.0;
      attrib.Height = 2.0;
      attrib.Tag = "TestTag";
      attrib.IsInvisible = false;
  
      blkRef.Position = blkRef.Position;
  
  }
  
  return;