如何选择实体做成块

• 回答：

  c#中使用如下：

  
  

                  MxDrawSelectionSet ss = new MxDrawSelectionSet();
                  ss.Select(MCAD_McSelect.mcSelectionSetUserSelect, null, null, null);
  
  
                  List<Int64> aryId = new List<Int64>();
                  for (Int32 i = 0; i < ss.Count; i++)
                  {
                      MxDrawEntity ent = ss.Item(i);
                      if (ent != null)
                      {
                          aryId.Add(ent.ObjectID);
                          ent.Close();
                      }
                  }
                   MxDrawDatabase curDatabase = (MxDrawDatabase)(mxdraw.GetDatabase());
  
              double dMinX = 0, dMinY = 0, dMaxX = 0, dMaxY = 0;
              bool isFirstEnt = true;
              for (int l = 0; l < aryId.Count; l++)
              {
                  MxDrawMcDbObject pObj = curDatabase.ObjectIdToObject(aryId[l]);
                  if (pObj == null)
                      continue;
  
  
                  MxDrawPoint pt1Ob, pt2Ob;
                  
                  MxDrawEntity pEnt = (MxDrawEntity)pObj;
                  if (pEnt == null)
                      continue;
  
                  pEnt.GetBoundingBox(out pt1Ob, out pt2Ob);
  
                  MxDrawPoint minPt = (MxDrawPoint)pt1Ob;
                  MxDrawPoint maxPt = (MxDrawPoint)pt2Ob;
  
                  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 0;
              }
  
              MxDrawPoint pos = new MxDrawPoint();
              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.
              
              MxDrawBlockTable blkTable = curDatabase.GetBlockTable();
              MxDrawBlockTableRecord curSpace = curDatabase.CurrentSpace();
  
              String sNewBlakName;
           
                  MxDrawBlockTableRecord blkNewRec = blkTable.Add("");
                  sNewBlakName = blkNewRec.Name;
  
                  blkNewRec.Origin = pos;
  
                  for (int l = 0; l < aryId.Count; l++)
                  {
  
                      blkNewRec.AddCloneEntity(aryId[l]);
                      // 把以前实体删除 。
                      MxDrawMcDbObject pObj = curDatabase.ObjectIdToObject(aryId[l]);
                      if (pObj == null)
                          continue;
                      pObj.Erase();
                  }
        
  
              if (blkNewRec != null)
              {
                  MxDrawBlockReference blkRef = curSpace.InsertBlock(pos.x,pos.y, sNewBlakName, 1.0, 0.0);
                  MxDrawAttribute attrib = blkRef.AppendAttribute();
                  attrib.Position = pos;
                  attrib.AlignmentPoint = pos;
                  attrib.Oblique = 0.0;
                  attrib.Rotation = 0.0;
                  attrib.Height = 2.0;
                  attrib.TrueColor.SetRGB(255,0,0);
                 
                 // attrib.TextString = "这是一个属性文字的测试";
                 
                  attrib.Tag = "TestTag";
                  attrib.IsInvisible = false;
  
                  blkRef.Position = blkRef.Position;
              
                  return blkRef.ObjectID;
              }
              return 0;