如何计算两曲线间最短路径？

• 回答：

                   axMxDrawX1.StopAllTwinkeEnt();
                  MxDrawEntity ent1 = (MxDrawEntity)(axMxDrawX1.GetEntity("选择开始曲线:") );
                  if (ent1 == null)
                      return;
  
                  MxDrawEntity ent2 = (MxDrawEntity)(axMxDrawX1.GetEntity("选择结束曲线:"));
                  if (ent2 == null)
                      return;
  
                  MxDrawDatabase database = (MxDrawDatabase)(axMxDrawX1.GetDatabase());
  
                  MxDrawResbuf param = new MxDrawResbuf();
                  param.AddObjectId(ent1.ObjectID);
                  param.AddObjectId(ent2.ObjectID);
  
                  MxDrawResbuf ret = (MxDrawResbuf)(axMxDrawX1.CallEx("ExApp_ShortestPath",param));
                  if (ret.AtString(0) != "Ok")
                  {
                      MessageBox.Show("曲线不连通!");
                  }
                  else
                  {
                      for (int i = 1; i < ret.Count; i++)
                      {
                          Int64 lId = ret.AtObjectId(i);
                          axMxDrawX1.TwinkeEnt(lId);
  
                          // 由lId得到对象，并得到对象的坐标
                          MxDrawMcDbObject obj = database.ObjectIdToObject(lId);
                          if (obj == null)
                              continue;
  
                          if (obj is MxDrawLine)
                          {
                              MxDrawLine line = (MxDrawLine)obj;
                              MxDrawPoint sPt = (MxDrawPoint)(line.StartPoint);
                              MxDrawPoint ePt = (MxDrawPoint)(line.EndPoint);
  
                              //MessageBox.Show(sPt.x.ToString() + "," + sPt.y.ToString() + ","
                               //   + ePt.x.ToString() + "," + ePt.y.ToString()
                               //   );
                          }
                          else if (obj is MxDrawText)
                          {
                              MxDrawText text = (MxDrawText)obj;
                              // 是这文字对象
  
                          }
                      }
                  }