Topic: Help:Get a tree-struct from a power-grid drawing

[jlsec]

      I need get a tree-struct from a power-grid drawing,  there is not struction information in the drawing except geometry 。clear as mud ?

      I need a lisp program to analyse or recognize this drawing, then I can get a tree-struct datas.Like a list following:
      A main route:
  (parent node, line01,equipment01,line02,equipment02,line03,line04,...)
      Some branches and branches of branch ...
  (parent node,line01,equpment01,line02,line03,equipment02,...)
....

      The original drawing has no any struction information  except gemetric relation  or object  type:
      A electric line:                              a line or a unclosed polyline or arc or ellipse;
      A equipment (i.e  a transfrormer):a block or a closed polyline;

      A "realy" cross:   only inside a equipment;
      Not realy cross:   two cross line maybe is not contact.


     I already have a program,but works unsatisfied ...

[CAB]

Welcome to the Swamp.
Perhaps if you posted a sample DWG that would answer some remaining questions I have about the lines.

[jlsec]

Welcome to the Swamp.
Perhaps if you posted a sample DWG that would answer some remaining questions I have about the lines.

CAB:
     Thank for your reply.

      Here is the DWG file http://www.theswamp.org/index.php?action=dlattach;topic=45727.0;attach=26033.

      And another DWG file be attached .
     Could you give me some thought about this topic?