create center line between polygons

Hello my dears:
First, I apologize for referring you to another site.
because of this that I'm poor Language English and I wanted to save time.
in attached file I pose a problem,
I want draw center line (polyline) between the exist polygons,
regardless of how they connect in start point and end point.
Unfortunately, I search in internet but do't got the results
Except in ArcGIS-Esri Software
Is in the map3d software can be draw centerline like ArcGIS-Esri (Collapse Dual Lines To Centerline) or need to code
I am grateful guide

If you want help in this forum, ask your question here.

No one is here ?

Yes, but it's a tough question and will involve advanced programming. Do you program?

thank you Ed jobe for reply
I'm programming autolisp
But to the extent that I would meet my basic needs.