How to get the start point (lat, lng) and end point (lat, lng) for any particular polygon line in ui-gmap-polygon? #2017

Hi,
https://drive.google.com/file/d/0Bz-ICOUBYSBEQVBwSVdKU0JWMms/view?usp=sharing

The above link has a image of map with 5 markers used and using ui-gmap-polygon, I have made the polygon. But I am unable to get the start point lat lng values as well as end point lat lng values as shown in image. I need some event in ui-gmap-polygon which onhover to any polygon lines, gives the object of start point lat lng and end point lat lng. If that kind of event is already present in ui-gmap-polygon, then please let me know. Thanks in advance.

Thanks
shub810