Old waypoints and waypoints modified

[aymeric blanchet]

Hi , I create a direction service with waypoints(POI's). And after the directions services, I collect the legs. But how associate my old waypoints(POI's) with the legs? How I know the latlng of the marker A, B,..?
Example:
POI's:  Y:(20.111,21.111) Z:(30.111,31.111)
Legs: A:(20.2,21.2) intermediate(25.2,25.2) B:(30.2,31.2)
How associate Y with A , Z with B?

Thanks you;
PS: Sorry for my english