Perform the Euclidean distance between the current position of a node and its destination (Point of Interest).
[D] = NL_F_DistanceSiDj(Sx,Sy,Dx,Dy)
X-coordinate (current position).
Y-coordinate (current position).
X-coordinate (PoI).
Y-coordinate (PoI).
Euclidean distance.
NL_F_DistanceSiDj performs the Euclidean distance D between the current position of the node N located in and its destination
(Point of Interest).