A method to add two SWPoints together.
Parameter  | 
Value  | 
|---|---|
point1: a point set object (SWPoint)  | 
isn93 map point locations.  | 
point2: a point set object (SWPoint)  | 
isn93 map point locations.  | 
Return  | 
Value  | 
|---|---|
object:  | 
A point set object (SWPoint).  | 
Example:
var point1 = SWPoint.create(359583, 406481);
var point2 = SWPoint.create(359603, 406471);
var point = SWPoint.sum(point1, point2);