started adding earth-mapping

some new helper methods
added support for floorplan metadata load/save

geo/Point2.h

@@ -17,6 +17,8 @@ struct Point2 {
 	/** ctor */
 	Point2(const float x, const float y) : x(x), y(y) {;}
 
+	Point2 operator - () const {return Point2(-x, -y);}
+
 
 	Point2 operator + (const Point2& o) const {return Point2(x+o.x, y+o.y);}
 
@@ -60,4 +62,9 @@ struct Point2 {
 
 };
 
+inline void swap(Point2& p1, Point2& p2) {
+	std::swap(p1.x, p2.x);
+	std::swap(p1.y, p2.y);
+}
+
 #endif // POINT2_H