Added support for Transversal Mercator projection

src/mercator.cpp

@@ -0,0 +1,13 @@
+#include <cmath>
+#include "rd.h"
+#include "mercator.h"
+
+QPointF Mercator::ll2xy(const Coordinates &c) const
+{
+	return QPointF(c.lon(), rad2deg(log(tan(M_PI/4.0 + deg2rad(c.lat())/2.0))));
+}
+
+Coordinates Mercator::xy2ll(const QPointF &p) const
+{
+	return Coordinates(p.x(), rad2deg(2 * atan(exp(deg2rad(p.y()))) - M_PI/2));
+}