[core] Move ProjectedMeters to projection.hpp

1 files changed, 28 insertions, 1 deletions

diff --git a/include/mbgl/util/projection.hpp b/include/mbgl/util/projection.hpp
index ed34261b18..3cc1146513 100644
--- a/include/mbgl/util/projection.hpp
+++ b/include/mbgl/util/projection.hpp
@@ -5,9 +5,36 @@
 #include <mbgl/util/geometry.hpp>
 #include <mbgl/math/clamp.hpp>
 
-
 namespace mbgl {
 
+class ProjectedMeters {
+private:
+    double _northing; // Distance measured northwards.
+    double _easting;  // Distance measured eastwards.
+
+public:
+    ProjectedMeters(double n_ = 0, double e_ = 0)
+        : _northing(n_), _easting(e_) {
+        if (std::isnan(_northing)) {
+            throw std::domain_error("northing must not be NaN");
+        }
+        if (std::isnan(_easting)) {
+            throw std::domain_error("easting must not be NaN");
+        }
+    }
+
+    double northing() const { return _northing; }
+    double easting() const { return _easting; }
+
+    friend bool operator==(const ProjectedMeters& a, const ProjectedMeters& b) {
+        return a._northing == b._northing && a._easting == b._easting;
+    }
+
+    friend bool operator!=(const ProjectedMeters& a, const ProjectedMeters& b) {
+        return !(a == b);
+    }
+};
+
 // Spherical Mercator projection
 // http://docs.openlayers.org/library/spherical_mercator.html
 class Projection {