1 files changed, 24 insertions, 0 deletions
diff --git a/src/positioning/qwebmercator.cpp b/src/positioning/qwebmercator.cpp
index d22258a7..da35c7d7 100644
--- a/src/positioning/qwebmercator.cpp
+++ b/src/positioning/qwebmercator.cpp
@@ -101,6 +101,30 @@ QGeoCoordinate QWebMercator::mercatorToCoord(const QDoubleVector2D &mercator)
     return QGeoCoordinate(lat, lng, 0.0);
 }
 
+QGeoCoordinate QWebMercator::mercatorToCoordClamped(const QDoubleVector2D &mercator)
+{
+    double fx = mercator.x();
+    double fy = mercator.y();
+
+    if (fy < 0.0)
+        fy = 0.0;
+    else if (fy > 1.0)
+        fy = 1.0;
+
+    double lat = (180.0 / M_PI) * (2.0 * std::atan(std::exp(M_PI * (1.0 - 2.0 * fy))) - (M_PI / 2.0));
+
+    double lng;
+    if (fx >= 0) {
+        lng = realmod(fx, 1.0);
+    } else {
+        lng = realmod(1.0 - realmod(-1.0 * fx, 1.0), 1.0);
+    }
+
+    lng = lng * 360.0 - 180.0;
+
+    return QGeoCoordinate(lat, lng, 0.0);
+}
+
 QGeoCoordinate QWebMercator::coordinateInterpolation(const QGeoCoordinate &from, const QGeoCoordinate &to, qreal progress)
 {
     QDoubleVector2D s = QWebMercator::coordToMercator(from);