Add helper function to determine the distance between two points

And use this to find a dive site within a certain radius of a GPS fix.
This will be used to figure out if dive sites might be the same.

This uses a new Qt5 component (Positioning) which was added in Qt5.2.

Signed-off-by: Dirk Hohndel <dirk@hohndel.org>

1 files changed, 8 insertions, 0 deletions

diff --git a/qt-ui/globe.cpp b/qt-ui/globe.cpp
index b8e0ec87e..76d48b7ba 100644
--- a/qt-ui/globe.cpp
+++ b/qt-ui/globe.cpp
@@ -1,4 +1,5 @@
 #include "globe.h"
+#include <QGeoCoordinate>
 #ifndef NO_MARBLE
 #include "mainwindow.h"
 #include "helpers.h"
@@ -392,3 +393,10 @@ void GlobeGPS::reload()
 {
 }
 #endif
+
+extern "C" double getDistance(int lat1, int lon1, int lat2, int lon2)
+{
+	QGeoCoordinate c1(lat1 / 1000000.0, lon1 / 1000000.0);
+	QGeoCoordinate c2(lat2 / 1000000.0, lon2 / 1000000.0);
+	return c1.distanceTo(c2);
+}