From 5da3d64ede974091fc47a044041d8ce38a3c3308 Mon Sep 17 00:00:00 2001
From: jmt <jmt>
Date: Sun, 14 Mar 2010 12:00:54 +0000
Subject: [PATCH] Overload the SGMagVar::update method to take an SGGeod.

---
 simgear/magvar/magvar.cxx | 7 +++++++
 simgear/magvar/magvar.hxx | 8 ++++++++
 2 files changed, 15 insertions(+)

diff --git a/simgear/magvar/magvar.cxx b/simgear/magvar/magvar.cxx
index 11f59b8b..095c9718 100644
--- a/simgear/magvar/magvar.cxx
+++ b/simgear/magvar/magvar.cxx
@@ -24,6 +24,7 @@
 #include <math.h>
 
 #include <simgear/magvar/magvar.hxx>
+#include <simgear/math/SGMath.hxx>
 
 #include "coremag.hxx"
 #include "magvar.hxx"
@@ -47,6 +48,12 @@ void SGMagVar::update( double lon, double lat, double alt_m, double jd ) {
     magdip = atan(field[5]/sqrt(field[3]*field[3]+field[4]*field[4]));
 }
 
+void SGMagVar::update( const SGGeod& geod, double jd ) {
+
+  update(geod.getLongitudeDeg(), geod.getLatitudeDeg(),
+    geod.getElevationM(), jd);
+}
+
 
 double sgGetMagVar( double lon, double lat, double alt_m, double jd ) {
     // cout << "lat = " << lat << " lon = " << lon << " elev = " << alt_m
diff --git a/simgear/magvar/magvar.hxx b/simgear/magvar/magvar.hxx
index c2e80bc4..6a97e5ea 100644
--- a/simgear/magvar/magvar.hxx
+++ b/simgear/magvar/magvar.hxx
@@ -33,6 +33,9 @@
 #endif
 
 
+// forward decls
+class SGGeod;
+
 /**
  * Magnetic variation wrapper class.
  *
@@ -78,6 +81,11 @@ public:
      */
     void update( double lon, double lat, double alt_m, double jd );
 
+    /**
+     * overloaded variant taking an SGGeod to specify position
+     */
+    void update( const SGGeod& geod, double jd );
+
     /** @return the current magnetic variation in radians. */
     double get_magvar() const { return magvar; }