X-Git-Url: https://git.mxchange.org/?a=blobdiff_plain;f=simgear%2Fmath%2FSGGeod.hxx;h=86e38a1f655889801f36be830c2dbc2e0d97456d;hb=6a7c2000027cd22eea603e936ddbad1a5bfc8b04;hp=50c6b97dac2fd4c82fbb9901de8c3e071aa073ee;hpb=899623f71bc687a3bbc8167ce582692694e4d56d;p=simgear.git

diff --git a/simgear/math/SGGeod.hxx b/simgear/math/SGGeod.hxx
index 50c6b97d..86e38a1f 100644
--- a/simgear/math/SGGeod.hxx
+++ b/simgear/math/SGGeod.hxx
@@ -20,6 +20,10 @@
 
 #include <simgear/constants.h>
 
+#ifndef NO_OPENSCENEGRAPH_INTERFACE
+#include <osg/Matrix>
+#endif
+
 // #define SG_GEOD_NATIVE_DEGREE
 
 /// Class representing a geodetic location
@@ -40,6 +44,10 @@ public:
   static SGGeod fromRadM(double lon, double lat, double elevation);
   /// Factory from angular values in degrees and elevation in m
   static SGGeod fromDegM(double lon, double lat, double elevation);
+  /// Factory from an other SGGeod and a different elevation in m
+  static SGGeod fromGeodM(const SGGeod& geod, double elevation);
+  /// Factory from an other SGGeod and a different elevation in ft
+  static SGGeod fromGeodFt(const SGGeod& geod, double elevation);
   /// Factory to convert position from a cartesian position assumed to be
   /// in wgs84 measured in meters
   /// Note that this conversion is relatively expensive to compute
@@ -78,13 +86,27 @@ public:
   /// Set the geodetic elevation from the argument given in feet
   void setElevationFt(double elevation);
 
+#ifndef NO_OPENSCENEGRAPH_INTERFACE
+  // Create a local coordinate frame in the earth-centered frame of
+  // reference. X points north, Z points down.
+  // makeSimulationFrameRelative() only includes rotation.
+  osg::Matrix makeSimulationFrameRelative() const;
+  osg::Matrix makeSimulationFrame() const;
+
+  // Create a Z-up local coordinate frame in the earth-centered frame
+  // of reference. This is what scenery models, etc. expect.
+  // makeZUpFrameRelative() only includes rotation.
+  osg::Matrix makeZUpFrameRelative() const;
+  osg::Matrix makeZUpFrame() const;
+#endif
 private:
   /// This one is private since construction is not unique if you do
   /// not know the units of the arguments. Use the factory methods for
   /// that purpose
   SGGeod(double lon, double lat, double elevation);
 
-  /// The actual data, angles in degree, elevation in meters
+  //// FIXME: wrong comment!
+  /// The actual data, angles in degrees, elevation in meters
   /// The rationale for storing the values in degrees is that most code places
   /// in flightgear/terragear use degrees as a nativ input and output value.
   /// The places where it makes sense to use radians is when we convert
@@ -178,6 +200,20 @@ SGGeod::fromDegM(double lon, double lat, double elevation)
 #endif
 }
 
+inline
+SGGeod
+SGGeod::fromGeodM(const SGGeod& geod, double elevation)
+{
+  return SGGeod(geod._lon, geod._lat, elevation);
+}
+
+inline
+SGGeod
+SGGeod::fromGeodFt(const SGGeod& geod, double elevation)
+{
+  return SGGeod(geod._lon, geod._lat, elevation*SG_FEET_TO_METER);
+}
+
 inline
 SGGeod
 SGGeod::fromCart(const SGVec3<double>& cart)