+
+
+// Calculate course and distances. For WGS84 and SPHERICAL
+// coordinates lat, lon, and course are in degrees, alt and distance
+// are in meters. For CARTESIAN coordinates x = lon, y = lat. Course
+// is in degrees and distance is in what ever units x and y are in.
+void SGWayPoint::CourseAndDistance( const double cur_lon,
+ const double cur_lat,
+ const double cur_alt,
+ double *course, double *distance ) const {
+ if ( mode == WGS84 ) {
+ double reverse;
+ geo_inverse_wgs_84( cur_alt, cur_lat, cur_lon, target_lat, target_lon,
+ course, &reverse, distance );
+ } else if ( mode == SPHERICAL ) {
+ Point3D current( cur_lon * DEG_TO_RAD, cur_lat * DEG_TO_RAD, 0.0 );
+ Point3D target( target_lon * DEG_TO_RAD, target_lat * DEG_TO_RAD, 0.0 );
+ calc_gc_course_dist( current, target, course, distance );
+ *course = 360.0 - *course * RAD_TO_DEG;
+ } else if ( mode == CARTESIAN ) {
+ double dx = target_lon - cur_lon;
+ double dy = target_lat - cur_lat;
+ *course = -atan2( dy, dx ) * RAD_TO_DEG - 90;
+ while ( *course < 0 ) {
+ *course += 360.0;
+ }
+ while ( *course > 360.0 ) {
+ *course -= 360.0;
+ }
+ *distance = sqrt( dx * dx + dy * dy );
+ }
+}
+
+// Calculate course and distances between two waypoints
+void SGWayPoint::CourseAndDistance( const SGWayPoint &wp,
+ double *course, double *distance ) const {
+ CourseAndDistance( wp.get_target_lon(),
+ wp.get_target_lat(),
+ wp.get_target_alt(),
+ course, distance );
+}