- FGRunway r;
- double found_dir = 0.0;
-
- if ( !search( aptid, &r ) ) {
- SG_LOG( SG_GENERAL, SG_ALERT,
- "Failed to find " << aptid << " in database." );
- return false;
- }
-
- double diff;
- double min_diff = 360.0;
-
- while ( r.id == aptid ) {
- // forward direction
- diff = tgt_hdg - r.heading;
- while ( diff < -180.0 ) { diff += 360.0; }
- while ( diff > 180.0 ) { diff -= 360.0; }
- diff = fabs(diff);
- // SG_LOG( SG_GENERAL, SG_INFO,
- // "Runway " << r.rwy_no << " heading = " << r.heading <<
- // " diff = " << diff );
- if ( diff < min_diff ) {
- min_diff = diff;
- runway = &r;
- found_dir = 0;
- }
-
- // reverse direction
- diff = tgt_hdg - r.heading - 180.0;
- while ( diff < -180.0 ) { diff += 360.0; }
- while ( diff > 180.0 ) { diff -= 360.0; }
- diff = fabs(diff);
- // SG_LOG( SG_GENERAL, SG_INFO,
- // "Runway -" << r.rwy_no << " heading = " <<
- // r.heading + 180.0 <<
- // " diff = " << diff );
- if ( diff < min_diff ) {
- min_diff = diff;
- runway = &r;
- found_dir = 180.0;
- }
-
- next( &r );
- }
-
- // SG_LOG( SG_GENERAL, SG_INFO, "closest runway = " << runway->rwy_no
- // << " + " << found_dir );
-
- double heading = runway->heading + found_dir;
- while ( heading >= 360.0 ) { heading -= 360.0; }
- runway->heading = heading;
-
- return true;