+
+// Update current nav/adf radio stations based on current postition
+void FGRadioStack::search ()
+{
+ double lon = longitudeVal->getDoubleValue() * DEG_TO_RAD;
+ double lat = latitudeVal->getDoubleValue() * DEG_TO_RAD;
+ double elev = altitudeVal->getDoubleValue() * FEET_TO_METER;
+
+ // nav1
+ FGILS ils;
+ FGNav nav;
+
+ if ( current_ilslist->query( lon, lat, elev, nav1_freq, &ils ) ) {
+ nav1_valid = true;
+ nav1_loc = true;
+ nav1_has_dme = ils.get_has_dme();
+ nav1_has_gs = ils.get_has_gs();
+
+ nav1_loclon = ils.get_loclon();
+ nav1_loclat = ils.get_loclat();
+ nav1_gslon = ils.get_gslon();
+ nav1_gslat = ils.get_gslat();
+ nav1_dmelon = ils.get_dmelon();
+ nav1_dmelat = ils.get_dmelat();
+ nav1_elev = ils.get_gselev();
+ nav1_magvar = 0;
+ nav1_effective_range = FG_ILS_DEFAULT_RANGE;
+ nav1_target_gs = ils.get_gsangle();
+ nav1_radial = ils.get_locheading();
+ while ( nav1_radial < 0.0 ) { nav1_radial += 360.0; }
+ while ( nav1_radial > 360.0 ) { nav1_radial -= 360.0; }
+ nav1_x = ils.get_x();
+ nav1_y = ils.get_y();
+ nav1_z = ils.get_z();
+ nav1_gs_x = ils.get_gs_x();
+ nav1_gs_y = ils.get_gs_y();
+ nav1_gs_z = ils.get_gs_z();
+ nav1_dme_x = ils.get_dme_x();
+ nav1_dme_y = ils.get_dme_y();
+ nav1_dme_z = ils.get_dme_z();
+ // cout << "Found an ils station in range" << endl;
+ // cout << " id = " << ils.get_locident() << endl;
+ } else if ( current_navlist->query( lon, lat, elev, nav1_freq, &nav ) ) {
+ nav1_valid = true;
+ nav1_loc = false;
+ nav1_has_dme = nav.get_has_dme();
+ nav1_has_gs = false;
+ nav1_loclon = nav.get_lon();
+ nav1_loclat = nav.get_lat();
+ nav1_elev = nav.get_elev();
+ nav1_magvar = nav.get_magvar();
+ nav1_effective_range = kludgeRange(nav1_elev, elev, nav.get_range());
+ nav1_target_gs = 0.0;
+ nav1_radial = nav1_sel_radial;
+ nav1_x = nav1_dme_x = nav.get_x();
+ nav1_y = nav1_dme_y = nav.get_y();
+ nav1_z = nav1_dme_z = nav.get_z();
+ // cout << "Found a vor station in range" << endl;
+ // cout << " id = " << nav.get_ident() << endl;
+ } else {
+ nav1_valid = false;
+ nav1_radial = 0;
+ nav1_dme_dist = 0;
+ // cout << "not picking up vor1. :-(" << endl;
+ }
+
+ if ( current_ilslist->query( lon, lat, elev, nav2_freq, &ils ) ) {
+ nav2_valid = true;
+ nav2_loc = true;
+ nav2_has_dme = ils.get_has_dme();
+ nav2_has_gs = ils.get_has_gs();
+
+ nav2_loclon = ils.get_loclon();
+ nav2_loclat = ils.get_loclat();
+ nav2_elev = ils.get_gselev();
+ nav2_magvar = 0;
+ nav2_effective_range = FG_ILS_DEFAULT_RANGE;
+ nav2_target_gs = ils.get_gsangle();
+ nav2_radial = ils.get_locheading();
+ while ( nav2_radial < 0.0 ) { nav2_radial += 360.0; }
+ while ( nav2_radial > 360.0 ) { nav2_radial -= 360.0; }
+ nav2_x = ils.get_x();
+ nav2_y = ils.get_y();
+ nav2_z = ils.get_z();
+ nav2_gs_x = ils.get_gs_x();
+ nav2_gs_y = ils.get_gs_y();
+ nav2_gs_z = ils.get_gs_z();
+ nav2_dme_x = ils.get_dme_x();
+ nav2_dme_y = ils.get_dme_y();
+ nav2_dme_z = ils.get_dme_z();
+ // cout << "Found an ils station in range" << endl;
+ // cout << " id = " << ils.get_locident() << endl;
+ } else if ( current_navlist->query( lon, lat, elev, nav2_freq, &nav ) ) {
+ nav2_valid = true;
+ nav2_loc = false;
+ nav2_has_dme = nav.get_has_dme();
+ nav2_has_dme = false;
+ nav2_loclon = nav.get_lon();
+ nav2_loclat = nav.get_lat();
+ nav2_elev = nav.get_elev();
+ nav2_magvar = nav.get_magvar();
+ nav2_effective_range = kludgeRange(nav2_elev, elev, nav.get_range());
+ nav2_target_gs = 0.0;
+ nav2_radial = nav2_sel_radial;
+ nav2_x = nav2_dme_x = nav.get_x();
+ nav2_y = nav2_dme_y = nav.get_y();
+ nav2_z = nav2_dme_z = nav.get_z();
+ // cout << "Found a vor station in range" << endl;
+ // cout << " id = " << nav.get_ident() << endl;
+ } else {
+ nav2_valid = false;
+ nav2_radial = 0;
+ nav2_dme_dist = 0;
+ // cout << "not picking up vor2. :-(" << endl;
+ }
+
+ // adf
+ if ( current_navlist->query( lon, lat, elev, adf_freq, &nav ) ) {
+ adf_valid = true;
+
+ adf_lon = nav.get_lon();
+ adf_lat = nav.get_lat();
+ adf_elev = nav.get_elev();
+ adf_effective_range = kludgeRange(adf_elev, elev, nav.get_range());
+ adf_x = nav.get_x();
+ adf_y = nav.get_y();
+ adf_z = nav.get_z();
+ // cout << "Found an adf station in range" << endl;
+ // cout << " id = " << nav.get_ident() << endl;
+ } else {
+ adf_valid = false;
+ // cout << "not picking up adf. :-(" << endl;
+ }
+}
+
+
+// return the amount of heading needle deflection, returns a value
+// clamped to the range of ( -10 , 10 )
+double FGRadioStack::get_nav1_heading_needle_deflection() const {
+ double r;
+
+ if ( nav1_inrange ) {
+ r = nav1_heading - nav1_radial;
+ // cout << "Radial = " << nav1_radial
+ // << " Bearing = " << nav1_heading << endl;
+
+ while ( r > 180.0 ) { r -= 360.0;}
+ while ( r < -180.0 ) { r += 360.0;}
+ if ( fabs(r) > 90.0 ) {
+ r = ( r<0.0 ? -r-180.0 : -r+180.0 );
+ if ( nav1_loc ) {
+ r = -r;
+ }
+ }
+
+ // According to Robin Peel, the ILS is 4x more sensitive than a vor
+ if ( nav1_loc ) { r *= 4.0; }
+ if ( r < -10.0 ) { r = -10.0; }
+ if ( r > 10.0 ) { r = 10.0; }
+ } else {
+ r = 0.0;
+ }
+
+ return r;
+}
+
+// return the amount of heading needle deflection, returns a value
+// clamped to the range of ( -10 , 10 )
+double FGRadioStack::get_nav2_heading_needle_deflection() const {
+ double r;
+
+ if ( nav2_inrange ) {
+ r = nav2_heading - nav2_radial;
+ // cout << "Radial = " << nav2_radial
+ // << " Bearing = " << nav2_heading << endl;
+
+ while (r> 180.0) r-=360.0;
+ while (r<-180.0) r+=360.0;
+ if ( fabs(r) > 90.0 )
+ r = ( r<0.0 ? -r-180.0 : -r+180.0 );
+ // According to Robin Peel, the ILS is 4x more sensitive than a vor
+ if ( nav2_loc ) r *= 4.0;
+ if ( r < -10.0 ) r = -10.0;
+ if ( r > 10.0 ) r = 10.0;
+ } else {
+ r = 0.0;
+ }
+
+ return r;
+}
+
+// return the amount of glide slope needle deflection (.i.e. the
+// number of degrees we are off the glide slope * 5.0
+double FGRadioStack::get_nav1_gs_needle_deflection() const {
+ if ( nav1_inrange && nav1_has_gs ) {
+ double x = nav1_gs_dist;
+ double y = (FGBFI::getAltitude() - nav1_elev) * FEET_TO_METER;
+ double angle = atan2( y, x ) * RAD_TO_DEG;
+ return (nav1_target_gs - angle) * 5.0;
+ } else {
+ return 0.0;
+ }
+}
+
+
+// return the amount of glide slope needle deflection (.i.e. the
+// number of degrees we are off the glide slope * 5.0
+double FGRadioStack::get_nav2_gs_needle_deflection() const {
+ if ( nav2_inrange && nav2_has_gs ) {
+ double x = nav2_gs_dist;
+ double y = (FGBFI::getAltitude() - nav2_elev) * FEET_TO_METER;
+ double angle = atan2( y, x ) * RAD_TO_DEG;
+ return (nav2_target_gs - angle) * 5.0;
+ } else {
+ return 0.0;
+ }
+}
+
+
+/**
+ * Return true if the NAV1 TO flag should be active.
+ */
+bool
+FGRadioStack::get_nav1_to_flag () const
+{
+ if (nav1_inrange) {
+ double offset = fabs(nav1_heading - nav1_radial);
+ if (nav1_loc)
+ return true;
+ else
+ return (offset <= 90.0 || offset >= 270.0);
+ } else {
+ return false;
+ }
+}
+
+
+/**
+ * Return true if the NAV1 FROM flag should be active.
+ */
+bool
+FGRadioStack::get_nav1_from_flag () const
+{
+ if (nav1_inrange) {
+ double offset = fabs(nav1_heading - nav1_radial);
+ if (nav1_loc)
+ return false;
+ else
+ return (offset > 90.0 && offset < 270.0);
+ } else {
+ return false;
+ }
+}
+
+
+/**
+ * Return true if the NAV2 TO flag should be active.
+ */
+bool
+FGRadioStack::get_nav2_to_flag () const
+{
+ if (nav2_inrange) {
+ double offset = fabs(nav2_heading - nav2_radial);
+ if (nav2_loc)
+ return true;
+ else
+ return (offset <= 90.0 || offset >= 270.0);
+ } else {
+ return false;
+ }
+}
+
+
+/**
+ * Return true if the NAV2 FROM flag should be active.
+ */
+bool
+FGRadioStack::get_nav2_from_flag () const
+{
+ if (nav2_inrange) {
+ double offset = fabs(nav2_heading - nav2_radial);
+ if (nav2_loc)
+ return false;
+ else
+ return (offset > 90.0 && offset < 270.0);
+ } else {
+ return false;
+ }
+}
+