//
// Written by Curtis Olson, started April 2000.
//
-// Copyright (C) 2000 Curtis L. Olson - curt@flightgear.org
+// Copyright (C) 2000 Curtis L. Olson - http://www.flightgear.org/~curt
//
// This program is free software; you can redistribute it and/or
// modify it under the terms of the GNU General Public License as
#include <simgear/math/sg_random.h>
#include <Aircraft/aircraft.hxx>
-#include <Navaids/mkrbeacons.hxx>
-#include <Time/FGEventMgr.hxx>
+#include <Navaids/navlist.hxx>
#include "marker_beacon.hxx"
bus_power(fgGetNode("/systems/electrical/outputs/navcom[0]", true)),
power_btn(fgGetNode("/radios/marker-beacon/power-btn", true)),
audio_btn(fgGetNode("/radios/marker-beacon/audio-btn", true)),
- servicable(fgGetNode("/instrumentation/marker-beacons/servicable", true)),
+ serviceable(fgGetNode("/instrumentation/marker-beacons/serviceable", true)),
need_update(true),
outer_blink(false),
power_btn->setBoolValue( true );
audio_btn->setBoolValue( true );
- servicable->setBoolValue( true );
+ serviceable->setBoolValue( true );
}
{
need_update = false;
- if ( has_power() && servicable->getBoolValue() ) {
+ if ( has_power() && serviceable->getBoolValue() ) {
// marker beacon blinking
bool light_on = ( outer_blink || middle_blink || inner_blink );
SGTimeStamp current;
}
+static bool check_beacon_range( double lon_rad, double lat_rad, double elev_m,
+ FGNavRecord *b )
+{
+ Point3D aircraft = sgGeodToCart( Point3D(lon_rad, lat_rad, elev_m) );
+ Point3D station = Point3D( b->get_x(), b->get_y(), b->get_z() );
+ // cout << " aircraft = " << aircraft << " station = " << station
+ // << endl;
+
+ double d = aircraft.distance3Dsquared( station ); // meters^2
+ // cout << " distance = " << d << " ("
+ // << FG_ILS_DEFAULT_RANGE * SG_NM_TO_METER
+ // * FG_ILS_DEFAULT_RANGE * SG_NM_TO_METER
+ // << ")" << endl;
+
+ // cout << " range = " << sqrt(d) << endl;
+
+ // cout << "elev = " << elev * SG_METER_TO_FEET
+ // << " current->get_elev() = " << current->get_elev() << endl;
+ double elev_ft = elev_m * SG_METER_TO_FEET;
+ double delev = elev_ft - b->get_elev_ft();
+
+ // max range is the area under r = 2.4 * alt or r^2 = 4000^2 - alt^2
+ // whichever is smaller. The intersection point is 1538 ...
+ double maxrange2; // feet^2
+ if ( delev < 1538.0 ) {
+ maxrange2 = 2.4 * 2.4 * delev * delev;
+ } else if ( delev < 4000.0 ) {
+ maxrange2 = 4000 * 4000 - delev * delev;
+ } else {
+ maxrange2 = 0.0;
+ }
+ maxrange2 *= SG_FEET_TO_METER * SG_FEET_TO_METER; // convert to meter^2
+ // cout << "delev = " << delev << " maxrange = " << maxrange << endl;
+
+ // match up to twice the published range so we can model
+ // reduced signal strength
+ if ( d < maxrange2 ) {
+ return true;
+ } else {
+ return false;
+ }
+}
+
// Update current nav/adf radio stations based on current postition
void FGMarkerBeacon::search()
{
- static FGMkrBeacon::fgMkrBeacType last_beacon = FGMkrBeacon::NOBEACON;
+ static fgMkrBeacType last_beacon = NOBEACON;
- double lon = lon_node->getDoubleValue() * SGD_DEGREES_TO_RADIANS;
- double lat = lat_node->getDoubleValue() * SGD_DEGREES_TO_RADIANS;
- double elev = alt_node->getDoubleValue() * SG_FEET_TO_METER;
+ double lon_rad = lon_node->getDoubleValue() * SGD_DEGREES_TO_RADIANS;
+ double lat_rad = lat_node->getDoubleValue() * SGD_DEGREES_TO_RADIANS;
+ double elev_m = alt_node->getDoubleValue() * SG_FEET_TO_METER;
////////////////////////////////////////////////////////////////////////
// Beacons.
////////////////////////////////////////////////////////////////////////
- FGMkrBeacon::fgMkrBeacType beacon_type
- = current_beacons->query( lon * SGD_RADIANS_TO_DEGREES,
- lat * SGD_RADIANS_TO_DEGREES, elev );
+ // get closest marker beacon
+ FGNavRecord *b
+ = globals->get_mkrlist()->findClosest( lon_rad, lat_rad, elev_m );
+
+ // cout << "marker beacon = " << b << " (" << b->get_type() << ")" << endl;
+
+ fgMkrBeacType beacon_type = NOBEACON;
+ bool inrange = false;
+ if ( b != NULL ) {
+ if ( b->get_type() == 7 ) {
+ beacon_type = OUTER;
+ } else if ( b->get_type() == 8 ) {
+ beacon_type = MIDDLE;
+ } else if ( b->get_type() == 9 ) {
+ beacon_type = INNER;
+ }
+ inrange = check_beacon_range( lon_rad, lat_rad, elev_m, b );
+ // cout << " inrange = " << inrange << endl;
+ }
outer_marker = middle_marker = inner_marker = false;
- if ( beacon_type == FGMkrBeacon::NOBEACON
- || !has_power() || !servicable->getBoolValue() )
+ if ( b == NULL || !inrange || !has_power() || !serviceable->getBoolValue() )
{
// cout << "no marker" << endl;
- beacon_type = FGMkrBeacon::NOBEACON;
globals->get_soundmgr()->stop( "outer-marker" );
globals->get_soundmgr()->stop( "middle-marker" );
globals->get_soundmgr()->stop( "inner-marker" );
- } else if ( beacon_type == FGMkrBeacon::OUTER ) {
+ } else if ( beacon_type == OUTER ) {
outer_marker = true;
// cout << "OUTER MARKER" << endl;
- if ( last_beacon != FGMkrBeacon::OUTER ) {
+ if ( last_beacon != OUTER ) {
if ( ! globals->get_soundmgr()->exists( "outer-marker" ) ) {
- SGSimpleSound *sound = beacon.get_outer();
+ SGSoundSample *sound = beacon.get_outer();
sound->set_volume( 0.3 );
globals->get_soundmgr()->add( sound, "outer-marker" );
}
} else {
globals->get_soundmgr()->stop( "outer-marker" );
}
- } else if ( beacon_type == FGMkrBeacon::MIDDLE ) {
+ } else if ( beacon_type == MIDDLE ) {
middle_marker = true;
// cout << "MIDDLE MARKER" << endl;
- if ( last_beacon != FGMkrBeacon::MIDDLE ) {
+ if ( last_beacon != MIDDLE ) {
if ( ! globals->get_soundmgr()->exists( "middle-marker" ) ) {
- SGSimpleSound *sound = beacon.get_middle();
+ SGSoundSample *sound = beacon.get_middle();
sound->set_volume( 0.3 );
globals->get_soundmgr()->add( sound, "middle-marker" );
}
} else {
globals->get_soundmgr()->stop( "middle-marker" );
}
- } else if ( beacon_type == FGMkrBeacon::INNER ) {
+ } else if ( beacon_type == INNER ) {
inner_marker = true;
// cout << "INNER MARKER" << endl;
- if ( last_beacon != FGMkrBeacon::INNER ) {
+ if ( last_beacon != INNER ) {
if ( ! globals->get_soundmgr()->exists( "inner-marker" ) ) {
- SGSimpleSound *sound = beacon.get_inner();
+ SGSoundSample *sound = beacon.get_inner();
sound->set_volume( 0.3 );
globals->get_soundmgr()->add( sound, "inner-marker" );
}
globals->get_soundmgr()->stop( "inner-marker" );
}
}
- last_beacon = beacon_type;
+
+ if ( inrange ) {
+ last_beacon = beacon_type;
+ } else {
+ last_beacon = NOBEACON;
+ }
}
projects / flightgear.git / blobdiff