134 lines
3.7 KiB
C++
134 lines
3.7 KiB
C++
// groundlist.cxx -- ATC Ground data management class
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//
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// Written by David Luff, started November 2002.
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// Based on navlist.cxx by Curtis Olson, started April 2000.
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//
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// Copyright (C) 2000 Curtis L. Olson - curt@flightgear.org
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//
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// This program is free software; you can redistribute it and/or
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// modify it under the terms of the GNU General Public License as
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// published by the Free Software Foundation; either version 2 of the
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// License, or (at your option) any later version.
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//
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// This program is distributed in the hope that it will be useful, but
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// WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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// General Public License for more details.
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//
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// You should have received a copy of the GNU General Public License
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// along with this program; if not, write to the Free Software
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// Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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#ifdef HAVE_CONFIG_H
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# include <config.h>
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#endif
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#include <simgear/debug/logstream.hxx>
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#include <simgear/misc/sgstream.hxx>
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#include <simgear/math/sg_geodesy.hxx>
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#include <simgear/math/sg_random.h>
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#include "groundlist.hxx"
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FGGroundList *current_groundlist;
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// Constructor
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FGGroundList::FGGroundList( void ) {
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}
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// Destructor
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FGGroundList::~FGGroundList( void ) {
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}
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// load the navaids and build the map
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bool FGGroundList::init( SGPath path ) {
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groundlist.erase( groundlist.begin(), groundlist.end() );
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sg_gzifstream in( path.str() );
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if ( !in.is_open() ) {
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SG_LOG( SG_GENERAL, SG_ALERT, "Cannot open file: " << path.str() );
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exit(-1);
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}
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// read in each line of the file
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in >> skipcomment;
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#ifdef __MWERKS__
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char c = 0;
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while ( in.get(c) && c != '\0' ) {
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in.putback(c);
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#else
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while ( !in.eof() ) {
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#endif
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FGGround g;
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in >> g;
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if ( g.get_type() == '[' ) {
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break;
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}
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//cout << "id = " << t.GetIdent() << endl;
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//cout << " type = " << t.get_type() << endl;
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//cout << " lon = " << t.get_lon() << endl;
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//cout << " lat = " << t.get_lat() << endl;
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//cout << " elev = " << t.get_elev() << endl;
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//cout << " freq = " << t.get_freq() << endl;
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//cout << " range = " << t.get_range() << endl;
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groundlist[g.get_freq()].push_back(g);
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in >> skipcomment;
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}
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return true;
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}
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// query the database for the specified frequency, lon and lat are in
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// degrees, elev is in meters
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bool FGGroundList::query( double lon, double lat, double elev, double freq,
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FGGround *g )
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{
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lon *= SGD_DEGREES_TO_RADIANS;
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lat *= SGD_DEGREES_TO_RADIANS;
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//cout << "lon = " << lon << '\n';
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//cout << "lat = " << lat << '\n';
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//cout << "elev = " << elev << '\n';
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//cout << "freq = " << freq << '\n';
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ground_list_type stations = groundlist[(int)(freq*100.0 + 0.5)];
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ground_list_iterator current = stations.begin();
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ground_list_iterator last = stations.end();
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// double az1, az2, s;
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Point3D aircraft = sgGeodToCart( Point3D(lon, lat, elev) );
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Point3D station;
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double d;
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for ( ; current != last ; ++current ) {
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//cout << "testing " << current->GetIdent() << endl;
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station = Point3D(current->get_x(), current->get_y(), current->get_z());
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//cout << "aircraft = " << aircraft << endl;
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//cout << "station = " << station << endl;
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d = aircraft.distance3Dsquared( station );
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//cout << " dist = " << sqrt(d)
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// << " range = " << current->get_range() * SG_NM_TO_METER << endl;
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// match up to twice the published range so we can model
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// reduced signal strength
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if ( d < (2 * current->get_range() * SG_NM_TO_METER
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* 2 * current->get_range() * SG_NM_TO_METER ) ) {
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//cout << "matched = " << current->GetIdent() << endl;
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*g = *current;
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return true;
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}
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}
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return false;
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}
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