1 // runways.cxx -- a simple class to manage airport runway info
3 // Written by Curtis Olson, started August 2000.
5 // Copyright (C) 2000 Curtis L. Olson - curt@flightgear.org
7 // This program is free software; you can redistribute it and/or
8 // modify it under the terms of the GNU General Public License as
9 // published by the Free Software Foundation; either version 2 of the
10 // License, or (at your option) any later version.
12 // This program is distributed in the hope that it will be useful, but
13 // WITHOUT ANY WARRANTY; without even the implied warranty of
14 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 // General Public License for more details.
17 // You should have received a copy of the GNU General Public License
18 // along with this program; if not, write to the Free Software
19 // Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
28 #include <math.h> // fabs()
29 #include <stdio.h> // sprintf()
31 #include <simgear/compiler.h>
33 #include <simgear/debug/logstream.hxx>
34 #include <simgear/misc/sgstream.hxx>
40 #include "runways.hxx"
42 SG_USING_NAMESPACE(std);
43 SG_USING_STD(istream);
44 SG_USING_STD(multimap);
47 operator >> ( istream& in, FGRunway& a )
53 if ( a.type == "R" ) {
54 in >> a.id >> a.rwy_no >> a.lat >> a.lon >> a.heading
55 >> a.length >> a.width >> a.surface_flags >> a.end1_flags
56 >> tmp >> tmp >> a.end2_flags >> tmp >> tmp;
57 } else if ( a.type == "T" ) {
58 // in >> a.id >> a.rwy_no >> a.lat >> a.lon >> a.heading
59 // >> a.length >> a.width >> a.surface_flags;
69 FGRunwayList::FGRunwayList( const string& file ) {
70 SG_LOG( SG_GENERAL, SG_DEBUG, "Reading runway list: " << file );
72 // open the specified file for reading
73 sg_gzifstream in( file );
74 if ( !in.is_open() ) {
75 SG_LOG( SG_GENERAL, SG_ALERT, "Cannot open file: " << file );
85 runways.insert(pair<const string, FGRunway>(rwy.id, rwy));
90 // Return reverse rwy number
93 static string GetReverseRunwayNo(string rwyno) {
94 // cout << "Original rwyno = " << rwyNo << '\n';
96 // standardize input number
97 string tmp = rwyno.substr(1, 1);
98 if (( tmp == "L" || tmp == "R" || tmp == "C" ) || (rwyno.size() == 1)) {
101 SG_LOG( SG_GENERAL, SG_INFO, "Standardising rwy number from " << tmp
102 << " to " << rwyno );
106 int rn = atoi(rwyno.substr(0,2).c_str());
111 sprintf(buf, "%02i", rn);
112 if(rwyno.size() == 3) {
113 if(rwyno.substr(2,1) == "L") {
116 } else if (rwyno.substr(2,1) == "R") {
119 } else if (rwyno.substr(2,1) == "C") {
123 SG_LOG(SG_GENERAL, SG_ALERT, "Unknown runway code "
124 << rwyno << " passed to GetReverseRunwayNo(...)");
131 // search for the specified apt id (wierd!)
132 bool FGRunwayList::search( const string& aptid, FGRunway* r ) {
133 runway_map_iterator pos;
135 pos = runways.lower_bound(aptid);
136 if ( pos != runways.end() ) {
146 // search for the specified apt id and runway no
147 bool FGRunwayList::search( const string& aptid, const string& rwyno,
150 // standardize input number
151 string runwayno = rwyno;
152 string tmp = runwayno.substr(1, 1);
153 if (( tmp == "L" || tmp == "R" || tmp == "C" ) || (runwayno.size() == 1)) {
155 runwayno = "0" + tmp;
156 SG_LOG( SG_GENERAL, SG_INFO,
157 "Standardising rwy number from " << tmp << " to " << runwayno );
159 string revrwyno = GetReverseRunwayNo(runwayno);
161 runway_map_iterator pos;
162 for ( pos = runways.lower_bound( aptid );
163 pos != runways.upper_bound( aptid ); ++pos)
165 if ( pos->second.rwy_no == runwayno ) {
169 } else if ( pos->second.rwy_no == revrwyno ) {
170 // Search again with the other-end runway number.
171 // Remember we have to munge the heading and rwy_no
172 // results if this one matches
175 r->rwy_no = revrwyno;
177 string tmp = r->end1_flags;
178 r->end1_flags = r->end2_flags;
189 FGRunway FGRunwayList::search( const string& aptid ) {
196 // Return the runway closest to a given heading
197 bool FGRunwayList::search( const string& aptid, const int tgt_hdg,
200 string rwyNo = search(aptid, tgt_hdg);
201 return(rwyNo == "NN" ? false : search(aptid, rwyNo, runway));
205 // Return the runway number of the runway closest to a given heading
206 string FGRunwayList::search( const string& aptid, const int tgt_hdg ) {
210 double found_dir = 0.0;
212 if ( !search( aptid, &tmp_r ) ) {
213 SG_LOG( SG_GENERAL, SG_ALERT,
214 "Failed to find " << aptid << " in database." );
219 double min_diff = 360.0;
221 while ( tmp_r.id == aptid ) {
225 diff = tgt_hdg - r.heading;
226 while ( diff < -180.0 ) { diff += 360.0; }
227 while ( diff > 180.0 ) { diff -= 360.0; }
229 // SG_LOG( SG_GENERAL, SG_INFO,
230 // "Runway " << r.rwy_no << " heading = " << r.heading <<
231 // " diff = " << diff );
232 if ( diff < min_diff ) {
239 diff = tgt_hdg - r.heading - 180.0;
240 while ( diff < -180.0 ) { diff += 360.0; }
241 while ( diff > 180.0 ) { diff -= 360.0; }
243 // SG_LOG( SG_GENERAL, SG_INFO,
244 // "Runway -" << r.rwy_no << " heading = " <<
245 // r.heading + 180.0 <<
246 // " diff = " << diff );
247 if ( diff < min_diff ) {
256 // SG_LOG( SG_GENERAL, SG_INFO, "closest runway = " << r.rwy_no
257 // << " + " << found_dir );
259 // cout << "In search, rn = " << rn << endl;
260 if ( found_dir == 180 ) {
261 rn = GetReverseRunwayNo(rn);
262 //cout << "New rn = " << rn << '\n';
269 bool FGRunwayList::next( FGRunway* runway ) {
271 if ( current != runways.end() ) {
272 *runway = current->second;
280 FGRunway FGRunwayList::next() {
284 if ( current != runways.end() ) {
285 result = current->second;
293 FGRunwayList::~FGRunwayList( void ) {