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when searching for the runway best matching a target heading, also consider

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the runway length/width/surface material, so that fgfs doesn't drop one on
the ridiculous grass stripe parallel to the grown up concrete runway
(LOWL, LOXZ, ...). The weighting factors are for now made configurable,
so that they are easier to adjust. This can later be made static.
(will soon get forward ported to fg/osg)
This commit is contained in:
mfranz 2007-10-04 17:11:19 +00:00
parent 5986ddc6d6
commit d20db83c86
1 changed files with 68 additions and 53 deletions
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121
src/Airports/runways.cxx
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@ -216,63 +216,78 @@ bool FGRunwayList::search( const string& aptid, const int tgt_hdg,
// Return the runway number of the runway closest to a given heading
string FGRunwayList::search( const string& aptid, const int tgt_hdg ) {
FGRunway r;
FGRunway tmp_r;
string rn;
double found_dir = 0.0;
#include <Main/fg_props.hxx> // FIXME remove
string FGRunwayList::search( const string& aptid, const int hdg ) {
//SG_LOG(SG_GENERAL, SG_DEBUG, "searching runway for " << aptid
// << " with target heading " << hdg);
if ( !search( aptid, &tmp_r ) ) {
SG_LOG( SG_GENERAL, SG_ALERT,
"Failed to find " << aptid << " in database." );
return "NN";
FGRunway r;
if (!search(aptid, &r)) {
SG_LOG(SG_GENERAL, SG_ALERT, "Failed to find "
<< aptid << " in database.");
return "NN";
}
double diff;
double min_diff = 360.0;
while ( tmp_r._id == aptid ) {
// forward direction
diff = tgt_hdg - tmp_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 " << tmp_r._rwy_no << " heading = "
// << tmp_r._heading << " diff = " << diff );
if ((diff < min_diff) && (tmp_r._type == "runway")) {
min_diff = diff;
r = tmp_r;
found_dir = 0;
}
// reverse direction
diff = tgt_hdg - tmp_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 -" << tmp_r._rwy_no << " heading = " <<
// tmp_r._heading + 180.0 <<
// " diff = " << diff );
if ((diff < min_diff) && (tmp_r._type == "runway")) {
min_diff = diff;
r = tmp_r;
found_dir = 180.0;
}
if (!next( &tmp_r ))
double LENWGT = fgGetDouble("/tmp/runway-search/length", 0.01);
double WIDWGT = fgGetDouble("/tmp/runway-search/width", 0.01);
double SURFWGT = fgGetDouble("/tmp/runway-search/surface", 10);
double DEVWGT = fgGetDouble("/tmp/runway-search/deviation", 1);
FGRunway best;
double max = 0.0;
bool reversed = false;
while (r._id == aptid) {
if (r._type != "runway")
continue;
int surface = 0;
if (r._surface_code == 1 || r._surface_code == 2) // asphalt & concrete
surface = 2;
else if (r._surface_code == 12 || r._surface_code == 5) // dry lakebed & gravel
surface = 1;
double quality, bad, diff;
double good = LENWGT * r._length + WIDWGT * r._width + SURFWGT * surface;
// this side
diff = hdg - r._heading;
while (diff < -180)
diff += 360;
while (diff >= 180)
diff -= 360;
bad = DEVWGT * fabs(diff) + 1e-20;
quality = good / bad;
//SG_LOG(SG_GENERAL, SG_DEBUG, " runway " << r._rwy_no << " -> " << quality);
if (quality > max) {
max = quality;
best = r;
reversed = false;
}
// other side
diff = hdg - r._heading - 180;
while (diff < -180)
diff += 360;
while (diff >= 180)
diff -= 360;
bad = DEVWGT * fabs(diff) + 1e-20;
quality = good / bad;
//SG_LOG(SG_GENERAL, SG_DEBUG, " runway " << GetReverseRunwayNo(r._rwy_no)
// << " -> " << quality);
if (quality > max) {
max = quality;
best = r;
reversed = true;
}
if (!next(&r))
break;
}
// SG_LOG( SG_GENERAL, SG_INFO, "closest runway = " << r._rwy_no
// << " + " << found_dir );
rn = r._rwy_no;
if ( found_dir == 180 ) {
rn = GetReverseRunwayNo(rn);
}
return rn;
return reversed ? GetReverseRunwayNo(best._rwy_no) : best._rwy_no;
}