Merge branch 'jsd/atmos' into topic/atmos-merge

[flightgear.git] / src / Navaids / navrecord.cxx

diff --git a/src/Navaids/navrecord.cxx b/src/Navaids/navrecord.cxx
index 0695010cdf60df96e30b9a8dface8928f290f63f..2029d2b7d3e004a2aa10c6b4c0de1432251f6741 100644 (file)
--- a/src/Navaids/navrecord.cxx
+++ b/src/Navaids/navrecord.cxx
@@ -27,12 +27,19 @@
 #include <istream>
 
 #include <simgear/misc/sgstream.hxx>
+#include <simgear/misc/sg_path.hxx>
 #include <simgear/structure/exception.hxx>
 #include <simgear/debug/logstream.hxx>
+#include <simgear/sg_inlines.h>
+#include <simgear/props/props.hxx>
+#include <simgear/props/props_io.hxx>
 
 #include <Navaids/navrecord.hxx>
 #include <Navaids/navdb.hxx>
 #include <Airports/runways.hxx>
+#include <Airports/simple.hxx>
+#include <Airports/xmlloader.hxx>
+
 #include <Main/fg_props.hxx>
 
 FGNavRecord::FGNavRecord(Type aTy, const std::string& aIdent, 
@@ -43,6 +50,7 @@ FGNavRecord::FGNavRecord(Type aTy, const std::string& aIdent,
   range(aRange),
   multiuse(aMultiuse),
   _name(aName),
+  mRunway(NULL),
   serviceable(true),
   trans_ident(aIdent)
 { 
@@ -82,10 +90,19 @@ void FGNavRecord::initAirportRelation()
     return; // not airport-located
   }
   
-  FGRunway* runway = getRunwayFromName(_name);    
+  mRunway = getRunwayFromName(_name);  
+  
+  if (type() != GS) {
+    readAirportSceneryData();
+  }
+        
   // fudge elevation to the runway elevation if it's not specified
   if (fabs(elevation()) < 0.01) {
-    mPosition.setElevationFt(runway->elevation());
+    mPosition.setElevationFt(mRunway->elevation());
+  }
+  
+  if (type() == ILS) {
+    mRunway->setILS(this);
   }
   
   // align localizers with their runway
@@ -96,35 +113,68 @@ void FGNavRecord::initAirportRelation()
     
    double threshold 
      = fgGetDouble( "/sim/navdb/localizers/auto-align-threshold-deg", 5.0 );
-    alignLocaliserWithRunway(runway, threshold);
+    alignLocaliserWithRunway(threshold);
+  }
+}
+
+void FGNavRecord::readAirportSceneryData()
+{
+  // allow users to disable the scenery data in the short-term
+  // longer term, this option can probably disappear
+  if (!fgGetBool("/sim/use-scenery-airport-data")) {
+    return; 
   }
+  
+  SGPath path;
+  SGPropertyNode_ptr rootNode = new SGPropertyNode;
+  if (!XMLLoader::findAirportData(mRunway->airport()->ident(), "ils", path)) {
+    return;
+  }
+  
+  readProperties(path.str(), rootNode);
+  SGPropertyNode* runwayNode, *ilsNode;
+  for (int i=0; (runwayNode = rootNode->getChild("runway", i)) != NULL; ++i) {
+    for (int j=0; (ilsNode = runwayNode->getChild("ils", j)) != NULL; ++j) {
+      // must match on both nav-ident and runway ident, to support the following:
+      // - runways with multiple distinct ILS installations (KEWD, for example)
+      // - runways where both ends share the same nav ident (LFAT, for example)
+      if ((ilsNode->getStringValue("nav-id") == ident()) &&
+          (ilsNode->getStringValue("rwy") == mRunway->ident())) {
+        processSceneryILS(ilsNode);
+        return;
+      }
+    } // of ILS iteration
+  } // of runway iteration
 }
 
-void FGNavRecord::alignLocaliserWithRunway(FGRunway* aRunway, double aThreshold)
+void FGNavRecord::processSceneryILS(SGPropertyNode* aILSNode)
+{
+  double hdgDeg = aILSNode->getDoubleValue("hdg-deg"),
+    lon = aILSNode->getDoubleValue("lon"),
+    lat = aILSNode->getDoubleValue("lat"),
+    elevM = aILSNode->getDoubleValue("elev-m");
+    
+  mPosition = SGGeod::fromDegM(lon, lat, elevM);
+  multiuse = hdgDeg;
+}
+
+void FGNavRecord::alignLocaliserWithRunway(double aThreshold)
 {
 // find the distance from the threshold to the localizer
-  SGGeod runwayThreshold(aRunway->threshold());
-  double dist, az1, az2;
-  SGGeodesy::inverse(mPosition, runwayThreshold, az1, az2, dist);
+  double dist = SGGeodesy::distanceM(mPosition, mRunway->threshold());
 
 // back project that distance along the runway center line
-  SGGeod newPos = aRunway->pointOnCenterline(dist);
+  SGGeod newPos = mRunway->pointOnCenterline(dist);
 
-  double hdg_diff = get_multiuse() - aRunway->headingDeg();
-
-  // clamp to [-180.0 ... 180.0]
-  if ( hdg_diff < -180.0 ) {
-      hdg_diff += 360.0;
-  } else if ( hdg_diff > 180.0 ) {
-      hdg_diff -= 360.0;
-  }
+  double hdg_diff = get_multiuse() - mRunway->headingDeg();
+  SG_NORMALIZE_RANGE(hdg_diff, -180.0, 180.0);
 
   if ( fabs(hdg_diff) <= aThreshold ) {
-    mPosition = newPos;
-    set_multiuse( aRunway->headingDeg() );
+    mPosition = SGGeod::fromGeodFt(newPos, mPosition.getElevationFt());
+    set_multiuse( mRunway->headingDeg() );
   } else {
     SG_LOG(SG_GENERAL, SG_WARN, "localizer:" << ident() << ", aligning with runway " 
-      << aRunway->ident() << " exceeded heading threshold");
+      << mRunway->ident() << " exceeded heading threshold");
   }
 }