Make FGRunway track reciprocal runways.

src/Airports/apt_loader.cxx

@@ -286,6 +286,9 @@ private:
                 displ_thresh2, stopway2, surface_code, true);
 
       runways.push_back(reciprocal);
+      
+      rwy->setReciprocalRunway(reciprocal);
+      reciprocal->setReciprocalRunway(rwy);
     }
   }
 
@@ -335,6 +338,9 @@ private:
               pos, heading_2, length, width, 
               displ_thresh2, stopway2, surface_code, true);
     runways.push_back(reciprocal);
+    
+    rwy->setReciprocalRunway(reciprocal);
+    reciprocal->setReciprocalRunway(rwy);
   }
 
   void parseWaterRunwayLine850(const vector<string>& token)
@@ -373,6 +379,9 @@ private:
               pos, heading_2, length, width, 
               0.0, 0.0, 13, true);
     runways.push_back(reciprocal);
+    
+    rwy->setReciprocalRunway(reciprocal);
+    reciprocal->setReciprocalRunway(rwy);
   }
 
   void parseHelipadLine850(const vector<string>& token)

src/Airports/runways.cxx

@@ -71,7 +71,8 @@ FGRunway::FGRunway(FGAirport* aAirport, const string& aIdent,
                         bool reciprocal) :
   FGRunwayBase(RUNWAY, cleanRunwayNo(aIdent), aGeod, heading, length, width, surface_code, true),
   _airport(aAirport),
-  _reciprocal(reciprocal),
+  _isReciprocal(reciprocal),
+  _reciprocal(NULL),
   _displ_thresh(displ_thresh),
   _stopway(stopway),
   _ils(NULL)
@@ -158,3 +159,12 @@ void FGRunway::processThreshold(SGPropertyNode* aThreshold)
   SGGeodesy::direct(newThreshold, _heading, offsetFt * SG_FEET_TO_METER, newCenter, dummy);
   mPosition = newCenter;
 } 
+
+void FGRunway::setReciprocalRunway(FGRunway* other)
+{
+  assert(_reciprocal==NULL);
+  assert((other->_reciprocal == NULL) || (other->_reciprocal == this));
+  
+  _reciprocal = other;
+}
+

src/Airports/runways.hxx

@@ -36,7 +36,8 @@ class SGPropertyNode;
 class FGRunway : public FGRunwayBase
 {
   FGAirport* _airport;
-  bool _reciprocal;
+  bool _isReciprocal;
+  FGRunway* _reciprocal;
   double _displ_thresh;
   double _stopway;
   FGNavRecord* _ils;
@@ -68,7 +69,7 @@ public:
    * over runways to avoid counting runways twice, if desired.
    */
   bool isReciprocal() const
-  { return _reciprocal; }
+  { return _isReciprocal; }
 
   /**
    * Get the runway begining point - this is syntatic sugar, equivalent to
@@ -106,6 +107,10 @@ public:
   FGNavRecord* ILS() const { return _ils; }
   void setILS(FGNavRecord* nav) { _ils = nav; }
   
+  FGRunway* reciprocalRunway() const
+  { return _reciprocal; }
+  void setReciprocalRunway(FGRunway* other);
+  
   /**
    * Helper to process property data loaded from an ICAO.threshold.xml file
    */