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flightgear/src/Navaids/positioned.hxx

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// positioned.hxx - base class for objects which are positioned
//
// Copyright (C) 2008 James Turner
//
// This program is free software; you can redistribute it and/or
// modify it under the terms of the GNU General Public License as
// published by the Free Software Foundation; either version 2 of the
// License, or (at your option) any later version.
//
// This program is distributed in the hope that it will be useful, but
// WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
// General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with this program; if not, write to the Free Software
// Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
//
// $Id$
#ifndef FG_POSITIONED_HXX
#define FG_POSITIONED_HXX
#include <vector>
#include <simgear/structure/SGSharedPtr.hxx>
#include <simgear/bucket/newbucket.hxx>
class FGPositioned;
typedef SGSharedPtr<FGPositioned> FGPositionedRef;
class FGPositioned : public SGReferenced
{
public:
typedef enum {
INVALID = 0,
AIRPORT,
HELIPORT,
SEAPORT,
RUNWAY,
TAXIWAY,
PARK_STAND,
FIX,
VOR,
NDB,
ILS,
LOC,
GS,
OM,
MM,
IM,
DME,
TACAN,
OBSTACLE,
WAYPOINT, // user-defined waypoint
FREQ_GND,
FREQ_TWR,
FREQ_ATIS,
LAST_TYPE
} Type;
typedef std::vector<FGPositionedRef> List;
virtual ~FGPositioned();
Type type() const
{ return mType; }
const std::string& ident() const
{ return mIdent; }
const SGGeod& geod() const
{ return mPosition; }
SGBucket bucket() const;
double latitude() const
{ return mPosition.getLatitudeDeg(); }
double longitude() const
{ return mPosition.getLongitudeDeg(); }
double elevation() const
{ return mPosition.getElevationFt(); }
/**
* Predicate class to support custom filtering of FGPositioned queries
*/
class Filter
{
public:
virtual ~Filter() { ; }
virtual bool pass(FGPositioned* aPos) const = 0;
bool operator()(FGPositioned* aPos) const
{ return pass(aPos); }
};
static List findWithinRange(const SGGeod& aPos, double aRangeNm, const Filter& aFilter);
static List findWithinRangeByType(const SGGeod& aPos, double aRangeNm, Type aTy);
static FGPositionedRef findClosestWithIdent(const std::string& aIdent, double aLat, double aLon);
static FGPositionedRef findClosestWithIdent(const std::string& aIdent, const SGGeod& aPos);
static List findAllWithIdent(const std::string& aIdent);
/**
* Find the closest N items to a position, which pass the specified filter
* A cutoff range in NM must be specified, to constrain the search acceptably.
* Very large cutoff values will make this slow.
*
* @result The matches (possibly less than N, depending on the filter and cutoff),
* sorted by distance from the search pos
* @param aN - number of matches to find
* @param aCutoffNm - maximum distance to search within, in nautical miles
*/
static List findClosestN(const SGGeod& aPos, unsigned int aN, double aCutoffNm, const Filter& aFilter);
/**
* Debug helper, map a type to a human-readable string
*/
static const char* nameForType(Type aTy);
protected:
FGPositioned(Type ty, const std::string& aIdent, double aLat, double aLon, double aElev);
FGPositioned(Type ty, const std::string& aIdent, const SGGeod& aPos);
SGGeod mPosition; // can't be const right now
Type mType;
std::string mIdent;
};
#endif // of FG_POSITIONED_HXX