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flightgear/src/Airports/runwaybase.hxx

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// runwaybase.hxx -- represent a runway or taxiway
//
// Written by James Turner, started December 2000.
//
// Copyright (C) 2000 Curtis L. Olson - http://www.flightgear.org/~curt
//
// 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_RUNWAY_BASE_HXX
#define _FG_RUNWAY_BASE_HXX
#include <simgear/compiler.h>
#include <simgear/math/sg_geodesy.hxx>
#include <Navaids/positioned.hxx>
#include <string>
/**
* @class The base class for runways and taxiways. At present, FGTaxiway is
* a direct instantiation of this class.
*/
class FGRunwayBase : public FGPositioned
{
public:
FGRunwayBase(PositionedID aGuid, Type aTy, const std::string& aIdent,
const SGGeod& aGeod,
const double heading, const double length,
const double width,
const int surface_code);
/**
* Retrieve a position on the extended centerline. Positive values
* are in the direction of the runway heading, negative values are in the
* opposited direction. 0.0 corresponds to the (non-displaced) threshold
*/
SGGeod pointOnCenterline(double aOffset) const;
SGGeod pointOffCenterline(double aOffset, double lateralOffset) const;
double lengthFt() const
{ return _length * SG_METER_TO_FEET; }
double lengthM() const
{ return _length; }
double widthFt() const
{ return _width * SG_METER_TO_FEET; }
double widthM() const
{ return _width; }
/**
* Runway heading in degrees.
*/
double headingDeg() const
{ return _heading; }
/**
* Predicate to test if this runway has a hard surface. For the moment, this
* means concrete or asphalt
*/
bool isHardSurface() const;
/**
* Retrieve runway surface code, as define in Robin Peel's data
*/
int surface() const
{ return _surface_code; }
protected:
double _heading;
double _length;
double _width;
/** surface, as defined by:
* http://www.x-plane.org/home/robinp/Apt810.htm#RwySfcCodes
*/
int _surface_code;
};
// for the moment, taxiways are simply a concrete RunwayBase
class FGTaxiway : public FGRunwayBase
{
public:
FGTaxiway(PositionedID aGuid,
const std::string& aIdent,
const SGGeod& aGeod,
const double heading, const double length,
const double width,
const int surface_code);
};
#endif // _FG_RUNWAY_BASE_HXX