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flightgear/src/Airports/runways.hxx

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2000-08-16 01:28:33 +00:00
// runways.hxx -- a simple class to manage airport runway info
//
// Written by Curtis Olson, started August 2000.
//
// Copyright (C) 2000 Curtis L. Olson - http://www.flightgear.org/~curt
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//
// 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
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// Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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//
// $Id$
#ifndef _FG_RUNWAYS_HXX
#define _FG_RUNWAYS_HXX
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#include <simgear/compiler.h>
#include <simgear/math/sg_geodesy.hxx>
#include "Navaids/positioned.hxx"
#include <string>
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// forward decls
class FGAirport;
class FGRunway : public FGPositioned
{
FGAirport* _airport; ///< owning airport
bool _reciprocal;
public:
FGRunway(FGAirport* aAirport, const std::string& rwy_no,
const double longitude, const double latitude,
const double heading, const double length,
const double width,
const double displ_thresh,
const double stopway,
const int surface_code,
const bool reciprocal);
/**
* given a runway identifier (06, 18L, 31R) compute the identifier for the
* reciprocal heading runway (24, 36R, 13L) string.
*/
static std::string reverseIdent(const std::string& aRunayIdent);
/**
* score this runway according to the specified weights. Used by
* FGAirport::findBestRunwayForHeading
*/
double score(double aLengthWt, double aWidthWt, double aSurfaceWt) const;
/**
* Test if this runway is the reciprocal. This allows users who iterate
* over runways to avoid counting runways twice, if desired.
*/
bool isReciprocal() const
{ return _reciprocal; }
/**
* Test if this is a taxiway or not
*/
bool isTaxiway() const;
/**
* Get the runway threshold point - this is syntatic sugar, equivalent to
* calling pointOnCenterline(0.0);
*/
SGGeod threshold() const;
/**
* Get the (possibly displaced) threshold point.
*/
SGGeod displacedThreshold() const;
/**
* Get the opposite threshold - this is equivalent to calling
* pointOnCenterline(lengthFt());
*/
SGGeod reverseThreshold() const;
/**
* Retrieve a position on the extended runway 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;
/**
* Runway length in ft
*/
double lengthFt() const
{ return _length; }
double lengthM() const
{ return _length * SG_FEET_TO_METER; }
double widthFt() const
{ return _width; }
double widthM() const
{ return _width * SG_FEET_TO_METER; }
/**
* Runway heading in degrees.
*/
double headingDeg() const
{ return _heading; }
/**
* Airport this runway is located at
*/
FGAirport* airport() const
{ return _airport; }
// FIXME - should die once airport / runway creation is cleaned up
void setAirport(FGAirport* aAirport)
{ _airport = aAirport; }
std::string _rwy_no;
double _lon;
double _lat;
double _displ_thresh;
double _stopway;
double _heading;
double _length;
double _width;
int _surface_code;
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};
#endif // _FG_RUNWAYS_HXX