73 lines
2.7 KiB
C++
73 lines
2.7 KiB
C++
// ATCProjection.hxx - A convienience projection class for the ATC/AI system.
|
|
//
|
|
// Written by David Luff, started 2002.
|
|
//
|
|
// Copyright (C) 2002 David C Luff - david.luff@nottingham.ac.uk
|
|
//
|
|
// 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.
|
|
|
|
#ifndef _FG_ATC_PROJECTION_HXX
|
|
#define _FG_ATC_PROJECTION_HXX
|
|
|
|
#include <simgear/math/point3d.hxx>
|
|
|
|
// FGATCProjection - a class to project an area local to an airport onto an orthogonal co-ordinate system
|
|
class FGATCProjection {
|
|
|
|
public:
|
|
FGATCProjection();
|
|
FGATCProjection(const Point3D& centre);
|
|
~FGATCProjection();
|
|
|
|
void Init(const Point3D& centre);
|
|
|
|
// Convert a lat/lon co-ordinate (degrees) to the local projection (meters)
|
|
Point3D ConvertToLocal(const Point3D& pt);
|
|
|
|
// Convert a local projection co-ordinate (meters) to lat/lon (degrees)
|
|
Point3D ConvertFromLocal(const Point3D& pt);
|
|
|
|
private:
|
|
Point3D _origin; // lat/lon of local area origin
|
|
double _correction_factor; // Reduction in surface distance per degree of longitude due to latitude. Saves having to do a cos() every call.
|
|
|
|
};
|
|
|
|
|
|
// FGATCAlignedProjection - a class to project an area local to a runway onto an orthogonal co-ordinate system
|
|
// with the origin at the threshold and the runway aligned with the y axis.
|
|
class FGATCAlignedProjection {
|
|
|
|
public:
|
|
FGATCAlignedProjection();
|
|
FGATCAlignedProjection(const Point3D& centre, double heading);
|
|
~FGATCAlignedProjection();
|
|
|
|
void Init(const Point3D& centre, double heading);
|
|
|
|
// Convert a lat/lon co-ordinate (degrees) to the local projection (meters)
|
|
Point3D ConvertToLocal(const Point3D& pt);
|
|
|
|
// Convert a local projection co-ordinate (meters) to lat/lon (degrees)
|
|
Point3D ConvertFromLocal(const Point3D& pt);
|
|
|
|
private:
|
|
Point3D _origin; // lat/lon of local area origin (the threshold)
|
|
double _theta; // the rotation angle for alignment in radians
|
|
double _correction_factor; // Reduction in surface distance per degree of longitude due to latitude. Saves having to do a cos() every call.
|
|
|
|
};
|
|
|
|
#endif // _FG_ATC_PROJECTION_HXX
|