71 lines
2.4 KiB
C++
71 lines
2.4 KiB
C++
// ATCProjection.hxx - A convienience projection class for the ATC/AI system.
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//
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// Written by David Luff, started 2002.
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//
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// Copyright (C) 2002 David C Luff - david.luff@nottingham.ac.uk
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//
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// This program is free software; you can redistribute it and/or
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// modify it under the terms of the GNU General Public License as
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// published by the Free Software Foundation; either version 2 of the
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// License, or (at your option) any later version.
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//
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// This program is distributed in the hope that it will be useful, but
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// WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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// General Public License for more details.
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//
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// You should have received a copy of the GNU General Public License
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// along with this program; if not, write to the Free Software
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// Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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#ifndef _FG_ATC_PROJECTION_HXX
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#define _FG_ATC_PROJECTION_HXX
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#include <simgear/math/point3d.hxx>
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// FGATCProjection - a class to project an area local to an airport onto an orthogonal co-ordinate system
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class FGATCProjection {
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public:
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FGATCProjection();
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~FGATCProjection();
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void Init(Point3D centre);
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// Convert a lat/lon co-ordinate to the local projection
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Point3D ConvertToLocal(Point3D pt);
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// Convert a local projection co-ordinate to lat/lon
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Point3D ConvertFromLocal(Point3D pt);
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private:
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Point3D origin; // lat/lon of local area origin
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double correction_factor; // Reduction in surface distance per degree of longitude due to latitude. Saves having to do a cos() every call.
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};
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// FGATCAlignedProjection - a class to project an area local to a runway onto an orthogonal co-ordinate system
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// with the origin at the threshold and the runway aligned with the y axis.
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class FGATCAlignedProjection {
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public:
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FGATCAlignedProjection();
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~FGATCAlignedProjection();
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void Init(Point3D centre, double heading);
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// Convert a lat/lon co-ordinate to the local projection
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Point3D ConvertToLocal(Point3D pt);
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// Convert a local projection co-ordinate to lat/lon
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Point3D ConvertFromLocal(Point3D pt);
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private:
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Point3D origin; // lat/lon of local area origin (the threshold)
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double theta; // the rotation angle for alignment in radians
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double correction_factor; // Reduction in surface distance per degree of longitude due to latitude. Saves having to do a cos() every call.
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};
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#endif // _FG_ATC_PROJECTION_HXX
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