61f2b98e8f
Compute gravitational acceleration based on the formula of Somigliana corrected for altitude and provide the value in property /environment/gravitational-acceleration-mps2
43 lines
1.2 KiB
C++
43 lines
1.2 KiB
C++
// gravity.hxx -- interface for earth gravitational model
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//
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// Written by Torsten Dreyer, June 2011
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//
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// Copyright (C) 2011 Torsten Dreyer - torsten (at) t3r _dot_ de
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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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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//
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#ifndef __GRAVITY_HXX
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#define __GRAVITY_HXX
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#include <simgear/math/SGMath.hxx>
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namespace Environment {
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class Gravity
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{
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public:
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virtual ~Gravity();
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virtual double getGravity( const SGGeod & position ) const = 0;
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const static Gravity * instance();
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private:
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static Gravity * _instance;
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};
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} // namespace
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#endif // __GRAVITY_HXX
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