/*%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

 Header:       FGGroundCallback.h
 Author:       Mathias Froehlich
 Date started: 05/21/04

 ------ Copyright (C) 2004 Mathias Froehlich (Mathias.Froehlich@web.de) -------

 This program is free software; you can redistribute it and/or modify it under
 the terms of the GNU Lesser 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 Lesser General Public License for more
 details.

 You should have received a copy of the GNU Lesser General Public License along with
 this program; if not, write to the Free Software Foundation, Inc., 59 Temple
 Place - Suite 330, Boston, MA  02111-1307, USA.

 Further information about the GNU Lesser General Public License can also be found on
 the world wide web at http://www.gnu.org.

HISTORY
-------------------------------------------------------------------------------
05/21/00   MF   Created

%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
SENTRY
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%*/

#ifndef FGGROUNDCALLBACK_H
#define FGGROUNDCALLBACK_H

/*%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
INCLUDES
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#include <math/FGColumnVector3.h>
#include <math/FGLocation.h>

/*%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
DEFINITIONS
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#define ID_GROUNDCALLBACK "$Id$"

namespace JSBSim {

/*%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
CLASS DOCUMENTATION
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/** This class provides callback slots to get ground specific data like
    ground elevation and such.
    There is a default implementation, which returns values for a
    ball formed earth.

    @author Mathias Froehlich
    @version $Id$
*/

/*%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
CLASS DECLARATION
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%*/

class FGGroundCallback : public FGJSBBase
{
public:
  /** Default constructor.
  Within this constructor, the reference radius is set to the WGS84 equatorial
  radius. This constructor should really not be called, instead relying on the 
  constructor that takes reference radius as an argument. */
  FGGroundCallback();

  /** Constructor
  This constructor accepts the reference radius in feet. This is the preferred  
  constructor. */
  FGGroundCallback(double ReferenceRadius);
  virtual ~FGGroundCallback();

  /** Compute the altitude above sealevel. */
  virtual double GetAltitude(const FGLocation& l) const;
  /** Compute the altitude above ground. Defaults to sealevel altitude. */
  virtual double GetAGLevel(double t, const FGLocation& l, FGLocation& cont,
                            FGColumnVector3& n, FGColumnVector3& v) const;
  virtual void SetTerrainGeoCentRadius(double radius) {mReferenceRadius = radius;}
  virtual double GetTerrainGeoCentRadius(void) const {return mReferenceRadius;}
private:
  /// Reference radius.
  double mReferenceRadius;
};

}
//%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
#endif