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////////////////////////////////////////////////////////////////////////////////
// matrix.h
// Creation : 20/01/2000
// Author   : Leonardo FLOREZ VALENCIA
//               l-florez@uniandes.edu.co
//               lflorez@creatis.insa-lyon.fr
// Copyright (C) 2000-2002 Leonardo FLOREZ VALENCIA
//
// 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., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
////////////////////////////////////////////////////////////////////////////////

#ifndef GTMLIB__MATH__MATHDEFS__HXX
#define GTMLIB__MATH__MATHDEFS__HXX

#include <math.h>

/// PI constant.
#define GTM_PI  3.14159265359
/// 2 * PI constant.
#define GTM_PI2 6.28318530717
/// ln1 constant.
#define GTM_NE  2.71828182846

/// Minimum.
#define GTM_MIN( a, b ) ( ( ( a ) < ( b ) )? ( a ): ( b ) )
/// Maximum.
#define GTM_MAX( a, b ) ( ( ( a ) > ( b ) )? ( a ): ( b ) )
#define GTM_POW2( a ) ( ( a ) * ( a ) )

// Useful typedefs. // Useless now // JPR
/*
typedef unsigned char  uchar;
typedef unsigned short ushort;
typedef unsigned int   uint;
*/

namespace gtm
{
    /** Rounds a double number.
     *
     *  @param n Number.
     */
    inline
    double round( double n )
    {
	double tmp;
	tmp = floor( n );
	if ( ( n - tmp ) < 0.5 )
	    return( tmp );
	else
	    return( ceil( n ) );
    }
}

#endif // GTMLIB__MATH__MATHDEFS__HXX

// EOF - mathdefs.h