vglobal.h

/* This file is part of the KDE project
   Copyright (C) 2001, The Karbon Developers
   Copyright (C) 2002, The Karbon Developers
 
   This library is free software; you can redistribute it and/or
   modify it under the terms of the GNU Library General Public
   License as published by the Free Software Foundation; either
   version 2 of the License, or (at your option) any later version.
 
   This library 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
   Library General Public License for more details.
 
   You should have received a copy of the GNU Library General Public License
   along with this library; see the file COPYING.LIB.  If not, write to
   the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
 * Boston, MA 02110-1301, USA.
*/
 
#ifndef __VGLOBAL_H__
#define __VGLOBAL_H__
 
#include <tdeglobal.h>
 
// define some often used mathematical constants et al:
 
// TODO: optimize those values.
 
namespace VGlobal
{
    const double pi         =  3.14159265358979323846;  // pi
    const double twopi      =  6.28318530717958647692;  // 2pi
    const double pi_2       =  1.57079632679489661923;  // pi/2
    const double pi_180     =  0.01745329251994329576;  // pi/180
    const double one_pi_180 = 57.29577951308232087684;  // 180/pi
    const double sqrt2      =  1.41421356237309504880;  // sqrt(2)
    const double one_3      =  0.33333333333333333333;  // 1/3
    const double two_3      =  0.66666666666666666667;  // 2/3
    const double one_6      =  0.16666666666666666667;  // 1/6
    const double one_7      =  0.14285714285714285714;  // 1/7

    const double veryBigNumber = 1.0e8;
    const double verySmallNumber = 1.0e-8;

    const double flatnessTolerance = 0.01;

    const double lengthTolerance = 0.005;

    const double paramLengthTolerance = 0.001;

    const double isNearRange = 0.001;

    const double parallelTolerance = 0.99;

    inline int sign( double a )
    {
        return a < 0.0
               ? -1
               : 1;
    }

    int binomialCoeff( unsigned n, unsigned k );

    double factorialLn( unsigned n );

    double gammaLn( double x );
}
 
#endif