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/* ------------------------------------------------------------------------
* $Id: Math.hh,v 1.5 2001/08/16 11:32:20 elm Exp $
*
* This file is part of 3Dwm: The Three-Dimensional User Environment.
*
* 3Dwm: The Three-Dimensional User Environment:
* <http://www.3dwm.org>
*
* Chalmers Medialab
* <http://www.medialab.chalmers.se>
*
* ------------------------------------------------------------------------
* File created 1999-06-02 by Niklas Elmqvist.
*
* Copyright (c) 1999-2001 Niklas Elmqvist <elm@3dwm.org>.
* ------------------------------------------------------------------------
* This library 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 2.1 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
* USA
* ------------------------------------------------------------------------
*/
#ifndef _Math_hh_
#define _Math_hh_
// -- System Includes
#include <stdlib.h>
#include <math.h>
//#include <cmath>
// -- Namespaces
class Math {
public:
/// Machine precision (@@@Put some research into this!)
const static double tolerance = 1e-5;
const static double epsilon = tolerance;
// Value of pi
const static double pi = M_PI;
// Degree <-> radian conversion
const static double radians_per_degree = pi / 180.;
const static double degrees_per_radian = 180. / pi;
static double degToRad(double deg) { return deg * radians_per_degree; }
static double radToDeg(double rad) { return rad * degrees_per_radian; }
/// Absolute function
static float abs(float a) { return fabs(a); }
static double abs(double a) { return fabs(a); }
static int abs(int a) { return ::abs(a); }
static long abs(long a) { return ::labs(a); }
/// Equality function (with tolerance)
template <class T, class U> static bool equal(T a, U b, T e = tolerance) {
return a - b < e && b - a < e;
}
};
#endif /* Math.hh */
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