real.h

Go to the documentation of this file.

/*
    Sheep - A Rigid Body Dynamics Engine
    Copyright (C) 2001-2004 Francois Beaune
    Contact: http://toxicengine.sourceforge.net/

    This file is part of Sheep.

    Sheep 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.

    Sheep 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 Sheep; if not, write to the Free Software
    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
*/

#ifndef SHEEP_MATH_REAL_H
#define SHEEP_MATH_REAL_H

#include "common/misc/config.h"

#include <cassert>
#include <cmath>

namespace sheep {

    //typedef float Real;
    typedef double Real;

    const Real EPS = 1.0e-8;

    //! Used to test two floating point numbers to see if they are close
    //! enough to be considered equal (not equal, less or equal, greater
    //! or equal, zero, not zero). Based on code by Robert Martin
    //! (rmartin@rcmcon.com).
    bool feq(Real a, Real b, Real e = EPS);     //!< Equal: a == b.
    bool fneq(Real a, Real b, Real e = EPS);    //!< Not equal: a != b.
    bool fle(Real a, Real b, Real e = EPS);     //!< Less or equal: a <= b.
    bool fge(Real a, Real b, Real e = EPS);     //!< Greater or equal: a >= b.
    bool fz(Real a, Real e = EPS);              //!< Zero: a == 0.
    bool fnz(Real a, Real e = EPS);             //!< Not zero: a != 0.

    template<typename T>
    T sq(T x);

    const Real PI = 3.1415926535897932;

    //! Degrees to radians and radians to degrees conversion functions.
    Real dtor(Real d);  //!< Convert degrees to radians.
    Real rtod(Real r);  //!< Convert radians to degrees.

    //! Expresses a given angle to [0, 2*Pi]. The input and output angles are
    //! expressed in radians.
    Real NormalizeAngle(Real angle);

    //! Returns the smallest integer which can be expressed as a power of two,
    //! and which is greatest than x. x must be >= 1.
    int NextPowerOfTwo(double x);

#include "real.inl"

}

#endif  // !SHEEP_MATH_REAL_H

---