angles.h

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#ifndef _ANGLES_H
#define _ANGLES_H

#include <cmath>

//##########################################################
// THE ANGLE DEFINITIONS
//##########################################################
#ifndef M_PI
#define M_PI 3.1415926535897932384626433832795
#endif

inline double angle0To2Pi (double angle)
{
#if 0  
  while (angle >= M_PI*2)
    angle -= M_PI*2;
  while (angle < 0)
    angle += M_PI*2;
  return angle;
#else
  if (angle>2*M_PI)
      return  fmod (angle,M_PI*2);
   else if (angle < 0)
      return (2*M_PI+ fmod (angle,M_PI*2));
   else return angle;
#endif
}

inline double CCW (double reference, double angle1)
{
   double fangle1 = angle0To2Pi(angle1);
   double fref = angle0To2Pi(reference);

   if (fref > fangle1){
    return angle0To2Pi(2*M_PI - (fref - fangle1));
  }
   else
      return angle0To2Pi(fangle1 - fref); 
}

#endif