/* 
   constants.h

   Ensure that required constants are defined
   (Insurance against flaky installations)

   $Revision: 1.1 $  $Date: 2013/08/09 08:14:15 $

*/

#ifndef M_PI 
#define M_PI 3.141592653589793
#endif
#ifndef M_PI_2 
#define M_PI_2 1.570796326794897
#endif
#ifndef M_2_PI 
#define M_2_PI (2.0/M_PI)
#endif
#ifndef M_2PI 
#define M_2PI 6.283185307179586
#endif