/*
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