constants.hpp
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00001 
00008 /*****************************************************************************
00009 ** Ifdefs
00010 *****************************************************************************/
00011 
00012 #ifndef ECL_MATH_CONSTANTS_HPP_
00013 #define ECL_MATH_CONSTANTS_HPP_
00014 
00015 /*****************************************************************************
00016 ** Includes
00017 *****************************************************************************/
00018 
00019 #include <cmath>
00020 
00021 /*****************************************************************************
00022 ** Namespaces
00023 *****************************************************************************/
00024 
00025 namespace ecl {
00026 
00027 #ifdef M_PI // defined by all POSIX systems and some non-POSIX ones
00028         double const pi = M_PI; 
00029         const double two_pi  = 2.0*pi;  
00030         const double pi_2    = pi/2.0;  
00031         const double pi_4    = pi/4.0;  
00032         const float  two_pi_f= two_pi;  
00033         const float  pi_f    = pi;  
00034         const float  pi_2_f  = pi_2;  
00035         const float  pi_4_f  = pi_4;  
00036 #else
00037         double const pi = 4.0*std::atan(1.0); 
00038         const double two_pi  = 2.0*pi;  
00039         const double pi_2    = pi/2.0;  
00040         const double pi_4    = pi/4.0;  
00041         const float  two_pi_f= two_pi;  
00042         const float  pi_f    = pi;  
00043         const float  pi_2_f  = pi_2;  
00044         const float  pi_4_f  = pi_4;  
00045 #endif
00046 
00047 // Above method of setting is more intelligent.
00048 //const double two_pi  = 6.283185307179586476925286766559005768394338798750211641949888;  /**< @brief Mathematical constant for 2*pi. */
00049 //const double pi      = 3.141592653589793238462643383279502884197169399375105820974944;  /**< @brief Mathematical constant for pi. */
00050 //const double pi_2    = 1.57079632679489661923;  /**< @brief Mathematical constant for pi/2. */
00051 //const double pi_4    = 0.78539816339744830962;  /**< @brief Mathematical constant for pi/4. */
00052 //const float  two_pi_f= 6.283185307179586476925286766559005768394338798750211641949888;  /**< @brief Mathematical constant (float format) for 2*pi. */
00053 //const float  pi_f    = 3.141592653589793238462643383279502884197169399375105820974944;  /**< @brief Mathematical constant (float format) for pi. */
00054 //const float  pi_2_f  = 1.57079632679489661923;  /**< @brief Mathematical constant (float format) for pi/2. */
00055 //const float  pi_4_f  = 0.78539816339744830962;  /**< @brief Mathematical constant (float format) for pi/4. */
00056 
00057 
00058 }; // namespace ecl
00059 
00060 #endif /*ECL_MATH_CONSTANTS_HPP_*/


ecl_math
Author(s): Daniel Stonier
autogenerated on Sun Oct 5 2014 23:36:06