rot_angle

kyosu::rot_angle = {}

inlineconstexpr

Callable object computing the normalized angle of rotation defined by a quaternion.

Defined in header

#include eve/module/quaternion.hpp>`

Callable Signatures

namespace eve
{
  auto rot_angle(auto q) const noexcept;
}

Parameters

q: quaternion, complex or floating

Return value

the rotation angle in radian. This is two times the arg of the quaternion.

---

Example

#include <kyosu/kyosu.hpp>
#include <eve/wide.hpp>
#include <iostream>
 
int main()
{
  using kyosu::rot_angle;
  using kyosu::complex_t;
  using kyosu::quaternion_t;
 
  std::cout << "Real:        ";
  std::cout << 72.9f << " -> " << rot_angle(72.9f) << "\n";
 
  std::cout << "Complex:     ";
  std::cout << kyosu::complex_t<float>(3.5f,-2.9f) << " -> " << rot_angle(kyosu::complex_t<float>(3.5f,-2.9f)) << "\n";
 
  std::cout << "Quaternion:  ";
  std::cout << kyosu::quaternion_t<double>(1.,2.,3.,4.) << " -> " << rot_angle(kyosu::quaternion_t<double>(1.,2.,3.,4.)) << "\n";
 
  std::cout << "SIMD:        ";
  using wc_t = eve::wide<kyosu::complex_t<double>, eve::fixed<2>>;
  std::cout << wc_t(kyosu::complex_t<double>(1.3,-3.7)) << " -> " << rot_angle(wc_t(kyosu::complex_t<double>(1.3,-3.7))) << "\n";
 
  return 0;
}