rot_axis

kyosu::rot_axis = {}

inlineconstexpr

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

Defined in header

#include eve/module/quaternion.hpp>`

Callable Signatures

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

Parameters

q: quaternion, complex or floating.

Return value

a span containing the three coordinates of the axis if the quaternion is zero {1, 0, 0} is returned

---

Example

#include <kyosu/kyosu.hpp>
#include <eve/wide.hpp>
#include <iostream>
 
int main()
{
  using kyosu::rot_axis;
  using kyosu::complex_t;
  using kyosu::quaternion_t;
 
  std::cout << "Real:        ";
  auto v = rot_axis(kyosu::complex_t<float>(3.5f,-2.9f));
  std::cout << 72.9f << " -> (" << v[0] << ", " << v[1] << ",  " << v[2] << ")\n";
 
  std::cout << "Complex:     ";
  auto vc = rot_axis(kyosu::complex_t<float>(3.5f,-2.9f));
  std::cout << kyosu::complex_t<float>(3.5f,-2.9f) << " -> (" << vc[0] << ", " << vc[1] << ",  " << vc[2] << ")\n";
 
  std::cout << "Quaternion:  ";
  auto vq = rot_axis(kyosu::quaternion_t<double>(1.,2.,3.,4.));
  std::cout << kyosu::quaternion_t<double>(1.,2.,3.,4.) << " -> " << vq[0] << ", " << vq[1] << ",  " << vq[2] << ")\n";
 
  return 0;
}