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#include "euler.hpp"
#include <cmath>
namespace euler {
euler_t OTR_COMPAT_EXPORT rmat_to_euler(const rmat& R)
{
using std::atan2;
using std::sqrt;
const double cy = sqrt(R(2,2)*R(2, 2) + R(2, 1)*R(2, 1));
const bool large_enough = cy > 1e-10;
if (large_enough)
return euler_t(atan2(-R(1, 0), R(0, 0)),
atan2(R(2, 0), cy),
atan2(-R(2, 1), R(2, 2)));
else
return euler_t(atan2(R(0, 1), R(1, 1)),
atan2(R(2, 0), cy),
0);
}
// tait-bryan angles, not euler
rmat OTR_COMPAT_EXPORT euler_to_rmat(const euler_t& input)
{
const double H = -input(0);
const double P = -input(1);
const double B = -input(2);
using std::cos;
using std::sin;
const auto c1 = cos(H);
const auto s1 = sin(H);
const auto c2 = cos(P);
const auto s2 = sin(P);
const auto c3 = cos(B);
const auto s3 = sin(B);
return rmat(
// z
c1 * c2,
c1 * s2 * s3 - c3 * s1,
s1 * s3 + c1 * c3 * s2,
// y
c2 * s1,
c1 * c3 + s1 * s2 * s3,
c3 * s1 * s2 - c1 * s3,
// x
-s2,
c2 * s3,
c2 * c3
);
}
// https://en.wikipedia.org/wiki/Davenport_chained_rotations#Tait.E2.80.93Bryan_chained_rotations
void OTR_COMPAT_EXPORT tait_bryan_to_matrices(const euler_t& input,
rmat& r_roll,
rmat& r_pitch,
rmat& r_yaw)
{
using std::cos;
using std::sin;
{
const double phi = -input(2);
const double sin_phi = sin(phi);
const double cos_phi = cos(phi);
r_roll = rmat(1, 0, 0,
0, cos_phi, -sin_phi,
0, sin_phi, cos_phi);
}
{
const double theta = input(1);
const double sin_theta = sin(theta);
const double cos_theta = cos(theta);
r_pitch = rmat(cos_theta, 0, -sin_theta,
0, 1, 0,
sin_theta, 0, cos_theta);
}
{
const double psi = -input(0);
const double sin_psi = sin(psi);
const double cos_psi = cos(psi);
r_yaw = rmat(cos_psi, -sin_psi, 0,
sin_psi, cos_psi, 0,
0, 0, 1);
}
}
} // end ns euler
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