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/* SPDX-License-Identifier: GPL-2.0-or-later
* The Original Code is:
* OGF/Graphite: Geometry and Graphics Programming Library + Utilities
* Copyright 2000 Bruno Levy <levy@loria.fr> */
/** \file
* \ingroup freestyle
*/
#include "normal_cycle.h"
#include "matrix_util.h"
namespace Freestyle::OGF {
//_________________________________________________________
void NormalCycle::begin()
{
M_[0] = M_[1] = M_[2] = M_[3] = M_[4] = M_[5] = 0;
}
void NormalCycle::end()
{
double eigen_vectors[9];
MatrixUtil::semi_definite_symmetric_eigen(M_, 3, eigen_vectors, eigen_value_);
axis_[0] = Vec3r(eigen_vectors[0], eigen_vectors[1], eigen_vectors[2]);
axis_[1] = Vec3r(eigen_vectors[3], eigen_vectors[4], eigen_vectors[5]);
axis_[2] = Vec3r(eigen_vectors[6], eigen_vectors[7], eigen_vectors[8]);
// Normalize the eigen vectors
for (int i = 0; i < 3; i++) {
axis_[i].normalize();
}
// Sort the eigen vectors
i_[0] = 0;
i_[1] = 1;
i_[2] = 2;
double l0 = ::fabs(eigen_value_[0]);
double l1 = ::fabs(eigen_value_[1]);
double l2 = ::fabs(eigen_value_[2]);
if (l1 > l0) {
ogf_swap(l0, l1);
ogf_swap(i_[0], i_[1]);
}
if (l2 > l1) {
ogf_swap(l1, l2);
ogf_swap(i_[1], i_[2]);
}
if (l1 > l0) {
ogf_swap(l0, l1);
ogf_swap(i_[0], i_[1]);
}
}
//_________________________________________________________
} // namespace Freestyle::OGF
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