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/*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software Foundation,
* Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*
* The Original Code is:
* OGF/Graphite: Geometry and Graphics Programming Library + Utilities
* Copyright (C) 2000 Bruno Levy
* Contact: Bruno Levy
* <levy@loria.fr>
* ISA Project
* LORIA, INRIA Lorraine,
* Campus Scientifique, BP 239
* 54506 VANDOEUVRE LES NANCY CEDEX
* FRANCE
*/
/** \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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