getfem_level_set.cc

/*===========================================================================
 
 Copyright (C) 1999-2026 Yves Renard
 
 This file is a part of GetFEM
 
 GetFEM  is  free software;  you  can  redistribute  it  and/or modify it
 under  the  terms  of the  GNU  Lesser General Public License as published
 by  the  Free Software Foundation;  either version 3 of the License,  or
 (at your option) any later version along with the GCC Runtime Library
 Exception either version 3.1 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 Lesser General Public
 License and GCC Runtime Library Exception for more details.
 You  should  have received a copy of the GNU Lesser General Public License
 along  with  this program. If not, see https://www.gnu.org/licenses/.
 
===========================================================================*/
 
 
#include "getfem/getfem_level_set.h"
 
namespace getfem {
 
  level_set::level_set(const mesh &msh, dim_type deg,
                       bool with_secondary_)
    : degree_(deg), mf(&classical_mesh_fem(msh, deg)),
      with_secondary(with_secondary_) {
    shift_ls = scalar_type(0);
    primary_.resize(mf->nb_dof());
    if (has_secondary()) secondary_.resize(mf->nb_dof());
    this->add_dependency(*mf);
  }
 
  void level_set::copy_from(const level_set &ls) {
    degree_ = ls.degree_;
    mf = ls.mf;
    primary_ = ls.primary_;
    secondary_ = ls.secondary_;
    with_secondary = ls.with_secondary;
    shift_ls = ls.shift_ls;
    this->add_dependency(*mf);
  }
 
 
  level_set::level_set(const level_set &ls) : context_dependencies() {
    copy_from(ls);
  }
 
  level_set &level_set::operator =(const level_set &ls) {
    this->sup_dependency(*mf);
    copy_from(ls);
    return *this;
  }
 
  level_set::~level_set() { }
 
  void level_set::reinit(void) {
    primary_.resize(mf->nb_dof());
    if (has_secondary()) secondary_.resize(mf->nb_dof());
    touch();
  }
 
  pmesher_signed_distance level_set::mls_of_convex(size_type cv, unsigned lsnum,
                                                   bool inverted) const {
    assert(this); assert(mf); 
    GMM_ASSERT1(mf->linked_mesh().convex_index().is_in(cv), "convex " << cv
                << " is not in the level set mesh!");
    GMM_ASSERT1(mf->fem_of_element(cv), "Internal error");
    GMM_ASSERT1(!mf->is_reduced(), "Internal error");
    std::vector<scalar_type> coeff(mf->nb_basic_dof_of_element(cv));
    GMM_ASSERT1(values(lsnum).size() == mf->nb_dof(),
                "Inconsistent state in the levelset: nb_dof=" << 
                mf->nb_dof() << ", values(" << lsnum << ").size=" << 
                values(lsnum).size());
    for (size_type i = 0; i < coeff.size(); ++i)
      coeff[i] = (!inverted ? scalar_type(1) : scalar_type(-1)) * 
        values(lsnum)[mf->ind_basic_dof_of_element(cv)[i]];
    return new_mesher_level_set(mf->fem_of_element(cv), coeff, shift_ls);
  }
 
  size_type level_set::memsize() const {
    return sizeof(*this) + 
      primary_.capacity() * sizeof(scalar_type) + 
      secondary_.capacity() * sizeof(scalar_type);
  }
 
  void level_set::simplify(scalar_type eps) {
    for (dal::bv_visitor cv(mf->linked_mesh().convex_index());
         !cv.finished(); ++cv) {
      scalar_type h = mf->linked_mesh().convex_radius_estimate(cv);
      for (size_type i = 0; i < mf->nb_basic_dof_of_element(cv); ++i) {
        size_type dof = mf->ind_basic_dof_of_element(cv)[i];
        if (gmm::abs(primary_[dof]) < h*eps) {
          primary_[dof] = scalar_type(0);
          // cout << "Simplify dof " << dof << " : " << mf->point_of_dof(dof) << endl;
        }
        if (has_secondary() && gmm::abs(secondary_[dof]) < h*eps)
            secondary_[dof] = scalar_type(0);
      }
 
    }
    touch();
  }
 
  
  struct dummy_level_set_ {
    level_set ls;
    dummy_level_set_() : ls(dummy_mesh()) {}
  };
 
  const level_set &dummy_level_set()
  { return dal::singleton<dummy_level_set_>::instance().ls; }
 
 
 
}  /* end of namespace getfem.                                             */