edge.C

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// The libMesh Finite Element Library.
// Copyright (C) 2002-2014 Benjamin S. Kirk, John W. Peterson, Roy H. Stogner

// This library 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 2.1 of the License, or (at your option) any later version.

// This library 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 for more details.

// You should have received a copy of the GNU Lesser General Public
// License along with this library; if not, write to the Free Software
// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA



// Local includes
#include "libmesh/edge.h"
#include "libmesh/node_elem.h"

namespace libMesh
{


UniquePtr<Elem> Edge::side (const unsigned int i) const
{
  libmesh_assert_less (i, 2);
  const Elem* the_parent = this;
  Elem *nodeelem = new NodeElem(const_cast<Elem*>(the_parent));
  nodeelem->set_node(0) = this->get_node(i);
  return UniquePtr<Elem>(nodeelem);
}


UniquePtr<Elem> Edge::build_side (const unsigned int i, bool) const
{
  libmesh_assert_less (i, 2);
  const Elem* the_parent = this;
  Elem *nodeelem = new NodeElem(const_cast<Elem*>(the_parent));
  nodeelem->set_node(0) = this->get_node(i);
  return UniquePtr<Elem>(nodeelem);
}


bool Edge::is_child_on_side(const unsigned int c,
                            const unsigned int s) const
{
  libmesh_assert_less (c, this->n_children());
  libmesh_assert_less (s, this->n_sides());

  return (c == s);
}



unsigned int Edge::opposite_side(const unsigned int side_in) const
{
  libmesh_assert_less (side_in, 2);
  return 1 - side_in;
}



unsigned int Edge::opposite_node(const unsigned int node_in,
                                 const unsigned int libmesh_dbg_var(side_in)) const
{
  libmesh_assert_less (node_in, 2);
  libmesh_assert_less (side_in, this->n_sides());
  libmesh_assert(this->is_node_on_side(node_in, side_in));

  return 1 - node_in;
}



} // namespace libMesh