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igfem_mesh_generation.cc
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Fri, Jul 19, 18:16

igfem_mesh_generation.cc
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/**
* @file igfem_mesh_generation.cc
* @author Aurelia Isabel Cuba Ramos <aurelia.cubaramos@epfl.ch>
* @date Fri Oct 30 14:55:51 2015
*
* @brief function to generate a IGFEM mesh for fe_engine tests
*
*
* Copyright (©) 2010-2011 EPFL (Ecole Polytechnique Fédérale de Lausanne)
* Laboratory (LSMS - Laboratoire de Simulation en Mécanique des Solides)
*
* Akantu 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.
*
* Akantu 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 Akantu. If not, see <http://www.gnu.org/licenses/>.
*
*/
/* -------------------------------------------------------------------------- */
#include "mesh.hh"
#include <fstream>
/* -------------------------------------------------------------------------- */
using namespace akantu;
void generateIGFEMMesh(const ElementType type, Mesh & mesh,
const std::string & filename) {
std::ifstream infile;
infile.open(filename.c_str());
if (!infile.good()) {
AKANTU_ERROR("Cannot open file " << filename);
}
UInt current_line = 0;
std::string line;
UInt first_node_number = std::numeric_limits<UInt>::max();
UInt last_node_number = 0;
while (infile.good()) {
std::getline(infile, line);
current_line++;
/// read all nodes
if (line == "$Nodes" || line == "$NOD") {
UInt nb_nodes;
std::getline(infile, line);
std::stringstream sstr(line);
sstr >> nb_nodes;
current_line++;
Array<Real> & nodes = const_cast<Array<Real> &>(mesh.getNodes());
nodes.resize(nb_nodes);
UInt index;
Real coord[3];
Int spatial_dimension = nodes.getNbComponent();
/// for each node, read the coordinates
for (Int i = 0; i < nb_nodes; ++i) {
UInt offset = i * spatial_dimension;
std::getline(infile, line);
std::stringstream sstr_node(line);
sstr_node >> index >> coord[0] >> coord[1] >> coord[2];
current_line++;
first_node_number = std::min(first_node_number, index);
last_node_number = std::max(last_node_number, index);
/// read the coordinates
for (Int j = 0; j < spatial_dimension; ++j)
nodes.data()[offset + j] = coord[j];
}
std::getline(infile, line); /// the end of block line
}
/// read all elements
if (line == "$Elements" || line == "$ELM") {
mesh.addConnectivityType(type);
Array<UInt> & connectivity =
const_cast<Array<UInt> &>(mesh.getConnectivity(type));
UInt node_per_element = connectivity.getNbComponent();
UInt nb_elements = 0;
std::getline(infile, line);
std::stringstream sstr(line);
sstr >> nb_elements;
current_line++;
for (Int i = 0; i < nb_elements; ++i) {
std::getline(infile, line);
std::stringstream sstr_elem(line);
current_line++;
Vector<UInt> local_connect(node_per_element);
for (Int j = 0; j < node_per_element; ++j) {
UInt node_index;
sstr_elem >> node_index;
AKANTU_DEBUG_ASSERT(node_index <= last_node_number,
"Node number not in range : line "
<< current_line);
node_index -= first_node_number;
local_connect(j) = node_index;
}
connectivity.push_back(local_connect);
}
std::getline(infile, line); /// the end of block line
}
}
}

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