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#include <gmsh.h>
#include <iostream>
#include <set>
int main(int argc, char **argv)
{
bool write_file = false;
bool write_one_file_per_partition = false;
bool partition_using_metis = false;
gmsh::initialize();
// create a simple geometry and mesh it
gmsh::model::add("test");
gmsh::model::occ::addRectangle(0, 0, 0, 1, 1);
gmsh::model::occ::synchronize();
gmsh::model::mesh::generate(2);
// partition the mesh using Metis, or using the SimplePartition plugin (to
// create simple chessboard-like partitions). This will create new
// ("partitioned") entities in the model, that will behave exactly like other
// model entities. In particular, the full boundary representation is
// constructed provided that Mesh.PartitionCreateTopology == 1. The only
// difference is that partitioned entities have a "parent", which allows to
// link the partitioned entity with the entity it is a subset of. There are
// other options to govern how physical groups are treated
// (Mesh.PartitionCreatePhysicals), and if ghost cells should be created
// (Mesh.PartitionCreateGhostCells).
if(partition_using_metis) { gmsh::model::mesh::partition(3); }
else {
gmsh::plugin::setNumber("SimplePartition", "NumSlicesX", 3.);
gmsh::plugin::run("SimplePartition");
}
// write the partitioned mesh to disk?
if(write_file) {
// create one file per partition?
if(write_one_file_per_partition) {
gmsh::option::setNumber("Mesh.PartitionSplitMeshFiles", 1);
}
gmsh::write("partition.msh");
}
// iterate over partitioned entities and print some info
std::vector<std::pair<int, int> > entities;
gmsh::model::getEntities(entities);
for(std::vector<std::pair<int, int> >::iterator it = entities.begin();
it != entities.end(); it++) {
std::vector<int> partitions;
gmsh::model::getPartitions(it->first, it->second, partitions);
if(partitions.size()) {
std::string type;
gmsh::model::getType(it->first, it->second, type);
std::cout << "Entity (" << it->first << "," << it->second << ") "
<< "of type " << type << "\n";
std::cout << " - Partition(s):";
for(std::size_t i = 0; i < partitions.size(); i++)
std::cout << " " << partitions[i];
std::cout << "\n";
int pdim, ptag;
gmsh::model::getParent(it->first, it->second, pdim, ptag);
std::cout << " - Parent: (" << pdim << "," << ptag << ")\n";
std::vector<std::pair<int, int> > bnd;
gmsh::model::getBoundary({*it}, bnd);
std::cout << " - Boundary:";
for(std::size_t i = 0; i < bnd.size(); i++)
std::cout << " (" << bnd[i].first << "," << bnd[i].second << ")";
std::cout << "\n";
}
}
std::set<std::string> args(argv, argv + argc);
if(!args.count("-nopopup")) gmsh::fltk::run();
gmsh::finalize();
return 0;
}
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