SetsNTags.cpp

Description: Get the sets representing materials and Dirichlet/Neumann boundary conditions and list their contents.
This example shows how to get entity sets, and tags on those sets.

To run: ./SetsNTags [meshfile]
(default values can run if users don't specify a mesh file)

/** @example SetsNTags.cpp
 * Description: Get the sets representing materials and Dirichlet/Neumann boundary conditions and
 * list their contents.\n This example shows how to get entity sets, and tags on those sets.
 *
 * To run: ./SetsNTags [meshfile]\n
 * (default values can run if users don't specify a mesh file)
 */
 
#include "moab/Core.hpp"
#include "moab/Interface.hpp"
#include "moab/Range.hpp"
#include "MBTagConventions.hpp"
 
#include <iostream>
 
using namespace moab;
using namespace std;
 
#ifndef MESH_DIR
#define MESH_DIR "."
#endif
 
string test_file_name = string( MESH_DIR ) + string( "/hex01.vtk" );
 
// Tag names for these conventional tags come from MBTagConventions.hpp
const char* tag_nms[] = { MATERIAL_SET_TAG_NAME, DIRICHLET_SET_TAG_NAME, NEUMANN_SET_TAG_NAME };
 
int main( int argc, char** argv )
{
 // Get the material set tag handle
 Tag mtag;
 ErrorCode rval;
 Range sets, set_ents;
 
 // Get MOAB instance
 Interface* mb = new( std::nothrow ) Core;
 if( NULL == mb ) return 1;
 
 // Need option handling here for input filename
 if( argc > 1 )
 {
 // User has input a mesh file
 test_file_name = argv[1];
 }
 
 // Load a file
 rval = mb->load_file( test_file_name.c_str() );MB_CHK_ERR( rval );
 
 // Loop over set types
 for( int i = 0; i < 3; i++ )
 {
 // Get the tag handle for this tag name; tag should already exist (it was created during
 // file read)
 rval = mb->tag_get_handle( tag_nms[i], 1, MB_TYPE_INTEGER, mtag );MB_CHK_ERR( rval );
 
 // Get all the sets having that tag (with any value for that tag)
 sets.clear();
 rval = mb->get_entities_by_type_and_tag( 0, MBENTITYSET, &mtag, NULL, 1, sets );MB_CHK_ERR( rval );
 
 // Iterate over each set, getting the entities and printing them
 Range::iterator set_it;
 for( set_it = sets.begin(); set_it != sets.end(); ++set_it )
 {
 // Get the id for this set
 int set_id;
 rval = mb->tag_get_data( mtag, &( *set_it ), 1, &set_id );MB_CHK_ERR( rval );
 
 // Get the entities in the set, recursively
 rval = mb->get_entities_by_handle( *set_it, set_ents, true );MB_CHK_ERR( rval );
 
 cout << tag_nms[i] << " " << set_id << " has " << set_ents.size() << " entities:" << endl;
 set_ents.print( " " );
 set_ents.clear();
 }
 }
 
 delete mb;
 
 return 0;
}