GetEntities.cpp

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/** @example GetEntities.cpp
 * Description: Get entities and report non-vertex entity connectivity and vertex adjacencies.\n
 * This example shows how to get connectivity and adjacencies.\n
 *
 * To run: ./GetEntities [meshfile]\n
 * (default values can run if users don't specify a mesh file)
 */
 
#include "moab/Core.hpp"
#include "moab/Range.hpp"
#include "moab/CN.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" );
 
int main( int argc, char** argv )
{
    if( argc > 1 )
    {
        // User has input a mesh file
        test_file_name = argv[1];
    }
 
    // Instantiate & load a mesh from a file
    Core* mb = new( std::nothrow ) Core;
    if( NULL == mb ) return 1;
    ErrorCode rval = mb->load_mesh( test_file_name.c_str() );MB_CHK_ERR( rval );
 
    Range ents;
 
    // Get all entities in the database
    rval = mb->get_entities_by_handle( 0, ents );MB_CHK_ERR( rval );
 
    for( Range::iterator it = ents.begin(); it != ents.end(); ++it )
    {
        if( MBVERTEX == mb->type_from_handle( *it ) )
        {
            Range adjs;
            rval = mb->get_adjacencies( &( *it ), 1, 3, false, adjs );MB_CHK_ERR( rval );
            cout << "Vertex " << mb->id_from_handle( *it ) << " adjacencies:" << endl;
            adjs.print();
        }
        else if( mb->type_from_handle( *it ) < MBENTITYSET )
        {
            const EntityHandle* connect;
            int num_connect;
            rval = mb->get_connectivity( *it, connect, num_connect );MB_CHK_ERR( rval );
            cout << CN::EntityTypeName( mb->type_from_handle( *it ) ) << " " << mb->id_from_handle( *it )
                 << " vertex connectivity is: ";
            for( int i = 0; i < num_connect; i++ )
                cout << mb->id_from_handle( connect[i] ) << " ";
            cout << endl;
        }
    }
 
    delete mb;
 
    return 0;
}