MOAB: Mesh Oriented datABase  (version 5.3.0)
ContinentsOnGlobe.cpp File Reference
#include "moab/Core.hpp"
#include "moab/ReadUtilIface.hpp"
#include <cmath>
#include "moab/CartVect.hpp"
#include <iostream>
#include <fstream>
+ Include dependency graph for ContinentsOnGlobe.cpp:

Go to the source code of this file.

Functions

double getLat (CartVect p)
double getLon (CartVect p)
bool interior_point (vector< double > &coords, int &startLoop, int &endLoop, double lat, double lon)
int main (int argc, char **argv)

Variables

string bd_name = string( MESH_DIR ) + string( "/../examples/earth/boundary_points.dat" )
string loops = string( MESH_DIR ) + string( "/../examples/earth/SaveLoopCounts" )
string input_file = string( MESH_DIR ) + string( "/../examples/earth/poly2000.h5m" )

Function Documentation

double getLat ( CartVect  p)

Definition at line 26 of file ContinentsOnGlobe.cpp.

References moab::CartVect::normalize().

{
    p.normalize();
    return asin( p[2] );
}
double getLon ( CartVect  p)

Definition at line 31 of file ContinentsOnGlobe.cpp.

References moab::CartVect::normalize().

{
    p.normalize();
    double lon;

    lon = atan2( p[1], p[0] );

    if( lon < -2.95 )
    {  // separate Asia/Europe from Americas
        return 2.0 * M_PI + lon;
    }
    else
    {
        return lon;
    }
}
bool interior_point ( vector< double > &  coords,
int &  startLoop,
int &  endLoop,
double  lat,
double  lon 
)

Definition at line 51 of file ContinentsOnGlobe.cpp.

References moab::angle(), and moab::cross().

Referenced by main().

{
    // compute oriented angle between point and edges in the loop
    // if angle ~ +/-2Pi, it is in the interior
    double totalAngle = 0;
    for( int i = startLoop; i <= endLoop; i++ )
    {
        double x1 = coords[2 * i], y1 = coords[2 * i + 1];
        int i2 = i + 1;
        if( i == endLoop ) i2 = startLoop;
        double x2 = coords[2 * i2], y2 = coords[2 * i2 + 1];
        CartVect P1( x1 - lat, y1 - lon, 0. );
        CartVect P2( x2 - lat, y2 - lon, 0. );
        CartVect cross = P1 * P2;
        double angle1  = angle( P1, P2 );
        if( cross[2] < 0 ) angle1 = -angle1;
        totalAngle += angle1;
    }
    if( fabs( totalAngle + 2 * M_PI ) < 0.1 || fabs( totalAngle - 2 * M_PI ) < 0.1 ) return true;
    return false;
}
int main ( int  argc,
char **  argv 
)

get loops for boundaries

Definition at line 73 of file ContinentsOnGlobe.cpp.

References moab::Interface::add_entities(), bd_name, moab::Range::begin(), center(), moab::Interface::create_meshset(), moab::Range::end(), ErrorCode, moab::Interface::get_coords(), moab::Interface::get_entities_by_dimension(), getLat(), getLon(), input_file, interior_point(), moab::Interface::load_file(), loops, mb, MB_CHK_SET_ERR, MB_TAG_CREAT, MB_TAG_DENSE, MB_TYPE_INTEGER, MESHSET_SET, moab::Range::size(), moab::Interface::tag_get_handle(), moab::Interface::tag_set_data(), and moab::Interface::write_file().

{
    // Get MOAB instance
    Interface* mb = new( std::nothrow ) Core;
    if( NULL == mb ) return 1;

    if( argc > 1 )
    {
        // User has input file for mesh file
        input_file = argv[1];
    }

    cout << "input file : " << input_file << "\n";
    std::vector< double > coords;
    ifstream bdFile( bd_name.c_str() );
    if( !bdFile )
    {
        cout << endl << "Failed to open file " << bd_name << endl;
        ;
        return 1;
    }
    coords.resize( 0 );
    while( !bdFile.eof() )
    {
        double co;
        bdFile >> co;
        coords.push_back( co );
    }
    cout << " number of boundary points:" << coords.size() / 3 << "\n";
    /// get loops for boundaries
    vector< int > loopsindx;
    ifstream loopFile( loops.c_str() );
    while( !loopFile.eof() )
    {
        int indx;
        loopFile >> indx;
        loopsindx.push_back( indx );
    }
    cout << "number of loops: " << loopsindx.size() / 2 << "\n";
    // convert loops to lat-lon loops
    // it will be easier to determine in-out relations for points in 2d plane
    // careful with the international time zone; ( + - Pi longitude )
    vector< double > coords2d;
    coords2d.resize( coords.size() / 3 * 2 );
    for( int i = 0; i < (int)coords.size() / 3; i++ )
    {
        CartVect p( coords[3 * i], coords[3 * i + 1], coords[3 * i + 2] );
        coords2d[2 * i]     = getLat( p );
        coords2d[2 * i + 1] = getLon( p );
    }

    ErrorCode rval = mb->load_file( input_file.c_str() );MB_CHK_SET_ERR( rval, "Can't load file" );
    // look at the center of element, and see if it is inside the loop

    Range cells;
    rval = mb->get_entities_by_dimension( 0, 2, cells );MB_CHK_SET_ERR( rval, "Can't get cells" );

    cout << "number of cells: " << cells.size() << "\n";

    // tag for continents
    Tag tag1;
    int defa = -1;
    rval     = mb->tag_get_handle( "continent", 1, MB_TYPE_INTEGER, tag1, MB_TAG_DENSE | MB_TAG_CREAT, &defa );MB_CHK_SET_ERR( rval, "Trouble creating continent tag" );
    EntityHandle islandSets[6];
    for( int loop_index = 0; loop_index < 6; loop_index++ )
    {
        rval = mb->create_meshset( MESHSET_SET, islandSets[loop_index] );MB_CHK_SET_ERR( rval, "Can't create island set" );
        int startLoop = loopsindx[2 * loop_index];
        int endLoop   = loopsindx[2 * loop_index + 1];

        vector< EntityHandle > interiorCells;
        for( Range::iterator cit = cells.begin(); cit != cells.end(); cit++ )
        {
            EntityHandle cell = *cit;
            // see if it is in the interior of the loop
            CartVect center;
            rval = mb->get_coords( &cell, 1, &( center[0] ) );MB_CHK_SET_ERR( rval, "Can't get cell center coords" );
            double lat = getLat( center ), lon = getLon( center );
            // if NA, use some boxes too, for lat/lon
            // if (NorthAmerica && (lat < 0.15 || lon < M_PI || lon > 2*M_PI - 0.5) )
            //  continue;

            if( interior_point( coords2d, startLoop, endLoop, lat, lon ) )
            {
                interiorCells.push_back( cell );
                rval = mb->tag_set_data( tag1, &cell, 1, &loop_index );MB_CHK_SET_ERR( rval, "Can't get tag on cell" );
            }
        }

        rval = mb->add_entities( islandSets[loop_index], &interiorCells[0], interiorCells.size() );MB_CHK_SET_ERR( rval, "Can't add entities to set" );
    }

    std::stringstream islandFile;

    islandFile << "map.h5m";

    rval = mb->write_file( islandFile.str().c_str() );MB_CHK_SET_ERR( rval, "Can't write island file" );
    return 0;
}

Variable Documentation

string bd_name = string( MESH_DIR ) + string( "/../examples/earth/boundary_points.dat" )

Definition at line 22 of file ContinentsOnGlobe.cpp.

string input_file = string( MESH_DIR ) + string( "/../examples/earth/poly2000.h5m" )

Definition at line 24 of file ContinentsOnGlobe.cpp.

string loops = string( MESH_DIR ) + string( "/../examples/earth/SaveLoopCounts" )

Definition at line 23 of file ContinentsOnGlobe.cpp.

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