GmshUtil.hpp

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/**
 * MOAB, a Mesh-Oriented datABase, is a software component for creating,
 * storing and accessing finite element mesh data.
 *
 * Copyright 2004 Sandia Corporation.  Under the terms of Contract
 * DE-AC04-94AL85000 with Sandia Corporation, the U.S. Government
 * retains certain rights in this software.
 *
 * This library 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 2.1 of the License, or (at your option) any later version.
 *
 */

#ifndef GMSH_UTIL_HPP
#define GMSH_UTIL_HPP

#include "moab/EntityType.hpp"

namespace moab
{

//! Structure defining relation between MOAB and VTK element
//! types.  VTK had different types for quadratic than linear
//! elements, so a tuple of the MOAB type and number of
//! elements maps to a VTK type.
struct GmshElemType
{
    const char* name;       //!< String name for use in error messages
    unsigned gmsh_type;     //!< GMsh integer type
    EntityType mb_type;     //!< MOAB type
    unsigned num_nodes;     //!< Number of nodes (0 for polygon)
    const int* node_order;  //!< Gmsh element node ordering, indexed by
                            //!< the Gmsh node position and containing
                            //!< the corresponding MOAB node position.
                            //!< NOTE: This field is NULL if MOAB and Gmsh
                            //!< ordering is the same!
};

//! General data about GMsh files for use by read and write code.
//! \author Jason Kraftcheck
class GmshUtil
{

  public:
    //! Gmsh types, indexed by Gmsh type number.
    //! For unused Gmsh type numbers, mb_type will be MBMAXTYPE.
    static const GmshElemType gmshElemTypes[];

    //! Length of \ref gmshElemTypes
    static const unsigned numGmshElemType;

    //! Get the Gmsh type corresponding to a tuple of the MOAB type and number of nodes.
    //! num_nodes is ignored for MBPOLYGON type.  Returns -1 for unsupported types.
    static int get_gmsh_type( EntityType type, unsigned num_nodes );
};

}  // namespace moab

#endif