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