GmshUtil.hpp

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    1 /**
    2  * MOAB, a Mesh-Oriented datABase, is a software component for creating,
    3  * storing and accessing finite element mesh data.
    4  *
    5  * Copyright 2004 Sandia Corporation.  Under the terms of Contract
    6  * DE-AC04-94AL85000 with Sandia Corporation, the U.S. Government
    7  * retains certain rights in this software.
    8  *
    9  * This library is free software; you can redistribute it and/or
   10  * modify it under the terms of the GNU Lesser General Public
   11  * License as published by the Free Software Foundation; either
   12  * version 2.1 of the License, or (at your option) any later version.
   13  *
   14  */
   15  
   16 #ifndef GMSH_UTIL_HPP
   17 #define GMSH_UTIL_HPP
   18  
   19 #include "moab/EntityType.hpp"
   20  
   21 namespace moab
   22 {
   23  
   24 //! Structure defining relation between MOAB and VTK element
   25 //! types.  VTK had different types for quadratic than linear
   26 //! elements, so a tuple of the MOAB type and number of
   27 //! elements maps to a VTK type.
   28 struct GmshElemType
   29 {
   30     const char* name;       //!< String name for use in error messages
   31     unsigned gmsh_type;     //!< GMsh integer type
   32     EntityType mb_type;     //!< MOAB type
   33     unsigned num_nodes;     //!< Number of nodes (0 for polygon)
   34     const int* node_order;  //!< Gmsh element node ordering, indexed by
   35                             //!< the Gmsh node position and containing
   36                             //!< the corresponding MOAB node position.
   37                             //!< NOTE: This field is NULL if MOAB and Gmsh
   38                             //!< ordering is the same!
   39 };
   40  
   41 //! General data about GMsh files for use by read and write code.
   42 //! \author Jason Kraftcheck
   43 class GmshUtil
   44 {
   45  
   46   public:
   47     //! Gmsh types, indexed by Gmsh type number.
   48     //! For unused Gmsh type numbers, mb_type will be MBMAXTYPE.
   49     static const GmshElemType gmshElemTypes[];
   50  
   51     //! Length of \ref gmshElemTypes
   52     static const unsigned numGmshElemType;
   53  
   54     //! Get the Gmsh type corresponding to a tuple of the MOAB type and number of nodes.
   55     //! num_nodes is ignored for MBPOLYGON type.  Returns -1 for unsupported types.
   56     static int get_gmsh_type( EntityType type, unsigned num_nodes );
   57 };
   58  
   59 }  // namespace moab
   60  
   61 #endif