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#ifndef _RHEOLEF_REFERENCE_ELEMENT_H
#define _RHEOLEF_REFERENCE_ELEMENT_H
///
/// This file is part of Rheolef.
///
/// Copyright (C) 2000-2009 Pierre Saramito <Pierre.Saramito@imag.fr>
///
/// Rheolef is free software; you can redistribute it and/or modify
/// it under the terms of the GNU General Public License as published by
/// the Free Software Foundation; either version 2 of the License, or
/// (at your option) any later version.
///
/// Rheolef is distributed in the hope that it will be useful,
/// but WITHOUT ANY WARRANTY; without even the implied warranty of
/// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
/// GNU General Public License for more details.
///
/// You should have received a copy of the GNU General Public License
/// along with Rheolef; if not, write to the Free Software
/// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
/// 
/// =========================================================================
//
// groups misc helper functions:
// local renumbering, etc
//
#include "rheolef/point.h"
#include <boost/array.hpp>

namespace rheolef {

/*Class:reference_element
NAME: @code{reference_element} - reference element
@cindex  reference element
@clindex reference_element
SYNOPSYS:
  @noindent
  The @code{reference_element} class defines all supported types of 
  geometrical elements in one, two and three dimensions. The set of
  supported elements are designate by a letter
  @table @samp
       	@item p
       		point (dimension 0)
       	@item e
       		edge (dimension 1)
	@item t
		triangle(dimension 2)
	@item q
		quadrangle(dimension 2)
	@item T
		tetrahedron(dimension 3)
        @item P
		prism(dimension 3)
	@item H
		hexaedron(dimension 3)
  @end table

AUTHORS:
    LMC-IMAG, 38041 Grenoble cedex 9, France
   | Pierre.Saramito@imag.fr
DATE:   30 november 2003
End:
*/

//<reference_element:

class reference_element {
public:

// typedefs:

    typedef std::vector<int>::size_type size_type;

    // defines variant_type { p, t, q ..., H, ...};
    // in an automatically generated file :

    typedef size_type variant_type; 
    static const variant_type
	p = 0, 
	e = 1, 
	t = 2, 
	q = 3, 
	T = 4, 
	P = 5, 
	H = 6, 
	max_variant = 7;

// allocators/deallocators:

    reference_element (variant_type x = max_variant)
      : _x(x) { assert_macro (x >= 0 && x <= max_variant, "invalid type " << x); }

// initializers:

    void set_variant (variant_type x) { _x = x; }
    void set_variant (size_type n_vertex, size_type dim) { _x = variant (n_vertex, dim); }
    void set_name    (char name);

// accessors:

    variant_type variant() const { return _x; }
    char name() const { return _name[_x]; }
    size_type dimension() const { return _dimension[_x]; }
    size_type size() const { return _n_vertex[_x]; }
    size_type n_subgeo(size_type subgeo_dim) const { return n_subgeo (variant(), subgeo_dim); }
    size_type n_edge() const { return n_subgeo(1); }
    size_type n_face() const { return n_subgeo(2); }
    size_type subgeo_size (size_type subgeo_dim, size_type loc_isid) const { 
	return subgeo_n_node (_x, 1, subgeo_dim, loc_isid); }
    size_type subgeo_local_vertex(size_type subgeo_dim, size_type loc_isid, size_type loc_jsidvert) const {
        return subgeo_local_node (_x, 1, subgeo_dim, loc_isid, loc_jsidvert); }

    // TODO: use template<class T> instead of Float
    const point_basic<Float>& vertex (size_type iloc) const;
    friend Float measure (reference_element hat_K);
    Float side_measure (size_type loc_isid) const;
    void side_normal (size_type loc_isid, point_basic<Float>& hat_n) const;

// helpers:

    static variant_type variant  (char name);
    static variant_type variant  (size_type n_vertex, size_type dim);
    static char         name     (variant_type variant) { return _name     [variant]; }
    static size_type dimension   (variant_type variant) { return _dimension[variant]; }
    static size_type n_vertex    (variant_type variant) { return _n_vertex [variant]; }
    static size_type n_node      (variant_type variant, size_type order);

    static size_type n_sub_edge    (variant_type variant);
    static size_type n_sub_face    (variant_type variant);
    static size_type n_subgeo      (variant_type variant, size_type subgeo_dim);
    static size_type subgeo_n_node (variant_type variant, size_type order, size_type subgeo_dim, size_type loc_isid);
    static size_type subgeo_local_node (variant_type variant, size_type order, size_type subgeo_dim, size_type loc_isid, size_type loc_jsidnod);

    static variant_type first_variant_by_dimension (size_type dim) {
    		return _first_variant_by_dimension[dim]; }
    static variant_type  last_variant_by_dimension (size_type dim) {
    		return _first_variant_by_dimension[dim+1]; }

    static size_type first_inod_by_variant (variant_type variant, size_type order, variant_type subgeo_variant);
    static size_type  last_inod_by_variant (variant_type variant, size_type order, variant_type subgeo_variant)
       { return first_inod_by_variant (variant, order, subgeo_variant+1); }
    static size_type first_inod (variant_type variant, size_type order, size_type subgeo_dim)
       { return first_inod_by_variant (variant, order, first_variant_by_dimension(subgeo_dim)); }
    static size_type  last_inod (variant_type variant, size_type order, size_type subgeo_dim)
       { return first_inod_by_variant (variant, order,  last_variant_by_dimension(subgeo_dim)); }
    static void init_local_nnode_by_variant (size_type order, boost::array<size_type,reference_element::max_variant>& loc_nnod_by_variant);

protected:
// constants:

    static const char      _name [max_variant];
    static const size_type _dimension [max_variant];
    static const size_type _n_vertex [max_variant];
    static const variant_type _first_variant_by_dimension[5];

// data:

    variant_type _x;
};
//>reference_element:

class reference_element_p {
public:

// typedefs:

  typedef point_basic<size_t>::size_type size_type;

// static functions:

  static size_type n_subgeo          (size_type side_dim);
  static size_type subgeo_n_node     (size_type order, size_type side_dim, size_type loc_isid);
  static size_type subgeo_local_node (size_type order, size_type side_dim, size_type loc_isid, size_type loc_jsidnod);
  static size_type ilat2loc_inod     (size_type order, const point_basic<size_type>& ilat);
  static size_type first_inod_by_variant (size_type order, size_type subgeo_variant);
  static const point_basic<Float>& vertex (size_type iloc);
  static Float side_measure (size_type loc_isid);
  static void side_normal (size_type loc_isid, point_basic<Float>& hat_n);
};

class reference_element_e {
public:

// typedefs:

  typedef point_basic<size_t>::size_type size_type;

// static functions:

  static size_type n_subgeo          (size_type side_dim);
  static size_type subgeo_n_node     (size_type order, size_type side_dim, size_type loc_isid);
  static size_type subgeo_local_node (size_type order, size_type side_dim, size_type loc_isid, size_type loc_jsidnod);
  static size_type ilat2loc_inod     (size_type order, const point_basic<size_type>& ilat);
  static size_type first_inod_by_variant (size_type order, size_type subgeo_variant);
  static const point_basic<Float>& vertex (size_type iloc);
  static Float side_measure (size_type loc_isid);
  static void side_normal (size_type loc_isid, point_basic<Float>& hat_n);
};

class reference_element_t {
public:

// typedefs:

  typedef point_basic<size_t>::size_type size_type;

// static functions:

  static size_type n_subgeo          (size_type side_dim);
  static size_type subgeo_n_node     (size_type order, size_type side_dim, size_type loc_isid);
  static size_type subgeo_local_node (size_type order, size_type side_dim, size_type loc_isid, size_type loc_jsidnod);
  static size_type ilat2loc_inod     (size_type order, const point_basic<size_type>& ilat);
  static size_type first_inod_by_variant (size_type order, size_type subgeo_variant);
  static const point_basic<Float>& vertex (size_type iloc);
  static Float side_measure (size_type loc_isid);
  static void side_normal (size_type loc_isid, point_basic<Float>& hat_n);
};

class reference_element_q {
public:

// typedefs:

  typedef point_basic<size_t>::size_type size_type;

// static functions:

  static size_type n_subgeo          (size_type side_dim);
  static size_type subgeo_n_node     (size_type order, size_type side_dim, size_type loc_isid);
  static size_type subgeo_local_node (size_type order, size_type side_dim, size_type loc_isid, size_type loc_jsidnod);
  static size_type ilat2loc_inod     (size_type order, const point_basic<size_type>& ilat);
  static size_type first_inod_by_variant (size_type order, size_type subgeo_variant);
  static const point_basic<Float>& vertex (size_type iloc);
  static Float side_measure (size_type loc_isid);
  static void side_normal (size_type loc_isid, point_basic<Float>& hat_n);
};

class reference_element_T {
public:

// typedefs:

  typedef point_basic<size_t>::size_type size_type;

// static functions:

  static size_type n_subgeo          (size_type side_dim);
  static size_type subgeo_n_node     (size_type order, size_type side_dim, size_type loc_isid);
  static size_type subgeo_local_node (size_type order, size_type side_dim, size_type loc_isid, size_type loc_jsidnod);
  static size_type ilat2loc_inod     (size_type order, const point_basic<size_type>& ilat);
  static size_type first_inod_by_variant (size_type order, size_type subgeo_variant);
  static size_type face2edge         (size_type loc_iface, size_type loc_iface_jedg);
  static int       face2edge_orient  (size_type loc_iface, size_type loc_iface_jedg);
  static const point_basic<Float>& vertex (size_type iloc);
  static Float side_measure (size_type loc_isid);
  static void side_normal (size_type loc_isid, point_basic<Float>& hat_n);
};

class reference_element_P {
public:

// typedefs:

  typedef point_basic<size_t>::size_type size_type;

// static functions:

  static size_type n_subgeo          (size_type side_dim);
  static size_type subgeo_n_node     (size_type order, size_type side_dim, size_type loc_isid);
  static size_type subgeo_local_node (size_type order, size_type side_dim, size_type loc_isid, size_type loc_jsidnod);
  static size_type ilat2loc_inod     (size_type order, const point_basic<size_type>& ilat);
  static size_type first_inod_by_variant (size_type order, size_type subgeo_variant);
  static size_type face2edge         (size_type loc_iface, size_type loc_iface_jedg);
  static int       face2edge_orient  (size_type loc_iface, size_type loc_iface_jedg);
  static const point_basic<Float>& vertex (size_type iloc);
  static Float side_measure (size_type loc_isid);
  static void side_normal (size_type loc_isid, point_basic<Float>& hat_n);
};

class reference_element_H {
public:

// typedefs:

  typedef point_basic<size_t>::size_type size_type;

// static functions:

  static size_type n_subgeo          (size_type side_dim);
  static size_type subgeo_n_node     (size_type order, size_type side_dim, size_type loc_isid);
  static size_type subgeo_local_node (size_type order, size_type side_dim, size_type loc_isid, size_type loc_jsidnod);
  static size_type ilat2loc_inod     (size_type order, const point_basic<size_type>& ilat);
  static size_type first_inod_by_variant (size_type order, size_type subgeo_variant);
  static size_type face2edge         (size_type loc_iface, size_type loc_iface_jedg);
  static int       face2edge_orient  (size_type loc_iface, size_type loc_iface_jedg);
  static const point_basic<Float>& vertex (size_type iloc);
  static Float side_measure (size_type loc_isid);
  static void side_normal (size_type loc_isid, point_basic<Float>& hat_n);
};

} // namespace rheolef
#endif // _RHEOLEF_REFERENCE_ELEMENT_H