// $Id: face.h,v 1.1.1.1 2000/11/02 08:47:16 fritzi Exp $

// This file is part of the DEAL Library
// DEAL is Copyright(1995) by
// Roland Becker, Guido Kanschat, Franz-Theo Suttmeier


#ifndef __face_h
#define __face_h
#ifndef __error_h
#include <deal/errors.h>
#endif

class Cell;
class Vertex;

/*
CLASS
   Face
   */
class Face
{
protected:
  int first, direction;
  Face() : first(-1), direction(0) {}
public:
  //////////
  virtual int numeric_index(int ch, int i) const;
  //////////
  virtual void adjust(const Vertex*, const Vertex*) = 0;
  //////////
  virtual int _adjust(const Vertex*, const Vertex*) = 0;
  //////////
  void adjust() { first = 0; direction = 1; }
  //////////
  virtual Cell* child(unsigned) const;
  //////////
  virtual Vertex* _vertex(unsigned) const = 0;
  //////////
  virtual Vertex* vertex(unsigned) const = 0;
  //////////
  virtual Vertex* sec_vertex(unsigned) const;

  //////////
  virtual unsigned n_prime_vertices() const = 0;
  //////////
  virtual unsigned n_sec_vertices() const;

  //////////
  virtual bool refined() const;
  //////////
  virtual bool double_refined() const;
  //////////
  virtual unsigned nchildren() const;
  //////////
  virtual int neighbour_number(unsigned) const;

  //////////
  typedef enum { ptface, lineface, triface, quadface } FaceType;
  //////////
  virtual FaceType type() const = 0;
  //////////
  virtual const char* name() const = 0;
};

//////////
typedef enum
{
  face_normal = 0,
  face_fulltop = 1,
  face_numeric = 2,
  face_norecursion = 4
} FaceQual;
#endif