CELL.h

// File : CELL.h
//
// Copyright 2006
// The University of North Carolina at Chapel Hill
// 
//
// Permission to use, copy, modify, distribute and sell this software and its 
// documentation for any purpose is hereby granted without fee, provided that 
// the above copyright notice appear in all copies and that both that copyright 
// notice and this permission notice appear in supporting documentation. 
// Binaries may be compiled with this software without any royalties or 
// restrictions. 
//
// The University of North Carolina at Chapel Hill makes no representations 
// about the suitability of this software for any purpose. It is provided 
// "as is" without express or implied warranty.
//

#ifndef CELL_H
#define CELL_H
#include <cstdlib>

enum CELL_STATE {EMPTY, NEGATIVE, POSITIVE, REPULSOR, ATTRACTOR};

class CELL  
{
public:
  CELL(float north, 
       float east, 
       float south, 
       float west, 
       CELL* parent = NULL, 
       int depth = 0);
  
  CELL(int depth = 0);

  ~CELL();
  

  CELL* children[4]; 
  

  float bounds[4];


  CELL* neighbors[8];


  float stencil[9];
  
  float center[2];    
  int depth;          
  bool candidate;     

  CELL* parent;       
  CELL_STATE state;   

  void refine();      

  // solver-related variables
  bool boundary;      
  float potential;    
  float b;            
  float residual;     
  int index;          

  // neighbor lookups
  CELL* northNeighbor();  
  CELL* southNeighbor();  
  CELL* westNeighbor();   
  CELL* eastNeighbor();   
};

#endif

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