---

BCMixed2D.h

/****************************************************************************
 *                                                                          *
 *  Program: FDDlib                                                         *
 *  Version: 1.1                                                            *
 *                                                                          *
 *  Copyright (C) 2002 - 2004 by Eric Miller and Dana Brooks                *
 *  All rights reserved.                                                    *
 *                                                                          *
 *  This software is Version 1.1 of the fddlib tomography toolbox.          *
 *  It is not to be redistributed or used for any commercial purpose        *
 *  without the prior written consent of the authors and Northeastern       *
 *  University.                                                             *
 *                                                                          *
 *  This software is provided as is, and any express or implied warranties, *
 *  including but not limited to the implied warranty of merchantability    *
 *  and the implied warranty of fitness for a particular purpose, are dis-  *
 *  claimed.  In no event shall the authors or Northeastern University be   *
 *  liable for any direct, indirect, incidental, special, exemplary, or     *
 *  consequential damages (including but not limited to procurement of      * 
 *  substitute goods or services; loss of use, data, or profits; or busi-   *
 *  ness interruption) however caused and on any theory of liability,       *
 *  whether in contract, strict liability, or tort (including negligence or *
 *  otherwise) arising in any way from the use of this software, even if    *
 *  advised of the possibility of such damage.                              *
 *                                                                          *
 *  Portions of this code benefit from ideas from Kyle Guilbert, Greg       *
 *  Boverman, Derek Uluski, David Kaeli, and Jennifer Black                 *
 *                                                                          *
 ****************************************************************************/

#ifndef _BCMIXED2D_H_
#define _BCMIXED2D_H_

#include "SparseRowMatrix.h"
#include "BoundaryCondition2D.h"
#include "ArbitraryCartesianGrid2D.h"
#include "CartesianNode2D.h"
#include <string>

// Minimum value for each component of normal vector
#define BC_NORMTOL 1.0e-10

namespace FDDlib {

class BCMixed2D : public BoundaryCondition2D {
protected:

  struct s_neighbordata {
    CartesianNode2D* n_node;
    bool n_borderNode;
    int n_linearIndex;
  };

  bool activeAndInternal(const s_neighbordata& ndata) const;

  double a_;
  
  const static int UNKNOWN_VALUE = -10;
  
  void resetData(std::vector<s_neighbordata>& datavec) const;
  
public:
  BCMixed2D(double a);
  
  virtual void apply(const ArbitraryCartesianGrid2D& grid,
             SparseRowMatrix<double>& A) const throw(std::string);
  
  double getA() const;

  void setA(double a);
  
};
}

#endif

---