WachspressCoord.hpp

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/*
  Copyright 2012 SINTEF ICT, Applied Mathematics.
 
  This file is part of the Open Porous Media project (OPM).
 
  OPM 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 3 of the License, or
  (at your option) any later version.
 
  OPM 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 OPM.  If not, see <http://www.gnu.org/licenses/>.
*/
 
#ifndef OPM_WACHSPRESSCOORD_HEADER_INCLUDED
#define OPM_WACHSPRESSCOORD_HEADER_INCLUDED
 
#include <opm/grid/utility/SparseTable.hpp>
#include <vector>
 
struct UnstructuredGrid;
 
namespace Opm
{
 
    class WachspressCoord
    {
    public:
        explicit WachspressCoord(const UnstructuredGrid& grid);
 
        int numCorners(const int cell) const;
 
        void cartToBary(const int cell,
                        const double* x,
                        double* xb) const;
 
        // A corner is here defined as a {cell, vertex} pair where the
        // vertex is adjacent to the cell.
        struct CornerInfo
        {
            int corner_id;         // Unique for each corner.
            int vertex;            // Shared between corners belonging to different cells.
            double volume;         // Defined as det(N) where N is the matrix of adjacent face normals.
        };
 
        const SparseTable<CornerInfo>& cornerInfo() const;
 
        const std::vector<int>& adjacentFaces() const;
 
    private:
        const UnstructuredGrid& grid_;
        SparseTable<CornerInfo> corner_info_;   // Corner info by cell.
        std::vector<int> adj_faces_;    // Set of adjacent faces, by corner id. Contains dim face indices per corner.
        SparseTable<int> nonadj_faces_; // Set of nonadjacent faces, by corner id.
    };
 
} // namespace Opm
 
#endif // OPM_WACHSPRESSCOORD_HEADER_INCLUDED