triangle.hpp

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// Copyright (c) 2010, Lawrence Livermore National Security, LLC. Produced at
// the Lawrence Livermore National Laboratory. LLNL-CODE-443211. All Rights
// reserved. See file COPYRIGHT for details.
//
// This file is part of the MFEM library. For more information and source code
// availability see http://mfem.googlecode.com.
//
// MFEM is free software; you can redistribute it and/or modify it under the
// terms of the GNU Lesser General Public License (as published by the Free
// Software Foundation) version 2.1 dated February 1999.

#ifndef MFEM_TRIANGLE
#define MFEM_TRIANGLE

class Triangle : public Element
{
protected:
   int indices[3];
   static const int edges[3][2];

public:

   Triangle() : Element(Geometry::TRIANGLE) { }

   Triangle(const int *ind, int attr = 1);

   Triangle(int ind1, int ind2, int ind3, int attr = 1);

   int NeedRefinement(DSTable &v_to_v, int *middle) const;

   virtual void SetVertices(const int *ind);

   virtual void MarkEdge(DenseMatrix & pmat);

   virtual void MarkEdge(const DSTable &v_to_v, const int *length);

   virtual int GetType() const { return Element::TRIANGLE; }

   virtual void GetVertices(Array<int> &v) const;

   virtual int *GetVertices() { return indices; }

   virtual int GetNVertices() const { return 3; }

   virtual int GetNEdges() const { return(3); }

   virtual const int *GetEdgeVertices(int ei) const { return(edges[ei]); }

   virtual Element *Duplicate(Mesh *m) const
   { return new Triangle(indices, attribute); }

   virtual ~Triangle() { }
};

extern Linear2DFiniteElement TriangleFE;

#endif