segment.hpp

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// Copyright (c) 2010-2024, Lawrence Livermore National Security, LLC. Produced
// at the Lawrence Livermore National Laboratory. All Rights reserved. See files
// LICENSE and NOTICE for details. LLNL-CODE-806117.
//
// This file is part of the MFEM library. For more information and source code
// availability visit https://mfem.org.
//
// MFEM is free software; you can redistribute it and/or modify it under the
// terms of the BSD-3 license. We welcome feedback and contributions, see file
// CONTRIBUTING.md for details.
 
#ifndef MFEM_SEGMENT
#define MFEM_SEGMENT
 
#include "../config/config.hpp"
#include "element.hpp"
 
namespace mfem
{
 
/// Data type line segment element
class Segment : public Element
{
protected:
   int indices[2];
 
public:
   typedef Geometry::Constants<Geometry::SEGMENT> geom_t;
 
   Segment() : Element(Geometry::SEGMENT) {}
 
   /// Constructs triangle by specifying the indices and the attribute.
   Segment(const int *ind, int attr = 1);
 
   /// Constructs triangle by specifying the indices and the attribute.
   Segment(int ind1, int ind2, int attr = 1);
 
   /// Return element's type.
   Type GetType() const override { return Element::SEGMENT; }
 
   /// Get the indices defining the vertices.
   void GetVertices(Array<int> &v) const override;
 
   /// Set the indices defining the vertices.
   void SetVertices(const Array<int> &v) override;
 
   /// @note The returned array should NOT be deleted by the caller.
   int * GetVertices () override { return indices; }
 
   /// Set the indices defining the vertices.
   void SetVertices(const int *ind) override;
 
   int GetNVertices() const override { return 2; }
 
   int GetNEdges() const override { return 0; }
 
   const int *GetEdgeVertices(int ei) const override { return NULL; }
 
   /// @deprecated Use GetNFaces(void) and GetNFaceVertices(int) instead.
   MFEM_DEPRECATED int GetNFaces(int &nFaceVertices) const override
   { nFaceVertices = 0; return 0; }
 
   int GetNFaces() const override { return 0; }
 
   int GetNFaceVertices(int) const override { return 0; }
 
   const int *GetFaceVertices(int fi) const override { return NULL; }
 
   Element *Duplicate(Mesh *m) const override
   { return new Segment(indices, attribute); }
 
   virtual ~Segment() = default;
};
 
class Linear1DFiniteElement;
extern MFEM_EXPORT Linear1DFiniteElement SegmentFE;
 
}
 
#endif