111 lines
3.5 KiB
C++
111 lines
3.5 KiB
C++
// Copyright (c) 2010-2025, Lawrence Livermore National Security, LLC. Produced
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// at the Lawrence Livermore National Laboratory. All Rights reserved. See files
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// LICENSE and NOTICE for details. LLNL-CODE-806117.
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//
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// This file is part of the MFEM library. For more information and source code
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// availability visit https://mfem.org.
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//
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// MFEM is free software; you can redistribute it and/or modify it under the
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// terms of the BSD-3 license. We welcome feedback and contributions, see file
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// CONTRIBUTING.md for details.
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#ifndef MFEM_TRIANGLE
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#define MFEM_TRIANGLE
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#include "../config/config.hpp"
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#include "../fem/fe.hpp"
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#include "element.hpp"
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namespace mfem
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{
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/// Data type triangle element
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class Triangle : public Element
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{
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protected:
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int indices[3];
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unsigned transform;
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public:
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typedef Geometry::Constants<Geometry::TRIANGLE> geom_t;
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Triangle() : Element(Geometry::TRIANGLE) { transform = 0; }
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/// Constructs triangle by specifying the indices and the attribute.
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Triangle(const int *ind, int attr = 1);
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/// Constructs triangle by specifying the indices and the attribute.
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Triangle(int ind1, int ind2, int ind3, int attr = 1);
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/// Return element's type.
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Type GetType() const override { return Element::TRIANGLE; }
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/// Return 1 if the element needs refinement in order to get conforming mesh.
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int NeedRefinement(HashTable<Hashed2> &v_to_v) const override;
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/** Reorder the vertices so that the longest edge is from vertex 0
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to vertex 1. If called it should be once from the mesh constructor,
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because the order may be used later for setting the edges. **/
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void MarkEdge(DenseMatrix & pmat);
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static void MarkEdge(int *indices, const DSTable &v_to_v, const int *length);
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/// Mark the longest edge by assuming/changing the order of the vertices.
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void MarkEdge(const DSTable &v_to_v, const int *length) override
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{ MarkEdge(indices, v_to_v, length); }
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void ResetTransform(int tr) override { transform = tr; }
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unsigned GetTransform() const override { return transform; }
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/// Add 'tr' to the current chain of coarse-fine transformations.
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void PushTransform(int tr) override
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{ transform = (transform << 3) | (tr + 1); }
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/// Calculate point matrix corresponding to a chain of transformations.
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static void GetPointMatrix(unsigned transform, DenseMatrix &pm);
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/// Get the indices defining the vertices.
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void GetVertices(Array<int> &v) const override;
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/// Set the indices defining the vertices.
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void SetVertices(const Array<int> &v) override;
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/// @note The returned array should NOT be deleted by the caller.
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int * GetVertices () override { return indices; }
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/// Set the indices defining the vertices.
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void SetVertices(const int *ind) override;
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int GetNVertices() const override { return 3; }
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int GetNEdges() const override { return (3); }
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const int *GetEdgeVertices(int ei) const override
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{ return geom_t::Edges[ei]; }
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/// @deprecated Use GetNFaces(void) and GetNFaceVertices(int) instead.
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MFEM_DEPRECATED int GetNFaces(int &nFaceVertices) const override
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{ nFaceVertices = 0; return 0; }
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int GetNFaces() const override { return 0; }
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int GetNFaceVertices(int) const override { return 0; }
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const int *GetFaceVertices(int fi) const override
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{ MFEM_ABORT("not implemented"); return NULL; }
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Element *Duplicate(Mesh *m) const override
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{ return new Triangle(indices, attribute); }
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virtual ~Triangle() = default;
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};
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// Defined in fe.cpp to ensure construction before 'mfem::Geometries'.
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extern MFEM_EXPORT Linear2DFiniteElement TriangleFE;
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}
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#endif
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