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demo a MeshlessInterpolationFunction in miscellaneous_ex8.C
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examples/miscellaneous/miscellaneous_ex8/meshless_interpolation_function.h
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| // The libMesh Finite Element Library. | ||
| // Copyright (C) 2002-2012 Benjamin S. Kirk, John W. Peterson, Roy H. Stogner | ||
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| // This library 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; either | ||
| // version 2.1 of the License, or (at your option) any later version. | ||
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| // This library 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 | ||
| // Lesser General Public License for more details. | ||
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| // You should have received a copy of the GNU Lesser General Public | ||
| // License along with this library; if not, write to the Free Software | ||
| // Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | ||
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| #ifndef LIBMESH_MESHLESS_INTERPOLATION_FUNCTION_H | ||
| #define LIBMESH_MESHLESS_INTERPOLATION_FUNCTION_H | ||
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| // Local Includes | ||
| #include "libmesh/function_base.h" | ||
| #include "libmesh/meshfree_interpolation.h" | ||
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| // C++ includes | ||
| #include <cstddef> | ||
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| namespace libMesh | ||
| { | ||
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| // Forward Declarations | ||
| template <typename T> | ||
| class DenseVector; | ||
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| // ------------------------------------------------------------ | ||
| // MeshlessInterpolationFunction class definition | ||
| class MeshlessInterpolationFunction : public FunctionBase<Number> | ||
| { | ||
| private: | ||
| const MeshfreeInterpolation &_mfi; | ||
| mutable std::vector<Point> _pts; | ||
| mutable std::vector<Number> _vals; | ||
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| public: | ||
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| /** | ||
| * Constructor. Requires a \p \pMeshlessInterpolation object. | ||
| */ | ||
| MeshlessInterpolationFunction (const MeshfreeInterpolation &mfi) : | ||
| _mfi (mfi) | ||
| {} | ||
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| /** | ||
| * The actual initialization process. | ||
| */ | ||
| void init (); | ||
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| /** | ||
| * Clears the function. | ||
| */ | ||
| void clear (); | ||
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| /** | ||
| * Returns a new deep copy of the function. | ||
| */ | ||
| virtual AutoPtr<FunctionBase<Number> > clone () const; | ||
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| /** | ||
| * @returns the value at point \p p and time | ||
| * \p time, which defaults to zero. | ||
| */ | ||
| Number operator() (const Point& p, | ||
| const Real time=0.); | ||
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| /** | ||
| * Like before, but returns the values in a | ||
| * writable reference. | ||
| */ | ||
| void operator() (const Point& p, | ||
| const Real time, | ||
| DenseVector<Number>& output); | ||
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| }; | ||
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| // ------------------------------------------------------------ | ||
| // MeshlessInterpolationFunction inline methods | ||
| inline | ||
| Number MeshlessInterpolationFunction::operator() (const Point& p, | ||
| const Real /* time */) | ||
| { | ||
| _pts.clear(); | ||
| _pts.push_back(p); | ||
| _vals.resize(1); | ||
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| _mfi.interpolate_field_data (_mfi.field_variables(), | ||
| _pts, _vals); | ||
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| return _vals.front(); | ||
| } | ||
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| inline | ||
| void MeshlessInterpolationFunction::operator() (const Point& p, | ||
| const Real time, | ||
| DenseVector<Number>& output) | ||
| { | ||
| output.resize(1); | ||
| output(0) = (*this)(p,time); | ||
| return; | ||
| } | ||
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| inline | ||
| void MeshlessInterpolationFunction::init () | ||
| { | ||
| } | ||
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| inline | ||
| void MeshlessInterpolationFunction::clear () | ||
| { | ||
| } | ||
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| inline | ||
| AutoPtr<FunctionBase<Number> > | ||
| MeshlessInterpolationFunction::clone () const | ||
| { | ||
| return AutoPtr<FunctionBase<Number> > (new MeshlessInterpolationFunction (_mfi) ); | ||
| } | ||
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| } // namespace libMesh | ||
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| #endif // LIBMESH_MESHLESS_INTERPOLATION_FUNCTION_H | ||
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