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// $Id: data_out_faces.h 31076 2013-10-02 17:52:30Z heister $
//
// Copyright (C) 2000 - 2013 by the deal.II authors
//
// This file is part of the deal.II library.
//
// The deal.II library is free software; you can use it, 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.
// The full text of the license can be found in the file LICENSE at
// the top level of the deal.II distribution.
//
// ---------------------------------------------------------------------
#ifndef __deal2__data_out_faces_h
#define __deal2__data_out_faces_h
#include <deal.II/base/config.h>
#include <deal.II/numerics/data_out.h>
#include <string>
#include <vector>
DEAL_II_NAMESPACE_OPEN
namespace internal
{
namespace DataOutFaces
{
/**
* A derived class for use in the
* DataOutFaces class. This is
* a class for the
* AdditionalData kind of data
* structure discussed in the
* documentation of the
* WorkStream context.
*/
template <int dim, int spacedim>
struct ParallelData : public internal::DataOut::ParallelDataBase<dim,spacedim>
{
ParallelData (const unsigned int n_datasets,
const unsigned int n_subdivisions,
const std::vector<unsigned int> &n_postprocessor_outputs,
const Mapping<dim,spacedim> &mapping,
const std::vector<std_cxx1x::shared_ptr<dealii::hp::FECollection<dim,spacedim> > > &finite_elements,
const UpdateFlags update_flags);
std::vector<Point<dim> > patch_normals;
std::vector<Point<spacedim> > patch_evaluation_points;
};
}
}
/**
* This class generates output from faces of a triangulation. It might
* be used to generate output only for the surface of the
* triangulation (this is the default of this class), or for all faces
* of active cells, as specified in the constructor.
* The output of this class is a set of
* patches (as defined by the class DataOutBase::Patch()), one for
* each face for which output is to be generated. These patches can
* then be written in several graphical data formats by the functions
* of the underlying classes.
*
* <h3>Interface</h3>
*
* The interface of this class is copied from the DataOut
* class. Furthermore, they share the common parent class
* DataOut_DoFData. See the reference of these two classes for a
* discussion of the interface.
*
*
* <h3>Extending this class</h3>
*
* The sequence of faces to generate patches from is generated in the
* same way as in the DataOut class; see there for a description of
* the respective interface. The functions generating the sequence of
* faces which shall be used to generate output, are called
* first_face() and next_face().
*
* Since we need to initialize objects of type FEValues with the
* faces generated from these functions, it is not sufficient that
* they only return face iterators. Rather, we need a pair of cell and
* the number of the face, as the values of finite element fields need
* not necessarily be unique on a face (think of discontinuous finite
* elements, where the value of the finite element field depend on the
* direction from which you approach a face, thus it is necessary to
* use a pair of cell and face, rather than only a face
* iterator). Therefore, this class defines a @p typedef which
* creates a type @p FaceDescriptor that is an abbreviation for a
* pair of cell iterator and face number. The functions @p first_face
* and @p next_face operate on objects of this type.
*
* Extending this class might, for example, be useful if you only want
* output from certain portions of the boundary, e.g. as indicated by
* the boundary indicator of the respective faces. However, it is also
* conceivable that one generates patches not from boundary faces, but
* from interior faces that are selected due to other criteria; one
* application might be to use only those faces where one component of
* the solution attains a certain value, in order to display the
* values of other solution components on these faces. Other
* applications certainly exist, for which the author is not
* imaginative enough.
*
* @todo Reimplement this whole class using actual FEFaceValues and MeshWorker.
*
* @ingroup output
* @author Wolfgang Bangerth, Guido Kanschat, 2000, 2011
*/
template <int dim, class DH=DoFHandler<dim> >
class DataOutFaces : public DataOut_DoFData<DH,DH::dimension-1,
DH::dimension>
{
public:
/**
* Typedef to the iterator type
* of the dof handler class under
* consideration.
*/
typedef typename DataOut_DoFData<DH,DH::dimension-1,
DH::dimension>::cell_iterator cell_iterator;
/**
* Constructor determining
* whether a surface mesh
* (default) or the whole wire
* basket is written.
*/
DataOutFaces (const bool surface_only = true);
/**
* This is the central function
* of this class since it builds
* the list of patches to be
* written by the low-level
* functions of the base
* class. See the general
* documentation of this class
* for further information.
*
* The function supports
* multithreading, if deal.II is
* compiled in multithreading
* mode.
*/
virtual void
build_patches (const unsigned int n_subdivisions = 0);
/**
* Same as above, except that the
* additional first parameter
* defines a mapping that is to
* be used in the generation of
* output. If
* <tt>n_subdivisions>1</tt>, the
* points interior of subdivided
* patches which originate from
* cells at the boundary of the
* domain can be computed using the
* mapping, i.e. a higher order
* mapping leads to a
* representation of a curved
* boundary by using more
* subdivisions.
*
* Even for non-curved cells the
* mapping argument can be used
* for the Eulerian mappings (see
* class MappingQ1Eulerian) where
* a mapping is used not only to
* determine the position of
* points interior to a cell, but
* also of the vertices. It
* offers an opportunity to watch
* the solution on a deformed
* triangulation on which the
* computation was actually
* carried out, even if the mesh
* is internally stored in its
* undeformed configuration and
* the deformation is only
* tracked by an additional
* vector that holds the
* deformation of each vertex.
*
* @todo The @p mapping argument should be
* replaced by a hp::MappingCollection in
* case of a hp::DoFHandler.
*/
virtual void build_patches (const Mapping<DH::dimension> &mapping,
const unsigned int n_subdivisions = 0);
/**
* Declare a way to describe a
* face which we would like to
* generate output for. The usual
* way would, of course, be to
* use an object of type
* <tt>DoFHandler<dim>::face_iterator</tt>,
* but since we have to describe
* faces to objects of type
* FEValues, we can only
* represent faces by pairs of a
* cell and the number of the
* face. This pair is here
* aliased to a name that is
* better to type.
*/
typedef typename std::pair<cell_iterator,unsigned int> FaceDescriptor;
/**
* Return the first face which we
* want output for. The default
* implementation returns the
* first face of an active cell
* or the first such on the
* boundary.
*
* For more general sets,
* overload this function in a
* derived class.
*/
virtual FaceDescriptor first_face ();
/**
* Return the next face after
* which we want output
* for. If there are no more
* faces, <tt>dofs->end()</tt> is
* returned as the first
* component of the return value.
*
* The default implementation
* returns the next face of an
* active cell, or the next such
* on the boundary.
*
* This function traverses the
* mesh cell by cell (active
* only), and then through all
* faces of the cell. As a
* result, interior faces are
* output twice.
* This function can be
* overloaded in a derived
* class to select a different
* set of faces. Note that the
* default implementation assumes
* that the given @p face is
* active, which is guaranteed as
* long as first_face() is also
* used from the default
* implementation. Overloading
* only one of the two functions
* should be done with care.
*/
virtual FaceDescriptor next_face (const FaceDescriptor &face);
/**
* Exception
*/
DeclException1 (ExcInvalidNumberOfSubdivisions,
int,
<< "The number of subdivisions per patch, " << arg1
<< ", is not valid.");
/**
* Exception
*/
DeclException0 (ExcCellNotActiveForCellData);
private:
/**
* Parameter deciding between
* surface meshes and full wire
* basket.
*/
const bool surface_only;
/**
* Build one patch. This function
* is called in a WorkStream
* context.
*/
void build_one_patch (const FaceDescriptor *cell_and_face,
internal::DataOutFaces::ParallelData<DH::dimension, DH::dimension> &data,
DataOutBase::Patch<DH::dimension-1,DH::space_dimension> &patch);
};
DEAL_II_NAMESPACE_CLOSE
#endif
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