Dune::YGridComponent< Coordinates > Class Template Reference

#include <dune/grid/yaspgrid/ygrid.hh>

Classes
class	Iterator

Public Member Functions
	YGridComponent ()
	make uninitialized ygrid
	YGridComponent (iTupel origin, iTupel size)
	make ygrid without coordinate information More...
	YGridComponent (iTupel origin, iTupel size, const YGridComponent< Coordinates > &enclosing)
	make a subgrid by taking coordinates from a larger grid More...
	YGridComponent (iTupel origin, std::bitset< d > shift, Coordinates *coords, iTupel size, iTupel offset, iTupel supersize)
	Make YGridComponent by giving all parameters. More...
int	origin (int i) const
	Return origin in direction i.
const iTupel &	origin () const
	return reference to origin
bool	shift (int i) const
	Return shift in direction i.
const std::bitset< d > &	shift () const
	Return shift tupel.
int	offset (int i) const
	Return offset to origin of enclosing grid.
const iTupel &	offset () const
	Return offset to origin of enclosing grid.
int	supersize (int i) const
	return size of enclosing grid
const iTupel &	supersize () const
	return size of enclosing grid
int	size (int i) const
	return size in direction i
iTupel	size () const
	retrun size
int	totalsize () const
	Return total size of index set which is the product of all size per direction.
int	min (int i) const
	Return minimum index in direction i.
int	max (int i) const
	Return maximum index in direction i.
bool	empty () const
	Return true if YGrid is empty, i.e. has size 0 in all directions.
bool	inside (const iTupel &coord) const
	given a coordinate, return true if it is in the grid
int	index (const iTupel &coord) const
	given a tupel compute its index in the lexicographic numbering
YGridComponent< Coordinates >	move (iTupel v) const
	return grid moved by the vector v
YGridComponent< Coordinates >	intersection (const YGridComponent< Coordinates > &r) const
	Return YGridComponent of supergrid of self which is the intersection of self and another YGridComponent.
Iterator	begin () const
	return iterator to first element of index set
Iterator	begin (const iTupel &co) const
	return iterator to given element of index set
Iterator	end () const
	return subiterator to last element of index set

Detailed Description

template<class Coordinates>
class Dune::YGridComponent< Coordinates >

The YGrid considered here describes a finite set \(d\)-tupels of the form

\[ G = \{ (k_0,\ldots,k_{d-1}) | o_i \leq k_i < o_i+s_i \} \]

together with an affine mapping.

A YGrid is characterized by the following quantities:

• The origin \( o=(o_0,\ldots,o_{d-1}) \in Z^d\),
• the size \( s=(s_0,\ldots,s_{d-1}) \in Z^d\),
• The shift \( r=(r_0,\ldots,r_{d-1}) \in R^d\).
• a coordinate container, that gives the mapping of the index to global coordinates (see coordinates.hh)

The shift can be used to interpret the points of a grid as midpoints of cells, faces, edges, etc.

Here is a graphical illustration of a grid:

A YGrid.

A YGrid allows to iterate over all its cells with an Iterator class.

A YGrid is always considered as being embedded in a larger grid. This embedding is characterized by an offset and an enclosing grid as shown in the following picture:

The SubYGrid is shown in red, blue is the enclosing grid.

The iterator provides also a mapping to the consecutive index in the enclosing grid.

Note: as of november 2013 there are only YGrid and YGrid::Iterator. These represent the functionality of former SubYGrid and SubYGrid::TransformingSubIterator. All other classes in the hierarchy have not been used.

Constructor & Destructor Documentation

YGridComponent() [1/3]

template<class Coordinates >

Dune::YGridComponent< Coordinates >::YGridComponent ( iTupel  origin, iTupel  size  )

inline

make ygrid without coordinate information

Parameters

origin	origin of the grid in global coordinates
size	size of the grid Such grid has no coordinate information stored but can be used to determine an intersection with a grid with coordinate information. This avoids sending coordinates in the parallel case.

YGridComponent() [2/3]

template<class Coordinates >

Dune::YGridComponent< Coordinates >::YGridComponent ( iTupel  origin, iTupel  size, const YGridComponent< Coordinates > &  enclosing  )

inline

make a subgrid by taking coordinates from a larger grid

Parameters

origin	origin of the grid to be constructed
size	size of the grid to be constructed
enclosing	the grid to take coordinates and shift vector from

References Dune::YGridComponent< Coordinates >::offset(), and Dune::YGridComponent< Coordinates >::origin().

YGridComponent() [3/3]

template<class Coordinates >

Dune::YGridComponent< Coordinates >::YGridComponent ( iTupel  origin, std::bitset< d >  shift, Coordinates *  coords, iTupel  size, iTupel  offset, iTupel  supersize  )

inline

Make YGridComponent by giving all parameters.

Parameters

origin	the origin of the grid in global coordinates
shift	the shift vector
coords	the coordinate vectors to be used
size	the size vector
offset	the offset in the enclosing grid
supersize	size of the enclosing grid

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The documentation for this class was generated from the following file:

• dune/grid/yaspgrid/ygrid.hh