cell represents a parabolic, isoparametric edge More...

#include <vtkQuadraticEdge.h>

Inheritance diagram for vtkQuadraticEdge:

Collaboration diagram for vtkQuadraticEdge:

Public Types
typedef vtkNonLinearCell	Superclass

Public Types inherited from vtkNonLinearCell
typedef vtkCell	Superclass

Public Types inherited from vtkCell
typedef vtkObject	Superclass

Public Member Functions
virtual vtkTypeBool	IsA (const char *type)
	Return 1 if this class is the same type of (or a subclass of) the named class. More...

vtkQuadraticEdge *	NewInstance () const

void	PrintSelf (ostream &os, vtkIndent indent) override
	Methods invoked by print to print information about the object including superclasses. More...

int	GetCellType () override
	Implement the vtkCell API. More...

int	GetCellDimension () override
	Return the topological dimensional of the cell (0,1,2, or 3). More...

int	GetNumberOfEdges () override
	Return the number of edges in the cell. More...

int	GetNumberOfFaces () override
	Return the number of faces in the cell. More...

vtkCell *	GetEdge (int) override
	Return the edge cell from the edgeId of the cell. More...

vtkCell *	GetFace (int) override
	Return the face cell from the faceId of the cell. More...

int	CellBoundary (int subId, const double pcoords[3], vtkIdList *pts) override
	Given parametric coordinates of a point, return the closest cell boundary, and whether the point is inside or outside of the cell. More...

void	Contour (double value, vtkDataArray cellScalars, vtkIncrementalPointLocator locator, vtkCellArray verts, vtkCellArray lines, vtkCellArray polys, vtkPointData inPd, vtkPointData outPd, vtkCellData inCd, vtkIdType cellId, vtkCellData *outCd) override
	Generate contouring primitives. More...

int	EvaluatePosition (const double x[3], double closestPoint[3], int &subId, double pcoords[3], double &dist2, double weights[]) override
	Given a point x[3] return inside(=1), outside(=0) cell, or (-1) computational problem encountered; evaluate parametric coordinates, sub-cell id (!=0 only if cell is composite), distance squared of point x[3] to cell (in particular, the sub-cell indicated), closest point on cell to x[3] (unless closestPoint is null, in which case, the closest point and dist2 are not found), and interpolation weights in cell. More...

void	EvaluateLocation (int &subId, const double pcoords[3], double x[3], double *weights) override
	Determine global coordinate (x[3]) from subId and parametric coordinates. More...

int	Triangulate (int index, vtkIdList ptIds, vtkPoints pts) override
	Generate simplices of proper dimension. More...

void	Derivatives (int subId, const double pcoords[3], const double values, int dim, double derivs) override
	Compute derivatives given cell subId and parametric coordinates. More...

double *	GetParametricCoords () override
	Return a contiguous array of parametric coordinates of the points defining this cell. More...

void	Clip (double value, vtkDataArray cellScalars, vtkIncrementalPointLocator locator, vtkCellArray lines, vtkPointData inPd, vtkPointData outPd, vtkCellData inCd, vtkIdType cellId, vtkCellData *outCd, int insideOut) override
	Clip this edge using scalar value provided. More...

int	IntersectWithLine (const double p1[3], const double p2[3], double tol, double &t, double x[3], double pcoords[3], int &subId) override
	Line-edge intersection. More...

int	GetParametricCenter (double pcoords[3]) override
	Return the center of the quadratic tetra in parametric coordinates. More...


void	InterpolateFunctions (const double pcoords[3], double weights[3]) override
	Compute the interpolation functions/derivatives (aka shape functions/derivatives) More...

void	InterpolateDerivs (const double pcoords[3], double derivs[3]) override
	Compute the interpolation functions/derivatives (aka shape functions/derivatives) More...

Public Member Functions inherited from vtkNonLinearCell
vtkNonLinearCell *	NewInstance () const

int	IsLinear () override
	Non-linear cells require special treatment (tessellation) when converting to graphics primitives (during mapping). More...

Public Member Functions inherited from vtkCell
vtkCell *	NewInstance () const

void	Initialize (int npts, vtkIdType pts, vtkPoints p)
	Initialize cell from outside with point ids and point coordinates specified. More...

void	Initialize (int npts, vtkPoints *p)
	Initialize the cell with point coordinates specified. More...

virtual void	ShallowCopy (vtkCell *c)
	Copy this cell by reference counting the internal data structures. More...

virtual void	DeepCopy (vtkCell *c)
	Copy this cell by completely copying internal data structures. More...

virtual int	RequiresInitialization ()
	Some cells require initialization prior to access. More...

virtual void	Initialize ()

virtual int	IsExplicitCell ()
	Explicit cells require additional representational information beyond the usual cell type and connectivity list information. More...

virtual int	RequiresExplicitFaceRepresentation ()
	Determine whether the cell requires explicit face representation, and methods for setting and getting the faces (see vtkPolyhedron for example usage of these methods). More...

virtual void	SetFaces (vtkIdType *vtkNotUsed(faces))

virtual vtkIdType *	GetFaces ()

vtkPoints *	GetPoints ()
	Get the point coordinates for the cell. More...

vtkIdType	GetNumberOfPoints ()
	Return the number of points in the cell. More...

vtkIdList *	GetPointIds ()
	Return the list of point ids defining the cell. More...

vtkIdType	GetPointId (int ptId)
	For cell point i, return the actual point id. More...

void	GetBounds (double bounds[6])
	Compute cell bounding box (xmin,xmax,ymin,ymax,zmin,zmax). More...

double *	GetBounds ()
	Compute cell bounding box (xmin,xmax,ymin,ymax,zmin,zmax). More...

double	GetLength2 ()
	Compute Length squared of cell (i.e., bounding box diagonal squared). More...

virtual double	GetParametricDistance (const double pcoords[3])
	Return the distance of the parametric coordinate provided to the cell. More...

virtual int	IsPrimaryCell ()
	Return whether this cell type has a fixed topology or whether the topology varies depending on the data (e.g., vtkConvexPointSet). More...

virtual void	InterpolateFunctions (const double vtkNotUsed(pcoords)[3], double *vtkNotUsed(weight))
	Compute the interpolation functions/derivatives (aka shape functions/derivatives) No-ops at this level. More...

virtual void	InterpolateDerivs (const double vtkNotUsed(pcoords)[3], double *vtkNotUsed(derivs))

Public Member Functions inherited from vtkObject
	vtkBaseTypeMacro (vtkObject, vtkObjectBase)

virtual void	DebugOn ()
	Turn debugging output on. More...

virtual void	DebugOff ()
	Turn debugging output off. More...

bool	GetDebug ()
	Get the value of the debug flag. More...

void	SetDebug (bool debugFlag)
	Set the value of the debug flag. More...

virtual void	Modified ()
	Update the modification time for this object. More...

virtual vtkMTimeType	GetMTime ()
	Return this object's modified time. More...

void	RemoveObserver (unsigned long tag)

void	RemoveObservers (unsigned long event)

void	RemoveObservers (const char *event)

void	RemoveAllObservers ()

vtkTypeBool	HasObserver (unsigned long event)

vtkTypeBool	HasObserver (const char *event)

int	InvokeEvent (unsigned long event)

int	InvokeEvent (const char *event)

unsigned long	AddObserver (unsigned long event, vtkCommand *, float priority=0.0f)
	Allow people to add/remove/invoke observers (callbacks) to any VTK object. More...

unsigned long	AddObserver (const char event, vtkCommand , float priority=0.0f)
	Allow people to add/remove/invoke observers (callbacks) to any VTK object. More...

vtkCommand *	GetCommand (unsigned long tag)
	Allow people to add/remove/invoke observers (callbacks) to any VTK object. More...

void	RemoveObserver (vtkCommand *)
	Allow people to add/remove/invoke observers (callbacks) to any VTK object. More...

void	RemoveObservers (unsigned long event, vtkCommand *)
	Allow people to add/remove/invoke observers (callbacks) to any VTK object. More...

void	RemoveObservers (const char event, vtkCommand )
	Allow people to add/remove/invoke observers (callbacks) to any VTK object. More...

vtkTypeBool	HasObserver (unsigned long event, vtkCommand *)
	Allow people to add/remove/invoke observers (callbacks) to any VTK object. More...

vtkTypeBool	HasObserver (const char event, vtkCommand )
	Allow people to add/remove/invoke observers (callbacks) to any VTK object. More...

template<class U , class T >
unsigned long	AddObserver (unsigned long event, U observer, void(T::*callback)(), float priority=0.0f)
	Overloads to AddObserver that allow developers to add class member functions as callbacks for events. More...

template<class U , class T >
unsigned long	AddObserver (unsigned long event, U observer, void(T::callback)(vtkObject , unsigned long, void *), float priority=0.0f)
	Overloads to AddObserver that allow developers to add class member functions as callbacks for events. More...

template<class U , class T >
unsigned long	AddObserver (unsigned long event, U observer, bool(T::callback)(vtkObject , unsigned long, void *), float priority=0.0f)
	Allow user to set the AbortFlagOn() with the return value of the callback method. More...

int	InvokeEvent (unsigned long event, void *callData)
	This method invokes an event and return whether the event was aborted or not. More...

int	InvokeEvent (const char event, void callData)
	This method invokes an event and return whether the event was aborted or not. More...

Public Member Functions inherited from vtkObjectBase
const char *	GetClassName () const
	Return the class name as a string. More...

virtual void	Delete ()
	Delete a VTK object. More...

virtual void	FastDelete ()
	Delete a reference to this object. More...

void	InitializeObjectBase ()

void	Print (ostream &os)
	Print an object to an ostream. More...

virtual void	Register (vtkObjectBase *o)
	Increase the reference count (mark as used by another object). More...

virtual void	UnRegister (vtkObjectBase *o)
	Decrease the reference count (release by another object). More...

int	GetReferenceCount ()
	Return the current reference count of this object. More...

void	SetReferenceCount (int)
	Sets the reference count. More...

void	PrintRevisions (ostream &)
	Legacy. More...

virtual void	PrintHeader (ostream &os, vtkIndent indent)
	Methods invoked by print to print information about the object including superclasses. More...

virtual void	PrintTrailer (ostream &os, vtkIndent indent)
	Methods invoked by print to print information about the object including superclasses. More...

Static Public Member Functions
static vtkQuadraticEdge *	New ()

static vtkTypeBool	IsTypeOf (const char *type)

static vtkQuadraticEdge *	SafeDownCast (vtkObjectBase *o)

static void	InterpolationFunctions (const double pcoords[3], double weights[3])

static void	InterpolationDerivs (const double pcoords[3], double derivs[3])

Static Public Member Functions inherited from vtkNonLinearCell
static vtkTypeBool	IsTypeOf (const char *type)

static vtkNonLinearCell *	SafeDownCast (vtkObjectBase *o)

Static Public Member Functions inherited from vtkCell
static vtkTypeBool	IsTypeOf (const char *type)

static vtkCell *	SafeDownCast (vtkObjectBase *o)

Static Public Member Functions inherited from vtkObject
static vtkObject *	New ()
	Create an object with Debug turned off, modified time initialized to zero, and reference counting on. More...

static void	BreakOnError ()
	This method is called when vtkErrorMacro executes. More...

static void	SetGlobalWarningDisplay (int val)
	This is a global flag that controls whether any debug, warning or error messages are displayed. More...

static void	GlobalWarningDisplayOn ()
	This is a global flag that controls whether any debug, warning or error messages are displayed. More...

static void	GlobalWarningDisplayOff ()
	This is a global flag that controls whether any debug, warning or error messages are displayed. More...

static int	GetGlobalWarningDisplay ()
	This is a global flag that controls whether any debug, warning or error messages are displayed. More...

Static Public Member Functions inherited from vtkObjectBase
static vtkTypeBool	IsTypeOf (const char *name)
	Return 1 if this class type is the same type of (or a subclass of) the named class. More...

static vtkObjectBase *	New ()
	Create an object with Debug turned off, modified time initialized to zero, and reference counting on. More...

Protected Member Functions
virtual vtkObjectBase *	NewInstanceInternal () const

	vtkQuadraticEdge ()

	~vtkQuadraticEdge () override

Protected Member Functions inherited from vtkNonLinearCell
	vtkNonLinearCell ()

	~vtkNonLinearCell () override

Protected Member Functions inherited from vtkCell
	vtkCell ()

	~vtkCell () override

Protected Member Functions inherited from vtkObject
	vtkObject ()

	~vtkObject () override

void	RegisterInternal (vtkObjectBase *, vtkTypeBool check) override

void	UnRegisterInternal (vtkObjectBase *, vtkTypeBool check) override

void	InternalGrabFocus (vtkCommand mouseEvents, vtkCommand keypressEvents=nullptr)
	These methods allow a command to exclusively grab all events. More...

void	InternalReleaseFocus ()
	These methods allow a command to exclusively grab all events. More...

Protected Member Functions inherited from vtkObjectBase
	vtkObjectBase ()

virtual	~vtkObjectBase ()

virtual void	CollectRevisions (ostream &)

virtual void	ReportReferences (vtkGarbageCollector *)

	vtkObjectBase (const vtkObjectBase &)

void	operator= (const vtkObjectBase &)

Protected Attributes
vtkLine *	Line

vtkDoubleArray *	Scalars

Protected Attributes inherited from vtkCell
double	Bounds [6]

Protected Attributes inherited from vtkObject
bool	Debug

vtkTimeStamp	MTime

vtkSubjectHelper *	SubjectHelper

Protected Attributes inherited from vtkObjectBase
vtkAtomicInt32	ReferenceCount

vtkWeakPointerBase **	WeakPointers

Additional Inherited Members
Public Attributes inherited from vtkCell
vtkPoints *	Points

vtkIdList *	PointIds

Detailed Description

cell represents a parabolic, isoparametric edge

vtkQuadraticEdge is a concrete implementation of vtkNonLinearCell to represent a one-dimensional, 3-nodes, isoparametric parabolic line. The interpolation is the standard finite element, quadratic isoparametric shape function. The cell includes a mid-edge node. The ordering of the three points defining the cell is point ids (0,1,2) where id #2 is the midedge node.

See also: vtkQuadraticTriangle vtkQuadraticTetra vtkQuadraticWedge vtkQuadraticQuad vtkQuadraticHexahedron vtkQuadraticPyramid

Tests:: vtkQuadraticEdge (Tests)

Definition at line 43 of file vtkQuadraticEdge.h.

Member Typedef Documentation

typedef vtkNonLinearCell vtkQuadraticEdge::Superclass

Definition at line 47 of file vtkQuadraticEdge.h.

Constructor & Destructor Documentation

vtkQuadraticEdge::vtkQuadraticEdge ( )

protected

vtkQuadraticEdge::~vtkQuadraticEdge ( )

overrideprotected

Member Function Documentation

static vtkQuadraticEdge* vtkQuadraticEdge::New ( )

static

static vtkTypeBool vtkQuadraticEdge::IsTypeOf ( const char * type )

static

virtual vtkTypeBool vtkQuadraticEdge::IsA ( const char * name )

virtual

Return 1 if this class is the same type of (or a subclass of) the named class.

Returns 0 otherwise. This method works in combination with vtkTypeMacro found in vtkSetGet.h.

Reimplemented from vtkNonLinearCell.

static vtkQuadraticEdge* vtkQuadraticEdge::SafeDownCast ( vtkObjectBase * o )

static

virtual vtkObjectBase* vtkQuadraticEdge::NewInstanceInternal ( ) const

protectedvirtual

Reimplemented from vtkNonLinearCell.

vtkQuadraticEdge* vtkQuadraticEdge::NewInstance ( ) const

void vtkQuadraticEdge::PrintSelf	(	ostream &	os,
		vtkIndent	indent
	)

overridevirtual

Methods invoked by print to print information about the object including superclasses.

Typically not called by the user (use Print() instead) but used in the hierarchical print process to combine the output of several classes.

Reimplemented from vtkNonLinearCell.

int vtkQuadraticEdge::GetCellType ( )

inlineoverridevirtual

Implement the vtkCell API.

See the vtkCell API for descriptions of these methods.

Implements vtkCell.

Definition at line 54 of file vtkQuadraticEdge.h.

int vtkQuadraticEdge::GetCellDimension ( )

inlineoverridevirtual

Return the topological dimensional of the cell (0,1,2, or 3).

Implements vtkCell.

Definition at line 55 of file vtkQuadraticEdge.h.

int vtkQuadraticEdge::GetNumberOfEdges ( )

inlineoverridevirtual

Return the number of edges in the cell.

Implements vtkCell.

Definition at line 56 of file vtkQuadraticEdge.h.

int vtkQuadraticEdge::GetNumberOfFaces ( )

inlineoverridevirtual

Return the number of faces in the cell.

Implements vtkCell.

Definition at line 57 of file vtkQuadraticEdge.h.

vtkCell* vtkQuadraticEdge::GetEdge ( int edgeId )

inlineoverridevirtual

Return the edge cell from the edgeId of the cell.

Implements vtkCell.

Definition at line 58 of file vtkQuadraticEdge.h.

vtkCell* vtkQuadraticEdge::GetFace ( int faceId )

inlineoverridevirtual

Return the face cell from the faceId of the cell.

Implements vtkCell.

Definition at line 59 of file vtkQuadraticEdge.h.

int vtkQuadraticEdge::CellBoundary	(	int	subId,
		const double	pcoords[3],
		vtkIdList *	pts
	)

overridevirtual

Given parametric coordinates of a point, return the closest cell boundary, and whether the point is inside or outside of the cell.

The cell boundary is defined by a list of points (pts) that specify a face (3D cell), edge (2D cell), or vertex (1D cell). If the return value of the method is != 0, then the point is inside the cell.

Implements vtkCell.

void vtkQuadraticEdge::Contour	(	double	value,
		vtkDataArray *	cellScalars,
		vtkIncrementalPointLocator *	locator,
		vtkCellArray *	verts,
		vtkCellArray *	lines,
		vtkCellArray *	polys,
		vtkPointData *	inPd,
		vtkPointData *	outPd,
		vtkCellData *	inCd,
		vtkIdType	cellId,
		vtkCellData *	outCd
	)

overridevirtual

Generate contouring primitives.

The scalar list cellScalars are scalar values at each cell point. The point locator is essentially a points list that merges points as they are inserted (i.e., prevents duplicates). Contouring primitives can be vertices, lines, or polygons. It is possible to interpolate point data along the edge by providing input and output point data - if outPd is nullptr, then no interpolation is performed. Also, if the output cell data is non-nullptr, the cell data from the contoured cell is passed to the generated contouring primitives. (Note: the CopyAllocate() method must be invoked on both the output cell and point data. The cellId refers to the cell from which the cell data is copied.)

Implements vtkCell.

int vtkQuadraticEdge::EvaluatePosition	(	const double	x[3],
		double	closestPoint[3],
		int &	subId,
		double	pcoords[3],
		double &	dist2,
		double	weights[]
	)

overridevirtual

Given a point x[3] return inside(=1), outside(=0) cell, or (-1) computational problem encountered; evaluate parametric coordinates, sub-cell id (!=0 only if cell is composite), distance squared of point x[3] to cell (in particular, the sub-cell indicated), closest point on cell to x[3] (unless closestPoint is null, in which case, the closest point and dist2 are not found), and interpolation weights in cell.

(The number of weights is equal to the number of points defining the cell). Note: on rare occasions a -1 is returned from the method. This means that numerical error has occurred and all data returned from this method should be ignored. Also, inside/outside is determine parametrically. That is, a point is inside if it satisfies parametric limits. This can cause problems for cells of topological dimension 2 or less, since a point in 3D can project onto the cell within parametric limits but be "far" from the cell. Thus the value dist2 may be checked to determine true in/out.

Implements vtkCell.

void vtkQuadraticEdge::EvaluateLocation	(	int &	subId,
		const double	pcoords[3],
		double	x[3],
		double *	weights
	)

overridevirtual

Determine global coordinate (x[3]) from subId and parametric coordinates.

Also returns interpolation weights. (The number of weights is equal to the number of points in the cell.)

Implements vtkCell.

int vtkQuadraticEdge::Triangulate	(	int	index,
		vtkIdList *	ptIds,
		vtkPoints *	pts
	)

overridevirtual

Generate simplices of proper dimension.

If cell is 3D, tetrahedron are generated; if 2D triangles; if 1D lines; if 0D points. The form of the output is a sequence of points, each n+1 points (where n is topological cell dimension) defining a simplex. The index is a parameter that controls which triangulation to use (if more than one is possible). If numerical degeneracy encountered, 0 is returned, otherwise 1 is returned. This method does not insert new points: all the points that define the simplices are the points that define the cell.

Implements vtkCell.

void vtkQuadraticEdge::Derivatives	(	int	subId,
		const double	pcoords[3],
		const double *	values,
		int	dim,
		double *	derivs
	)

overridevirtual

Compute derivatives given cell subId and parametric coordinates.

The values array is a series of data value(s) at the cell points. There is a one-to-one correspondence between cell point and data value(s). Dim is the number of data values per cell point. Derivs are derivatives in the x-y-z coordinate directions for each data value. Thus, if computing derivatives for a scalar function in a hexahedron, dim=1, 8 values are supplied, and 3 deriv values are returned (i.e., derivatives in x-y-z directions). On the other hand, if computing derivatives of velocity (vx,vy,vz) dim=3, 24 values are supplied ((vx,vy,vz)1, (vx,vy,vz)2, ....()8), and 9 deriv values are returned ((d(vx)/dx),(d(vx)/dy),(d(vx)/dz), (d(vy)/dx),(d(vy)/dy), (d(vy)/dz), (d(vz)/dx),(d(vz)/dy),(d(vz)/dz)).

Implements vtkCell.

double* vtkQuadraticEdge::GetParametricCoords ( )

overridevirtual

Return a contiguous array of parametric coordinates of the points defining this cell.

In other words, (px,py,pz, px,py,pz, etc..) The coordinates are ordered consistent with the definition of the point ordering for the cell. This method returns a non-nullptr pointer when the cell is a primary type (i.e., IsPrimaryCell() is true). Note that 3D parametric coordinates are returned no matter what the topological dimension of the cell.

Reimplemented from vtkCell.

void vtkQuadraticEdge::Clip	(	double	value,
		vtkDataArray *	cellScalars,
		vtkIncrementalPointLocator *	locator,
		vtkCellArray *	lines,
		vtkPointData *	inPd,
		vtkPointData *	outPd,
		vtkCellData *	inCd,
		vtkIdType	cellId,
		vtkCellData *	outCd,
		int	insideOut
	)

overridevirtual

Clip this edge using scalar value provided.

Like contouring, except that it cuts the edge to produce linear line segments.

Implements vtkCell.

int vtkQuadraticEdge::IntersectWithLine	(	const double	p1[3],
		const double	p2[3],
		double	tol,
		double &	t,
		double	x[3],
		double	pcoords[3],
		int &	subId
	)

overridevirtual

Line-edge intersection.

Intersection has to occur within [0,1] parametric coordinates and with specified tolerance.

Implements vtkCell.

int vtkQuadraticEdge::GetParametricCenter ( double pcoords[3] )

inlineoverridevirtual

Return the center of the quadratic tetra in parametric coordinates.

Reimplemented from vtkCell.

Definition at line 134 of file vtkQuadraticEdge.h.

static void vtkQuadraticEdge::InterpolationFunctions	(	const double	pcoords[3],
		double	weights[3]
	)

static

Deprecated:: Replaced by vtkQuadraticEdge::InterpolateFunctions as of VTK 5.2

static void vtkQuadraticEdge::InterpolationDerivs	(	const double	pcoords[3],
		double	derivs[3]
	)

static

Deprecated:: Replaced by vtkQuadraticEdge::InterpolateDerivs as of VTK 5.2

void vtkQuadraticEdge::InterpolateFunctions	(	const double	pcoords[3],
		double	weights[3]
	)

inlineoverride

Compute the interpolation functions/derivatives (aka shape functions/derivatives)

Definition at line 112 of file vtkQuadraticEdge.h.

void vtkQuadraticEdge::InterpolateDerivs	(	const double	pcoords[3],
		double	derivs[3]
	)

inlineoverride

Compute the interpolation functions/derivatives (aka shape functions/derivatives)

Definition at line 116 of file vtkQuadraticEdge.h.

Member Data Documentation

vtkLine* vtkQuadraticEdge::Line

protected

Definition at line 126 of file vtkQuadraticEdge.h.

vtkDoubleArray* vtkQuadraticEdge::Scalars

protected

Definition at line 127 of file vtkQuadraticEdge.h.

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

/home/demarle/Source/VTK/release/8.2/build/Utilities/Doxygen/dox/Common/DataModel/vtkQuadraticEdge.h

Public Types

Public Member Functions

Static Public Member Functions

Protected Member Functions

Protected Attributes

Additional Inherited Members

Detailed Description

Member Typedef Documentation

Constructor & Destructor Documentation

Member Function Documentation

Member Data Documentation