#include <qwt_spline_approximation.h>

Classes
class	PrivateData

Public Types
enum	BoundaryType { ConditionalBoundaries, PeriodicPolygon, ClosedPolygon }

Public Member Functions
BoundaryType	boundaryType () const

virtual uint	locality () const

virtual QPainterPath	painterPath (const QPolygonF &) const =0

const QwtSplineParametrization *	parametrization () const

	QwtSplineApproximation ()
	Constructor. More...

void	setBoundaryType (BoundaryType)

void	setParametrization (int type)

void	setParametrization (QwtSplineParametrization *)

virtual	~QwtSplineApproximation ()
	Destructor. More...

Private Attributes
PrivateData *	d_data

Detailed Description

Definition at line 18 of file qwt_spline_approximation.h.

Member Enumeration Documentation

enum QwtSplineApproximation::BoundaryType

Enumerator

ConditionalBoundaries

PeriodicPolygon

ClosedPolygon

ClosedPolygon is similar to PeriodicPolygon beside, that the interpolation includes the connection between the last and the first control point.

Note: Only works for parametrizations, where the parameter increment for the the final closing line is positive. This excludes QwtSplineParametrization::ParameterX and QwtSplineParametrization::ParameterY

Definition at line 21 of file qwt_spline_approximation.h.

Constructor & Destructor Documentation

QwtSplineApproximation::QwtSplineApproximation ( )

Constructor.

The default setting is a non closing spline with chordal parametrization

See also: setParametrization(), setClosing()

Definition at line 39 of file qwt_spline_approximation.cpp.

QwtSplineApproximation::~QwtSplineApproximation ( )

virtual

Destructor.

Definition at line 45 of file qwt_spline_approximation.cpp.

Member Function Documentation

QwtSplineApproximation::BoundaryType QwtSplineApproximation::boundaryType ( ) const

Definition at line 96 of file qwt_spline_approximation.cpp.

uint QwtSplineApproximation::locality ( ) const

virtual

The locality of an spline interpolation identifies how many adjacent polynoms are affected, when changing the position of one point.

A locality of 'n' means, that changing the coordinates of a point has an effect on 'n' leading and 'n' following polynoms. Those polynoms can be calculated from a local subpolygon.

A value of 0 means, that the interpolation is not local and any modification of the polygon requires to recalculate all polynoms ( f.e cubic splines ).