An approximation using a basis spline. More...

Inheritance diagram for QwtSplineBasis:

Public Member Functions
	QwtSplineBasis ()
	Constructor.

	~QwtSplineBasis () override
	Destructor.

virtual QPainterPath	painterPath (const QPolygonF &) const override
	Get painter path from polygon.

virtual uint	locality () const override
	Get locality (always 2)

Public Member Functions inherited from QwtSpline
	QwtSpline ()
	Constructor.

virtual	~QwtSpline ()
	Destructor.

void	setParametrization (int type)
	Set parametrization by type.

void	setParametrization (QwtSplineParametrization *)
	Set parametrization object.

const QwtSplineParametrization *	parametrization () const
	Get parametrization.

void	setBoundaryType (BoundaryType)
	Set boundary type.

BoundaryType	boundaryType () const
	Get boundary type.

void	setBoundaryValue (BoundaryPosition, double value)
	Set boundary value.

double	boundaryValue (BoundaryPosition) const
	Get boundary value.

void	setBoundaryCondition (BoundaryPosition, int condition)
	Set boundary condition.

int	boundaryCondition (BoundaryPosition) const
	Get boundary condition.

void	setBoundaryConditions (int condition, double valueBegin=0.0, double valueEnd=0.0)
	Set boundary conditions for both ends.

virtual QPolygonF	polygon (const QPolygonF &, double tolerance) const
	Get polygon approximation with tolerance.

Additional Inherited Members
Public Types inherited from QwtSpline
enum	BoundaryType { ConditionalBoundaries , PeriodicPolygon , ClosedPolygon }
	Boundary type specifying the spline at its endpoints. More...

enum	BoundaryPosition { AtBeginning , AtEnd }
	position of a boundary condition More...

enum	BoundaryCondition { Clamped1 , Clamped2 , Clamped3 , LinearRunout }
	Boundary condition. More...

Detailed Description

An approximation using a basis spline.

QwtSplineBasis approximates a set of points by a polynomials with C2 continuity ( = first and second derivatives are equal ) at the end points.

The end points of the spline do not match the original points.

Member Function Documentation

uint QwtSplineBasis::locality ( ) const

overridevirtual

Get locality (always 2)

Get locality.

The locality is always 2, meaning changing one control point affects 2 polynomials before and 2 polynomials after.

Reimplemented from QwtSpline.

QPainterPath QwtSplineBasis::painterPath ( const QPolygonF & points ) const

overridevirtual

Get painter path from polygon.

Approximate a polygon with cubic Bezier curves.

Approximates a polygon piecewise with cubic Bezier curves and returns them as QPainterPath.

Parameters

[in] points Control points

Implements QwtSpline.

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