QwtSplineC1 Class Reference

Base class for spline interpolations with C1 (first order parametric) continuity. More...

#include <qwt_spline.h>

Inheritance diagram for QwtSplineC1:

Public Member Functions
	QwtSplineC1 ()
	Constructor.
virtual	~QwtSplineC1 ()
	Destructor .
virtual QPainterPath	painterPath (const QPolygonF &) const override
	Calculate an interpolated painter path.
virtual QVector< QLineF >	bezierControlLines (const QPolygonF &) const override
	Interpolate a curve with Bezier curves.
virtual QPolygonF	equidistantPolygon (const QPolygonF &, double distance, bool withNodes) const override
	Find an interpolated polygon with "equidistant" points.
virtual QVector< QwtSplinePolynomial >	polynomials (const QPolygonF &) const
	Calculate the interpolating polynomials for a non-parametric spline.
virtual QVector< double >	slopes (const QPolygonF &) const =0
	Find the first derivative at the control points.
virtual double	slopeAtBeginning (const QPolygonF &, double slopeNext) const
	Calculate the slope at the beginning of the spline.
virtual double	slopeAtEnd (const QPolygonF &, double slopeBefore) const
	Calculate the slope at the end of the spline.
Public Member Functions inherited from QwtSplineG1
	QwtSplineG1 ()
	Constructor .
virtual	~QwtSplineG1 ()
	Destructor .
Public Member Functions inherited from QwtSplineInterpolating
	QwtSplineInterpolating ()
	Constructor .
virtual	~QwtSplineInterpolating ()
	Destructor .
virtual QPolygonF	polygon (const QPolygonF &, double tolerance) const override
	Interpolate a curve by a polygon.
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 uint	locality () const
	Get locality (number of points used for calculation)

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

Base class for spline interpolations with C1 (first order parametric) continuity.

Constructor & Destructor Documentation

QwtSplineC1()

QwtSplineC1::QwtSplineC1

(

)

Constructor.

~QwtSplineC1()

QwtSplineC1::~QwtSplineC1 ( )

virtual

Destructor .

Member Function Documentation

bezierControlLines()

QVector< QLineF > QwtSplineC1::bezierControlLines ( const QPolygonF &  points ) const

overridevirtual

Interpolate a curve with Bezier curves.

Implements QwtSplineInterpolating.

Reimplemented in QwtSplineC2, QwtSplineLocal, and QwtSplineCubic.

equidistantPolygon()

QPolygonF QwtSplineC1::equidistantPolygon ( const QPolygonF &  points, double  distance, bool  withNodes  ) const

overridevirtual

Find an interpolated polygon with "equidistant" points.

Reimplemented from QwtSplineInterpolating.

Reimplemented in QwtSplineC2.

painterPath()

QPainterPath QwtSplineC1::painterPath ( const QPolygonF &  points ) const

overridevirtual

Calculate an interpolated painter path.

Reimplemented from QwtSplineInterpolating.

Reimplemented in QwtSplineC2, QwtSplineCubic, and QwtSplineLocal.

polynomials()

QVector< QwtSplinePolynomial > QwtSplineC1::polynomials ( const QPolygonF &  points ) const

virtual

Calculate the interpolating polynomials for a non-parametric spline.

Reimplemented in QwtSplineC2, QwtSplineCubic, and QwtSplineLocal.

slopeAtBeginning()

double QwtSplineC1::slopeAtBeginning ( const QPolygonF &  points, double  slopeNext  ) const

virtual

Calculate the slope at the beginning of the spline.

slopeAtEnd()

double QwtSplineC1::slopeAtEnd ( const QPolygonF &  points, double  slopeBefore  ) const

virtual

Calculate the slope at the end of the spline.

slopes()

QVector< double > QwtSplineC1::slopes ( const QPolygonF &  points ) const

pure virtual

Find the first derivative at the control points.

Parameters

points

Control nodes of the spline

Returns

Vector with the values of the 2nd derivate at the control points

Note

The x coordinates need to be increasing or decreasing

Implemented in QwtSplineC2, QwtSplineCubic, and QwtSplineLocal.

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

• /home/runner/work/QWT/QWT/src/plot/qwt_spline.h
• /home/runner/work/QWT/QWT/src/plot/qwt_spline.cpp