QwtSplinePleasing Class Reference

A spline with G1 continuity. More...

#include <qwt_spline_pleasing.h>

Inheritance diagram for QwtSplinePleasing:

Public Member Functions
	QwtSplinePleasing ()
	Constructor.
	~QwtSplinePleasing () override
	Destructor.
virtual uint	locality () const override
	Get locality.
virtual QPainterPath	painterPath (const QPolygonF &) const override
	Interpolate a curve with Bezier curves.
virtual QVector< QLineF >	bezierControlLines (const QPolygonF &) const override
	Interpolate a curve with Bezier curves.
Public Member Functions inherited from QwtSplineG1
	QwtSplineG1 ()
	Constructor.
	~QwtSplineG1 () override
	Destructor.
Public Member Functions inherited from QwtSplineInterpolating
	QwtSplineInterpolating ()
	Constructor.
	~QwtSplineInterpolating () override
	Destructor.
virtual QPolygonF	equidistantPolygon (const QPolygonF &, double distance, bool withNodes) const
	Find an interpolated polygon with "equidistant" points.
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.

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

A spline with G1 continuity.

QwtSplinePleasing is some sort of cardinal spline, with non C1 continuous extra rules for narrow angles. It has a locality of 2.

Note

The algorithm is the one offered by a popular office package.

Constructor & Destructor Documentation

QwtSplinePleasing()

QwtSplinePleasing::QwtSplinePleasing

(

)

Constructor.

The default setting is a non closing spline with uniform parametrization. ( QwtSplineParametrization::ParameterUniform ).

See also

QwtSpline::setParametrization(), QwtSpline::setBoundaryType()

Member Function Documentation

bezierControlLines()

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

overridevirtual

Interpolate a curve with Bezier curves.

Interpolates a polygon piecewise with cubic Bezier curves and returns the 2 control points of each curve as QLineF.

Parameters

points

Control points

Returns

Control points of the interpolating Bezier curves

Implements QwtSplineInterpolating.

locality()

uint QwtSplinePleasing::locality ( ) const

overridevirtual

Get locality.

Returns

2 (looks 2 points ahead/behind)

Reimplemented from QwtSpline.

painterPath()

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

overridevirtual

Interpolate a curve with Bezier curves.

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

Parameters

points

Control points

Returns

QPainterPath Painter path, that can be rendered by QPainter

Reimplemented from QwtSplineInterpolating.

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

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