QwtSplinePleasing Class Reference

A spline with G1 continuity. More...

#include <qwt_spline_pleasing.h>

Inheritance diagram for QwtSplinePleasing:

Public Member Functions
	QwtSplinePleasing ()
	Constructor.
virtual	~QwtSplinePleasing ()
	Destructor.
virtual uint	locality () const override
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.
virtual	~QwtSplineG1 ()
	Destructor.
Public Member Functions inherited from QwtSplineInterpolating
	QwtSplineInterpolating ()
	Constructor.
virtual	~QwtSplineInterpolating ()
	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)
void	setParametrization (QwtSplineParametrization *)
const QwtSplineParametrization *	parametrization () const
void	setBoundaryType (BoundaryType)
BoundaryType	boundaryType () const
void	setBoundaryValue (BoundaryPosition, double value)
	Define the boundary value.
double	boundaryValue (BoundaryPosition) const
void	setBoundaryCondition (BoundaryPosition, int condition)
	Define the condition for an endpoint of the spline.
int	boundaryCondition (BoundaryPosition) const
void	setBoundaryConditions (int condition, double valueBegin=0.0, double valueEnd=0.0)
	Define the condition at the endpoints of a spline.

Additional Inherited Members
Public Types inherited from QwtSpline
enum	BoundaryType { ConditionalBoundaries , PeriodicPolygon , ClosedPolygon }
enum	BoundaryPosition { AtBeginning , AtEnd }
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.

Definition at line 23 of file qwt_spline_pleasing.h.

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()

Definition at line 265 of file qwt_spline_pleasing.cpp.

~QwtSplinePleasing()

QwtSplinePleasing::~QwtSplinePleasing ( )

virtual

Destructor.

Definition at line 271 of file qwt_spline_pleasing.cpp.

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.

Definition at line 327 of file qwt_spline_pleasing.cpp.

locality()

uint QwtSplinePleasing::locality ( ) const

overridevirtual

Returns

2

Reimplemented from QwtSpline.

Definition at line 276 of file qwt_spline_pleasing.cpp.

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.

Definition at line 290 of file qwt_spline_pleasing.cpp.