QwtSplineParametrization Class Reference

Curve parametrization used for a spline interpolation. More...

#include <qwt_spline_parametrization.h>

Public Types
enum	Type {   ParameterX , ParameterY , ParameterUniform , ParameterChordal ,   ParameterCentripetal , ParameterManhattan }
	Parametrization type. More...

Public Member Functions
	QwtSplineParametrization (int type)
	Constructor.
virtual	~QwtSplineParametrization ()
	Destructor .
int	type () const
	Get the parametrization type.
virtual double	valueIncrement (const QPointF &, const QPointF &) const
	Calculate the parameter value increment for 2 points.

Static Public Member Functions
static double	valueIncrementX (const QPointF &, const QPointF &)
	Calculate the ParameterX value increment for 2 points.
static double	valueIncrementY (const QPointF &, const QPointF &)
	Calculate the ParameterY value increment for 2 points.
static double	valueIncrementUniform (const QPointF &, const QPointF &)
	Calculate the ParameterUniform value increment.
static double	valueIncrementChordal (const QPointF &, const QPointF &)
	Calculate the ParameterChordal value increment for 2 points.
static double	valueIncrementCentripetal (const QPointF &, const QPointF &)
	Calculate the ParameterCentripetal value increment for 2 points.
static double	valueIncrementManhattan (const QPointF &, const QPointF &)
	Calculate the ParameterManhattan value increment for 2 points.

Detailed Description

Curve parametrization used for a spline interpolation.

Member Enumeration Documentation

Type

enum QwtSplineParametrization::Type

Parametrization type.

Enumerator
ParameterX	No parametrization: t[i] = x[i]. See also valueIncrementX()
ParameterY	No parametrization: t[i] = y[i]. See also valueIncrementY()
ParameterUniform	Uniform parametrization: t[i] = i;. A very fast parametrization, with good results, when the geometry of the control points is somehow "equidistant". F.e. when recording the position of a body, that is moving with constant speed every n seconds. See also valueIncrementUniform()
ParameterChordal	Parametrization using the chordal length between two control points. The chordal length is the most commonly used approximation for the curve length. See also valueIncrementChordal()
ParameterCentripetal	Centripetal parametrization. Based on the square root of the chordal length. Its name stems from the physical observations regarding the centripetal force, of a body moving along the curve. See also valueIncrementCentripetal()
ParameterManhattan	Parametrization using the manhattan length between two control points. Approximating the curve length by the manhattan length is faster than the chordal length, but usually gives worse results. See also valueIncrementManhattan()

Constructor & Destructor Documentation

QwtSplineParametrization()

QwtSplineParametrization::QwtSplineParametrization ( int  type )

explicit

Constructor.

~QwtSplineParametrization()

QwtSplineParametrization::~QwtSplineParametrization ( )

virtual

Destructor .

Member Function Documentation

type()

int QwtSplineParametrization::type

(

)

const

Get the parametrization type.

valueIncrement()

double QwtSplineParametrization::valueIncrement ( const QPointF &  point1, const QPointF &  point2  ) const

virtual

Calculate the parameter value increment for 2 points.

valueIncrementCentripetal()

double QwtSplineParametrization::valueIncrementCentripetal ( const QPointF &  point1, const QPointF &  point2  )

inlinestatic

Calculate the ParameterCentripetal value increment for 2 points.

valueIncrementChordal()

double QwtSplineParametrization::valueIncrementChordal ( const QPointF &  point1, const QPointF &  point2  )

inlinestatic

Calculate the ParameterChordal value increment for 2 points.

valueIncrementManhattan()

double QwtSplineParametrization::valueIncrementManhattan ( const QPointF &  point1, const QPointF &  point2  )

inlinestatic

Calculate the ParameterManhattan value increment for 2 points.

valueIncrementUniform()

double QwtSplineParametrization::valueIncrementUniform ( const QPointF &  point1, const QPointF &  point2  )

inlinestatic

Calculate the ParameterUniform value increment.

valueIncrementX()

double QwtSplineParametrization::valueIncrementX ( const QPointF &  point1, const QPointF &  point2  )

inlinestatic

Calculate the ParameterX value increment for 2 points.

valueIncrementY()

double QwtSplineParametrization::valueIncrementY ( const QPointF &  point1, const QPointF &  point2  )

inlinestatic

Calculate the ParameterY value increment for 2 points.

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

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