Qwt User's Guide  6.1.3
QwtSplineCurveFitter Class Reference

A curve fitter using cubic splines. More...

#include <qwt_curve_fitter.h>

Inheritance diagram for QwtSplineCurveFitter:

Public Types

enum  FitMode { Auto, Spline, ParametricSpline }
 

Public Member Functions

 QwtSplineCurveFitter ()
 Constructor.
 
virtual ~QwtSplineCurveFitter ()
 Destructor.
 
void setFitMode (FitMode)
 
FitMode fitMode () const
 
void setSpline (const QwtSpline &)
 
const QwtSplinespline () const
 
QwtSplinespline ()
 
void setSplineSize (int size)
 
int splineSize () const
 
virtual QPolygonF fitCurve (const QPolygonF &) const
 
- Public Member Functions inherited from QwtCurveFitter
virtual ~QwtCurveFitter ()
 Destructor.
 

Additional Inherited Members

- Protected Member Functions inherited from QwtCurveFitter
 QwtCurveFitter ()
 Constructor.
 

Detailed Description

A curve fitter using cubic splines.

Member Enumeration Documentation

Spline type The default setting is Auto

See also
setFitMode(), FitMode()
Enumerator
Auto 

Use the default spline algorithm for polygons with increasing x values ( p[i-1] < p[i] ), otherwise use a parametric spline algorithm.

Spline 

Use a default spline algorithm.

ParametricSpline 

Use a parametric spline algorithm.

Member Function Documentation

QPolygonF QwtSplineCurveFitter::fitCurve ( const QPolygonF &  points) const
virtual

Find a curve which has the best fit to a series of data points

Parameters
pointsSeries of data points
Returns
Curve points

Implements QwtCurveFitter.

QwtSplineCurveFitter::FitMode QwtSplineCurveFitter::fitMode ( ) const
Returns
Mode representing a spline algorithm
See also
setFitMode()
void QwtSplineCurveFitter::setFitMode ( FitMode  mode)

Select the algorithm used for building the spline

Parameters
modeMode representing a spline algorithm
See also
fitMode()
void QwtSplineCurveFitter::setSpline ( const QwtSpline spline)

Assign a spline

Parameters
splineSpline
See also
spline()
void QwtSplineCurveFitter::setSplineSize ( int  splineSize)

Assign a spline size ( has to be at least 10 points )

Parameters
splineSizeSpline size
See also
splineSize()
const QwtSpline & QwtSplineCurveFitter::spline ( ) const
Returns
Spline
See also
setSpline()
QwtSpline & QwtSplineCurveFitter::spline ( )
Returns
Spline
See also
setSpline()
int QwtSplineCurveFitter::splineSize ( ) const
Returns
Spline size
See also
setSplineSize()