Qwt User's Guide: QwtSplineCurveFitter Class Reference

Qwt User's Guide 6.1.3

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QwtSplineCurveFitter Class Reference

A curve fitter using cubic splines. More...

`#include <qwt_curve_fitter.h>`

Inheritance diagram for QwtSplineCurveFitter:
[legend]

## 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 QwtSpline & | spline () const
QwtSpline & | spline ()
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

enum QwtSplineCurveFitter::FitMode

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

  points | Series 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

  mode | Mode representing a spline algorithm

See also
  fitMode()

void QwtSplineCurveFitter::setSpline | ( | const QwtSpline & | spline | ) |

Assign a spline

Parameters

  spline | Spline

See also
  spline()

void QwtSplineCurveFitter::setSplineSize | ( | int | splineSize | ) |

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

Parameters

  splineSize | Spline 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()