Qwt User's Guide: QwtCurveFitter Class Reference

Qwt User's Guide 6.2.0

Public Types | Public Member Functions | Protected Member Functions | List of all members
QwtCurveFitter Class Referenceabstract

Abstract base class for a curve fitter. More...

`#include <qwt_curve_fitter.h>`

Inheritance diagram for QwtCurveFitter:

## Public Types
enum | Mode { Polygon , Path }
| Preferred mode of the fitting algorithm. More...

## Public Member Functions
virtual | ~QwtCurveFitter ()
| Destructor.
Mode | mode () const
virtual QPolygonF | fitCurve (const QPolygonF &polygon) const =0
virtual QPainterPath | fitCurvePath (const QPolygonF &polygon) const =0

## Protected Member Functions
| QwtCurveFitter (Mode mode)

## Detailed Description

Abstract base class for a curve fitter.

Definition at line 21 of file qwt_curve_fitter.h.

## Member Enumeration Documentation

## ◆ Mode

enum QwtCurveFitter::Mode

Preferred mode of the fitting algorithm.

Even if a QPainterPath can always be created from a QPolygonF the overhead of the conversion can be avoided by indicating the preference of the implementation to the application code.

Enumerator
Polygon | The fitting algorithm creates a polygon - the implementation of fitCurvePath() simply wraps the polygon into a path. See also QwtWeedingCurveFitter
Path | The fitting algorithm creates a painter path - the implementation of fitCurve() extracts a polygon from the path. See also QwtSplineCurveFitter

Definition at line 32 of file qwt_curve_fitter.h.

## Constructor & Destructor Documentation

## ◆ QwtCurveFitter()

QwtCurveFitter::QwtCurveFitter | ( | Mode | mode | ) |
| explicitprotected

Constructor

Parameters

  mode | Preferred fitting mode

Definition at line 16 of file qwt_curve_fitter.cpp.

## Member Function Documentation

## ◆ fitCurve()

virtual QPolygonF QwtCurveFitter::fitCurve | ( | const QPolygonF & | polygon | ) | const
| pure virtual

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

Parameters

  polygon | Series of data points

Returns
  Curve points

See also
  fitCurvePath()

Implemented in QwtWeedingCurveFitter, QwtSplineCurveFitter, and QwtPolarFitter.

## ◆ fitCurvePath()

virtual QPainterPath QwtCurveFitter::fitCurvePath | ( | const QPolygonF & | polygon | ) | const
| pure virtual

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

Parameters

  polygon | Series of data points

Returns
  Curve path

See also
  fitCurve()

Implemented in QwtWeedingCurveFitter, QwtSplineCurveFitter, and QwtPolarFitter.

## ◆ mode()

QwtCurveFitter::Mode QwtCurveFitter::mode | ( |  | ) | const

Returns
  Preferred fitting mode

Definition at line 27 of file qwt_curve_fitter.cpp.