QwtSplineCurveFitter Class Reference

A curve fitter using cubic splines. More...

#include <qwt_curve_fitter.h>

Inheritance diagram for QwtSplineCurveFitter:

Collaboration diagram for QwtSplineCurveFitter:

List of all members.

Classes
class	PrivateData
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 QMemArray< QwtDoublePoint >	fitCurve (const QMemArray< QwtDoublePoint > &) const

---

Detailed Description

A curve fitter using cubic splines.

Definition at line 71 of file qwt_curve_fitter.h.

---

Member Enumeration Documentation

enum QwtSplineCurveFitter::FitMode

Enumerator:

Auto
Spline
ParametricSpline

Definition at line 74 of file qwt_curve_fitter.h.

    {
        Auto,
        Spline,
        ParametricSpline
    };

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Constructor & Destructor Documentation

QwtSplineCurveFitter::QwtSplineCurveFitter

(

)

Constructor.

Definition at line 39 of file qwt_curve_fitter.cpp.

{
    d_data = new PrivateData;
}

QwtSplineCurveFitter::~QwtSplineCurveFitter

(

)

[virtual]

Destructor.

Definition at line 45 of file qwt_curve_fitter.cpp.

{
    delete d_data;
}

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Member Function Documentation

QMemArray< QwtDoublePoint > QwtSplineCurveFitter::fitCurve

(

const QMemArray< QwtDoublePoint > &

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.

Definition at line 103 of file qwt_curve_fitter.cpp.

References int().

{
    const int size = (int)points.size();
    if ( size <= 2 )
        return points;

    FitMode fitMode = d_data->fitMode;
    if ( fitMode == Auto )
    {
        fitMode = Spline;

        const QwtDoublePoint *p = points.data();
        for ( int i = 1; i < size; i++ )
        {
            if ( p[i].x() <= p[i-1].x() )
            {
                fitMode = ParametricSpline;
                break;
            }
        };
    }

    if ( fitMode == ParametricSpline )
        return fitParametric(points);
    else
        return fitSpline(points);
}

QwtSplineCurveFitter::FitMode QwtSplineCurveFitter::fitMode

(

)

const

Returns:

Mode representing a spline algorithm

See also:

setFitMode()

Definition at line 65 of file qwt_curve_fitter.cpp.

References QwtSplineCurveFitter::PrivateData::fitMode.

{
    return d_data->fitMode;
}

void QwtSplineCurveFitter::setFitMode

(

FitMode

mode )

Select the algorithm used for building the spline

Parameters:

mode	Mode representing a spline algorithm

See also:

fitMode()

Definition at line 56 of file qwt_curve_fitter.cpp.

References QwtSplineCurveFitter::PrivateData::fitMode.

{
    d_data->fitMode = mode;
}

void QwtSplineCurveFitter::setSpline

(

const QwtSpline &

spline )

Definition at line 70 of file qwt_curve_fitter.cpp.

References QwtSpline::reset(), spline(), and QwtSplineCurveFitter::PrivateData::spline.

{
    d_data->spline = spline;
    d_data->spline.reset();
}

void QwtSplineCurveFitter::setSplineSize

(

int

size )

Definition at line 86 of file qwt_curve_fitter.cpp.

References qwtMax, and QwtSplineCurveFitter::PrivateData::splineSize.

{
    d_data->splineSize = qwtMax(splineSize, 10);
}

const QwtSpline & QwtSplineCurveFitter::spline

(

)

const

Definition at line 76 of file qwt_curve_fitter.cpp.

References QwtSplineCurveFitter::PrivateData::spline.

Referenced by setSpline().

{
    return d_data->spline;
}

QwtSpline & QwtSplineCurveFitter::spline

(

)

Definition at line 81 of file qwt_curve_fitter.cpp.

References QwtSplineCurveFitter::PrivateData::spline.

{
    return d_data->spline;
}

int QwtSplineCurveFitter::splineSize

(

)

const

Definition at line 91 of file qwt_curve_fitter.cpp.

References QwtSplineCurveFitter::PrivateData::splineSize.

{
    return d_data->splineSize;
}

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

• qwt_curve_fitter.h
• qwt_curve_fitter.cpp