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33fc476d89
* require qwt >=6.2 (and fallback to internal 6.3 if system's qwt doesn't suffice) * debian doesn't have qwt for Qt6 and won't have it for trixie
103 lines
2.2 KiB
C++
103 lines
2.2 KiB
C++
/******************************************************************************
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* Qwt Widget Library
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* Copyright (C) 1997 Josef Wilgen
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* Copyright (C) 2002 Uwe Rathmann
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the Qwt License, Version 1.0
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*****************************************************************************/
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#include "qwt_spline_curve_fitter.h"
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#include "qwt_spline_local.h"
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#include "qwt_spline_parametrization.h"
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#include <qpolygon.h>
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#include <qpainterpath.h>
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//! Constructor
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QwtSplineCurveFitter::QwtSplineCurveFitter()
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: QwtCurveFitter( QwtCurveFitter::Path )
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{
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m_spline = new QwtSplineLocal( QwtSplineLocal::Cardinal );
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m_spline->setParametrization( QwtSplineParametrization::ParameterUniform );
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}
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//! Destructor
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QwtSplineCurveFitter::~QwtSplineCurveFitter()
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{
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delete m_spline;
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}
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/*!
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Assign a spline
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The spline needs to be allocated by new and will be deleted
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in the destructor of the fitter.
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\param spline Spline
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\sa spline()
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*/
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void QwtSplineCurveFitter::setSpline( QwtSpline* spline )
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{
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if ( m_spline == spline )
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return;
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delete m_spline;
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m_spline = spline;
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}
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/*!
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\return Spline
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\sa setSpline()
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*/
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const QwtSpline* QwtSplineCurveFitter::spline() const
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{
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return m_spline;
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}
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/*!
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\return Spline
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\sa setSpline()
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*/
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QwtSpline* QwtSplineCurveFitter::spline()
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{
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return m_spline;
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}
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/*!
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Find a curve which has the best fit to a series of data points
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\param points Series of data points
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\return Fitted Curve
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\sa fitCurvePath()
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*/
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QPolygonF QwtSplineCurveFitter::fitCurve( const QPolygonF& points ) const
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{
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const QPainterPath path = fitCurvePath( points );
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const QList< QPolygonF > subPaths = path.toSubpathPolygons();
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if ( subPaths.size() == 1 )
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return subPaths.first();
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return QPolygonF();
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}
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/*!
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Find a curve path which has the best fit to a series of data points
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\param points Series of data points
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\return Fitted Curve
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\sa fitCurve()
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*/
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QPainterPath QwtSplineCurveFitter::fitCurvePath( const QPolygonF& points ) const
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{
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QPainterPath path;
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if ( m_spline )
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path = m_spline->painterPath( points );
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return path;
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}
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