Qwt User's Guide: qwt_spline_curve_fitter.cpp Source File

Qwt User's Guide 6.3.0

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qwt_spline_curve_fitter.cpp
1/******************************************************************************
2 * Qwt Widget Library
3 * Copyright (C) 1997 Josef Wilgen
4 * Copyright (C) 2002 Uwe Rathmann
5 *
6 * This library is free software; you can redistribute it and/or
7 * modify it under the terms of the Qwt License, Version 1.0
8 *****************************************************************************/
9
10#include "qwt_spline_curve_fitter.h"
11#include "qwt_spline_local.h"
12#include "qwt_spline_parametrization.h"
13
14#include <qpolygon.h>
15#include <qpainterpath.h>
16
18QwtSplineCurveFitter::QwtSplineCurveFitter()
19 : QwtCurveFitter( QwtCurveFitter::Path )
20{
21 m_spline = new QwtSplineLocal( QwtSplineLocal::Cardinal );
22 m_spline->setParametrization( QwtSplineParametrization::ParameterUniform );
23}
24
26QwtSplineCurveFitter::~QwtSplineCurveFitter()
27{
28 delete m_spline;
29}
30
40 void QwtSplineCurveFitter::setSpline( QwtSpline* spline )
41{
42 if ( m_spline == spline )
43 return;
44
45 delete m_spline;
46 m_spline = spline;
47}
48
53 const QwtSpline* QwtSplineCurveFitter::spline() const
54{
55 return m_spline;
56}
57
62 QwtSpline* QwtSplineCurveFitter::spline()
63{
64 return m_spline;
65}
66
75QPolygonF QwtSplineCurveFitter::fitCurve( const QPolygonF& points ) const
76{
77 const QPainterPath path = fitCurvePath( points );
78
79 const QList< QPolygonF > subPaths = path.toSubpathPolygons();
80 if ( subPaths.size() == 1 )
81 return subPaths.first();
82
83 return QPolygonF();
84}
85
94QPainterPath QwtSplineCurveFitter::fitCurvePath( const QPolygonF& points ) const
95{
96 QPainterPath path;
97
98 if ( m_spline )
99 path = m_spline->painterPath( points );
100
101 return path;
102}
QList
Definition qwt_abstract_legend.h:17
QwtCurveFitter
Abstract base class for a curve fitter.
Definition qwt_curve_fitter.h:22
QwtSplineCurveFitter::setSpline
void setSpline(QwtSpline *)
Definition qwt_spline_curve_fitter.cpp:40
QwtSplineCurveFitter::fitCurvePath
virtual QPainterPath fitCurvePath(const QPolygonF &) const override
Definition qwt_spline_curve_fitter.cpp:94
QwtSplineCurveFitter::~QwtSplineCurveFitter
virtual ~QwtSplineCurveFitter()
Destructor.
Definition qwt_spline_curve_fitter.cpp:26
QwtSplineCurveFitter::QwtSplineCurveFitter
QwtSplineCurveFitter()
Constructor.
Definition qwt_spline_curve_fitter.cpp:18
QwtSplineCurveFitter::spline
const QwtSpline * spline() const
Definition qwt_spline_curve_fitter.cpp:53
QwtSplineCurveFitter::fitCurve
virtual QPolygonF fitCurve(const QPolygonF &) const override
Definition qwt_spline_curve_fitter.cpp:75
QwtSpline
Base class for all splines.
Definition qwt_spline.h:58
QwtSpline::painterPath
virtual QPainterPath painterPath(const QPolygonF &) const =0
QwtSpline::setParametrization
void setParametrization(int type)
Definition qwt_spline.cpp:576
QwtSplineLocal
A spline with C1 continuity.
Definition qwt_spline_local.h:25
QwtSplineLocal::Cardinal
@ Cardinal
Definition qwt_spline_local.h:42
QwtSplineParametrization::ParameterUniform
@ ParameterUniform
Definition qwt_spline_parametrization.h:72