/usr/include/qwt-qt4/qwt_spline.h is in libqwt5-qt4-dev 5.2.2-1ubuntu2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 | /* -*- mode: C++ ; c-file-style: "stroustrup" -*- *****************************
* Qwt Widget Library
* Copyright (C) 1997 Josef Wilgen
* Copyright (C) 2002 Uwe Rathmann
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the Qwt License, Version 1.0
*****************************************************************************/
#ifndef QWT_SPLINE_H
#define QWT_SPLINE_H
#include "qwt_global.h"
#include "qwt_double_rect.h"
#if QT_VERSION >= 0x040000
#include <QPolygonF>
#else
#include "qwt_array.h"
#endif
// MOC_SKIP_BEGIN
#if defined(QWT_TEMPLATEDLL)
#if QT_VERSION < 0x040000
#ifndef QWTARRAY_TEMPLATE_QWTDOUBLEPOINT // by mjo3
#define QWTARRAY_TEMPLATE_QWTDOUBLEPOINT
template class QWT_EXPORT QwtArray<QwtDoublePoint>;
#endif //end of QWTARRAY_TEMPLATE_QWTDOUBLEPOINT
#endif
#endif
// MOC_SKIP_END
/*!
\brief A class for spline interpolation
The QwtSpline class is used for cubical spline interpolation.
Two types of splines, natural and periodic, are supported.
\par Usage:
<ol>
<li>First call setPoints() to determine the spline coefficients
for a tabulated function y(x).
<li>After the coefficients have been set up, the interpolated
function value for an argument x can be determined by calling
QwtSpline::value().
</ol>
\par Example:
\code
#include <qwt_spline.h>
QPolygonF interpolate(const QPolygonF& points, int numValues)
{
QwtSpline spline;
if ( !spline.setPoints(points) )
return points;
QPolygonF interpolatedPoints(numValues);
const double delta =
(points[numPoints - 1].x() - points[0].x()) / (points.size() - 1);
for(i = 0; i < points.size(); i++) / interpolate
{
const double x = points[0].x() + i * delta;
interpolatedPoints[i].setX(x);
interpolatedPoints[i].setY(spline.value(x));
}
return interpolatedPoints;
}
\endcode
*/
class QWT_EXPORT QwtSpline
{
public:
//! Spline type
enum SplineType
{
Natural,
Periodic
};
QwtSpline();
QwtSpline( const QwtSpline & );
~QwtSpline();
QwtSpline &operator=( const QwtSpline & );
void setSplineType(SplineType);
SplineType splineType() const;
#if QT_VERSION < 0x040000
bool setPoints(const QwtArray<QwtDoublePoint>& points);
QwtArray<QwtDoublePoint> points() const;
#else
bool setPoints(const QPolygonF& points);
QPolygonF points() const;
#endif
void reset();
bool isValid() const;
double value(double x) const;
const QwtArray<double> &coefficientsA() const;
const QwtArray<double> &coefficientsB() const;
const QwtArray<double> &coefficientsC() const;
protected:
#if QT_VERSION < 0x040000
bool buildNaturalSpline(
const QwtArray<QwtDoublePoint> &);
bool buildPeriodicSpline(
const QwtArray<QwtDoublePoint> &);
#else
bool buildNaturalSpline(const QPolygonF &);
bool buildPeriodicSpline(const QPolygonF &);
#endif
class PrivateData;
PrivateData *d_data;
};
#endif
|