#pragma once

#include <qpolygon.h>

#include <qvector.h>

/*!

\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 QwtSpline

};