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NAME

       QwtWeedingCurveFitter -

       A curve fitter implementing Douglas and Peucker algorithm.

SYNOPSIS

       #include <qwt_curve_fitter.h>

       Inherits QwtCurveFitter.

   Public Member Functions
       QwtWeedingCurveFitter (double tolerance=1.0)
       virtual ~QwtWeedingCurveFitter ()
       void setTolerance (double)
       double tolerance () const
       virtual QPolygonF fitCurve (const QPolygonF &) const

Detailed Description

       A curve fitter implementing Douglas and Peucker algorithm.

       The purpose of the Douglas and Peucker algorithm is that given a 'curve' composed of line
       segments to find a curve not too dissimilar but that has fewer points. The algorithm
       defines 'too dissimilar' based on the maximum distance (tolerance) between the original
       curve and the smoothed curve.

       The smoothed curve consists of a subset of the points that defined the original curve.

       In opposite to QwtSplineCurveFitter the Douglas and Peucker algorithm reduces the number
       of points. By adjusting the tolerance parameter according to the axis scales
       QwtSplineCurveFitter can be used to implement different level of details to speed up
       painting of curves of many points.

Constructor & Destructor Documentation

   QwtWeedingCurveFitter::QwtWeedingCurveFitter (doubletolerance = 1.0) Constructor
       Parameters:
           tolerance Tolerance

       See also:
           setTolerance(), tolerance()

   QwtWeedingCurveFitter::~QwtWeedingCurveFitter () [virtual]
       Destructor.

Member Function Documentation

   QPolygonF QwtWeedingCurveFitter::fitCurve (const QPolygonF &points) const [virtual]
       Parameters:
           points Series of data points

       Returns:
           Curve points

       Implements QwtCurveFitter.

   void QwtWeedingCurveFitter::setTolerance (doubletolerance) Assign the tolerance
       The tolerance is the maximum distance, that is accaptable between the original curve and
       the smoothed curve.

       Increasing the tolerance will reduce the number of the resulting points.

       Parameters:
           tolerance Tolerance

       See also:
           tolerance()

   double QwtWeedingCurveFitter::tolerance () const Returns:
           Tolerance

       See also:
           setTolerance()

Author

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