QwtWeedingCurveFitter(3)					 Qwt User's Guide					  QwtWeedingCurveFitter(3)

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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Version 6.0.0							  Fri Apr 15 2011					  QwtWeedingCurveFitter(3)