Provided by: libqwt-doc_6.0.0-1ubuntu1_all
QwtWeedingCurveFitter - A curve fitter implementing Douglas and Peucker algorithm.
#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
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()
Generated automatically by Doxygen for Qwt User's Guide from the source code.