QwtPolygonFData - Man Page

Name

QwtPolygonFData —

Data class containing a single QwtArray<QwtDoublePoint> object.

Synopsis

#include <qwt_data.h>

Inherits QwtData.

virtual QwtDoubleRect boundingRect () const
virtual QwtData * copy () const
const QPolygonF & data () const
QwtPolygonFData & operator= (const QwtPolygonFData &)
QwtPolygonFData (const QPolygonF &)
virtual size_t size () const
virtual double x (size_t i) const
virtual double y (size_t i) const

Detailed Description

Data class containing a single QwtArray<QwtDoublePoint> object.

Constructor & Destructor Documentation

QwtPolygonFData::QwtPolygonFData (const QPolygonF &polygon) Constructor

Parameters:: polygon Polygon data
See also:: QwtPlotCurve::setData()

Member Function Documentation

QwtDoubleRect QwtData::boundingRect () const [virtual, inherited] Returns the bounding rectangle of the data. If there is no bounding rect, like for empty data the rectangle is invalid: QwtDoubleRect::isValid() == false

Warning:: This is an slow implementation iterating over all points. It is intended to be overloaded by derived classes. In case of auto scaling boundingRect() is called for every replot, so it might be worth to implement a cache, or use x(0), x(size() - 1) for ordered data ...

Reimplemented in QwtArrayData, and QwtCPointerData.