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

NAME

QwtData -

SYNOPSIS

#include <qwt_data.h> Inherited by QwtArrayData, QwtCPointerData, and QwtPolygonFData. Public Member Functions QwtData () virtual ~QwtData () virtual QwtDoubleRect boundingRect () const virtual QwtData * copy () const =0 virtual size_t size () const =0 virtual double x (size_t i) const =0 virtual double y (size_t i) const =0 Protected Member Functions QwtData & operator= (const QwtData &) Detailed Description QwtData defines an interface to any type of curve data. Classes, derived from QwtData may: o store the data in almost any type of container o calculate the data on the fly instead of storing it Member Function Documentation QwtDoubleRect QwtData::boundingRect () const [virtual] 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 QwtCPointerData, and QwtArrayData. virtual QwtData* QwtData::copy () const [pure virtual] Returns: Pointer to a copy (virtual copy constructor) Implemented in QwtCPointerData, QwtArrayData, and QwtPolygonFData. QwtData& QwtData::operator= (const QwtData &) [protected] Assignment operator (virtualized) virtual size_t QwtData::size () const [pure virtual] Returns: Size of the data set Implemented in QwtCPointerData, QwtArrayData, and QwtPolygonFData. virtual double QwtData::x (size_ti) const [pure virtual] Return the x value of data point i Parameters: i Index Returns: x X value of data point i Implemented in QwtCPointerData, QwtArrayData, and QwtPolygonFData. virtual double QwtData::y (size_ti) const [pure virtual] Return the y value of data point i Parameters: i Index Returns: y Y value of data point i Implemented in QwtCPointerData, QwtArrayData, and QwtPolygonFData. Author Generated automatically by Doxygen for Qwt User's Guide from the source code. Version 5.2.3 Tue Nov 20 2012 QwtData(3)

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