Pure Virtual Function in C++ Post: 302120061

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qwtdata

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

NAME

       QwtData -

       QwtData defines an interface to any type of curve data.

SYNOPSIS

       #include <qwt_data.h>

       Inherited by QwtArrayData, QwtCPointerData, and QwtPolygonFData.

   Public Member Functions
       virtual QwtDoubleRect boundingRect () const
       virtual QwtData * copy () const =0
       QwtData ()
       virtual size_t size () const =0
       virtual double x (size_t i) const =0
       virtual double y (size_t i) const =0
       virtual ~QwtData ()

   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

Constructor &; Destructor Documentation
   QwtData::QwtData ()
       Constructor.

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

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 QwtArrayData, and QwtCPointerData.

   virtual QwtData* QwtData::copy () const [pure virtual] Returns:
	   Pointer to a copy (virtual copy constructor)

       Implemented in QwtPolygonFData, QwtArrayData, and QwtCPointerData.

   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 QwtPolygonFData, QwtArrayData, and QwtCPointerData.

   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 QwtPolygonFData, QwtArrayData, and QwtCPointerData.

   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 QwtPolygonFData, QwtArrayData, and QwtCPointerData.

Author
       Generated automatically by Doxygen for Qwt User's Guide from the source code.

Version 5.2.2							  Mon Aug 1 2011							QwtData(3)