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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:

       · store the data in almost any type of container

       · 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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