NAME

       QwtSeriesData -

       Abstract interface for iterating over samples.

SYNOPSIS

       #include <qwt_series_data.h>

       Inherited by QwtArraySeriesData< T >.

   Public Member Functions
       QwtSeriesData ()
       virtual ~QwtSeriesData ()
       virtual size_t size () const =0
       virtual T sample (size_t i) const =0
       virtual QRectF boundingRect () const =0
       virtual void setRectOfInterest (const QRectF &)

   Protected Attributes
       QRectF d_boundingRect

Detailed Description

   template<typename T> class QwtSeriesData< T >
       Abstract interface for iterating over samples.

       Qwt offers several implementations of the QwtSeriesData API, but in situations, where data of an
       application specific format needs to be displayed, without having to copy it, it is recommended to
       implement an individual data access.

Constructor & Destructor Documentation

   template<typename T > QwtSeriesData< T >::QwtSeriesData ()
       Constructor.

   template<typename T > QwtSeriesData< T >::~QwtSeriesData () [virtual]
       Destructor.

Member Function Documentation

   template<typename T> virtual QRectF QwtSeriesData< T >::boundingRect () const [pure virtual] Calculate the
       bounding rect of all samples
       The bounding rect is necessary for autoscaling and can be used for a couple of painting optimizations.

       qwtBoundingRect(...) offers slow implementations iterating over the samples. For large sets it is
       recommended to implement something faster f.e. by caching the bounding rect.

       Implemented in QwtPointSeriesData, QwtPoint3DSeriesData, QwtIntervalSeriesData, QwtSetSeriesData,
       QwtPointArrayData, QwtCPointerData, and QwtSyntheticPointData.

   template<typename T> virtual T QwtSeriesData< T >::sample (size_ti) const [pure virtual] Return a sample
       Parameters:
           i Index

       Returns:
           Sample at position i

       Implemented in QwtArraySeriesData< T >, QwtPointArrayData, QwtCPointerData, QwtSyntheticPointData,
       QwtArraySeriesData< QwtIntervalSample >, QwtArraySeriesData< QPointF >, QwtArraySeriesData< QwtPoint3D >,
       and QwtArraySeriesData< QwtSetSample >.

   template<typename T > void QwtSeriesData< T >::setRectOfInterest (const QRectF &) [virtual] Set a the 'rect
       of interest'
       QwtPlotSeriesItem defines the current area of the plot canvas as 'rect of interest' (
       QwtPlotSeriesItem::updateScaleDiv() ). It can be used to implement different levels of details.

       The default implementation does nothing.

       Reimplemented in QwtSyntheticPointData.

   template<typename T> virtual size_t QwtSeriesData< T >::size () const [pure virtual] Returns:
           Number of samples

       Implemented in QwtArraySeriesData< T >, QwtPointArrayData, QwtCPointerData, QwtSyntheticPointData,
       QwtArraySeriesData< QwtIntervalSample >, QwtArraySeriesData< QPointF >, QwtArraySeriesData< QwtPoint3D >,
       and QwtArraySeriesData< QwtSetSample >.

Member Data Documentation

   template<typename T> QRectF QwtSeriesData< T >::d_boundingRect [mutable, protected]
       Can be used to cache a calculated bounding rectangle.

Author

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

Version 6.0.0                                    Fri Apr 15 2011                                QwtSeriesData(3)