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

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