Qwt User's Guide  6.1.3
QwtCPointerData Class Reference

Data class containing two pointers to memory blocks of doubles. More...

#include <qwt_point_data.h>

Inheritance diagram for QwtCPointerData:

Public Member Functions

 QwtCPointerData (const double *x, const double *y, size_t size)
 
virtual QRectF boundingRect () const
 Calculate the bounding rectangle. More...
 
virtual size_t size () const
 
virtual QPointF sample (size_t i) const
 
const double * xData () const
 
const double * yData () const
 
- Public Member Functions inherited from QwtSeriesData< QPointF >
 QwtSeriesData ()
 Constructor.
 
virtual ~QwtSeriesData ()
 Destructor.
 
virtual void setRectOfInterest (const QRectF &rect)
 

Additional Inherited Members

- Protected Attributes inherited from QwtSeriesData< QPointF >
QRectF d_boundingRect
 Can be used to cache a calculated bounding rectangle.
 

Detailed Description

Data class containing two pointers to memory blocks of doubles.

Constructor & Destructor Documentation

QwtCPointerData::QwtCPointerData ( const double *  x,
const double *  y,
size_t  size 
)

Constructor

Parameters
xArray of x values
yArray of y values
sizeSize of the x and y arrays
Warning
The programmer must assure that the memory blocks referenced by the pointers remain valid during the lifetime of the QwtPlotCPointer object.
See also
QwtPlotCurve::setData(), QwtPlotCurve::setRawSamples()

Member Function Documentation

QRectF QwtCPointerData::boundingRect ( ) const
virtual

Calculate the bounding rectangle.

The bounding rectangle is calculated once by iterating over all points and is stored for all following requests.

Returns
Bounding rectangle

Implements QwtSeriesData< QPointF >.

QPointF QwtCPointerData::sample ( size_t  index) const
virtual

Return the sample at position i

Parameters
indexIndex
Returns
Sample at position i

Implements QwtSeriesData< QPointF >.

size_t QwtCPointerData::size ( ) const
virtual
Returns
Size of the data set

Implements QwtSeriesData< QPointF >.

const double * QwtCPointerData::xData ( ) const
Returns
Array of the x-values
const double * QwtCPointerData::yData ( ) const
Returns
Array of the y-values