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

NAME

QwtCPointerData -
Data class containing two pointers to memory blocks of doubles.
 

SYNOPSIS

#include <qwt_series_data.h>
Inherits QwtSeriesData< QPointF >.

Public Member Functions


QwtCPointerData (const double *x, const double *y, size_t size)
 
virtual QRectF boundingRect () const
 
virtual size_t size () const
 
virtual QPointF sample (size_t i) const
 
const double * xData () const
 
const double * yData () const
 

Detailed Description

Data class containing two pointers to memory blocks of doubles.

Constructor & Destructor Documentation

QwtCPointerData::QwtCPointerData (const double *x, const double *y, size_tsize) Constructor

Parameters:
x Array of x values
 
y Array of y values
 
size Size 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 rect. 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_ti) const [virtual] Return the sample at position i

Parameters:
i Index
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
 
 

Author

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Fri Apr 15 2011 Version 6.0.0