QwtCPointerData - Man Page
Data class containing two pointers to memory blocks of doubles.
Synopsis
#include <qwt_point_data.h>
Inherits QwtSeriesData< QPointF >.
Public Member Functions
QwtCPointerData (const double *x, const double *y, size_t size)
virtual QRectF boundingRect () const
Calculate the bounding rectangle.
virtual size_t size () const
virtual QPointF sample (size_t index) const
const double * xData () const
const double * yData () const
Additional Inherited Members
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
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 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
index 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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