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QwtStdVectorData Class Reference

Inheritance diagram for QwtStdVectorData:

QwtData List of all members.

Detailed Description

Data class containing two std::vector<double> objects.

QwtStdVectorData shows how to speed up calls to boundingRect() by caching. Caching is safe due to the copy semantics of std::vector (immediate copy on assignment).


Public Member Functions

 QwtStdVectorData (const std::vector< double > &x, const std::vector< double > &y)
QwtStdVectorDataoperator= (const QwtStdVectorData &)
virtual QwtDatacopy () const
virtual size_t size () const
virtual double x (size_t i) const
virtual double y (size_t i) const
virtual QwtDoubleRect boundingRect () const


Constructor & Destructor Documentation

QwtStdVectorData::QwtStdVectorData const std::vector< double > &  x,
const std::vector< double > &  y
 

Constructor

See also:
QwtCurve::setData and QwtPlot::setCurveData.


Member Function Documentation

QwtDoubleRect QwtStdVectorData::boundingRect  )  const [virtual]
 

Returns the bounding rectangle of the data. If there is no bounding rect, like for empty data the rectangle is invalid: QwtDoubleRect::isValid() == FALSE

Reimplemented from QwtData.

QwtData * QwtStdVectorData::copy  )  const [virtual]
 

Return a pointer to a copy (virtual copy constructor)

Implements QwtData.

size_t QwtStdVectorData::size  )  const [virtual]
 

Return the size of the data set

Implements QwtData.

double QwtStdVectorData::x size_t  i  )  const [virtual]
 

Return the x value of data point i

Parameters:
i Index
Returns:
x X value of data point i

Implements QwtData.

double QwtStdVectorData::y size_t  i  )  const [virtual]
 

Return the y value of data point i

Parameters:
i Index
Returns:
y Y value of data point i

Implements QwtData.


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