QwtData (3)

#include <qwt_data.h>

Inherited by QwtArrayData, QwtCPointerData, and QwtPolygonFData.

Public Member Functions

QwtData ()

virtual ~QwtData ()

virtual QwtDoubleRect boundingRect () const

virtual QwtData * copy () const =0

virtual size_t size () const =0

virtual double x (size_t i) const =0

virtual double y (size_t i) const =0

Protected Member Functions

QwtData & operator= (const QwtData &)

QwtData defines an interface to any type of curve data.

Classes, derived from QwtData may:

• store the data in almost any type of container

• calculate the data on the fly instead of storing it

QwtDoubleRect QwtData::boundingRect () const\fC [virtual]\fP

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

Warning:

This is an slow implementation iterating over all points. It is intended to be overloaded by derived classes. In case of auto scaling boundingRect() is called for every replot, so it might be worth to implement a cache, or use x(0), x(size() - 1) for ordered data ...

Reimplemented in QwtCPointerData, and QwtArrayData.

virtual \fBQwtData\fP* QwtData::copy () const\fC [pure virtual]\fP

Returns:

Pointer to a copy (virtual copy constructor)

Implemented in QwtCPointerData, QwtArrayData, and QwtPolygonFData.

\fBQwtData\fP& QwtData::operator= (const \fBQwtData\fP &)\fC [protected]\fP

Assignment operator (virtualized)

virtual size_t QwtData::size () const\fC [pure virtual]\fP

Returns:

Size of the data set

Implemented in QwtCPointerData, QwtArrayData, and QwtPolygonFData.

virtual double QwtData::x (size_ti) const\fC [pure virtual]\fP

Return the x value of data point i

Parameters:

i Index

Returns:

x X value of data point i

Implemented in QwtCPointerData, QwtArrayData, and QwtPolygonFData.

virtual double QwtData::y (size_ti) const\fC [pure virtual]\fP

Return the y value of data point i

Parameters:

i Index

Returns:

y Y value of data point i

Implemented in QwtCPointerData, QwtArrayData, and QwtPolygonFData.

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