| Qwt User's Guide
    5.2.3
    | 
#include <qwt_data.h>

| 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:
| 
 | 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 in QwtCPointerData, and QwtArrayData.
| 
 | pure virtual | 
Implemented in QwtCPointerData, QwtArrayData, and QwtPolygonFData.
| 
 | pure virtual | 
Implemented in QwtCPointerData, QwtArrayData, and QwtPolygonFData.
| 
 | pure virtual | 
Return the x value of data point i
| i | Index | 
Implemented in QwtCPointerData, QwtArrayData, and QwtPolygonFData.
| 
 | pure virtual | 
Return the y value of data point i
| i | Index | 
Implemented in QwtCPointerData, QwtArrayData, and QwtPolygonFData.
 1.8.1
 1.8.1