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

NAME

QwtPolygonFData -
Data class containing a single QwtArray<QwtDoublePoint> object.
 

SYNOPSIS

#include <qwt_data.h>
Inherits QwtData.

Public Member Functions


virtual QwtDoubleRect boundingRect () const
 
virtual QwtData * copy () const
 
const QPolygonF & data () const
 
QwtPolygonFData & operator= (const QwtPolygonFData &)
 
QwtPolygonFData (const QPolygonF &)
 
virtual size_t size () const
 
virtual double x (size_t i) const
 
virtual double y (size_t i) const
 

Detailed Description

Data class containing a single QwtArray<QwtDoublePoint> object.

Constructor & Destructor Documentation

QwtPolygonFData::QwtPolygonFData (const QPolygonF &polygon) Constructor

Parameters:
polygon Polygon data
See also:
QwtPlotCurve::setData()
 

Member Function Documentation

QwtDoubleRect QwtData::boundingRect () const [virtual, inherited] 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 QwtArrayData, and QwtCPointerData.

QwtData * QwtPolygonFData::copy () const [virtual] Returns:

Pointer to a copy (virtual copy constructor)
 
Implements QwtData.

const QPolygonF & QwtPolygonFData::data () const Returns:

Point array
 

QwtPolygonFData & QwtPolygonFData::operator= (const QwtPolygonFData &data)

Assignment.

size_t QwtPolygonFData::size () const [virtual] Returns:

Size of the data set
 
Implements QwtData.

double QwtPolygonFData::x (size_ti) const [virtual] Return the x value of data point i

Parameters:
i Index
Returns:
x X value of data point i
 
Implements QwtData.

double QwtPolygonFData::y (size_ti) const [virtual] Return the y value of data point i

Parameters:
i Index
Returns:
y Y value of data point i
 
Implements QwtData.
 

Author

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Mon Aug 1 2011 Version 5.2.2