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
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 ...
QwtData * QwtPolygonFData::copy () const [virtual] Returns:¶
Pointer to a copy (virtual copy
constructor)
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
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
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
Author¶
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