Qwt User's Guide  6.1.0
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QwtIntervalSymbol Class Reference

A drawing primitive for displaying an interval like an error bar. More...

#include <qwt_interval_symbol.h>

Public Types

enum  Style { NoSymbol = -1, Bar, Box, UserSymbol = 1000 }
 Symbol style. More...
 

Public Member Functions

 QwtIntervalSymbol (Style=NoSymbol)
 
 QwtIntervalSymbol (const QwtIntervalSymbol &)
 Copy constructor.
 
virtual ~QwtIntervalSymbol ()
 Destructor.
 
QwtIntervalSymboloperator= (const QwtIntervalSymbol &)
 Assignment operator.
 
bool operator== (const QwtIntervalSymbol &) const
 Compare two symbols.
 
bool operator!= (const QwtIntervalSymbol &) const
 Compare two symbols.
 
void setWidth (int)
 
int width () const
 
void setBrush (const QBrush &b)
 Assign a brush. More...
 
const QBrush & brush () const
 
void setPen (const QColor &, qreal width=0.0, Qt::PenStyle=Qt::SolidLine)
 
void setPen (const QPen &)
 
const QPen & pen () const
 
void setStyle (Style)
 
Style style () const
 
virtual void draw (QPainter *, Qt::Orientation, const QPointF &from, const QPointF &to) const
 

Detailed Description

A drawing primitive for displaying an interval like an error bar.

See Also
QwtPlotIntervalCurve

Member Enumeration Documentation

Symbol style.

Enumerator
NoSymbol 

No Style. The symbol cannot be drawn.

Bar 

The symbol displays a line with caps at the beginning/end. The size of the caps depends on the symbol width().

Box 

The symbol displays a plain rectangle using pen() and brush(). The size of the rectangle depends on the translated interval and the width(),

UserSymbol 

Styles >= UserSymbol are reserved for derived classes of QwtIntervalSymbol that overload draw() with additional application specific symbol types.

Constructor & Destructor Documentation

QwtIntervalSymbol::QwtIntervalSymbol ( Style  style = NoSymbol)

Constructor

Parameters
styleStyle of the symbol
See Also
setStyle(), style(), Style

Member Function Documentation

const QBrush & QwtIntervalSymbol::brush ( ) const
Returns
Brush
See Also
setBrush()
void QwtIntervalSymbol::draw ( QPainter *  painter,
Qt::Orientation  orientation,
const QPointF &  from,
const QPointF &  to 
) const
virtual

Draw a symbol depending on its style

Parameters
painterPainter
orientationOrientation
fromStart point of the interval in target device coordinates
toEnd point of the interval in target device coordinates
See Also
setStyle()
const QPen & QwtIntervalSymbol::pen ( ) const
Returns
Pen
See Also
setPen(), brush()
void QwtIntervalSymbol::setBrush ( const QBrush &  brush)

Assign a brush.

The brush is used for the Box style.

Parameters
brushBrush
See Also
brush()
void QwtIntervalSymbol::setPen ( const QColor &  color,
qreal  width = 0.0,
Qt::PenStyle  style = Qt::SolidLine 
)

Build and assign a pen

In Qt5 the default pen width is 1.0 ( 0.0 in Qt4 ) what makes it non cosmetic ( see QPen::isCosmetic() ). This method has been introduced to hide this incompatibility.

Parameters
colorPen color
widthPen width
stylePen style
See Also
pen(), brush()
void QwtIntervalSymbol::setPen ( const QPen &  pen)

Assign a pen

Parameters
penPen
See Also
pen(), setBrush()
void QwtIntervalSymbol::setStyle ( Style  style)

Specify the symbol style

Parameters
styleStyle
See Also
style(), Style
void QwtIntervalSymbol::setWidth ( int  width)

Specify the width of the symbol It is used depending on the style.

Parameters
widthWidth
See Also
width(), setStyle()
QwtIntervalSymbol::Style QwtIntervalSymbol::style ( ) const
Returns
Current symbol style
See Also
setStyle()
int QwtIntervalSymbol::width ( ) const
Returns
Width of the symbol.
See Also
setWidth(), setStyle()