Qwt User's Guide
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.
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

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()

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()
Returns:
Current symbol style
See also:
setStyle()
int QwtIntervalSymbol::width ( ) const
Returns:
Width of the symbol.
See also:
setWidth(), setStyle()

List of all members.

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