QwtDialNeedle man page

QwtDialNeedle —

Base class for needles that can be used in a QwtDial.


#include <qwt_dial_needle.h>

Inherited by QwtCompassMagnetNeedle, QwtCompassWindArrow, and QwtDialSimpleNeedle.

Public Member Functions

virtual void draw (QPainter *painter, const QPoint &center, int length, double direction, QPalette::ColorGroup cg=QPalette::Active) const =0

const QPalette & palette () const

QwtDialNeedle ()

virtual void setPalette (const QPalette &)

virtual ~QwtDialNeedle ()

Static Protected Member Functions

static void drawKnob (QPainter *, const QPoint &pos, int width, const QBrush &, bool sunken)

Detailed Description

Base class for needles that can be used in a QwtDial.

QwtDialNeedle is a pointer that indicates a value by pointing to a specific direction.

Qwt is missing a set of good looking needles. Contributions are very welcome.

See also:

QwtDial, QwtCompass

Constructor & Destructor Documentation

QwtDialNeedle::QwtDialNeedle ()


QwtDialNeedle::~QwtDialNeedle () [virtual]


Member Function Documentation

virtual void QwtDialNeedle::draw (QPainter *painter, const QPoint &center, intlength, doubledirection, QPalette::ColorGroupcg = QPalette::Active) const [pure virtual] Draw the needle


painter Painter
center Center of the dial, start position for the needle
length Length of the needle
direction Direction of the needle, in degrees counter clockwise
cg Color group, used for painting

Implemented in QwtDialSimpleNeedle, QwtCompassMagnetNeedle, and QwtCompassWindArrow.

void QwtDialNeedle::drawKnob (QPainter *painter, const QPoint &pos, intwidth, const QBrush &brush, boolsunken) [static, protected]

Draw the knob.

const QPalette & QwtDialNeedle::palette () const Returns

the palette of the needle.

void QwtDialNeedle::setPalette (const QPalette &palette) [virtual] Sets the palette for the needle.


palette New Palette


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Qwt User's Guide Version 5.2.2 Mon Aug 1 2011