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QwtKnob

NAME

QwtKnob -

The Knob Widget.

SYNOPSIS

#include <qwt_knob.h>

Inherits QwtAbstractSlider, and QwtAbstractScale.

Public Types

enum Symbol { Line, Dot }

Public Member Functions

QwtKnob (QWidget *parent=NULL)

virtual ~QwtKnob ()

void setKnobWidth (int w)

int knobWidth () const

void setTotalAngle (double angle)

double totalAngle () const

void setBorderWidth (int bw)

int borderWidth () const

void setSymbol (Symbol)

Symbol symbol () const

virtual QSize sizeHint () const

virtual QSize minimumSizeHint () const

void setScaleDraw (QwtRoundScaleDraw *)

const QwtRoundScaleDraw * scaleDraw () const

QwtRoundScaleDraw * scaleDraw ()

Protected Member Functions

virtual void paintEvent (QPaintEvent *e)

virtual void resizeEvent (QResizeEvent *e)

void draw (QPainter *p, const QRect &ur)

void drawKnob (QPainter *p, const QRect &r)

void drawMarker (QPainter *p, double arc, const QColor &c)

Detailed Description

The Knob Widget.

The QwtKnob widget imitates look and behaviour of a volume knob on a radio. It contains a scale around the knob which is set up automatically or can be configured manually (see QwtAbstractScale). Automatic scrolling is enabled when the user presses a mouse button on the scale. For a description of signals, slots and other members, see QwtAbstractSlider.

 

See also:

QwtAbstractSlider and QwtAbstractScale for the descriptions of the inherited members.

Member Enumeration Documentation

enum QwtKnob::SymbolSymbol

See also:

QwtKnob::QwtKnob()

Constructor & Destructor Documentation

QwtKnob::QwtKnob (QWidget * parent = NULL) [explicit]Constructor

Parameters:

parent Parent widget

QwtKnob::~QwtKnob () [virtual]

Destructor.

Member Function Documentation

int QwtKnob::borderWidth () const

Return the border width.

void QwtKnob::draw (QPainter * painter, const QRect & rect) [protected]Repaint the knob

Parameters:

painter Painter
rect Update rectangle

void QwtKnob::drawKnob (QPainter * painter, const QRect & r) [protected]

Draw the knob. Parameters:

painter painter
r Bounding rectangle of the knob (without scale)

void QwtKnob::drawMarker (QPainter * p, double arc, const QColor & c) [protected]

Draw the marker at the knob's front. Parameters:

p Painter
arc Angle of the marker
c Marker color

int QwtKnob::knobWidth () const

Return the width of the knob.

QSize QwtKnob::minimumSizeHint () const [virtual]

Return a minimum size hint. Warning:

The return value of QwtKnob::minimumSizeHint() depends on the font and the scale.

void QwtKnob::paintEvent (QPaintEvent * e) [protected, virtual]Repaint the knob

Parameters:

e Paint event

void QwtKnob::resizeEvent (QResizeEvent * e) [protected, virtual]Qt Resize Event

QwtRoundScaleDraw * QwtKnob::scaleDraw ()Returns:

the scale draw of the knob

See also:

setScaleDraw()

const QwtRoundScaleDraw * QwtKnob::scaleDraw () constReturns:

the scale draw of the knob

See also:

setScaleDraw()

void QwtKnob::setBorderWidth (int bw)

Set the knob's border width. Parameters:

bw new border width

void QwtKnob::setKnobWidth (int w)

Change the knob's width. The specified width must be >= 5, or it will be clipped.

Parameters:

w New width

void QwtKnob::setScaleDraw (QwtRoundScaleDraw * scaleDraw)Change the scale draw of the knob

For changing the labels of the scales, it is necessary to derive from QwtRoundScaleDraw and overload QwtRoundScaleDraw::label().

See also:

scaleDraw()

void QwtKnob::setSymbol (QwtKnob::Symbol s)

Set the symbol of the knob. See also:

symbol()

void QwtKnob::setTotalAngle (double angle)

Set the total angle by which the knob can be turned. Parameters:

angle Angle in degrees.

The default angle is 270 degrees. It is possible to specify an angle of more than 360 degrees so that the knob can be turned several times around its axis.

QSize QwtKnob::sizeHint () const [virtual]Returns:

minimumSizeHint()

QwtKnob::Symbol QwtKnob::symbol () constReturns:

symbol of the knob

See also:

setSymbol()

double QwtKnob::totalAngle () const

Return the total angle.

Author

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