QwtKnob(3)

NAME
QwtKnob - The Knob Widget.

SYNOPSIS

#include <qwt_knob.h>

Inherits QwtSliderBase, and QwtScaleIf.

  Public Types
enum Symbol { Line, Dot }

  Public Methods
QwtKnob (QWidget *parent=0, const char *name=0)
virtual ~QwtKnob ()
void setKnobWidth (int w)
void setTotalAngle (double angle)
void setBorderWidth (int bw)
void setSymbol (Symbol)
Symbol symbol () const
virtual QSize sizeHint () const
virtual QSize minimumSizeHint () const
virtual QSizePolicy sizePolicy () const

  Protected Methods
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 QwtScaleIf). Automatic scrolling is enabled when the user presses a mouse button on the scale. For a description of signals, slots and other members, see QwtSliderBase.

See also:
QwtSliderBase and QwtScaleIf for the descriptions of the inherited members.

MEMBER ENUMERATION DOCUMENTATION

  enum QwtKnob::Symbol

Symbol

See also:
QwtKnob::QwtKnob()

CONSTRUCTOR & DESTRUCTOR DOCUMENTATION

  QwtKnob::QwtKnob (QWidget * parent = 0, const char * name = 0)

Constructor.

Parameters:

parent
    Parent widget

name
    Name

  QwtKnob::~QwtKnob () [virtual]

Destructor.

MEMBER FUNCTION DOCUMENTATION

  void QwtKnob::draw (QPainter * p, const QRect & ur) [protected]

Repaint the knob.

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

Draw the knob.

Parameters:

p   painter

r   borders of the knob

  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

  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.

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

Qt Resize Event.

  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::setSymbol (QwtKnob::Symbol s)

Set the symbol of the knob.

See also:
QwtKnob::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:
QwtKnob::minimumSizeHint()

  QSizePolicy QwtKnob::sizePolicy () const [virtual]

Returns:
Fixed/Fixed.

  QwtKnob::Symbol QwtKnob::symbol () const

Returns:
symbol of the knob

See also:
QwtKnob::setSymbol()

AUTHOR

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