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       QwtKnob -


       #include <qwt_knob.h>

       Inherits QwtAbstractSlider, and QwtAbstractScale.

   Public Types
       enum Symbol { Line, Dot }

   Public Member Functions
       QwtKnob (QWidget *parent=NULL)
       virtual ~QwtKnob ()
       int borderWidth () const
       int knobWidth () const
       virtual QSize minimumSizeHint () const
       const QwtRoundScaleDraw * scaleDraw () const
       QwtRoundScaleDraw * scaleDraw ()
       void setBorderWidth (int bw)
       void setKnobWidth (int w)
       void setScaleDraw (QwtRoundScaleDraw *)
       void setSymbol (Symbol)
       void setTotalAngle (double angle)
       virtual QSize sizeHint () const
       Symbol symbol () const
       double totalAngle () const

   Protected Member Functions
       void draw (QPainter *p, const QRect &ur)
       void drawKnob (QPainter *p, const QRect &r)
       void drawMarker (QPainter *p, double arc, const QColor &c)
       virtual void paintEvent (QPaintEvent *e)
       virtual void resizeEvent (QResizeEvent *e)

   Additional Inherited Members

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::Symbol

       See also:

Constructor & Destructor Documentation

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

           parent Parent widget

Member Function Documentation

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

           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, doublearc, 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

           e Paint event

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

   const QwtRoundScaleDraw * QwtKnob::scaleDraw () const
           the scale draw of the knob

       See also:

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

       See also:

   void QwtKnob::setBorderWidth (intbw)
       Set the knob's border width. Parameters:
           bw new border width

   void QwtKnob::setKnobWidth (intw)
       Change the knob's width. The specified width must be >= 5, or it will be clipped.

           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:

   void QwtKnob::setSymbol (QwtKnob::Symbols)
       Set the symbol of the knob. See also:

   void QwtKnob::setTotalAngle (doubleangle)
       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]

   QwtKnob::Symbol QwtKnob::symbol () const
           symbol of the knob

       See also:


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