QwtKnob - The Knob Widget.

       Generated automatically by Doxygen for Qwt User's Guide from the source code.

Version 6.1.4                                    Wed Jan 2 2019                                       QwtKnob(3)

QwtKnob::QwtKnob(QWidget*parent=NULL)[explicit]
       Constructor. Construct a knob with an angle of 270°. The style is QwtKnob::Raised and the marker style is
       QwtKnob::Notch. The width of the knob is set to 50 pixels.

       Parameters:parent Parent widget

       Seealso:setTotalAngle()

       The Knob Widget.

       The QwtKnob widget imitates look and behavior of a volume knob on a radio. It looks similar to QDial -
       not to QwtDial.

       The value range of a knob might be divided into several turns.

       The layout of the knob depends on the knobWidth().

       • width  > 0 The diameter of the knob is fixed and the knob is aligned according to the alignment() flags
         inside of the contentsRect().

       • width <= 0 The knob is extended to the minimum of width/height of the contentsRect() and aligned in the
         other direction according to alignment().

       Setting a fixed knobWidth() is helpful to align several knobs with different scale labels.

enumQwtKnob::KnobStyle
       Style of the knob surface. Depending on the KnobStyle the surface of the knob is filled from the  brushes
       of the widget palette().

       Seealso:setKnobStyle(), knobStyle()EnumeratorFlat   Fill the knob with a brush from QPalette::Button.

       Raised Build a gradient from QPalette::Midlight and QPalette::Button.

       Sunken Build a gradient from QPalette::Midlight, QPalette::Button and QPalette::Midlight

       Styled Build a radial gradient from QPalette::Button like it is used for QDial in various Qt styles.

   enumQwtKnob::MarkerStyle
       Marker type. The marker indicates the current value on the knob The default setting is a Notch marker.

       Seealso:setMarkerStyle(), setMarkerSize()EnumeratorNoMarker
              Don't paint any marker.

       Tick   Paint a single tick in QPalette::ButtonText color.

       Triangle
              Paint a triangle in QPalette::ButtonText color.

       Dot    Paint a circle in QPalette::ButtonText color.

       Nub    Draw a raised ellipse with a gradient build from QPalette::Light and QPalette::Mid

       Notch  Draw a sunken ellipse with a gradient build from QPalette::Light and QPalette::Mid

Qt::AlignmentQwtKnob::alignment()constReturns:
           Alignment of the knob inside of contentsRect()

       Seealso:setAlignment(), knobWidth(), knobRect()voidQwtKnob::changeEvent(QEvent*event)[protected],[virtual]
       Handle QEvent::StyleChange and QEvent::FontChange;

       Parameters:event Change event

   voidQwtKnob::drawFocusIndicator(QPainter*painter)const[protected],[virtual]
       Draw the focus indicator

       Parameters:painter Painter

   voidQwtKnob::drawKnob(QPainter*painter,constQRectF&knobRect)const[protected],[virtual]
       Draw the knob.

       Parameters:painter painter
           knobRect Bounding rectangle of the knob (without scale)

   voidQwtKnob::drawMarker(QPainter*painter,constQRectF&rect,doubleangle)const[protected],[virtual]
       Draw the marker at the knob's front.

       Parameters:painter Painter
           rect Bounding rectangle of the knob without scale
           angle Angle of the marker in degrees ( clockwise, 0 at the 12 o'clock position )

   boolQwtKnob::isScrollPosition(constQPoint&pos)const[protected],[virtual]
       Determine what to do when the user presses a mouse button.

       Parameters:pos Mouse position

       Returnvalues:True,when pos is inside the circle of the knob.

       Seealso:scrolledTo()

       Implements QwtAbstractSlider.

   QRectQwtKnob::knobRect()const
       Calculate the bounding rectangle of the knob without the scale

       Returns:
           Bounding rectangle of the knob

       Seealso:knobWidth(), alignment(), QWidget::contentsRect()

   QwtKnob::KnobStyleQwtKnob::knobStyle()constReturns:
           Marker type of the knob

       Seealso:setKnobStyle(), setBorderWidth()intQwtKnob::markerSize()constReturns:
           Marker size

       Seealso:setMarkerSize()QwtKnob::MarkerStyleQwtKnob::markerStyle()constReturns:
           Marker type of the knob

       Seealso:setMarkerStyle(), setMarkerSize()QSizeQwtKnob::minimumSizeHint()const[virtual]Returns:
           Minimum size hint

       Seealso:sizeHint()intQwtKnob::numTurns()constReturns:
           Number of turns.

       When the total angle is below 360° numTurns() is ceiled to 1.

       Seealso:setNumTurns(), setTotalAngle(), totalAngle()voidQwtKnob::paintEvent(QPaintEvent*event)[protected],[virtual]
       Repaint the knob

       Parameters:event Paint event

   constQwtRoundScaleDraw*QwtKnob::scaleDraw()constReturns:
           the scale draw of the knob

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

       Seealso:setScaleDraw()doubleQwtKnob::scrolledTo(constQPoint&pos)const[protected],[virtual]
       Determine the value for a new position of the mouse.

       Parameters:pos Mouse position

       Returns:
           Value for the mouse position

       Seealso:isScrollPosition()

       Implements QwtAbstractSlider.

   voidQwtKnob::setAlignment(Qt::Alignmentalignment)
       Set the alignment of the knob. Similar to a QLabel::alignment() the flags decide how to  align  the  knob
       inside of contentsRect().

       The default setting is Qt::AlignCenter

       Parameters:alignment Or'd alignment flags

       Seealso:alignment(), setKnobWidth(), knobRect()voidQwtKnob::setBorderWidth(intborderWidth)
       Set the knob's border width.

       Parameters:borderWidth new border width

   voidQwtKnob::setKnobStyle(KnobStyleknobStyle)
       Set the knob type.

       Parameters:knobStyle Knob type

       Seealso:knobStyle(), setBorderWidth()voidQwtKnob::setKnobWidth(intwidth)
       Change  the  knob's  width.  Setting  a  fixed value for the diameter of the knob is helpful for aligning
       several knobs in a row.

       Parameters:width New width

       Seealso:knobWidth(), setAlignment()Note:
           Modifies the sizePolicy()

   voidQwtKnob::setMarkerSize(intsize)
       Set the size of the marker. When setting a size <= 0 the marker will automatically scaled to 40%  of  the
       radius of the knob.

       Seealso:markerSize(), markerStyle()voidQwtKnob::setMarkerStyle(MarkerStylemarkerStyle)
       Set the marker type of the knob.

       Parameters:markerStyle Marker type

       Seealso:markerStyle(), setMarkerSize()voidQwtKnob::setNumTurns(intnumTurns)
       Set the number of turns. When numTurns > 1 the knob can be turned several times around its axis

       • otherwise the total angle is floored to 360°.

       Seealso:numTurns(), totalAngle(), setTotalAngle()voidQwtKnob::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().

       Seealso:scaleDraw()voidQwtKnob::setTotalAngle(doubleangle)
       Set the total angle by which the knob can be turned.

       Parameters:angle Angle in degrees.

       The angle has to be between [10, 360] degrees. Angles above 360 ( so that the knob can be turned  several
       times around its axis ) have to be set using setNumTurns().

       The default angle is 270 degrees.

       Seealso:totalAngle(), setNumTurns()QSizeQwtKnob::sizeHint()const[virtual]Returns:sizeHint()doubleQwtKnob::totalAngle()constReturns:
           the total angle

       Seealso:setTotalAngle(), setNumTurns(), numTurns()

       QwtKnob - The Knob Widget.

       #include <qwt_knob.h>

       Inherits QwtAbstractSlider.

   PublicTypes
       enum KnobStyle { Flat, Raised, Sunken, Styled }
           Style of the knob surface.
       enum MarkerStyle { NoMarker = -1, Tick, Triangle, Dot, Nub, Notch }
           Marker type.

   PublicMemberFunctionsQwtKnob (QWidget *parent=NULL)
           Constructor.
       virtual ~QwtKnob ()
           Destructor.
       void setAlignment (Qt::Alignment)
           Set the alignment of the knob.
       Qt::Alignment alignment () const
       void setKnobWidth (int)
           Change the knob's width.
       int knobWidth () const
           Return the width of the knob.
       void setNumTurns (int)
           Set the number of turns.
       int numTurns () const
       void setTotalAngle (double angle)
           Set the total angle by which the knob can be turned.
       double totalAngle () const
       void setKnobStyle (KnobStyle)
           Set the knob type.
       KnobStyleknobStyle () const
       void setBorderWidth (int)
           Set the knob's border width.
       int borderWidth () const
           Return the border width.
       void setMarkerStyle (MarkerStyle)
           Set the marker type of the knob.
       MarkerStylemarkerStyle () const
       void setMarkerSize (int)
           Set the size of the marker.
       int markerSize () const
       virtual QSize sizeHint () const
       virtual QSize minimumSizeHint () const
       void setScaleDraw (QwtRoundScaleDraw *)
       const QwtRoundScaleDraw * scaleDraw () const
       QwtRoundScaleDraw * scaleDraw ()
       QRect knobRect () const

   ProtectedMemberFunctions
       virtual void paintEvent (QPaintEvent *)
       virtual void changeEvent (QEvent *)
       virtual void drawKnob (QPainter *, const QRectF &) const
           Draw the knob.
       virtual void drawFocusIndicator (QPainter *) const
       virtual void drawMarker (QPainter *, const QRectF &, double angle) const
           Draw the marker at the knob's front.
       virtual double scrolledTo (const QPoint &) const
           Determine the value for a new position of the mouse.
       virtual bool isScrollPosition (const QPoint &) const
           Determine what to do when the user presses a mouse button.

   AdditionalInheritedMembers