| Qwt User's Guide
    6.0.2
    | 
#include <qwt_knob.h>

| Public Types | |
| enum | KnobStyle { NoStyle = -1, Raised, Sunken } | 
| enum | MarkerStyle { NoMarker = -1, Tick, Dot, Nub, Notch } | 
|  Public Types inherited from QwtAbstractSlider | |
| enum | ScrollMode { ScrNone, ScrMouse, ScrTimer, ScrDirect, ScrPage } | 
| Public Member Functions | |
| QwtKnob (QWidget *parent=NULL) | |
| virtual | ~QwtKnob () | 
| int | borderWidth () const | 
| KnobStyle | knobStyle () const | 
| int | knobWidth () const | 
| int | markerSize () const | 
| MarkerStyle | markerStyle () const | 
| virtual QSize | minimumSizeHint () const | 
| const QwtRoundScaleDraw * | scaleDraw () const | 
| QwtRoundScaleDraw * | scaleDraw () | 
| void | setBorderWidth (int bw) | 
| void | setKnobStyle (KnobStyle) | 
| void | setKnobWidth (int w) | 
| void | setMarkerSize (int) | 
| void | setMarkerStyle (MarkerStyle) | 
| void | setScaleDraw (QwtRoundScaleDraw *) | 
| void | setTotalAngle (double angle) | 
| virtual QSize | sizeHint () const | 
| double | totalAngle () const | 
|  Public Member Functions inherited from QwtAbstractSlider | |
| QwtAbstractSlider (Qt::Orientation, QWidget *parent=NULL) | |
| virtual | ~QwtAbstractSlider () | 
| bool | isReadOnly () const | 
| bool | isValid () const | 
| virtual double | mass () const | 
| Qt::Orientation | orientation () const | 
| virtual void | setMass (double val) | 
| virtual void | setOrientation (Qt::Orientation o) | 
| void | setTracking (bool enable) | 
| void | setUpdateTime (int t) | 
| void | setValid (bool valid) | 
| void | stopMoving () | 
|  Public Member Functions inherited from QwtDoubleRange | |
| QwtDoubleRange () | |
| virtual | ~QwtDoubleRange () | 
| virtual void | incPages (int) | 
| double | maxValue () const | 
| double | minValue () const | 
| int | pageSize () const | 
| bool | periodic () const | 
| void | setPeriodic (bool tf) | 
| void | setRange (double vmin, double vmax, double vstep=0.0, int pagesize=1) | 
| void | setStep (double) | 
| double | step () const | 
| double | value () const | 
|  Public Member Functions inherited from QwtAbstractScale | |
| QwtAbstractScale () | |
| virtual | ~QwtAbstractScale () | 
| bool | autoScale () const | 
| const QwtScaleEngine * | scaleEngine () const | 
| QwtScaleEngine * | scaleEngine () | 
| const QwtScaleMap & | scaleMap () const | 
| int | scaleMaxMajor () const | 
| int | scaleMaxMinor () const | 
| void | setAutoScale () | 
| void | setScale (double vmin, double vmax, double step=0.0) | 
| void | setScale (const QwtInterval &, double step=0.0) | 
| void | setScale (const QwtScaleDiv &) | 
| void | setScaleEngine (QwtScaleEngine *) | 
| void | setScaleMaxMajor (int ticks) | 
| void | setScaleMaxMinor (int ticks) | 
| Protected Member Functions | |
| virtual void | changeEvent (QEvent *) | 
| virtual void | drawKnob (QPainter *, const QRectF &) const | 
| virtual void | drawMarker (QPainter *, const QRectF &, double arc) const | 
| virtual void | getScrollMode (const QPoint &, QwtAbstractSlider::ScrollMode &, int &direction) const | 
| virtual double | getValue (const QPoint &p) | 
| virtual void | paintEvent (QPaintEvent *) | 
| virtual void | resizeEvent (QResizeEvent *) | 
|  Protected Member Functions inherited from QwtAbstractSlider | |
| virtual void | keyPressEvent (QKeyEvent *e) | 
| virtual void | mouseMoveEvent (QMouseEvent *e) | 
| double | mouseOffset () const | 
| virtual void | mousePressEvent (QMouseEvent *e) | 
| virtual void | mouseReleaseEvent (QMouseEvent *e) | 
| int | scrollMode () const | 
| void | setMouseOffset (double) | 
| virtual void | setPosition (const QPoint &) | 
| virtual void | timerEvent (QTimerEvent *e) | 
| virtual void | wheelEvent (QWheelEvent *e) | 
|  Protected Member Functions inherited from QwtDoubleRange | |
| double | exactPrevValue () const | 
| double | exactValue () const | 
| double | prevValue () const | 
| virtual void | stepChange () | 
|  Protected Member Functions inherited from QwtAbstractScale | |
| const QwtAbstractScaleDraw * | abstractScaleDraw () const | 
| QwtAbstractScaleDraw * | abstractScaleDraw () | 
| void | rescale (double vmin, double vmax, double step=0.0) | 
| void | setAbstractScaleDraw (QwtAbstractScaleDraw *) | 
| Additional Inherited Members | |
|  Public Slots inherited from QwtAbstractSlider | |
| virtual void | fitValue (double val) | 
| virtual void | incValue (int steps) | 
| virtual void | setReadOnly (bool) | 
| virtual void | setValue (double val) | 
|  Signals inherited from QwtAbstractSlider | |
| void | sliderMoved (double value) | 
| void | sliderPressed () | 
| void | sliderReleased () | 
| void | valueChanged (double value) | 
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.
 
| enum QwtKnob::KnobStyle | 
Style of the knob surface.
Depending on the KnobStyle the surface of the knob is filled from the brushes of the widget palette().
| enum QwtKnob::MarkerStyle | 
Marker type.
The marker indicates the current value on the knob The default setting is a Notch marker.
| 
 | explicit | 
Constructor
| parent | Parent widget | 
| 
 | protectedvirtual | 
Handle QEvent::StyleChange and QEvent::FontChange;
| event | Change event | 
| 
 | protectedvirtual | 
Draw the knob.
| painter | painter | 
| knobRect | Bounding rectangle of the knob (without scale) | 
| 
 | protectedvirtual | 
Draw the marker at the knob's front.
| painter | Painter | 
| rect | Bounding rectangle of the knob without scale | 
| angle | Angle of the marker in degrees | 
| 
 | protectedvirtual | 
Set the scrolling mode and direction.
Called by QwtAbstractSlider
| pos | Point in question | 
| scrollMode | Scrolling mode | 
| direction | Direction | 
Implements QwtAbstractSlider.
| 
 | protectedvirtual | 
Determine the value corresponding to a specified position.
Called by QwtAbstractSlider
| pos | point | 
Implements QwtAbstractSlider.
| QwtKnob::KnobStyle QwtKnob::knobStyle | ( | ) | const | 
| QwtKnob::MarkerStyle QwtKnob::markerStyle | ( | ) | const | 
| 
 | virtual | 
Return a minimum size hint.
| 
 | protectedvirtual | 
Repaint the knob
| event | Paint event | 
| 
 | protectedvirtual | 
Qt Resize Event
| event | Resize event | 
| const QwtRoundScaleDraw * QwtKnob::scaleDraw | ( | ) | const | 
| QwtRoundScaleDraw * QwtKnob::scaleDraw | ( | ) | 
| void QwtKnob::setBorderWidth | ( | int | borderWidth | ) | 
Set the knob's border width.
| borderWidth | new border width | 
| void QwtKnob::setKnobStyle | ( | KnobStyle | knobStyle | ) | 
| void QwtKnob::setKnobWidth | ( | int | width | ) | 
Change the knob's width.
The specified width must be >= 5, or it will be clipped.
| width | New width | 
| void QwtKnob::setMarkerSize | ( | int | size | ) | 
Set the size of the marker.
| void QwtKnob::setMarkerStyle | ( | MarkerStyle | markerStyle | ) | 
Set the marker type of the knob.
| markerStyle | Marker type | 
| 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().
| void QwtKnob::setTotalAngle | ( | double | angle | ) | 
Set the total angle by which the knob can be turned.
| 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.
| 
 | virtual | 
 1.8.1
 1.8.1