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Qwt User's Guide 6.0.0
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The Knob Widget. More...
#include <qwt_knob.h>

Public Types | |
| enum | KnobStyle { NoStyle = -1, Raised, Sunken } |
| enum | MarkerStyle { NoMarker = -1, Tick, Dot, Nub, Notch } |
Public Member Functions | |
| QwtKnob (QWidget *parent=NULL) | |
| virtual | ~QwtKnob () |
| void | setKnobWidth (int w) |
| int | knobWidth () const |
| void | setTotalAngle (double angle) |
| double | totalAngle () const |
| void | setKnobStyle (KnobStyle) |
| KnobStyle | knobStyle () const |
| void | setBorderWidth (int bw) |
| int | borderWidth () const |
| void | setMarkerStyle (MarkerStyle) |
| MarkerStyle | markerStyle () const |
| void | setMarkerSize (int) |
| int | markerSize () 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 *) |
| virtual void | resizeEvent (QResizeEvent *) |
| virtual void | changeEvent (QEvent *) |
| virtual void | drawKnob (QPainter *, const QRectF &) const |
| virtual void | drawMarker (QPainter *, const QRectF &, double arc) const |
| virtual double | getValue (const QPoint &p) |
| virtual void | getScrollMode (const QPoint &, QwtAbstractSlider::ScrollMode &, int &direction) const |
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.
| QwtKnob::QwtKnob | ( | QWidget * | parent = NULL | ) | [explicit] |
Constructor
| parent | Parent widget |
| QwtKnob::~QwtKnob | ( | ) | [virtual] |
Destructor.
| int QwtKnob::borderWidth | ( | ) | const |
Return the border width.
| void QwtKnob::changeEvent | ( | QEvent * | event | ) | [protected, virtual] |
Handle QEvent::StyleChange and QEvent::FontChange;
| event | Change event |
| void QwtKnob::drawKnob | ( | QPainter * | painter, |
| const QRectF & | knobRect | ||
| ) | const [protected, virtual] |
Draw the knob.
| painter | painter |
| knobRect | Bounding rectangle of the knob (without scale) |
| void QwtKnob::drawMarker | ( | QPainter * | painter, |
| const QRectF & | rect, | ||
| double | angle | ||
| ) | const [protected, virtual] |
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 |
| void QwtKnob::getScrollMode | ( | const QPoint & | pos, |
| QwtAbstractSlider::ScrollMode & | scrollMode, | ||
| int & | direction | ||
| ) | const [protected, virtual] |
Set the scrolling mode and direction.
Called by QwtAbstractSlider
| pos | Point in question |
| scrollMode | Scrolling mode |
| direction | Direction |
Implements QwtAbstractSlider.
| double QwtKnob::getValue | ( | const QPoint & | pos | ) | [protected, virtual] |
Determine the value corresponding to a specified position.
Called by QwtAbstractSlider
| pos | point |
Implements QwtAbstractSlider.
| QwtKnob::KnobStyle QwtKnob::knobStyle | ( | ) | const |
| int QwtKnob::knobWidth | ( | ) | const |
Return the width of the knob.
| int QwtKnob::markerSize | ( | ) | const |
Return the marker size.
| QwtKnob::MarkerStyle QwtKnob::markerStyle | ( | ) | const |
| QSize QwtKnob::minimumSizeHint | ( | ) | const [virtual] |
Return a minimum size hint.
| void QwtKnob::paintEvent | ( | QPaintEvent * | event | ) | [protected, virtual] |
Repaint the knob
| event | Paint event |
| void QwtKnob::resizeEvent | ( | QResizeEvent * | event | ) | [protected, virtual] |
Qt Resize Event
| event | Resize event |
| QwtRoundScaleDraw * QwtKnob::scaleDraw | ( | ) |
| const QwtRoundScaleDraw * QwtKnob::scaleDraw | ( | ) | const |
| 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.
| QSize QwtKnob::sizeHint | ( | ) | const [virtual] |
| double QwtKnob::totalAngle | ( | ) | const |
Return the total angle.
1.7.3