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NAME

       QwtCompass -

       A Compass Widget.

SYNOPSIS

       #include <qwt_compass.h>

       Inherits QwtDial.

   Public Types
       enum Direction { Clockwise, CounterClockwise }
       enum Mode { RotateNeedle, RotateScale }
       enum ScaleOptions { ScaleBackbone =  1, ScaleTicks =  2, ScaleLabel =  4 }
       enum ScrollMode { ScrNone, ScrMouse, ScrTimer, ScrDirect, ScrPage }
       enum Shadow { Plain =  QFrame::Plain, Raised =  QFrame::Raised, Sunken =  QFrame::Sunken }

   Public Slots
       virtual void fitValue (double val)
       virtual void incValue (int steps)
       virtual void setReadOnly (bool)
       virtual void setValue (double val)

   Signals
       void sliderMoved (double value)
       void sliderPressed ()
       void sliderReleased ()
       void valueChanged (double value)

   Public Member Functions
       QRect boundingRect () const
       QRect contentsRect () const
       Direction direction () const
       Shadow frameShadow () const
       bool hasVisibleBackground () const
       virtual void incPages (int)
       bool isReadOnly () const
       bool isValid () const
       const QMap< double, QString > & labelMap () const
       QMap< double, QString > & labelMap ()
       int lineWidth () const
       virtual double mass () const
       double maxScaleArc () const
       double maxValue () const
       virtual QSize minimumSizeHint () const
       double minScaleArc () const
       double minValue () const
       Mode mode () const
       const QwtDialNeedle * needle () const
       QwtDialNeedle * needle ()
       Qt::Orientation orientation () const
       double origin () const
       int pageSize () const
       bool periodic () const
       QwtCompass (QWidget *parent=NULL)
       QwtCompassRose * rose ()
       const QwtCompassRose * rose () const
       virtual QRect scaleContentsRect () const
       QwtDialScaleDraw * scaleDraw ()
       const QwtDialScaleDraw * scaleDraw () const
       void setDirection (Direction)
       void setFrameShadow (Shadow)
       void setLabelMap (const QMap< double, QString > &map)
       void setLineWidth (int)
       virtual void setMass (double val)
       void setMode (Mode)
       virtual void setNeedle (QwtDialNeedle *)
       virtual void setOrientation (Qt::Orientation o)
       virtual void setOrigin (double)
       void setPeriodic (bool tf)
       void setRange (double vmin, double vmax, double vstep=0.0, int pagesize=1)
       void setRose (QwtCompassRose *rose)
       virtual void setScale (int maxMajIntv, int maxMinIntv, double step=0.0)
       void setScaleArc (double min, double max)
       virtual void setScaleDraw (QwtDialScaleDraw *)
       void setScaleOptions (int)
       void setScaleTicks (int minLen, int medLen, int majLen, int penWidth=1)
       void setStep (double)
       void setTracking (bool enable)
       void setUpdateTime (int t)
       void setValid (bool valid)
       virtual void setWrapping (bool)
       void showBackground (bool)
       virtual QSize sizeHint () const
       double step () const
       void stopMoving ()
       double value () const
       bool wrapping () const
       virtual ~QwtCompass ()

   Protected Member Functions
       virtual void drawContents (QPainter *) const
       virtual void drawFocusIndicator (QPainter *) const
       virtual void drawFrame (QPainter *p)
       virtual void drawNeedle (QPainter *, const QPoint &, int radius, double direction,
           QPalette::ColorGroup) const
       virtual void drawRose (QPainter *, const QPoint &center, int radius, double north,
           QPalette::ColorGroup) const
       virtual void drawScale (QPainter *, const QPoint &center, int radius, double origin,
           double arcMin, double arcMax) const
       virtual void drawScaleContents (QPainter *, const QPoint &center, int radius) const
       double exactPrevValue () const
       double exactValue () const
       virtual void getScrollMode (const QPoint &, int &scrollMode, int &direction)
       virtual double getValue (const QPoint &)
       virtual void keyPressEvent (QKeyEvent *)
       virtual void mouseMoveEvent (QMouseEvent *e)
       double mouseOffset () const
       virtual void mousePressEvent (QMouseEvent *e)
       virtual void mouseReleaseEvent (QMouseEvent *e)
       virtual void paintEvent (QPaintEvent *)
       double prevValue () const
       virtual void rangeChange ()
       virtual void resizeEvent (QResizeEvent *)
       virtual QwtText scaleLabel (double value) const
       int scrollMode () const
       void setMouseOffset (double)
       virtual void setPosition (const QPoint &)
       virtual void stepChange ()
       virtual void timerEvent (QTimerEvent *e)
       virtual void updateMask ()
       void updateScale ()
       virtual void valueChange ()
       virtual void wheelEvent (QWheelEvent *e)

Detailed Description

       A Compass Widget.

       QwtCompass is a widget to display and enter directions. It consists of a scale, an
       optional needle and rose.

       Note:
           The examples/dials example shows how to use QwtCompass.

Member Enumeration Documentation

   enum QwtDial::Direction [inherited] Direction of the dial
   enum QwtDial::Mode [inherited] In case of RotateNeedle the needle is rotating, in case of
       RotateScale, the needle points to origin() and the scale is rotating.
   enum QwtDial::ScaleOptions [inherited]
       see QwtDial::setScaleOptions

   enum QwtAbstractSlider::ScrollMode [inherited] Scroll mode
       See also:
           getScrollMode()

   enum QwtDial::Shadow [inherited]
       Frame shadow. Unfortunately it is not possible to use QFrame::Shadow as a property of a
       widget that is not derived from QFrame. The following enum is made for the designer only.
       It is safe to use QFrame::Shadow instead.

Constructor & Destructor Documentation

   QwtCompass::QwtCompass (QWidget *parent = NULL) [explicit]
       Constructor. Parameters:
           parent Parent widget

       Create a compass widget with a scale, no needle and no rose. The default origin is 270.0
       with no valid value. It accepts mouse and keyboard inputs and has no step size. The
       default mode is QwtDial::RotateNeedle.

   QwtCompass::~QwtCompass () [virtual]
       Destructor.

Member Function Documentation

   QRect QwtDial::boundingRect () const [inherited] Returns:
           bounding rect of the dial including the frame

       See also:
           setLineWidth(), scaleContentsRect(), contentsRect()

   QRect QwtDial::contentsRect () const [inherited] Returns:
           bounding rect of the circle inside the frame

       See also:
           setLineWidth(), scaleContentsRect(), boundingRect()

   QwtDial::Direction QwtDial::direction () const [inherited] Returns:
           Direction of the dial

       The default direction of a dial is QwtDial::Clockwise

       See also:
           setDirection()

   void QwtDial::drawContents (QPainter *painter) const [protected, virtual, inherited]
       Draw the contents inside the frame. QColorGroup::Background is the background color
       outside of the frame. QColorGroup::Base is the background color inside the frame.
       QColorGroup::Foreground is the background color inside the scale.

       Parameters:
           painter Painter

       See also:
           boundingRect(), contentsRect(), scaleContentsRect(), QWidget::setPalette()

   void QwtDial::drawFocusIndicator (QPainter *painter) const [protected, virtual, inherited]
       Draw a dotted round circle, if !isReadOnly()
       Parameters:
           painter Painter

   void QwtDial::drawFrame (QPainter *painter) [protected, virtual, inherited] Draw the frame
       around the dial
       Parameters:
           painter Painter

       See also:
           lineWidth(), frameShadow()

   void QwtDial::drawNeedle (QPainter *painter, const QPoint &center, intradius, doubledirection,
       QPalette::ColorGroupcg) const [protected, virtual, inherited] Draw the needle
       Parameters:
           painter Painter
           center Center of the dial
           radius Length for the needle
           direction Direction of the needle in degrees, counter clockwise
           cg ColorGroup

       Reimplemented in QwtAnalogClock.

   void QwtCompass::drawRose (QPainter *painter, const QPoint &center, intradius, doublenorth,
       QPalette::ColorGroupcg) const [protected, virtual] Draw the compass rose
       Parameters:
           painter Painter
           center Center of the compass
           radius of the circle, where to paint the rose
           north Direction pointing north, in degrees counter clockwise
           cg Color group

   void QwtDial::drawScale (QPainter *painter, const QPoint &center, intradius, doubleorigin,
       doubleminArc, doublemaxArc) const [protected, virtual, inherited] Draw the scale
       Parameters:
           painter Painter
           center Center of the dial
           radius Radius of the scale
           origin Origin of the scale
           minArc Minimum of the arc
           maxArc Minimum of the arc

       See also:
           QwtAbstractScaleDraw::setAngleRange()

   void QwtCompass::drawScaleContents (QPainter *painter, const QPoint &center, intradius) const
       [protected, virtual] Draw the contents of the scale
       Parameters:
           painter Painter
           center Center of the content circle
           radius Radius of the content circle

       Reimplemented from QwtDial.

   double QwtDoubleRange::exactPrevValue () const [protected, inherited]
       Returns the exact previous value.

   double QwtDoubleRange::exactValue () const [protected, inherited]
       Returns the exact value. The exact value is the value which QwtDoubleRange::value would
       return if the value were not adjusted to the step raster. It differs from the current
       value only if QwtDoubleRange::fitValue or QwtDoubleRange::incValue have been used before.
       This function is intended for internal use in derived classes.

   void QwtAbstractSlider::fitValue (doublevalue) [virtual, slot, inherited]
       Set the slider's value to the nearest integer multiple of the step size. Parameters:
           value Value

       See also:
           setValue(), incValue()

       Reimplemented from QwtDoubleRange.

   QwtDial::Shadow QwtDial::frameShadow () const [inherited] Returns:
           Frame shadow /sa setFrameShadow(), lineWidth(), QFrame::frameShadow

   void QwtDial::getScrollMode (const QPoint &pos, int &scrollMode, int &direction) [protected,
       virtual, inherited] See QwtAbstractSlider::getScrollMode()
       Parameters:
           pos point where the mouse was pressed

       Return values:
           scrollMode The scrolling mode
           direction direction: 1, 0, or -1.

       See also:
           QwtAbstractSlider::getScrollMode()

       Implements QwtAbstractSlider.

   double QwtDial::getValue (const QPoint &pos) [protected, virtual, inherited] Find the value
       for a given position
       Parameters:
           pos Position

       Returns:
           Value

       Implements QwtAbstractSlider.

   bool QwtDial::hasVisibleBackground () const [inherited] true when the area outside of the
       frame is visible
       See also:
           showBackground(), setMask()

   void QwtDoubleRange::incPages (intnPages) [virtual, inherited]
       Increment the value by a specified number of pages. Parameters:
           nPages Number of pages to increment. A negative number decrements the value.

       Warning:
           The Page size is specified in the constructor.

   void QwtAbstractSlider::incValue (intsteps) [virtual, slot, inherited]
       Increment the value by a specified number of steps. Parameters:
           steps number of steps

       See also:
           setValue()

       Reimplemented from QwtDoubleRange.

   bool QwtAbstractSlider::isReadOnly () const [inherited] In read only mode the slider can't be
       controlled by mouse or keyboard.
       Returns:
           true if read only

       See also:
           setReadOnly()

   bool QwtAbstractSlider::isValid () const [inline, inherited] See also:
           QwtDblRange::isValid()

       Reimplemented from QwtDoubleRange.

   void QwtCompass::keyPressEvent (QKeyEvent *kev) [protected, virtual] Handles key events
       Beside the keys described in QwtDial::keyPressEvent numbers from 1-9 (without 5) set the
       direction according to their position on the num pad.

       See also:
           isReadOnly()

       Reimplemented from QwtDial.

   const QMap< double, QString > & QwtCompass::labelMap () const Returns:
           map, mapping values to labels

       See also:
           setLabelMap()

   QMap< double, QString > & QwtCompass::labelMap () Returns:
           map, mapping values to labels

       See also:
           setLabelMap()

   int QwtDial::lineWidth () const [inherited] Returns:
           Line width of the frame

       See also:
           setLineWidth(), frameShadow(), lineWidth()

   double QwtAbstractSlider::mass () const [virtual, inherited] Returns:
           mass

       See also:
           setMass()

       Reimplemented in QwtWheel.

   double QwtDial::maxScaleArc () const [inherited] Returns:
           Upper limit of the scale arc

   double QwtDoubleRange::maxValue () const [inherited]
       Returns the value of the second border of the range. maxValue returns the value which has
       been specified as the second parameter in QwtDoubleRange::setRange.

       See also:
           setRange()

   QSize QwtDial::minimumSizeHint () const [virtual, inherited]
       Return a minimum size hint. Warning:
           The return value of QwtDial::minimumSizeHint() depends on the font and the scale.

   double QwtDial::minScaleArc () const [inherited] Returns:
           Lower limit of the scale arc

   double QwtDoubleRange::minValue () const [inherited]
       Returns the value at the first border of the range. minValue returns the value which has
       been specified as the first parameter in setRange().

       See also:
           setRange()

   QwtDial::Mode QwtDial::mode () const [inherited] Returns:
           mode of the dial.

       The value of the dial is indicated by the difference between the origin and the direction
       of the needle. In case of QwtDial::RotateNeedle the scale arc is fixed to the origin() and
       the needle is rotating, in case of QwtDial::RotateScale, the needle points to origin() and
       the scale is rotating.

       The default mode is QwtDial::RotateNeedle.

       See also:
           setMode(), origin(), setScaleArc(), value()

   void QwtAbstractSlider::mouseMoveEvent (QMouseEvent *e) [protected, virtual, inherited] Mouse
       Move Event handler
       Parameters:
           e Mouse event

   void QwtAbstractSlider::mousePressEvent (QMouseEvent *e) [protected, virtual, inherited] Mouse
       press event handler
       Parameters:
           e Mouse event

   void QwtAbstractSlider::mouseReleaseEvent (QMouseEvent *e) [protected, virtual, inherited]
       Mouse Release Event handler
       Parameters:
           e Mouse event

   QwtDialNeedle * QwtDial::needle () [inherited] Returns:
           needle

       See also:
           setNeedle()

   const QwtDialNeedle * QwtDial::needle () const [inherited] Returns:
           needle

       See also:
           setNeedle()

   Qt::Orientation QwtAbstractSlider::orientation () const [inherited] Returns:
           Orientation

       See also:
           setOrientation()

   double QwtDial::origin () const [inherited] The origin is the angle where scale and needle is
       relative to.
       Returns:
           Origin of the dial

       See also:
           setOrigin()

   int QwtDoubleRange::pageSize () const [inherited]
       Returns the page size in steps.

   void QwtDial::paintEvent (QPaintEvent *e) [protected, virtual, inherited] Paint the dial
       Parameters:
           e Paint event

   bool QwtDoubleRange::periodic () const [inherited]
       Returns true if the range is periodic. See also:
           setPeriodic()

   double QwtDoubleRange::prevValue () const [protected, inherited]
       Returns the previous value.

   void QwtDial::rangeChange () [protected, virtual, inherited]
       QwtDoubleRange update hook.

       Reimplemented from QwtDoubleRange.

   void QwtDial::resizeEvent (QResizeEvent *e) [protected, virtual, inherited] Resize the dial
       widget
       Parameters:
           e Resize event

   const QwtCompassRose * QwtCompass::rose () const Returns:
           rose

       See also:
           setRose()

   QwtCompassRose * QwtCompass::rose () Returns:
           rose

       See also:
           setRose()

   QRect QwtDial::scaleContentsRect () const [virtual, inherited] Returns:
           rect inside the scale

       See also:
           setLineWidth(), boundingRect(), contentsRect()

   QwtDialScaleDraw * QwtDial::scaleDraw () [inherited]
       Return the scale draw.

   const QwtDialScaleDraw * QwtDial::scaleDraw () const [inherited]
       Return the scale draw.

   QwtText QwtCompass::scaleLabel (doublevalue) const [protected, virtual] Map a value to a
       corresponding label
       Parameters:
           value Value that will be mapped

       Returns:
           Label, or QString::null

       label() looks in a map for a corresponding label for value or return an null text.

       See also:
           labelMap(), setLabelMap()

       Reimplemented from QwtDial.

   void QwtDial::setDirection (Directiondirection) [inherited] Set the direction of the dial
       (clockwise/counterclockwise)
       Direction direction

       See also:
           direction()

   void QwtDial::setFrameShadow (Shadowshadow) [inherited] Sets the frame shadow value from the
       frame style.
       Parameters:
           shadow Frame shadow

       See also:
           setLineWidth(), QFrame::setFrameShadow()

   void QwtCompass::setLabelMap (const QMap< double, QString > &map)
       Set a map, mapping values to labels. Parameters:
           map value to label map

       The values of the major ticks are found by looking into this map. The default map consists
       of the labels N, NE, E, SE, S, SW, W, NW.

       Warning:
           The map will have no effect for values that are no major tick values. Major ticks can
           be changed by QwtScaleDraw::setScale

       See also:
           labelMap(), scaleDraw(), setScale()

   void QwtDial::setLineWidth (intlineWidth) [inherited] Sets the line width
       Parameters:
           lineWidth Line width

       See also:
           setFrameShadow()

   void QwtAbstractSlider::setMass (doubleval) [virtual, inherited]
       Set the slider's mass for flywheel effect. If the slider's mass is greater then 0, it will
       continue to move after the mouse button has been released. Its speed decreases with time
       at a rate depending on the slider's mass. A large mass means that it will continue to move
       for a long time.

       Derived widgets may overload this function to make it public.

       Parameters:
           val New mass in kg

       See also:
           mass()

       Reimplemented in QwtWheel.

   void QwtDial::setMode (Modemode) [inherited]
       Change the mode of the meter. Parameters:
           mode New mode

       The value of the meter is indicated by the difference between north of the scale and the
       direction of the needle. In case of QwtDial::RotateNeedle north is pointing to the
       origin() and the needle is rotating, in case of QwtDial::RotateScale, the needle points to
       origin() and the scale is rotating.

       The default mode is QwtDial::RotateNeedle.

       See also:
           mode(), setValue(), setOrigin()

   void QwtDial::setNeedle (QwtDialNeedle *needle) [virtual, inherited] Set a needle for the dial
       Qwt is missing a set of good looking needles. Contributions are very welcome.

       Parameters:
           needle Needle

       Warning:
           The needle will be deleted, when a different needle is set or in ~QwtDial()

   void QwtAbstractSlider::setOrientation (Qt::Orientationo) [virtual, inherited]
       Set the orientation. Parameters:
           o Orientation. Allowed values are Qt::Horizontal and Qt::Vertical.

       Reimplemented in QwtSlider, and QwtWheel.

   void QwtDial::setOrigin (doubleorigin) [virtual, inherited]
       Change the origin. The origin is the angle where scale and needle is relative to.

       Parameters:
           origin New origin

       See also:
           origin()

   void QwtDoubleRange::setPeriodic (booltf) [inherited]
       Make the range periodic. When the range is periodic, the value will be set to a point
       inside the interval such that

       point = value + n * width .fi

       if the user tries to set a new value which is outside the range. If the range is nonperiodic (the default), values outside the range will be clipped.

       Parameters:
           tf true for a periodic range

   void QwtAbstractSlider::setPosition (const QPoint &p) [protected, virtual, inherited] Move the
       slider to a specified point, adjust the value and emit signals if necessary.
   void QwtDoubleRange::setRange (doublevmin, doublevmax, doublevstep = 0.0, intpageSize = 1)
       [inherited]
       Specify range and step size. Parameters:
           vmin lower boundary of the interval
           vmax higher boundary of the interval
           vstep step width
           pageSize page size in steps

       Warning:
           · A change of the range changes the value if it lies outside the new range. The
             current value will *not* be adjusted to the new step raster.
           · vmax < vmin is allowed.
           · If the step size is left out or set to zero, it will be set to 1/100 of the interval
             length.
           · If the step size has an absurd value, it will be corrected to a better one.
   void QwtAbstractSlider::setReadOnly (boolreadOnly) [virtual, slot, inherited] En/Disable read
       only mode
       In read only mode the slider can't be controlled by mouse or keyboard.
       Parameters:
           readOnly Enables in case of true
       See also:
           isReadOnly()
   void QwtCompass::setRose (QwtCompassRose *rose) Set a rose for the compass
       Parameters:
           rose Compass rose
       Warning:
           The rose will be deleted, when a different rose is set or in ~QwtCompass
       See also:
           rose()
   void QwtDial::setScale (intmaxMajIntv, intmaxMinIntv, doublestep = 0.0) [virtual, inherited]
       Change the intervals of the scale
       See also:
           QwtAbstractScaleDraw::setScale()
   void QwtDial::setScaleArc (doubleminArc, doublemaxArc) [inherited] Change the arc of the scale
       Parameters:
           minArc Lower limit
           maxArc Upper limit
   void QwtDial::setScaleDraw (QwtDialScaleDraw *scaleDraw) [virtual, inherited] Set an
       individual scale draw
       Parameters:
           scaleDraw Scale draw
       Warning:
           The previous scale draw is deleted
   void QwtDial::setScaleOptions (intoptions) [inherited] A wrapper method for accessing the
       scale draw.
       · options == 0
          No visible scale: setScaleDraw(NULL)
       · options & ScaleBackbone
          En/disable the backbone of the scale.
       · options & ScaleTicks
          En/disable the ticks of the scale.
       · options & ScaleLabel
          En/disable scale labels
       See also:
           QwtAbstractScaleDraw::enableComponent()
   void QwtDial::setScaleTicks (intminLen, intmedLen, intmajLen, intpenWidth = 1) [inherited]
       Assign length and width of the ticks
       Parameters:
           minLen Length of the minor ticks
           medLen Length of the medium ticks
           majLen Length of the major ticks
           penWidth Width of the pen for all ticks
       See also:
           QwtAbstractScaleDraw::setTickLength(), QwtDialScaleDraw::setPenWidth()
   void QwtDoubleRange::setStep (doublevstep) [inherited]
       Change the step raster. Parameters:
           vstep new step width
       Warning:
           The value will not be adjusted to the new step raster.
       Reimplemented in QwtCounter.
   void QwtAbstractSlider::setTracking (boolenable) [inherited]
       Enables or disables tracking. If tracking is enabled, the slider emits a valueChanged()
       signal whenever its value changes (the default behaviour). If tracking is disabled, the
       value changed() signal will only be emitted if:

       · the user releases the mouse button and the value has changed or
       · at the end of automatic scrolling.
       Tracking is enabled by default.
       Parameters:
           enable true (enable) or false (disable) tracking.
   void QwtAbstractSlider::setUpdateTime (intt) [inherited]
       Specify the update interval for automatic scrolling. Parameters:
           t update interval in milliseconds
       See also:
           getScrollMode()
   void QwtAbstractSlider::setValid (boolvalid) [inline, inherited] Parameters:
           valid true/false
       See also:
           QwtDblRange::isValid()
       Reimplemented from QwtDoubleRange.
   void QwtAbstractSlider::setValue (doubleval) [virtual, slot, inherited]
       Move the slider to a specified value. This function can be used to move the slider to a
       value which is not an integer multiple of the step size.
       Parameters:
           val new value
       See also:
           fitValue()
       Reimplemented from QwtDoubleRange.
   void QwtDial::setWrapping (boolwrapping) [virtual, inherited] Sets whether it is possible to
       step the value from the highest value to the lowest value and vice versa to on.
       Parameters:
           wrapping en/disables wrapping
       See also:
           wrapping(), QwtDoubleRange::periodic()
       Note:
           The meaning of wrapping is like the wrapping property of QSpinBox, but not like it is
           used in QDial.
   void QwtDial::showBackground (boolshow) [inherited] Show/Hide the area outside of the frame
       Parameters:
           show Show if true, hide if false
       See also:
           hasVisibleBackground(), setMask()
       Warning:
           When QwtDial is a toplevel widget the window border might disappear too.
   QSize QwtDial::sizeHint () const [virtual, inherited] Returns:
           Size hint
   void QwtAbstractSlider::sliderMoved (doublevalue) [signal, inherited] This signal is emitted
       when the user moves the slider with the mouse.
       Parameters:
           value new value
   void QwtAbstractSlider::sliderPressed () [signal, inherited] This signal is emitted when the
       user presses the movable part of the slider (start ScrMouse Mode).
   void QwtAbstractSlider::sliderReleased () [signal, inherited] This signal is emitted when the
       user releases the movable part of the slider.
   double QwtDoubleRange::step () const [inherited] Returns:
           the step size
       See also:
           setStep(), setRange()
       Reimplemented in QwtCounter.
   void QwtDoubleRange::stepChange () [protected, virtual, inherited]
       Notify a change of the step size. This virtual function is called whenever the step size
       changes. The default implementation does nothing.
   void QwtAbstractSlider::stopMoving () [inherited]
       Stop updating if automatic scrolling is active.
   void QwtAbstractSlider::timerEvent (QTimerEvent *e) [protected, virtual, inherited] Qt timer
       event
       Parameters:
           e Timer event
   void QwtDial::updateMask () [protected, virtual, inherited]
       Update the mask of the dial. In case of 'hasVisibleBackground() == false', the backgound
       is transparent by a mask.
       See also:
           showBackground(), hasVisibleBackground()
   void QwtDial::updateScale () [protected, inherited] Update the scale with the current
       attributes
       See also:
           setScale()
   double QwtDoubleRange::value () const [inherited]
       Returns the current value.
       Reimplemented in QwtCounter.
   void QwtDial::valueChange () [protected, virtual, inherited]
       QwtDoubleRange update hook.
       Reimplemented from QwtAbstractSlider.
   void QwtAbstractSlider::valueChanged (doublevalue) [signal, inherited]
       Notify a change of value. In the default setting (tracking enabled), this signal will be
       emitted every time the value changes ( see setTracking() ).
       Parameters:
           value new value
   void QwtAbstractSlider::wheelEvent (QWheelEvent *e) [protected, virtual, inherited] Wheel
       Event handler
       Parameters:
           e Whell event
   bool QwtDial::wrapping () const [inherited] wrapping() holds whether it is possible to step
       the value from the highest value to the lowest value and vice versa.
       See also:
           setWrapping(), QwtDoubleRange::setPeriodic()
       Note:
           The meaning of wrapping is like the wrapping property of QSpinBox, but not like it is
           used in QDial.

Author

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