# QwtCompass Class Reference

A Compass Widget. More...

`#include <qwt_compass.h>`

Inheritance diagram for QwtCompass:
[legend]

List of all members.

## Public Types

enum | Direction { Clockwise, CounterClockwise }
enum | Mode { RotateNeedle, RotateScale }
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

QRectF | boundingRect () const
Direction | direction () const
Shadow | frameShadow () const
virtual void | incPages (int)
QRectF | innerRect () const
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)
const QwtCompassRose * | rose () const
QwtCompassRose * | rose ()
QwtDialScaleDraw * | scaleDraw ()
const QwtDialScaleDraw * | scaleDraw () const
virtual QRectF | scaleInnerRect () 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)
void | setScaleComponents (QwtAbstractScaleDraw::ScaleComponents)
virtual void | setScaleDraw (QwtDialScaleDraw *)
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)
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 QPointF &, double radius, double direction, QPalette::ColorGroup) const
virtual void | drawRose (QPainter *, const QPointF &center, double radius, double north, QPalette::ColorGroup) const
virtual void | drawScale (QPainter *, const QPointF &center, double radius, double origin, double arcMin, double arcMax) const
virtual void | drawScaleContents (QPainter *, const QPointF &center, double radius) const
double | exactPrevValue () const
double | exactValue () const
virtual void | getScrollMode (const QPoint &, QwtAbstractSlider::ScrollMode &, int &direction) const
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 QwtText | scaleLabel (double value) const
int | scrollMode () const
void | setMouseOffset (double)
virtual void | setPosition (const QPoint &)
virtual void | stepChange ()
virtual void | timerEvent (QTimerEvent *e)
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.

Enumerator:

  Clockwise | Clockwise.
  CounterClockwise | Counter clockwise.

enum QwtDial::Mode`[inherited]`

Mode controlling wether the needle or the scale is rotating.

Enumerator:

  RotateNeedle | The needle is rotating.
  RotateScale | The needle is fixed, the scales are rotating.

enum QwtAbstractSlider::ScrollMode`[inherited]`

Scroll mode

See also:
  getScrollMode()

Enumerator:

  ScrNone | Scrolling switched off. Don't change the value.
  ScrMouse | Change the value while the user keeps the button pressed and moves the mouse.
  ScrTimer | Automatic scrolling. Increment the value in the specified direction as long as the user keeps the button pressed.
  ScrPage | Automatic scrolling. Same as ScrTimer, but increment by page size.

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.

Enumerator:

  Plain | QFrame::Plain.
  Raised | QFrame::Raised.
  Sunken | QFrame::Sunken.

## 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

QRectF QwtDial::boundingRect | ( |  | ) | const`[inherited]`

Returns:
  bounding rect of the dial including the frame

See also:
  setLineWidth(), scaleInnerRect(), innerRect()

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.

QPalette::Window is the background color outside of the frame. QPalette::Base is the background color inside the frame. QPalette::WindowText is the background color inside the scale.

Parameters:

  painter | Painter

See also:
  boundingRect(), innerRect(), scaleInnerRect(), 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 QPointF & | center,
|  | double | radius,
|  | double | direction,
|  | QPalette::ColorGroup | cg
| ) |  | 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 QPointF & | center,
|  | double | radius,
|  | double | north,
|  | QPalette::ColorGroup | cg
| ) |  | 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 QPointF & | center,
|  | double | radius,
|  | double | origin,
|  | double | minArc,
|  | double | maxArc
| ) |  | 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:
  QwtRoundScaleDraw::setAngleRange()

void QwtCompass::drawScaleContents | ( | QPainter * | painter,
|  | const QPointF & | center,
|  | double | radius
| ) |  | 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 fitValue() or incValue() have been used before. This function is intended for internal use in derived classes.

void QwtAbstractSlider::fitValue | ( | double | value | ) | `[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,
|  | QwtAbstractSlider::ScrollMode & | scrollMode,
|  | int & | direction
| ) |  | const`[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.

void QwtDoubleRange::incPages | ( | int | nPages | ) | `[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 | ( | int | steps | ) | `[virtual, slot, inherited]`

Increment the value by a specified number of steps.

Parameters:

  steps | number of steps

See also:
  setValue()

Reimplemented from QwtDoubleRange.

QRectF QwtDial::innerRect | ( |  | ) | const`[inherited]`

Returns:
  bounding rect of the circle inside the frame

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

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()

Reimplemented in QwtCounter.

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()

Reimplemented in QwtCounter.

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

double QwtAbstractSlider::mouseOffset | ( |  | ) | const`[protected, inherited]`

See also:
  setMouseOffset()

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 * | event | ) | `[protected, virtual, inherited]`

Paint the dial

Parameters:

  event | 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.

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

Returns:
  rose

See also:
  setRose()

QwtCompassRose * QwtCompass::rose | ( |  | ) |

Returns:
  rose

See also:
  setRose()

QwtDialScaleDraw * QwtDial::scaleDraw | ( |  | ) | `[inherited]`

Return the scale draw.

const QwtDialScaleDraw * QwtDial::scaleDraw | ( |  | ) | const`[inherited]`

Return the scale draw.

QRectF QwtDial::scaleInnerRect | ( |  | ) | const`[virtual, inherited]`

Returns:
  rect inside the scale

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

QwtText QwtCompass::scaleLabel | ( | double | value | ) | 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.

int QwtAbstractSlider::scrollMode | ( |  | ) | const`[protected, inherited]`

sa ScrollMode

void QwtDial::setDirection | ( | Direction | direction | ) | `[inherited]`

Set the direction of the dial (clockwise/counterclockwise)

Parameters:

  direction | Direction

See also:
  direction()

void QwtDial::setFrameShadow | ( | Shadow | shadow | ) | `[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 | ( | int | lineWidth | ) | `[inherited]`

Sets the line width

Parameters:

  lineWidth | Line width

See also:
  setFrameShadow()

void QwtAbstractSlider::setMass | ( | double | val | ) | `[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 | ( | Mode | mode | ) | `[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 QwtAbstractSlider::setMouseOffset | ( | double | offset | ) | `[protected, inherited]`

See also:
  mouseOffset()

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::Orientation | o | ) | `[virtual, inherited]`

Set the orientation.

Parameters:

  o | Orientation. Allowed values are Qt::Horizontal and Qt::Vertical.

Reimplemented in QwtSlider, and QwtWheel.

void QwtDial::setOrigin | ( | double | origin | ) | `[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 | ( | bool | tf | ) | `[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

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 | ( | double | vmin,
|  | double | vmax,
|  | double | vstep = `0.0`,
|  | int | pageSize = `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 | ( | bool | readOnly | ) | `[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 | ( | int | maxMajIntv,
|  | int | maxMinIntv,
|  | double | step = `0.0`
| ) |  | `[virtual, inherited]`

Change the intervals of the scale

Parameters:

  maxMajIntv | Maximum for the number of major steps
  maxMinIntv | Maximum number of minor steps
  step | Step size

See also:
  QwtScaleEngine::divideScale()

void QwtDial::setScaleArc | ( | double | minArc,
|  | double | maxArc
| ) |  | `[inherited]`

Change the arc of the scale

Parameters:

  minArc | Lower limit
  maxArc | Upper limit

void QwtDial::setScaleComponents | ( | QwtAbstractScaleDraw::ScaleComponents | components | ) | `[inherited]`

A wrapper method for accessing the scale draw.

Parameters:

  components | Scale components

See also:
  QwtAbstractScaleDraw::enableComponent()

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::setScaleTicks | ( | int | minLen,
|  | int | medLen,
|  | int | majLen,
|  | int | penWidth = `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 | ( | double | vstep | ) | `[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 | ( | bool | enable | ) | `[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 | ( | int | t | ) | `[inherited]`

Specify the update interval for automatic scrolling.

Parameters:

  t | update interval in milliseconds

See also:
  getScrollMode()

void QwtAbstractSlider::setValid | ( | bool | valid | ) | `[inline, inherited]`

Parameters:

  valid | true/false

See also:
  QwtDblRange::isValid()

Reimplemented from QwtDoubleRange.

void QwtAbstractSlider::setValue | ( | double | val | ) | `[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 | ( | bool | wrapping | ) | `[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.

QSize QwtDial::sizeHint | ( |  | ) | const`[virtual, inherited]`

Returns:
  Size hint

void QwtAbstractSlider::sliderMoved | ( | double | value | ) | `[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::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 | ( | double | value | ) | `[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.