QwtDial Class Reference

QwtDial class provides a rounded range control. More...

#include <qwt_dial.h>

Inheritance diagram for QwtDial:

Inheritance graph
[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
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
QwtDialNeedleneedle ()
const QwtDialNeedleneedle () const
Qt::Orientation orientation () const
double origin () const
int pageSize () const
bool periodic () const
 QwtDial (QWidget *parent=NULL)
const QwtDialScaleDrawscaleDraw () const
QwtDialScaleDrawscaleDraw ()
virtual QRectF scaleInnerRect () const
void setDirection (Direction)
void setFrameShadow (Shadow)
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)
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 ~QwtDial ()

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 drawScale (QPainter *, const QPointF &center, double radius, double origin, double arcMin, double arcMax) const
virtual void drawScaleContents (QPainter *painter, 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) 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)

Friends

class QwtDialScaleDraw


Detailed Description

QwtDial class provides a rounded range control.

QwtDial is intended as base class for dial widgets like speedometers, compass widgets, clocks ...

dials2.png

A dial contains a scale and a needle indicating the current value of the dial. Depending on Mode one of them is fixed and the other is rotating. If not isReadOnly() the dial can be rotated by dragging the mouse or using keyboard inputs (see keyPressEvent()). A dial might be wrapping, what means a rotation below/above one limit continues on the other limit (f.e compass). The scale might cover any arc of the dial, its values are related to the origin() of the dial.

Qwt is missing a set of good looking needles (QwtDialNeedle). Contributions are very welcome.

See also:
QwtCompass, QwtAnalogClock, QwtDialNeedle
Note:
The examples/dials example shows different types of dials.

Member Enumeration Documentation

Direction of the dial.

Enumerator:
Clockwise  Clockwise.
CounterClockwise  Counter clockwise.

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.

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.

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

QwtDial::QwtDial ( QWidget *  parent = NULL  )  [explicit]

Constructor.

Parameters:
parent Parent widget
Create a dial widget with no scale and no needle. The default origin is 90.0 with no valid value. It accepts mouse and keyboard inputs and has no step size. The default mode is QwtDial::RotateNeedle.

QwtDial::~QwtDial (  )  [virtual]

Destructor.


Member Function Documentation

QRectF QwtDial::boundingRect (  )  const

Returns:
bounding rect of the dial including the frame
See also:
setLineWidth(), scaleInnerRect(), innerRect()

QwtDial::Direction QwtDial::direction (  )  const

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]

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]

Draw a dotted round circle, if !isReadOnly()

Parameters:
painter Painter

void QwtDial::drawFrame ( QPainter *  painter  )  [protected, virtual]

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]

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 QwtDial::drawScale ( QPainter *  painter,
const QPointF &  center,
double  radius,
double  origin,
double  minArc,
double  maxArc 
) const [protected, virtual]

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 QwtDial::drawScaleContents ( QPainter *  painter,
const QPointF &  center,
double  radius 
) const [protected, virtual]

Draw the contents inside the scale

Paints nothing.

Parameters:
painter Painter
center Center of the contents circle
radius Radius of the contents circle

Reimplemented in QwtCompass.

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

Returns:
Frame shadow /sa setFrameShadow(), lineWidth(), QFrame::frameShadow

void QwtDial::getScrollMode ( const QPoint &  pos,
QwtAbstractSlider::ScrollMode scrollMode,
int &  direction 
) const [protected, virtual]

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]

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

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 QwtDial::keyPressEvent ( QKeyEvent *  event  )  [protected, virtual]

Handles key events

  • Key_Down, KeyLeft
    Decrement by 1
  • Key_Prior
    Decrement by pageSize()
  • Key_Home
    Set the value to minValue()

Parameters:
event Key event
See also:
isReadOnly()

Reimplemented from QwtAbstractSlider.

Reimplemented in QwtCompass.

int QwtDial::lineWidth (  )  const

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

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]

Return a minimum size hint.

Warning:
The return value of QwtDial::minimumSizeHint() depends on the font and the scale.

double QwtDial::minScaleArc (  )  const

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

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 (  ) 

Returns:
needle
See also:
setNeedle()

const QwtDialNeedle * QwtDial::needle (  )  const

Returns:
needle
See also:
setNeedle()

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

Returns:
Orientation
See also:
setOrientation()

double QwtDial::origin (  )  const

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]

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]

QwtDoubleRange update hook.

Reimplemented from QwtDoubleRange.

const QwtDialScaleDraw * QwtDial::scaleDraw (  )  const

Return the scale draw.

QwtDialScaleDraw * QwtDial::scaleDraw (  ) 

Return the scale draw.

QRectF QwtDial::scaleInnerRect (  )  const [virtual]

Returns:
rect inside the scale
See also:
setLineWidth(), boundingRect(), innerRect()

QwtText QwtDial::scaleLabel ( double  value  )  const [protected, virtual]

Find the label for a value

Parameters:
value Value
Returns:
label

Reimplemented in QwtAnalogClock, and QwtCompass.

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

sa ScrollMode

void QwtDial::setDirection ( Direction  direction  ) 

Set the direction of the dial (clockwise/counterclockwise)

Parameters:
direction Direction
See also:
direction()

void QwtDial::setFrameShadow ( Shadow  shadow  ) 

Sets the frame shadow value from the frame style.

Parameters:
shadow Frame shadow
See also:
setLineWidth(), QFrame::setFrameShadow()

void QwtDial::setLineWidth ( int  lineWidth  ) 

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  ) 

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]

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]

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 QwtDial::setScale ( int  maxMajIntv,
int  maxMinIntv,
double  step = 0.0 
) [virtual]

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 
)

Change the arc of the scale

Parameters:
minArc Lower limit
maxArc Upper limit

void QwtDial::setScaleComponents ( QwtAbstractScaleDraw::ScaleComponents  components  ) 

A wrapper method for accessing the scale draw.

Parameters:
components Scale components
See also:
QwtAbstractScaleDraw::enableComponent()

void QwtDial::setScaleDraw ( QwtDialScaleDraw scaleDraw  )  [virtual]

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 
)

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]

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]

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]

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]

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

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.


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