QwtDial - Man Page

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 }

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

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

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
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
QwtDial (QWidget *parent=NULL)
virtual QRect scaleContentsRect () const
QwtDialScaleDraw * scaleDraw ()
const QwtDialScaleDraw * scaleDraw () 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)
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 ~QwtDial ()

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

class QwtDialScaleDraw

see QwtDial::setScaleOptions

See also:

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. Parameters:

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.

Destructor.

See also:

See also:

The default direction of a dial is QwtDial::Clockwise

See also:

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()

Parameters:

painter Painter

Parameters:

painter Painter

See also:

lineWidth(), frameShadow()

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.

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()

Paints nothing.

Parameters:

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

Reimplemented in QwtCompass.

Returns the exact previous value.

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.

Set the slider's value to the nearest integer multiple of the step size. Parameters:

See also:

Reimplemented from QwtDoubleRange.

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.

Parameters:

pos Position

Returns:

Value

Implements QwtAbstractSlider.

See also:

Increment the value by a specified number of pages. Parameters:

Warning:

The Page size is specified in the constructor.

Increment the value by a specified number of steps. Parameters:

See also:

Reimplemented from QwtDoubleRange.

Returns:

true if read only

See also:

setReadOnly()

Reimplemented from QwtDoubleRange.

• Key_Down, KeyLeft
  Decrement by 1
• Key_Prior
  Decrement by pageSize()
• Key_Home
  Set the value to minValue()
• Key_Up, KeyRight
  Increment by 1
• Key_Next
  Increment by pageSize()
• Key_End
  Set the value to maxValue()

Parameters:

event Key event

See also:

isReadOnly()

Reimplemented from QwtAbstractSlider.

Reimplemented in QwtCompass.

See also:

See also:

Reimplemented in QwtWheel.

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:

Return a minimum size hint. Warning:

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:

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:

Parameters:

e Mouse event

Parameters:

e Mouse event

Parameters:

e Mouse event

See also:

See also:

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Returns:

Origin of the dial

See also:

setOrigin()

Returns the page size in steps.

Parameters:

e Paint event

Returns true if the range is periodic. See also:

Returns the previous value.

QwtDoubleRange update hook.

Reimplemented from QwtDoubleRange.

Parameters:

e Resize event

See also:

Return the scale draw.

Return the scale draw.

Parameters:

value Value

Returns:

label

Reimplemented in QwtAnalogClock, and QwtCompass.

Direction direction

See also:

Parameters:

shadow Frame shadow

See also:

setLineWidth(), QFrame::setFrameShadow()

Parameters:

lineWidth Line width

See also:

setFrameShadow()

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.

Change the mode of the meter. Parameters:

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:

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()

Set the orientation. Parameters:

Reimplemented in QwtSlider, and QwtWheel.

Change the origin. The origin is the angle where scale and needle is relative to.

Parameters:

origin New origin

See also:

origin()

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

Specify range and step size. Parameters:

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.

In read only mode the slider can't be controlled by mouse or keyboard.

Parameters:

readOnly Enables in case of true

See also:

isReadOnly()

See also:

Parameters:

minArc Lower limit
maxArc Upper limit

Parameters:

scaleDraw Scale draw

Warning:

The previous scale draw is deleted

• 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:

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()

Change the step raster. Parameters:

Warning:

The value will not be adjusted to the new step raster.

Reimplemented in QwtCounter.

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.

Specify the update interval for automatic scrolling. Parameters:

See also:

See also:

Reimplemented from QwtDoubleRange.

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.

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.

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.

Parameters:

value new value

See also:

Reimplemented in QwtCounter.

Notify a change of the step size. This virtual function is called whenever the step size changes. The default implementation does nothing.

Stop updating if automatic scrolling is active.

Parameters:

e Timer event

Update the mask of the dial. In case of 'hasVisibleBackground() == false', the backgound is transparent by a mask.

See also:

See also:

Returns the current value.

Reimplemented in QwtCounter.

QwtDoubleRange update hook.

Reimplemented from QwtAbstractSlider.

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

Parameters:

e Whell event

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.