Provided by: libqwt5-doc_5.2.3-1_all 
NAME
QwtDial -
SYNOPSIS
#include <qwt_dial.h>
Inherits QwtAbstractSlider.
Inherited by QwtAnalogClock, and QwtCompass.
Public Types
enum Direction { Clockwise, CounterClockwise }
enum Mode { RotateNeedle, RotateScale }
enum ScaleOptions { ScaleBackbone = 1, ScaleTicks = 2, ScaleLabel = 4 }
enum Shadow { Plain = QFrame::Plain, Raised = QFrame::Raised, Sunken = QFrame::Sunken }
Public Member Functions
QwtDial (QWidget *parent=NULL)
virtual ~QwtDial ()
QRect boundingRect () const
QRect contentsRect () const
Direction direction () const
Shadow frameShadow () const
bool hasVisibleBackground () const
int lineWidth () const
double maxScaleArc () const
virtual QSize minimumSizeHint () const
double minScaleArc () const
Mode mode () const
const QwtDialNeedle * needle () const
QwtDialNeedle * needle ()
double origin () const
virtual QRect scaleContentsRect () const
QwtDialScaleDraw * scaleDraw ()
const QwtDialScaleDraw * scaleDraw () const
void setDirection (Direction)
void setFrameShadow (Shadow)
void setLineWidth (int)
void setMode (Mode)
virtual void setNeedle (QwtDialNeedle *)
virtual void setOrigin (double)
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)
virtual void setWrapping (bool)
void showBackground (bool)
virtual QSize sizeHint () const
bool wrapping () const
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 drawScale (QPainter *, const QPoint ¢er, int radius, double origin,
double arcMin, double arcMax) const
virtual void drawScaleContents (QPainter *painter, const QPoint ¢er, int radius) const
virtual void getScrollMode (const QPoint &, int &scrollMode, int &direction)
virtual double getValue (const QPoint &)
virtual void keyPressEvent (QKeyEvent *)
virtual void paintEvent (QPaintEvent *)
virtual void rangeChange ()
virtual void resizeEvent (QResizeEvent *)
virtual QwtText scaleLabel (double) const
virtual void updateMask ()
void updateScale ()
virtual void valueChange ()
Friends
class QwtDialScaleDraw
Additional Inherited Members
Detailed Description
QwtDial class provides a rounded range control.
QwtDial is intended as base class for dial widgets like speedometers, compass widgets,
clocks ...
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
enum QwtDial::Direction
Direction of the dial
enum QwtDial::Mode
In case of RotateNeedle the needle is rotating, in case of RotateScale, the needle points
to origin() and the scale is rotating.
enum QwtDial::Shadow
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
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.
Member Function Documentation
QRect QwtDial::boundingRect () const
Returns:
bounding rect of the dial including the frame
See also:
setLineWidth(), scaleContentsRect(), contentsRect()
QRect QwtDial::contentsRect () const
Returns:
bounding rect of the circle inside the frame
See also:
setLineWidth(), scaleContentsRect(), boundingRect()
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. 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]
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 QPoint ¢er, intradius, doubledirection,
QPalette::ColorGroupcg) 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 QPoint ¢er, intradius, doubleorigin,
doubleminArc, doublemaxArc) 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:
QwtAbstractScaleDraw::setAngleRange()
void QwtDial::drawScaleContents (QPainter *painter, const QPoint ¢er, intradius) 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.
QwtDial::Shadow QwtDial::frameShadow () const
Returns:
Frame shadow /sa setFrameShadow(), lineWidth(), QFrame::frameShadow
void QwtDial::getScrollMode (const QPoint &pos, int &scrollMode, int &direction) [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.
bool QwtDial::hasVisibleBackground () const
true when the area outside of the frame is visible
See also:
showBackground(), setMask()
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()
• 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.
int QwtDial::lineWidth () const
Returns:
Line width of the frame
See also:
setLineWidth(), frameShadow(), lineWidth()
double QwtDial::maxScaleArc () const
Returns:
Upper limit of the scale arc
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
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()
const QwtDialNeedle * QwtDial::needle () const
Returns:
needle
See also:
setNeedle()
QwtDialNeedle * QwtDial::needle ()
Returns:
needle
See also:
setNeedle()
double QwtDial::origin () const
The origin is the angle where scale and needle is relative to.
Returns:
Origin of the dial
See also:
setOrigin()
void QwtDial::paintEvent (QPaintEvent *e) [protected], [virtual]
Paint the dial
Parameters:
e Paint event
void QwtDial::resizeEvent (QResizeEvent *e) [protected], [virtual]
Resize the dial widget
Parameters:
e Resize event
QRect QwtDial::scaleContentsRect () const [virtual]
Returns:
rect inside the scale
See also:
setLineWidth(), boundingRect(), contentsRect()
QwtText QwtDial::scaleLabel (doublevalue) const [protected], [virtual]
Find the label for a value
Parameters:
value Value
Returns:
label
Reimplemented in QwtAnalogClock, and QwtCompass.
void QwtDial::setDirection (Directiondirection)
Set the direction of the dial (clockwise/counterclockwise)
Direction direction
See also:
direction()
void QwtDial::setFrameShadow (Shadowshadow)
Sets the frame shadow value from the frame style.
Parameters:
shadow Frame shadow
See also:
setLineWidth(), QFrame::setFrameShadow()
void QwtDial::setLineWidth (intlineWidth)
Sets the line width
Parameters:
lineWidth Line width
See also:
setFrameShadow()
void QwtDial::setMode (Modemode)
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]
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 QwtDial::setOrigin (doubleorigin) [virtual]
Change the origin. The origin is the angle where scale and needle is relative to.
Parameters:
origin New origin
See also:
origin()
void QwtDial::setScale (intmaxMajIntv, intmaxMinIntv, doublestep = 0.0) [virtual]
Change the intervals of the scale
See also:
QwtAbstractScaleDraw::setScale()
void QwtDial::setScaleArc (doubleminArc, doublemaxArc)
Change the arc of the scale
Parameters:
minArc Lower limit
maxArc Upper limit
void QwtDial::setScaleDraw (QwtDialScaleDraw *scaleDraw) [virtual]
Set an individual scale draw
Parameters:
scaleDraw Scale draw
Warning:
The previous scale draw is deleted
void QwtDial::setScaleOptions (intoptions)
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)
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 QwtDial::setWrapping (boolwrapping) [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.
void QwtDial::showBackground (boolshow)
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]
Returns:
Size hint
void QwtDial::updateMask () [protected], [virtual]
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]
Update the scale with the current attributes
See also:
setScale()
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.
Author
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