Provided by: libqwt-doc_6.0.0-1.2_all 
NAME
QwtDial -
QwtDial class provides a rounded range control.
SYNOPSIS
#include <qwt_dial.h>
Inherits QwtAbstractSlider.
Inherited by QwtAnalogClock, and QwtCompass.
Public Types
enum Shadow { Plain = QFrame::Plain, Raised = QFrame::Raised, Sunken = QFrame::Sunken }
enum Mode { RotateNeedle, RotateScale }
enum Direction { Clockwise, CounterClockwise }
Public Member Functions
QwtDial (QWidget *parent=NULL)
virtual ~QwtDial ()
void setFrameShadow (Shadow)
Shadow frameShadow () const
void setLineWidth (int)
int lineWidth () const
void setMode (Mode)
Mode mode () const
virtual void setWrapping (bool)
bool wrapping () const
virtual void setScale (int maxMajIntv, int maxMinIntv, double step=0.0)
void setScaleArc (double min, double max)
void setScaleComponents (QwtAbstractScaleDraw::ScaleComponents)
void setScaleTicks (int minLen, int medLen, int majLen, int penWidth=1)
double minScaleArc () const
double maxScaleArc () const
virtual void setOrigin (double)
double origin () const
void setDirection (Direction)
Direction direction () const
virtual void setNeedle (QwtDialNeedle *)
const QwtDialNeedle * needle () const
QwtDialNeedle * needle ()
QRectF boundingRect () const
QRectF innerRect () const
virtual QRectF scaleInnerRect () const
virtual QSize sizeHint () const
virtual QSize minimumSizeHint () const
virtual void setScaleDraw (QwtDialScaleDraw *)
QwtDialScaleDraw * scaleDraw ()
const QwtDialScaleDraw * scaleDraw () const
Protected Member Functions
virtual void paintEvent (QPaintEvent *)
virtual void keyPressEvent (QKeyEvent *)
virtual void drawFrame (QPainter *p)
virtual void drawContents (QPainter *) const
virtual void drawFocusIndicator (QPainter *) const
virtual void drawScale (QPainter *, const QPointF ¢er, double radius, double origin, double arcMin,
double arcMax) const
virtual void drawScaleContents (QPainter *painter, const QPointF ¢er, double radius) const
virtual void drawNeedle (QPainter *, const QPointF &, double radius, double direction,
QPalette::ColorGroup) const
virtual QwtText scaleLabel (double) const
void updateScale ()
virtual void rangeChange ()
virtual void valueChange ()
virtual double getValue (const QPoint &)
virtual void getScrollMode (const QPoint &, QwtAbstractSlider::ScrollMode &, int &direction) const
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 ...
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.
Enumerator:
Clockwise
Clockwise.
CounterClockwise
Counter clockwise.
enum QwtDial::Mode
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 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.
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 ¢er, doubleradius, 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 QPointF ¢er, doubleradius, 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:
QwtRoundScaleDraw::setAngleRange()
void QwtDial::drawScaleContents (QPainter *painter, const QPointF ¢er, doubleradius) 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, 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.
QRectF QwtDial::innerRect () const Returns:
bounding rect of the circle inside the frame
See also:
setLineWidth(), scaleInnerRect(), boundingRect()
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()
QwtDialNeedle * QwtDial::needle () Returns:
needle
See also:
setNeedle()
const QwtDialNeedle * QwtDial::needle () const 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 *event) [protected, virtual] Paint the dial
Parameters:
event Paint event
void QwtDial::rangeChange () [protected, virtual]
QwtDoubleRange update hook.
Reimplemented from QwtDoubleRange.
QwtDialScaleDraw * QwtDial::scaleDraw ()
Return the scale draw.
const QwtDialScaleDraw * QwtDial::scaleDraw () const
Return the scale draw.
QRectF QwtDial::scaleInnerRect () const [virtual] Returns:
rect inside the scale
See also:
setLineWidth(), boundingRect(), innerRect()
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)
Parameters:
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
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 (doubleminArc, doublemaxArc) Change the arc of the scale
Parameters:
minArc Lower limit
maxArc Upper limit
void QwtDial::setScaleComponents (QwtAbstractScaleDraw::ScaleComponentscomponents) 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 (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.
QSize QwtDial::sizeHint () const [virtual] Returns:
Size hint
void QwtDial::updateScale () [protected] Update the scale with the current attributes
See also:
setScale()
void QwtDial::valueChange () [protected, virtual]
QwtDoubleRange update hook.
Reimplemented from QwtAbstractSlider.
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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