QwtDial(3) | Qwt User's Guide | QwtDial(3) |
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 }
Frame shadow. enum Mode { RotateNeedle, RotateScale }
Mode controlling whether the needle or the scale is rotating.
Public Member Functions¶
QwtDial (QWidget *parent=NULL)
Constructor. virtual ~QwtDial ()
Destructor. void setFrameShadow (Shadow)
Shadow frameShadow () const
void setLineWidth (int)
int lineWidth () const
void setMode (Mode)
Change the mode of the dial. Mode mode () const
void setScaleArc (double min, double max)
void setMinScaleArc (double min)
double minScaleArc () const
void setMaxScaleArc (double min)
double maxScaleArc () const
virtual void setOrigin (double)
Change the origin. double origin () const
void setNeedle (QwtDialNeedle *)
const QwtDialNeedle * needle () const
QwtDialNeedle * needle ()
QRect boundingRect () const
QRect innerRect () const
virtual QRect scaleInnerRect () const
virtual QSize sizeHint () const
virtual QSize minimumSizeHint () const
void setScaleDraw (QwtRoundScaleDraw *)
QwtRoundScaleDraw * scaleDraw ()
const QwtRoundScaleDraw * scaleDraw () const
Protected Member Functions¶
virtual void wheelEvent (QWheelEvent *)
virtual void paintEvent (QPaintEvent *)
virtual void changeEvent (QEvent *)
virtual void drawFrame (QPainter *p)
virtual void drawContents (QPainter *) const
Draw the contents inside the frame. virtual void drawFocusIndicator (QPainter *) const
void invalidateCache ()
virtual void drawScale (QPainter *, const QPointF ¢er, double radius) 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 double scrolledTo (const QPoint &) const
Determine the value for a new position of the slider handle. virtual bool isScrollPosition (const QPoint &) const
Determine what to do when the user presses a mouse button. virtual void sliderChange ()
Calling update() virtual void scaleChange ()
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 QwtAbstractSlider::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.
Often dials have to be updated very often according to values from external devices. For these high refresh rates QwtDial caches as much as possible. For derived classes it might be necessary to clear these caches manually according to attribute changes using invalidateCache().
See Also:
Note:
QDial is more similar to QwtKnob than to QwtDial
Member Enumeration Documentation¶
enum QwtDial::Mode¶
Mode controlling whether 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:
Create a dial widget with no needle. The scale is initialized to [ 0.0, 360.0 ] and 360 steps ( QwtAbstractSlider::setTotalSteps() ). The origin of the scale is at 90°,
The value is set to 0.0.
The default mode is QwtDial::RotateNeedle.
Member Function Documentation¶
QRect QwtDial::boundingRect () const¶
Returns:See Also:
void QwtDial::changeEvent (QEvent *event) [protected], [virtual]¶
Change Event handlerParameters:
Invalidates internal paint caches if necessary
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:
See Also:
void QwtDial::drawFocusIndicator (QPainter *painter) const [protected], [virtual]¶
Draw the focus indicatorParameters:
void QwtDial::drawFrame (QPainter *painter) [protected], [virtual]¶
Draw the frame around the dialParameters:
See Also:
void QwtDial::drawNeedle (QPainter *painter, const QPointF ¢er, doubleradius, doubledirection, QPalette::ColorGroupcolorGroup) const [protected], [virtual]¶
Draw the needleParameters:
center Center of the dial
radius Length for the needle
direction Direction of the needle in degrees, counter clockwise
colorGroup ColorGroup
Reimplemented in QwtAnalogClock.
void QwtDial::drawScale (QPainter *painter, const QPointF ¢er, doubleradius) const [protected], [virtual]¶
Draw the scaleParameters:
center Center of the dial
radius Radius of the scale
void QwtDial::drawScaleContents (QPainter *painter, const QPointF ¢er, doubleradius) const [protected], [virtual]¶
Draw the contents inside the scalePaints nothing.
Parameters:
center Center of the contents circle
radius Radius of the contents circle
Reimplemented in QwtCompass.
QwtDial::Shadow QwtDial::frameShadow () const¶
Returns:QRect QwtDial::innerRect () const¶
Returns:See Also:
void QwtDial::invalidateCache () [protected]¶
Invalidate the internal caches used to speed up repaintingbool QwtDial::isScrollPosition (const QPoint &pos) const [protected], [virtual]¶
Determine what to do when the user presses a mouse button.Parameters:
Return values:
See Also:
Implements QwtAbstractSlider.
int QwtDial::lineWidth () const¶
Returns:See Also:
double QwtDial::maxScaleArc () const¶
Returns:See Also:
QSize QwtDial::minimumSizeHint () const [virtual]¶
Returns:See Also:
double QwtDial::minScaleArc () const¶
Returns:See Also:
QwtDial::Mode QwtDial::mode () const¶
Returns:See Also:
const QwtDialNeedle * QwtDial::needle () const¶
Returns:See Also:
QwtDialNeedle * QwtDial::needle ()¶
Returns:See Also:
double QwtDial::origin () const¶
The origin is the angle where scale and needle is relative to.Returns:
See Also:
void QwtDial::paintEvent (QPaintEvent *event) [protected], [virtual]¶
Paint the dialParameters:
void QwtDial::scaleChange () [protected], [virtual]¶
Invalidate the internal caches and call QwtAbstractSlider::scaleChange()Reimplemented from QwtAbstractSlider.
QwtRoundScaleDraw * QwtDial::scaleDraw ()¶
Returns:const QwtRoundScaleDraw * QwtDial::scaleDraw () const¶
Returns:QRect QwtDial::scaleInnerRect () const [virtual]¶
Returns:See Also:
double QwtDial::scrolledTo (const QPoint &pos) const [protected], [virtual]¶
Determine the value for a new position of the slider handle.Parameters:
Returns:
See Also:
Implements QwtAbstractSlider.
void QwtDial::setFrameShadow (Shadowshadow)¶
Sets the frame shadow value from the frame style.Parameters:
See Also:
void QwtDial::setLineWidth (intlineWidth)¶
Sets the line width of the frameParameters:
See Also:
void QwtDial::setMaxScaleArc (doublemax)¶
Set the upper limit for the scale arcParameters:
See Also:
void QwtDial::setMinScaleArc (doublemin)¶
Set the lower limit for the scale arcParameters:
See Also:
void QwtDial::setMode (Modemode)¶
Change the mode of the dial.Parameters:
In case of QwtDial::RotateNeedle 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:
void QwtDial::setNeedle (QwtDialNeedle *needle)¶
Set a needle for the dialParameters:
Warning:
void QwtDial::setOrigin (doubleorigin) [virtual]¶
Change the origin. The origin is the angle where scale and needle is relative to.Parameters:
See Also:
void QwtDial::setScaleArc (doubleminArc, doublemaxArc)¶
Change the arc of the scaleParameters:
maxArc Upper limit
See Also:
void QwtDial::setScaleDraw (QwtRoundScaleDraw *scaleDraw)¶
Set an individual scale drawThe motivation for setting a scale draw is often to overload QwtRoundScaleDraw::label() to return individual tick labels.
Parameters:
Warning:
QSize QwtDial::sizeHint () const [virtual]¶
Returns:See Also:
void QwtDial::wheelEvent (QWheelEvent *event) [protected], [virtual]¶
Wheel Event handlerParameters:
Reimplemented from QwtAbstractSlider.
Author¶
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