QwtDial

Section: Qwt User's Guide (3) Updated: 16 Nov 2004 Local index Up

NAME

QwtDial -

SYNOPSIS

Inherits QwtSliderBase.

Inherited by QwtAnalogClock, and QwtCompass.

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.

Definition at line 72 of file qwt_dial.h.

Public Types

enum Shadow { Plain = QFrame::Plain, Raised = QFrame::Raised, Sunken = QFrame::Sunken }

enum ScaleOptions { ScaleBackbone = 1, ScaleTicks = 2, ScaleLabel = 4 }

enum Mode { RotateNeedle, RotateScale }

Public Member Functions

QwtDial (QWidget *parent=0, const char *name=0)

virtual ~QwtDial ()

void setFrameShadow (Shadow)

Shadow frameShadow () const

bool hasVisibleBackground () const

void showBackground (bool)

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 setScaleOptions (int)

void setScaleTicks (int minLen, int medLen, int majLen, int penWidth=1)

double minScaleArc () const

double maxScaleArc () const

virtual void setOrigin (double)

double origin () const

virtual void setNeedle (QwtDialNeedle *)

const QwtDialNeedle * needle () const

QwtDialNeedle * needle ()

QRect boundingRect () const

QRect contentsRect () const

virtual QRect scaleContentsRect () 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 resizeEvent (QResizeEvent *)

virtual void keyPressEvent (QKeyEvent *)

virtual void drawFrame (QPainter *p)

virtual void drawContents (QPainter *) const

virtual void drawFocusIndicator (QPainter *) 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

virtual void drawNeedle (QPainter *, const QPoint &, int radius, double direction, QPalette::ColorGroup) const

virtual QString scaleLabel (double) const

void updateScale ()

virtual void rangeChange ()

virtual void valueChange ()

virtual double getValue (const QPoint &)

virtual void getScrollMode (const QPoint &, int &scrollMode, int &direction)

Member Enumeration Documentation

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. Definition at line 117 of file qwt_dial.h.

Referenced by mode().

enum QwtDial::ScaleOptions

see QwtDial::setScaleOptions

Definition at line 105 of file qwt_dial.h.

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. Definition at line 97 of file qwt_dial.h.

Referenced by frameShadow().

Constructor & Destructor Documentation

QwtDial::QwtDial (QWidget * parent = 0, const char * name = 0)

Constructor.

Parameters:

: parent Parent widget
name Widget name

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. Definition at line 107 of file qwt_dial.cpp.

References QwtScaleDraw::setGeometry(), QwtDblRange::setRange(), and setScaleArc().

QwtDial::~QwtDial () [virtual]

Destructor.

Definition at line 147 of file qwt_dial.cpp.

Member Function Documentation

QRect QwtDial::boundingRect () const

Returns:

: bounding rect of the dial including the frame

See also:

: QwtDial::setLineWidth, QwtDial::scaleContentsRect, QwtDial::contentsRect

Definition at line 260 of file qwt_dial.cpp.

Referenced by contentsRect(), drawContents(), drawFrame(), resizeEvent(), and showBackground().

QRect QwtDial::contentsRect () const

Returns:

: bounding rect of the circle inside the frame

See also:

: QwtDial::setLineWidth, QwtDial::scaleContentsRect, QwtDial::boundingRect

Definition at line 243 of file qwt_dial.cpp.

References boundingRect(), and lineWidth().

Referenced by drawFocusIndicator(), getScrollMode(), and scaleContentsRect().

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:

: QwtDial::boundingRect, QwtDial::contentsRect, QwtDial::scaleContentsRect, QWidget::setPalette

Definition at line 475 of file qwt_dial.cpp.

References boundingRect(), drawNeedle(), drawScale(), drawScaleContents(), QwtSliderBase::isValid(), QwtDblRange::maxValue(), QwtDblRange::minValue(), mode(), origin(), scaleContentsRect(), and QwtDblRange::value().

Referenced by paintEvent().

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

Draw a dotted round circle, if !isReadOnly()

Parameters:

: painter Painter

Definition at line 394 of file qwt_dial.cpp.

References contentsRect(), and QwtSliderBase::isReadOnly().

Referenced by paintEvent().

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

Draw the frame around the dial

Parameters:

: painter Painter

See also:

: QwtDial::lineWidth, QwtDial::frameShadow

Definition at line 431 of file qwt_dial.cpp.

References boundingRect(), QwtPainter::drawRoundFrame(), and lineWidth().

Referenced by paintEvent().

void QwtDial::drawNeedle (QPainter * painter, const QPoint & center, int radius, double direction, QPalette::ColorGroup cg) const [protected, virtual]

Draw the needle

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

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.

Definition at line 584 of file qwt_dial.cpp.

References QwtDialNeedle::draw().

Referenced by drawContents().

void QwtDial::drawScale (QPainter * painter, const QPoint & center, int 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:

: QwtScaleDraw::setAngleRange

Definition at line 606 of file qwt_dial.cpp.

References QwtScaleDraw::draw(), QwtDialScaleDraw::penWidth(), QwtScaleDraw::setAngleRange(), and QwtScaleDraw::setGeometry().

Referenced by drawContents().

void QwtDial::drawScaleContents (QPainter * painter, const QPoint & center, int 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.

Definition at line 643 of file qwt_dial.cpp.

Referenced by drawContents().

QwtDial::Shadow QwtDial::frameShadow () const

Returns:

: Frame shadow /sa QwtDial::setFrameShadow, QwtDial::lineWidth, QFrame::frameShadow

Definition at line 206 of file qwt_dial.cpp.

References Shadow.

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

See also:

: QwtSliderBase::getScrollMode

Implements QwtSliderBase.

Definition at line 1012 of file qwt_dial.cpp.

References contentsRect().

double QwtDial::getValue (const QPoint & pos) [protected, virtual]

Find the value for a given position

Parameters:

pos .RE

Returns:

: Value

Implements QwtSliderBase.

Definition at line 909 of file qwt_dial.cpp.

References QwtDblRange::maxValue(), QwtDblRange::minValue(), mode(), QwtDblRange::value(), and wrapping().

bool QwtDial::hasVisibleBackground () const

TRUE when the area outside of the frame is visible

See also:

: QwtDial::showBackground, QWidget::setMask

Definition at line 181 of file qwt_dial.cpp.

Referenced by resizeEvent().

void QwtDial::keyPressEvent (QKeyEvent * e) [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()

See also:

: isReadOnly()

Reimplemented from QwtSliderBase.

Reimplemented in QwtCompass.

Definition at line 1044 of file qwt_dial.cpp.

References QwtDblRange::incValue(), QwtSliderBase::isReadOnly(), QwtSliderBase::isValid(), QwtDblRange::maxValue(), QwtDblRange::minValue(), QwtDblRange::pageSize(), QwtDblRange::prevValue(), QwtSliderBase::setValue(), QwtSliderBase::sliderMoved(), and QwtDblRange::value().

Referenced by QwtCompass::keyPressEvent().

int QwtDial::lineWidth () const

Returns:

: Line width of the frame

See also:

: QwtDial::setLineWidth, QwtDial::frameShadow, QFrame::lineWidth

Definition at line 234 of file qwt_dial.cpp.

Referenced by contentsRect(), drawFrame(), minimumSizeHint(), setFrameShadow(), and sizeHint().

double QwtDial::maxScaleArc () const

Return the upper limit of the scale arc.

Definition at line 150 of file qwt_dial.h.

QSize QwtDial::minimumSizeHint () const [virtual]

Return a minimum size hint.

Warning:

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

Definition at line 874 of file qwt_dial.cpp.

References lineWidth(), and QwtScaleDraw::minHeight().

double QwtDial::minScaleArc () const

Return the lower limit of the scale arc.

Definition at line 148 of file qwt_dial.h.

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:

: QwtDial::setMode, QwtDial::origin, QwtDial::setScaleArc, QwtDial::value

Definition at line 329 of file qwt_dial.cpp.

References Mode.

Referenced by drawContents(), QwtCompass::drawScaleContents(), getValue(), and QwtCompass::keyPressEvent().

QwtDialNeedle * QwtDial::needle ()

Returns:

: needle

See also:

: QwtDial::setNeedle

Definition at line 684 of file qwt_dial.cpp.

const QwtDialNeedle * QwtDial::needle () const

Returns:

: needle

See also:

: QwtDial::setNeedle

Definition at line 675 of file qwt_dial.cpp.

double QwtDial::origin () const

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

Returns:

: Origin of the dial

See also:

: QwtDial::setOrigin()

Definition at line 822 of file qwt_dial.cpp.

Referenced by drawContents(), QwtAnalogClock::drawNeedle(), QwtCompass::drawScaleContents(), and QwtCompass::keyPressEvent().

void QwtDial::paintEvent (QPaintEvent *) [protected, virtual]

Repaint the dial.

Definition at line 372 of file qwt_dial.cpp.

References drawContents(), drawFocusIndicator(), drawFrame(), and QwtPaintBuffer::painter().

void QwtDial::rangeChange () [protected, virtual]

QwtDblRange update hook.

Reimplemented from QwtDblRange.

Definition at line 690 of file qwt_dial.cpp.

References updateScale().

void QwtDial::resizeEvent (QResizeEvent *) [protected, virtual]

Resize the dial widget.

Definition at line 363 of file qwt_dial.cpp.

References boundingRect(), and hasVisibleBackground().

QRect QwtDial::scaleContentsRect () const [virtual]

Returns:

: rect inside the scale

See also:

: setLineWidth, QwtDial::boundingRect, QwtDial::contentsRect

Definition at line 273 of file qwt_dial.cpp.

References contentsRect(), QwtScaleDraw::maxHeight(), and QwtScaleDraw::maxWidth().

Referenced by drawContents().

const QwtDialScaleDraw* QwtDial::scaleDraw () const

Return the scale draw.

Definition at line 171 of file qwt_dial.h.

QwtDialScaleDraw* QwtDial::scaleDraw ()

Return the scale draw.

Definition at line 169 of file qwt_dial.h.

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

Returns:

: the label for a value

Reimplemented in QwtAnalogClock, and QwtCompass.

Definition at line 789 of file qwt_dial.cpp.

Referenced by QwtDialScaleDraw::label().

void QwtDial::setFrameShadow (Shadow shadow)

Sets the frame shadow value from the frame style.

Parameters:

: shadow Frame shadow

See also:

: QwtDial::setLineWidth, QFrame::setFrameShadow

Definition at line 191 of file qwt_dial.cpp.

References lineWidth().

void QwtDial::setLineWidth (int lineWidth)

Sets the line width

Parameters:

: lineWidth Line width

See also:

: QwtDial::setFrameShadow

Definition at line 217 of file qwt_dial.cpp.

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:

: QwtDial::mode, QwtDial::setValue, QwtDial::setOrigin

Definition at line 306 of file qwt_dial.cpp.

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

Definition at line 659 of file qwt_dial.cpp.

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:

: QwtDial::origin()

Definition at line 810 of file qwt_dial.cpp.

Referenced by QwtAnalogClock::QwtAnalogClock(), and QwtCompass::QwtCompass().

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

Change the intervals of the scale

See also:

: QwtScaleDraw::setScale

Definition at line 730 of file qwt_dial.cpp.

References updateScale().

Referenced by QwtAnalogClock::QwtAnalogClock().

void QwtDial::setScaleArc (double minArc, double maxArc)

Change the arc of the scale

Parameters:

: minArc Lower limit
maxArc Upper limit

Definition at line 833 of file qwt_dial.cpp.

Referenced by QwtDial().

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

Set an individual scale draw

Warning:

: The previous scale draw is deleted

Definition at line 713 of file qwt_dial.cpp.

References updateScale().

Referenced by setScaleOptions().

void QwtDial::setScaleOptions (int options)

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

Don´t change anything. Otherwise set all tick lengths to 0.
•: options & ScaleLabel

En/disable scale labels