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 &center, double radius, double origin, double arcMin, double arcMax) const virtual void drawScaleContents (QPainter *painter, const QPointF &center, 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: Note:

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: 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:¶

See also:

QwtDial::Direction QwtDial::direction () const Returns:¶

The default direction of a dial is QwtDial::Clockwise See also:

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 a dotted round circle, if !isReadOnly()¶

Parameters:

void QwtDial::drawFrame (QPainter *painter) [protected, virtual] Draw the frame around the dial¶

Parameters: See also:

void QwtDial::drawNeedle (QPainter *painter, const QPointF &center, doubleradius, doubledirection, QPalette::ColorGroupcg) const [protected, virtual] Draw the needle¶

Parameters: Reimplemented in QwtAnalogClock.

void QwtDial::drawScale (QPainter *painter, const QPointF &center, doubleradius, doubleorigin, doubleminArc, doublemaxArc) const [protected, virtual] Draw the scale¶

Parameters: See also:

void QwtDial::drawScaleContents (QPainter *painter, const QPointF &center, doubleradius) const [protected, virtual] Draw the contents inside the scale¶

Paints nothing. Parameters: Reimplemented in QwtCompass.

QwtDial::Shadow QwtDial::frameShadow () const Returns:¶

void QwtDial::getScrollMode (const QPoint &pos, QwtAbstractSlider::ScrollMode &scrollMode, int &direction) const [protected, virtual] See QwtAbstractSlider::getScrollMode()¶

Parameters: Return values: See also: Implements QwtAbstractSlider.

double QwtDial::getValue (const QPoint &pos) [protected, virtual] Find the value for a given position¶

Parameters: Returns: Implements QwtAbstractSlider.

QRectF QwtDial::innerRect () const Returns:¶

See also:

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: See also: Reimplemented from QwtAbstractSlider. Reimplemented in QwtCompass.

int QwtDial::lineWidth () const Returns:¶

See also:

double QwtDial::maxScaleArc () const Returns:¶

QSize QwtDial::minimumSizeHint () const [virtual]¶

Return a minimum size hint. Warning:

double QwtDial::minScaleArc () const Returns:¶

QwtDial::Mode QwtDial::mode () const Returns:¶

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:

QwtDialNeedle * QwtDial::needle () Returns:¶

See also:

const QwtDialNeedle * QwtDial::needle () const 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 dial¶

Parameters:

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:¶

See also:

QwtText QwtDial::scaleLabel (doublevalue) const [protected, virtual] Find the label for a value¶

Parameters: Returns: Reimplemented in QwtAnalogClock, and QwtCompass.

void QwtDial::setDirection (Directiondirection) Set the direction of the dial (clockwise/counterclockwise)¶

Parameters: See also:

void QwtDial::setFrameShadow (Shadowshadow) Sets the frame shadow value from the frame style.¶

Parameters: See also:

void QwtDial::setLineWidth (intlineWidth) Sets the line width¶

Parameters: See also:

void QwtDial::setMode (Modemode)¶

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:

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: 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::setScale (intmaxMajIntv, intmaxMinIntv, doublestep = 0.0) [virtual] Change the intervals of the scale¶

Parameters: See also:

void QwtDial::setScaleArc (doubleminArc, doublemaxArc) Change the arc of the scale¶

Parameters:

void QwtDial::setScaleComponents (QwtAbstractScaleDraw::ScaleComponentscomponents) A wrapper method for accessing the scale draw.¶

Parameters: See also:

void QwtDial::setScaleDraw (QwtDialScaleDraw *scaleDraw) [virtual] Set an individual scale draw¶

Parameters: Warning:

void QwtDial::setScaleTicks (intminLen, intmedLen, intmajLen, intpenWidth = 1) Assign length and width of the ticks¶

Parameters: See also:

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: See also: Note:

QSize QwtDial::sizeHint () const [virtual] Returns:¶

void QwtDial::updateScale () [protected] Update the scale with the current attributes¶

See also:

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: Note:

Author¶

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