QwtWheel

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

NAME

QwtWheel -

SYNOPSIS

Inherits QwtSliderBase.

Detailed Description

The Wheel Widget.

The wheel widget can be used to change values over a very large range in very small steps. Using the setMass member, it can be configured as a flywheel.

See also:

: The radio example.

Definition at line 25 of file qwt_wheel.h.

Public Member Functions

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

virtual ~QwtWheel ()

virtual void setOrientation (Qt::Orientation)

double totalAngle () const

double viewAngle () const

int tickCnt () const

int internalBorder () const

double mass () const

void setTotalAngle (double angle)

void setTickCnt (int cnt)

void setViewAngle (double angle)

void setInternalBorder (int width)

void setMass (double val)

void setWheelWidth (int w)

virtual QSize sizeHint () const

virtual QSize minimumSizeHint () const

virtual QSizePolicy sizePolicy () const

Protected Member Functions

virtual void resizeEvent (QResizeEvent *e)

virtual void paintEvent (QPaintEvent *e)

void layoutWheel (bool update=TRUE)

void draw (QPainter *p, const QRect &update_rect)

void drawWheel (QPainter *p, const QRect &r)

void drawWheelBackground (QPainter *p, const QRect &r)

void setColorArray ()

virtual void valueChange ()

virtual void paletteChange (const QPalette &)

virtual double getValue (const QPoint &p)

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

Constructor & Destructor Documentation

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

Constructor.

Definition at line 20 of file qwt_wheel.cpp.

References QwtSliderBase::setUpdateTime().

QwtWheel::~QwtWheel () [virtual]

Destructor.

Definition at line 37 of file qwt_wheel.cpp.

Member Function Documentation

void QwtWheel::draw (QPainter * p, const QRect & update_rect) [protected]

Redraw panel and wheel.

Definition at line 437 of file qwt_wheel.cpp.

References drawWheel().

Referenced by paintEvent().

void QwtWheel::drawWheel (QPainter * p, const QRect & r) [protected]

Redraw the wheel.

Parameters:

: p painter
r contents rectangle

Definition at line 265 of file qwt_wheel.cpp.

References drawWheelBackground(), QwtDblRange::maxValue(), QwtDblRange::minValue(), QwtSliderBase::orientation(), and QwtDblRange::value().

Referenced by draw().

void QwtWheel::drawWheelBackground (QPainter * p, const QRect & r) [protected]

Draw the Wheel's background gradient.

Definition at line 123 of file qwt_wheel.cpp.

References QwtSliderBase::orientation(), and setColorArray().

Referenced by drawWheel().

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

Determine the scrolling mode and direction corresponding to a specified point.

Parameters:

: p point
scrollMode scrolling mode
direction direction

Implements QwtSliderBase.

Definition at line 481 of file qwt_wheel.cpp.

double QwtWheel::getValue (const QPoint & p) [protected, virtual]

Determine the value corresponding to a specified point.

Implements QwtSliderBase.

Definition at line 372 of file qwt_wheel.cpp.

References QwtDblRange::maxValue(), QwtDblRange::minValue(), and QwtSliderBase::orientation().

void QwtWheel::layoutWheel (bool update = TRUE) [protected]

Recalculate the slider's geometry and layout based on.

Definition at line 411 of file qwt_wheel.cpp.

Referenced by resizeEvent(), setInternalBorder(), setOrientation(), and setWheelWidth().

double QwtWheel::mass () const [virtual]

Returns:

: mass

Reimplemented from QwtSliderBase.

Definition at line 97 of file qwt_wheel.cpp.

References QwtSliderBase::mass().

QSize QwtWheel::minimumSizeHint () const [virtual]

Return a minimum size hint.

Warning:

: The return value is based on the wheel width.

Definition at line 548 of file qwt_wheel.cpp.

References QwtSliderBase::orientation().

Referenced by sizeHint().

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

Qt Paint Event.

Definition at line 425 of file qwt_wheel.cpp.

References draw(), and QwtPaintBuffer::painter().

void QwtWheel::paletteChange (const QPalette &) [protected, virtual]

Call update() when the palette changes.

Definition at line 560 of file qwt_wheel.cpp.

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

Qt Resize Event.

Definition at line 402 of file qwt_wheel.cpp.

References layoutWheel().

void QwtWheel::setColorArray () [protected]

Set up the color array for the background pixmap.

Definition at line 45 of file qwt_wheel.cpp.

Referenced by drawWheelBackground().

void QwtWheel::setInternalBorder (int w)

Set the internal border width of the wheel.

The internal border must not be smaller than 1 and is limited in dependence on the wheel's size. Values outside the allowed range will be clipped.

The internal border defaults to 2.

Parameters:

: w border width

Definition at line 114 of file qwt_wheel.cpp.

References layoutWheel().

void QwtWheel::setMass (double val) [virtual]

Set the mass of the wheel.

Assigning a mass turns the wheel into a flywheel.

Parameters:

: val the wheel's mass

Reimplemented from QwtSliderBase.

Definition at line 497 of file qwt_wheel.cpp.

References QwtSliderBase::setMass().

void QwtWheel::setOrientation (Qt::Orientation o) [virtual]

Set the wheel's orientation.

Parameters:

: o Orientation. Allowed values are Qt::Horizontal and Qt::Vertical. Defaults to Qt::Horizontal.

See also:

: QwtSliderBase::orientation()

Definition at line 237 of file qwt_wheel.cpp.

References layoutWheel(), QwtSliderBase::orientation(), and QwtSliderBase::setOrientation().

void QwtWheel::setTickCnt (int cnt)

Adjust the number of grooves in the wheel's surface.

The number of grooves is limited to 6 <= cnt <= 50. Values outside this range will be clipped. The default value is 10.

Parameters:

: cnt Number of grooves per 360 degrees

Definition at line 88 of file qwt_wheel.cpp.

References qwtLim().

void QwtWheel::setTotalAngle (double angle)

Set the total angle which the wheel can be turned.

One full turn of the wheel corresponds to an angle of 360 degrees. A total angle of n*360 degrees means that the wheel has to be turned n times around its axis to get from the minimum value to the maximum value.

The default setting of the total angle is 360 degrees.

Parameters: