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# QwtWheel Class Reference

Inheritance diagram for QwtWheel:

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Collaboration diagram for QwtWheel:

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List of all members.

## 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:
  | angle | total angle in degrees
Definition at line 224 of file qwt_wheel.cpp. References qwtLim().

void QwtWheel::setViewAngle | ( | double | angle | ) |

  | Specify the visible portion of the wheel. You may use this function for fine-tuning the appearance of the wheel. The default value is 175 degrees. The value is limited from 10 to 175 degrees. Parameters:
  | angle | Visible angle in degrees
Definition at line 254 of file qwt_wheel.cpp. References qwtLim().

void QwtWheel::setWheelWidth | ( | int | w | ) |

  | Set the width of the wheel. Corresponds to the wheel height for horizontal orientation, and the wheel width for vertical orientation. Parameters:
  | w | the wheel's width
Definition at line 509 of file qwt_wheel.cpp. References layoutWheel().

QSize QwtWheel::sizeHint | ( |  | ) | const`[virtual]`

| Returns: a size hint Definition at line 539 of file qwt_wheel.cpp. References minimumSizeHint().

QSizePolicy QwtWheel::sizePolicy | ( |  | ) | const`[virtual]`

| Returns: Preferred/Fixed for horizontal, Fixed/Preferred for vertical scales. Definition at line 520 of file qwt_wheel.cpp. References QwtSliderBase::orientation().

void QwtWheel::valueChange | ( |  | ) | `[protected, virtual]`

| Notify value change. Reimplemented from QwtSliderBase. Definition at line 467 of file qwt_wheel.cpp. References QwtSliderBase::valueChange().