QwtWheel(3)

NAME
QwtWheel - The Wheel Widget.

SYNOPSIS

#include <qwt_wheel.h>

Inherits QwtSliderBase.

  Public Methods
QwtWheel (QWidget *parent=0, const char *name=0)
virtual ~QwtWheel ()
void setTotalAngle (double angle)
void setTickCnt (int cnt)
void setOrientation (Qt::Orientation o)
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 Methods
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)

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.

CONSTRUCTOR & DESTRUCTOR DOCUMENTATION

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

Constructor.

  QwtWheel::~QwtWheel () [virtual]

Destructor.

MEMBER FUNCTION DOCUMENTATION

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

Redraw panel and wheel.

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

Redraw the wheel.

Parameters:

p   painter

r   contents rectangle

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

Draw the Wheel's background gradient.

  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

Reimplemented from QwtSliderBase.

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

Determine the value corresponding to a specified point.

Reimplemented from QwtSliderBase.

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

Recalculate the slider's geometry and layout based on.

  QSize QwtWheel::minimumSizeHint () const [virtual]

Return a minimum size hint.

Warning:
The return value is based on the wheel width.

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

Qt Paint Event.

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

Call update() when the palette changes.

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

Qt Resize Event.

  void QwtWheel::setColorArray () [protected]

Set up the color array for the background pixmap.

  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

  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.

  void QwtWheel::setOrientation (Qt::Orientation o)

Set the wheel's orientation.

Parameters:

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

  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

  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

  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

  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

  QSize QwtWheel::sizeHint () const [virtual]

Returns:
a size hint

  QSizePolicy QwtWheel::sizePolicy () const [virtual]

Returns:
Preferred/Fixed for horizontal, Fixed/Preferred for vertical scales.

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

Notify value change.

Reimplemented from QwtSliderBase.

AUTHOR

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