QwtKnob(3) Qwt User's Guide QwtKnob(3)NAMEQwtKnob-
SYNOPSIS
#include <qwt_knob.h>
Inherits QwtAbstractSlider, and QwtAbstractScale.
Public Types
enum Symbol { Line, Dot }
Public Member Functions
QwtKnob (QWidget *parent=NULL)
virtual ~QwtKnob ()
int borderWidth () const
int knobWidth () const
virtual QSize minimumSizeHint () const
const QwtRoundScaleDraw * scaleDraw () const
QwtRoundScaleDraw * scaleDraw ()
void setBorderWidth (int bw)
void setKnobWidth (int w)
void setScaleDraw (QwtRoundScaleDraw *)
void setSymbol (Symbol)
void setTotalAngle (double angle)
virtual QSize sizeHint () const
Symbol symbol () const
double totalAngle () const
Protected Member Functions
void draw (QPainter *p, const QRect &ur)
void drawKnob (QPainter *p, const QRect &r)
void drawMarker (QPainter *p, double arc, const QColor &c)
virtual void paintEvent (QPaintEvent *e)
virtual void resizeEvent (QResizeEvent *e)
Additional Inherited Members
Detailed Description
The Knob Widget.
The QwtKnob widget imitates look and behaviour of a volume knob on a
radio. It contains a scale around the knob which is set up
automatically or can be configured manually (see QwtAbstractScale).
Automatic scrolling is enabled when the user presses a mouse button on
the scale. For a description of signals, slots and other members, see
QwtAbstractSlider.
See also:
QwtAbstractSlider and QwtAbstractScale for the descriptions of the
inherited members.
Member Enumeration Documentation
enum QwtKnob::Symbol
Symbol
See also:
QwtKnob::QwtKnob()Constructor & Destructor Documentation
QwtKnob::QwtKnob (QWidget *parent = NULL) [explicit]
Constructor
Parameters:
parent Parent widget
Member Function Documentation
void QwtKnob::draw (QPainter *painter, const QRect &rect) [protected]
Repaint the knob
Parameters:
painter Painter
rect Update rectangle
void QwtKnob::drawKnob (QPainter *painter, const QRect &r) [protected]
Draw the knob. Parameters:
painter painter
r Bounding rectangle of the knob (without scale)
void QwtKnob::drawMarker (QPainter *p, doublearc, const QColor &c)
[protected]
Draw the marker at the knob's front. Parameters:
p Painter
arc Angle of the marker
c Marker color
QSize QwtKnob::minimumSizeHint () const [virtual]
Return a minimum size hint. Warning:
The return value of QwtKnob::minimumSizeHint() depends on the font
and the scale.
void QwtKnob::paintEvent (QPaintEvent *e) [protected], [virtual]
Repaint the knob
Parameters:
e Paint event
void QwtKnob::resizeEvent (QResizeEvent *e) [protected], [virtual]
Qt Resize Event
const QwtRoundScaleDraw * QwtKnob::scaleDraw () const
Returns:
the scale draw of the knob
See also:
setScaleDraw()
QwtRoundScaleDraw * QwtKnob::scaleDraw ()
Returns:
the scale draw of the knob
See also:
setScaleDraw()
void QwtKnob::setBorderWidth (intbw)
Set the knob's border width. Parameters:
bw new border width
void QwtKnob::setKnobWidth (intw)
Change the knob's width. The specified width must be >= 5, or it will
be clipped.
Parameters:
w New width
void QwtKnob::setScaleDraw (QwtRoundScaleDraw *scaleDraw)
Change the scale draw of the knob
For changing the labels of the scales, it is necessary to derive from
QwtRoundScaleDraw and overload QwtRoundScaleDraw::label().
See also:
scaleDraw()
void QwtKnob::setSymbol (QwtKnob::Symbols)
Set the symbol of the knob. See also:
symbol()
void QwtKnob::setTotalAngle (doubleangle)
Set the total angle by which the knob can be turned. Parameters:
angle Angle in degrees.
The default angle is 270 degrees. It is possible to specify an angle of
more than 360 degrees so that the knob can be turned several times
around its axis.
QSize QwtKnob::sizeHint () const [virtual]
Returns:
minimumSizeHint()
QwtKnob::Symbol QwtKnob::symbol () const
Returns:
symbol of the knob
See also:
setSymbol()Author
Generated automatically by Doxygen for Qwt User's Guide from the source
code.
Version 5.2.3 Tue Nov 20 2012 QwtKnob(3)
