QwtDialNeedle - Man Page
Base class for needles that can be used in a QwtDial.
Synopsis
#include <qwt_dial_needle.h>
Inherited by QwtCompassMagnetNeedle, QwtCompassWindArrow, and QwtDialSimpleNeedle.
Public Member Functions
QwtDialNeedle ()
Constructor.
virtual ~QwtDialNeedle ()
Destructor.
virtual void setPalette (const QPalette &)
const QPalette & palette () const
virtual void draw (QPainter *painter, const QPointF ¢er, double length, double direction, QPalette::ColorGroup=QPalette::Active) const
Protected Member Functions
virtual void drawNeedle (QPainter *painter, double length, QPalette::ColorGroup colorGroup) const =0
Draw the needle.
virtual void drawKnob (QPainter *, double width, const QBrush &, bool sunken) const
Draw the knob.
Detailed Description
Base class for needles that can be used in a QwtDial.
QwtDialNeedle is a pointer that indicates a value by pointing to a specific direction.
- See also
QwtDial, QwtCompass
Member Function Documentation
void QwtDialNeedle::draw (QPainter * painter, const QPointF & center, double length, double direction, QPalette::ColorGroup colorGroup = QPalette::Active) const [virtual]
Draw the needle
- Parameters
painter Painter
center Center of the dial, start position for the needle
length Length of the needle
direction Direction of the needle, in degrees counter clockwise
colorGroup Color group, used for painting
virtual void QwtDialNeedle::drawNeedle (QPainter * painter, double length, QPalette::ColorGroup colorGroup) const [protected], [pure virtual]
Draw the needle. The origin of the needle is at position (0.0, 0.0 ) pointing in direction 0.0 ( = east ).
The painter is already initialized with translation and rotation.
- Parameters
painter Painter
length Length of the needle
colorGroup Color group, used for painting- See also
setPalette(), palette()
Implemented in QwtCompassWindArrow, QwtCompassMagnetNeedle, and QwtDialSimpleNeedle.
const QPalette & QwtDialNeedle::palette () const
- Returns
the palette of the needle.
void QwtDialNeedle::setPalette (const QPalette & palette) [virtual]
Sets the palette for the needle.
- Parameters
palette New Palette
Author
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