Qwt User's Guide
QwtDialNeedle Class Reference

Base class for needles that can be used in a QwtDial. More...

#include <qwt_dial_needle.h>

Inheritance diagram for QwtDialNeedle:

Public Member Functions

 QwtDialNeedle ()
 Constructor.
virtual ~QwtDialNeedle ()
 Destructor.
virtual void setPalette (const QPalette &)
const QPalette & palette () const
virtual void draw (QPainter *painter, const QPointF &center, 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:
painterPainter
centerCenter of the dial, start position for the needle
lengthLength of the needle
directionDirection of the needle, in degrees counter clockwise
colorGroupColor 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:
painterPainter
lengthLength of the needle
colorGroupColor 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:
paletteNew Palette

List of all members.

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