QwtDialNeedle Class Reference

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

#include <qwt_dial_needle.h>

Inheritance diagram for QwtDialNeedle:

Inheritance graph
[legend]

List of all members.

Public Member Functions

virtual void draw (QPainter *painter, const QPointF &center, double length, double direction, QPalette::ColorGroup=QPalette::Active) const
const QPalette & palette () const
 QwtDialNeedle ()
virtual void setPalette (const QPalette &)
virtual ~QwtDialNeedle ()

Protected Member Functions

virtual void drawKnob (QPainter *, double width, const QBrush &, bool sunken) const
virtual void drawNeedle (QPainter *painter, double length, QPalette::ColorGroup colorGroup) const =0


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.

Qwt is missing a set of good looking needles. Contributions are very welcome.

See also:
QwtDial, QwtCompass

Constructor & Destructor Documentation

QwtDialNeedle::QwtDialNeedle (  ) 

Constructor.

QwtDialNeedle::~QwtDialNeedle (  )  [virtual]

Destructor.


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

void QwtDialNeedle::drawKnob ( QPainter *  painter,
double  width,
const QBrush &  brush,
bool  sunken 
) const [protected, virtual]

Draw the knob.

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 initilaized with translation and rotation.

Parameters:
painter Painter
length Length of the needle
colorGroup Color group, used for painting
See also:
setPalette(), palette()

Implemented in QwtDialSimpleNeedle, QwtCompassMagnetNeedle, and QwtCompassWindArrow.

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


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