Qwt User's Guide  6.1.3
QwtCompassMagnetNeedle Class Reference

A magnet needle for compass widgets. More...

#include <qwt_dial_needle.h>

Inheritance diagram for QwtCompassMagnetNeedle:

Public Types

enum  Style { TriangleStyle, ThinStyle }
 Style of the needle. More...

Public Member Functions

 QwtCompassMagnetNeedle (Style=TriangleStyle, const QColor &light=Qt::white, const QColor &dark=Qt::red)
- Public Member Functions inherited from QwtDialNeedle
 QwtDialNeedle ()
virtual ~QwtDialNeedle ()
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 *, double length, QPalette::ColorGroup) const
- Protected Member Functions inherited from QwtDialNeedle
virtual void drawKnob (QPainter *, double width, const QBrush &, bool sunken) const
 Draw the knob.

Detailed Description

A magnet needle for compass widgets.

A magnet needle points to two opposite directions indicating north and south.

The following colors are used:

  • QPalette::Light
    Used for pointing south
  • QPalette::Dark
    Used for pointing north
  • QPalette::Base
    Knob (ThinStyle only)
See also
QwtDial, QwtCompass

Member Enumeration Documentation

Style of the needle.


A needle with a triangular shape.


A thin needle.

Member Function Documentation

void QwtCompassMagnetNeedle::drawNeedle ( QPainter *  painter,
double  length,
QPalette::ColorGroup  colorGroup 
) const

Draw the needle

lengthLength of the needle
colorGroupColor group, used for painting

Implements QwtDialNeedle.