QwtCompassMagnetNeedle(3) Qwt User's Guide QwtCompassMagnetNeedle(3)

QwtCompassMagnetNeedle - A magnet needle for compass widgets.

#include <qwt_dial_needle.h>

Inherits QwtDialNeedle.

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

QwtCompassMagnetNeedle (Style=TriangleStyle, const QColor &light=Qt::white, const QColor &dark=Qt::red)

virtual void drawNeedle (QPainter *, double length, QPalette::ColorGroup) const override

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

Definition at line 127 of file qwt_dial_needle.h.

Style of the needle.


A needle with a triangular shape.
A thin needle.

Definition at line 131 of file qwt_dial_needle.h.

Draw the needle


painter Painter
length Length of the needle
colorGroup Color group, used for painting

Implements QwtDialNeedle.

Definition at line 369 of file qwt_dial_needle.cpp.

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Sun Jul 18 2021 Version 6.2.0