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

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

#include <qwt_dial_needle.h>

Inherited by QwtCompassMagnetNeedle, QwtCompassWindArrow, and QwtDialSimpleNeedle.

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

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.

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

Definition at line 27 of file qwt_dial_needle.h.

Draw the needle


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

Definition at line 219 of file qwt_dial_needle.cpp.

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.


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

See also

setPalette(), palette()

Implemented in QwtCompassWindArrow, QwtCompassMagnetNeedle, and QwtDialSimpleNeedle.


the palette of the needle.

Definition at line 205 of file qwt_dial_needle.cpp.

Sets the palette for the needle.


palette New Palette

Definition at line 197 of file qwt_dial_needle.cpp.

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