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 *painter, 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

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

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:

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

See also:

setPalette(), palette()

Implemented in QwtCompassWindArrow, QwtCompassMagnetNeedle, and QwtDialSimpleNeedle.

Returns:

the palette of the needle.

Sets the palette for the needle.

Parameters:

palette New Palette

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Wed Jan 2 2019 Version 6.1.4