QwtDialNeedle Class Reference

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

#include <qwt_dial_needle.h>

Inheritance diagram for QwtDialNeedle:

List of all members.

Public Member Functions
	QwtDialNeedle ()
	Constructor.
virtual	~QwtDialNeedle ()
	Destructor.
virtual void	draw (QPainter *painter, const QPoint &center, int length, double direction, QPalette::ColorGroup cg=QPalette::Active) const =0
virtual void	setPalette (const QPalette &)
const QPalette &	palette () const
Static Protected Member Functions
static void	drawKnob (QPainter *, const QPoint &pos, int width, const QBrush &, bool sunken)
	Draw the knob.

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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

Definition at line 31 of file qwt_dial_needle.h.

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Constructor & Destructor Documentation

QwtDialNeedle::QwtDialNeedle

(

)

Constructor.

Definition at line 25 of file qwt_dial_needle.cpp.

                            :
    d_palette(QApplication::palette())
{
}

QwtDialNeedle::~QwtDialNeedle

(

)

[virtual]

Destructor.

Definition at line 31 of file qwt_dial_needle.cpp.

{
}

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Member Function Documentation

virtual void QwtDialNeedle::draw	(	QPainter *	painter,
		const QPoint &	center,
		int	length,
		double	direction,
		QPalette::ColorGroup	cg = QPalette::Active
	)		const [pure 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
cg	Color group, used for painting

Implemented in QwtDialSimpleNeedle, QwtCompassMagnetNeedle, and QwtCompassWindArrow.

Referenced by QwtAnalogClock::drawHand(), and QwtDial::drawNeedle().

void QwtDialNeedle::drawKnob	(	QPainter *	painter,
		const QPoint &	pos,
		int	width,
		const QBrush &	brush,
		bool	sunken
	)		[static, protected]

Draw the knob.

Definition at line 54 of file qwt_dial_needle.cpp.

Referenced by QwtDialSimpleNeedle::drawArrowNeedle(), QwtDialSimpleNeedle::drawRayNeedle(), and QwtCompassMagnetNeedle::drawThinNeedle().

{
    painter->save();

    QRect rect(0, 0, width, width);
    rect.moveCenter(pos);

    painter->setPen(Qt::NoPen);
    painter->setBrush(brush);
    painter->drawEllipse(rect);

    painter->setBrush(Qt::NoBrush);

    const int colorOffset = 20;

    int startAngle = 45;
    if ( sunken )
        startAngle += 180;

    QPen pen;
    pen.setWidth(1);

    pen.setColor(brush.color().dark(100 - colorOffset));
    painter->setPen(pen);
    painter->drawArc(rect, startAngle * 16, 180 * 16);

    pen.setColor(brush.color().dark(100 + colorOffset));
    painter->setPen(pen);
    painter->drawArc(rect, (startAngle + 180) * 16, 180 * 16);

    painter->restore();
}

const QPalette & QwtDialNeedle::palette

(

)

const

Returns:

the palette of the needle.

Definition at line 48 of file qwt_dial_needle.cpp.

Referenced by QwtCompassWindArrow::draw(), QwtCompassMagnetNeedle::draw(), QwtDialSimpleNeedle::draw(), QwtCompassMagnetNeedle::QwtCompassMagnetNeedle(), QwtCompassWindArrow::QwtCompassWindArrow(), QwtDialSimpleNeedle::QwtDialSimpleNeedle(), and setPalette().

{ 
    return d_palette; 
}

void QwtDialNeedle::setPalette

(

const QPalette &

palette )

[virtual]

Sets the palette for the needle.

Parameters:

palette

New Palette

Definition at line 40 of file qwt_dial_needle.cpp.

References palette().

Referenced by QwtCompassMagnetNeedle::QwtCompassMagnetNeedle(), QwtCompassWindArrow::QwtCompassWindArrow(), and QwtDialSimpleNeedle::QwtDialSimpleNeedle().

{ 
    d_palette = palette; 
}

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The documentation for this class was generated from the following files:

• qwt_dial_needle.h
• qwt_dial_needle.cpp