A class for drawing round scales. More...

#include <qwt_round_scale_draw.h>

Inheritance diagram for QwtRoundScaleDraw:

Public Member Functions
	QwtRoundScaleDraw ()
	Constructor. More...

virtual	~QwtRoundScaleDraw ()
	Destructor.

void	setRadius (double radius)

double	radius () const

void	moveCenter (double x, double y)
	Move the center of the scale draw, leaving the radius unchanged.

void	moveCenter (const QPointF &)

QPointF	center () const
	Get the center of the scale.

void	setAngleRange (double angle1, double angle2)
	Adjust the baseline circle segment for round scales. More...

virtual double	extent (const QFont &) const

Public Member Functions inherited from QwtAbstractScaleDraw
	QwtAbstractScaleDraw ()
	Constructor. More...

virtual	~QwtAbstractScaleDraw ()
	Destructor.

void	setScaleDiv (const QwtScaleDiv &s)

const QwtScaleDiv &	scaleDiv () const

void	setTransformation (QwtTransform *)

const QwtScaleMap &	scaleMap () const

QwtScaleMap &	scaleMap ()

void	enableComponent (ScaleComponent, bool enable=true)

bool	hasComponent (ScaleComponent) const

void	setTickLength (QwtScaleDiv::TickType, double length)

double	tickLength (QwtScaleDiv::TickType) const

double	maxTickLength () const

void	setSpacing (double margin)
	Set the spacing between tick and labels. More...

double	spacing () const
	Get the spacing. More...

void	setPenWidth (int width)
	Specify the width of the scale pen. More...

int	penWidth () const

virtual void	draw (QPainter *, const QPalette &) const
	Draw the scale. More...

virtual QwtText	label (double) const
	Convert a value into its representing label. More...

void	setMinimumExtent (double)
	Set a minimum for the extent. More...

double	minimumExtent () const

Protected Member Functions
virtual void	drawTick (QPainter *, double val, double len) const

virtual void	drawBackbone (QPainter *) const

virtual void	drawLabel (QPainter *, double val) const

Protected Member Functions inherited from QwtAbstractScaleDraw
void	invalidateCache ()

const QwtText &	tickLabel (const QFont &, double value) const
	Convert a value into its representing label and cache it. More...

Additional Inherited Members
Public Types inherited from QwtAbstractScaleDraw
enum	ScaleComponent { Backbone = 0x01, Ticks = 0x02, Labels = 0x04 }

typedef QFlags< ScaleComponent >	ScaleComponents
	Scale components.

Detailed Description

A class for drawing round scales.

QwtRoundScaleDraw can be used to draw round scales. The circle segment can be adjusted by setAngleRange(). The geometry of the scale can be specified with moveCenter() and setRadius().

After a scale division has been specified as a QwtScaleDiv object using QwtAbstractScaleDraw::setScaleDiv(const QwtScaleDiv &s), the scale can be drawn with the QwtAbstractScaleDraw::draw() member.

Constructor & Destructor Documentation

QwtRoundScaleDraw::QwtRoundScaleDraw ( )

Constructor.

The range of the scale is initialized to [0, 100], The center is set to (50, 50) with a radius of 50. The angle range is set to [-135, 135].

Member Function Documentation

void QwtRoundScaleDraw::drawBackbone ( QPainter * painter ) const

protectedvirtual

Draws the baseline of the scale

Parameters

painter Painter

See Also: drawTick(), drawLabel()

Implements QwtAbstractScaleDraw.

void QwtRoundScaleDraw::drawLabel	(	QPainter *	painter,
		double	value
	)		const

protectedvirtual

Draws the label for a major scale tick

Parameters

painter	Painter
value	Value

See Also: drawTick(), drawBackbone()

Implements QwtAbstractScaleDraw.

void QwtRoundScaleDraw::drawTick	(	QPainter *	painter,
		double	value,
		double	len
	)		const

protectedvirtual

Draw a tick

Parameters

painter	Painter
value	Value of the tick
len	Lenght of the tick

See Also: drawBackbone(), drawLabel()

Implements QwtAbstractScaleDraw.

double QwtRoundScaleDraw::extent ( const QFont & font ) const

virtual

Calculate the extent of the scale

The extent is the distance between the baseline to the outermost pixel of the scale draw. radius() + extent() is an upper limit for the radius of the bounding circle.

Parameters

font	Font used for painting the labels

Returns: Calculated extent

See Also: setMinimumExtent(), minimumExtent()

Warning: The implemented algorithm is not too smart and calculates only an upper limit, that might be a few pixels too large

Implements QwtAbstractScaleDraw.

void QwtRoundScaleDraw::moveCenter ( const QPointF & center )

Move the center of the scale draw, leaving the radius unchanged

Parameters

center New center

See Also: setRadius()

double QwtRoundScaleDraw::radius ( ) const

Get the radius

Radius is the radius of the backbone without ticks and labels.

Returns: Radius of the scale

See Also: setRadius(), extent()

void QwtRoundScaleDraw::setAngleRange	(	double	angle1,
		double	angle2
	)

Adjust the baseline circle segment for round scales.

The baseline will be drawn from min(angle1,angle2) to max(angle1, angle2). The default setting is [ -135, 135 ]. An angle of 0 degrees corresponds to the 12 o'clock position, and positive angles count in a clockwise direction.

Parameters

angle1
angle2	boundaries of the angle interval in degrees.

Warning

The angle range is limited to [-360, 360] degrees. Angles exceeding this range will be clipped.
For angles more or equal than 360 degrees above or below min(angle1, angle2), scale marks will not be drawn.
If you need a counterclockwise scale, use QwtScaleDiv::setInterval()

void QwtRoundScaleDraw::setRadius ( double radius )

Change of radius the scale

Radius is the radius of the backbone without ticks and labels.

Parameters

radius New Radius

See Also: moveCenter()

Public Member Functions

Protected Member Functions

Additional Inherited Members

Detailed Description

Constructor & Destructor Documentation

Member Function Documentation