A class for drawing round scales. More...

#include <qwt_round_scale_draw.h>

Inheritance diagram for QwtRoundScaleDraw:

Classes
class	PrivateData

Public Member Functions
	QwtRoundScaleDraw ()
	Constructor.

	~QwtRoundScaleDraw () override
	Destructor.

void	setRadius (double radius)
	Set the radius.

double	radius () const
	Get the radius.

void	moveCenter (double x, double y)
	Move the center.

void	moveCenter (const QPointF &)
	Move the center.

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

void	setAngleRange (double angle1, double angle2)
	Set the angle range.

virtual double	extent (const QFont &) const override
	Calculate the extent of the scale.

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

void	setScaleDiv (const QwtScaleDiv &)
	Set the scale division.

const QwtScaleDiv &	scaleDiv () const
	Return the scale division.

void	setTransformation (QwtTransform *)
	Set the scale transformation.

const QwtScaleMap &	scaleMap () const
	Return the scale map (const version)

QwtScaleMap &	scaleMap ()
	Return the scale map (non-const version)

void	enableComponent (ScaleComponent, bool enable=true)
	Enable or disable a scale component.

bool	hasComponent (ScaleComponent) const
	Check if a component is enabled.

void	setTickLength (QwtScaleDiv::TickType, double length)
	Set the length of the ticks.

double	tickLength (QwtScaleDiv::TickType) const
	Get the length of the ticks.

double	maxTickLength () const
	Get the length of the longest tick.

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

double	spacing () const
	Get the spacing.

void	setPenWidthF (qreal width)
	Specify the width of the scale pen.

qreal	penWidthF () const
	Get the scale pen width.

void	setSelected (bool on)
	Set whether the scale draw is selected.

bool	isSelected () const
	Check if the scale draw is selected.

void	setSelectedPenWidthOffset (qreal offset=1)
	Set the pen width offset for the axis when it is in selected state.

qreal	selectedPenWidthOffset () const
	Get the current pen width offset for the axis when it is in selected state.

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

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

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

double	minimumExtent () const
	Get the minimum extent.

void	invalidateCache ()
	Invalidate the cache used by tickLabel()

Protected Member Functions
virtual void	drawTick (QPainter *, double value, double len) const override
	Draw a tick.

virtual void	drawBackbone (QPainter *) const override
	Draws the baseline of the scale.

virtual void	drawLabel (QPainter *, double value) const override
	Draws the label for a major scale tick.

Protected Member Functions inherited from QwtAbstractScaleDraw
const QwtText &	tickLabel (const QFont &, double value) const
	Convert a value into its representing label and cache it.

Additional Inherited Members
Public Types inherited from QwtAbstractScaleDraw
enum	ScaleComponent { Backbone = 0x01 , Ticks = 0x02 , Labels = 0x04 }
	Components of a scale. More...

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::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

◆ center()

QPointF QwtRoundScaleDraw::center ( ) const

Get the center of the scale.

Returns: the center; Center point of the scale

See also: moveCenter()

◆ drawBackbone()

void QwtRoundScaleDraw::drawBackbone ( QPainter * painter ) const

overrideprotectedvirtual

Draws the baseline of the scale.

Parameters

painter Painter

See also: drawTick(), drawLabel()

Implements QwtAbstractScaleDraw.

◆ drawLabel()

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

overrideprotectedvirtual

Draws the label for a major scale tick.

Parameters

painter	Painter
value	Value

See also: drawTick(), drawBackbone()

Implements QwtAbstractScaleDraw.

◆ drawTick()

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

overrideprotectedvirtual

Draw a tick.

Parameters

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

See also: drawBackbone(), drawLabel()

Implements QwtAbstractScaleDraw.

◆ extent()

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

overridevirtual

Calculate the extent of the scale.

Parameters

font	Font used for painting the labels

Returns: Calculated extent

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.

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

See also: setMinimumExtent(), minimumExtent()

Implements QwtAbstractScaleDraw.

◆ moveCenter() [1/2]

void QwtRoundScaleDraw::moveCenter ( const QPointF & center )

Move the center.

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

Parameters

center New center

See also: setRadius()

◆ moveCenter() [2/2]

void QwtRoundScaleDraw::moveCenter	(	double	x,
		double	y
	)

inline

Move the center.

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

◆ radius()

double QwtRoundScaleDraw::radius ( ) const

Get the radius.

Returns: the radius; Radius of the scale

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

See also: setRadius(), extent()

◆ setAngleRange()

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

Set the angle range.

Adjust the baseline circle segment for round scales.

Parameters

angle1	First boundary of the angle interval in degrees
angle2	Second boundary of the angle interval in degrees

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.

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()

◆ setRadius()

void QwtRoundScaleDraw::setRadius ( double radius )

Set the radius.

Change the radius of the scale.

Parameters

radius New radius

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

See also: moveCenter()

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

/home/runner/work/QWT/QWT/src/plot/qwt_round_scale_draw.h
/home/runner/work/QWT/QWT/src/plot/qwt_round_scale_draw.cpp

Classes

Public Member Functions

Protected Member Functions

Additional Inherited Members

Detailed Description

Constructor & Destructor Documentation

◆ QwtRoundScaleDraw()

Member Function Documentation

◆ center()

◆ drawBackbone()

◆ drawLabel()

◆ drawTick()

◆ extent()

◆ moveCenter() [1/2]

◆ moveCenter() [2/2]

◆ radius()

◆ setAngleRange()

◆ setRadius()