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.

virtual	~QwtRoundScaleDraw ()
	Destructor.

void	setRadius (double radius)
	Change of radius the scale.

double	radius () const
	Get the radius.

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

void	moveCenter (const QPointF &)
	Move the center of the scale draw, leaving the radius unchanged.

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

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

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

Public Member Functions inherited from QwtAbstractScaleDraw
	QwtAbstractScaleDraw ()
	Constructor.

virtual	~QwtAbstractScaleDraw ()
	Destructor.

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

const QwtScaleDiv &	scaleDiv () const

void	setTransformation (QwtTransform *)
	Change the transformation of the scale.

const QwtScaleMap &	scaleMap () const

QwtScaleMap &	scaleMap ()

void	enableComponent (ScaleComponent, bool enable=true)
	En/Disable a component of the scale.

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

double	maxTickLength () const

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

void	setSelected (bool on)
	设置是否选中

bool	isSelected () const
	是否选中

void	setSelectedPenWidthOffset (qreal offset=1)
	设置坐标轴在选中状态下的画笔宽度附加值

qreal	selectedPenWidthOffset () const
	获取当前坐标轴在选中状态下的画笔宽度附加值

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 QWT_OVERRIDE
	Draw a tick.

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

virtual void	drawLabel (QPainter *, double value) const QWT_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

◆ drawBackbone()

void QwtRoundScaleDraw::drawBackbone ( QPainter * painter ) const

protectedvirtual

Draws the baseline of the scale.

Parameters

painter Painter

See also: drawTick(), drawLabel()

Implements QwtAbstractScaleDraw.

◆ drawLabel()

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.

◆ drawTick()

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

protectedvirtual

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

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.

◆ moveCenter()

void QwtRoundScaleDraw::moveCenter ( const QPointF & center )

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

Parameters

center New center

See also: setRadius()

◆ radius()

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()

◆ setAngleRange()

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()

◆ setRadius()

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()

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

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

Classes

Public Member Functions

Protected Member Functions

Additional Inherited Members

Detailed Description

Constructor & Destructor Documentation

◆ QwtRoundScaleDraw()

Member Function Documentation

◆ drawBackbone()

◆ drawLabel()

◆ drawTick()

◆ extent()

◆ moveCenter()

◆ radius()

◆ setAngleRange()

◆ setRadius()