A class for drawing round scales 更多...

#include <qwt_round_scale_draw.h>

类 QwtRoundScaleDraw 继承关系图:

类
class	PrivateData

Public 成员函数
	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 成员函数继承自 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 成员函数
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 成员函数继承自 QwtAbstractScaleDraw
const QwtText &	tickLabel (const QFont &, double value) const
	Convert a value into its representing label and cache it

额外继承的成员函数
Public 类型继承自 QwtAbstractScaleDraw
enum	ScaleComponent { Backbone = 0x01 , Ticks = 0x02 , Labels = 0x04 }
	Components of a scale 更多...

详细描述

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.

构造及析构函数说明

◆ 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].

成员函数说明

◆ center()

QPointF QwtRoundScaleDraw::center ( ) const

Get the center of the scale

返回: the center; Center point of the scale

参见: moveCenter()

◆ drawBackbone()

void QwtRoundScaleDraw::drawBackbone ( QPainter * painter ) const

overrideprotectedvirtual

Draws the baseline of the scale

参数

painter Painter

参见: drawTick(), drawLabel()

实现了 QwtAbstractScaleDraw.

◆ drawLabel()

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

overrideprotectedvirtual

Draws the label for a major scale tick

参数

painter	Painter
value	Value

参见: drawTick(), drawBackbone()

实现了 QwtAbstractScaleDraw.

◆ drawTick()

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

overrideprotectedvirtual

Draw a tick

参数

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

参见: drawBackbone(), drawLabel()

实现了 QwtAbstractScaleDraw.

◆ extent()

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

overridevirtual

Calculate the extent of the scale

参数

font	Font used for painting the labels

返回: 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.

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

参见: setMinimumExtent(), minimumExtent()

实现了 QwtAbstractScaleDraw.

◆ moveCenter() [1/2]

void QwtRoundScaleDraw::moveCenter ( const QPointF & center )

Move the center

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

参数

center New center

参见: 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

返回: the radius; Radius of the scale

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

参见: setRadius(), extent()

◆ setAngleRange()

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

Set the angle range

Adjust the baseline circle segment for round scales

参数

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.

警告

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

参数

radius New radius

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

参见: moveCenter()

该类的文档由以下文件生成:

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

类

Public 成员函数

Protected 成员函数

额外继承的成员函数

详细描述

构造及析构函数说明

◆ QwtRoundScaleDraw()

成员函数说明

◆ center()

◆ drawBackbone()

◆ drawLabel()

◆ drawTick()

◆ extent()

◆ moveCenter() [1/2]

◆ moveCenter() [2/2]

◆ radius()

◆ setAngleRange()

◆ setRadius()