A scale engine for logarithmic scales 更多...

#include <qwt_scale_engine.h>

类 QwtLogScaleEngine 继承关系图:

Public 成员函数
	QwtLogScaleEngine (uint base=10)
	Constructor

	~QwtLogScaleEngine () override
	Destructor

virtual void	autoScale (int maxNumSteps, double &x1, double &x2, double &stepSize) const override
	Align and divide an interval

virtual QwtScaleDiv	divideScale (double x1, double x2, int maxMajorSteps, int maxMinorSteps, double stepSize=0.0) const override
	Calculate a scale division for an interval

Public 成员函数继承自 QwtScaleEngine
	QwtScaleEngine (uint base=10)
	Constructor

void	setBase (uint base)
	Set the base

uint	base () const
	Return base of the scale engine

void	setAttribute (Attribute, bool on=true)
	Set an attribute

bool	testAttribute (Attribute) const
	Test if an attribute is enabled

void	setAttributes (Attributes)
	Set attributes

Attributes	attributes () const
	Return scale attributes

void	setReference (double)
	Set the reference value

double	reference () const
	Return the reference value

void	setMargins (double lower, double upper)
	Set the margins

double	lowerMargin () const
	Return the margin at the lower end of the scale

double	upperMargin () const
	Return the margin at the upper end of the scale

void	setTransformation (QwtTransform *)
	Set the transformation

QwtTransform *	transformation () const
	Create and return a clone of the transformation of the engine

Protected 成员函数
QwtInterval	align (const QwtInterval &, double stepSize) const
	Align an interval to a step size

void	buildTicks (const QwtInterval &, double stepSize, int maxMinorSteps, QList< double > ticks[QwtScaleDiv::NTickTypes]) const
	Calculate ticks for an interval

QList< double >	buildMajorTicks (const QwtInterval &interval, double stepSize) const
	Calculate major ticks for an interval

void	buildMinorTicks (const QList< double > &majorTicks, int maxMinorSteps, double stepSize, QList< double > &minorTicks, QList< double > &mediumTicks) const
	Calculate minor/medium ticks for major ticks

Protected 成员函数继承自 QwtScaleEngine
bool	contains (const QwtInterval &, double value) const
	Check if an interval contains a value

QList< double >	strip (const QList< double > &, const QwtInterval &) const
	Strip values outside an interval

double	divideInterval (double intervalSize, int numSteps) const
	Divide an interval

QwtInterval	buildInterval (double value) const
	Build an interval around a value

额外继承的成员函数
Public 类型继承自 QwtScaleEngine
enum	Attribute { NoAttribute = 0x00 , IncludeReference = 0x01 , Symmetric = 0x02 , Floating = 0x04 , Inverted = 0x08 }
	Layout attributes 更多...

详细描述

A scale engine for logarithmic scales

The step size is measured in decades and the major step size will be adjusted to fit the pattern $\left\{ 1,2,3,5\right\} \cdot 10^{n}$ , where n is a natural number including zero.

警告: The step size as well as the margins are measured in decades.

构造及析构函数说明

◆ QwtLogScaleEngine()

QwtLogScaleEngine::QwtLogScaleEngine ( uint base = 10 )

explicit

Constructor

参数

base	Base of the scale engine

参见: setBase()

成员函数说明

◆ align()

QwtInterval QwtLogScaleEngine::align	(	const QwtInterval &	interval,
		double	stepSize
	)		const

protected

Align an interval to a step size

参数

interval	Interval
stepSize	Step size

返回: Aligned interval

◆ autoScale()

void QwtLogScaleEngine::autoScale	(	int	maxNumSteps,
		double &	x1,
		double &	x2,
		double &	stepSize
	)		const

overridevirtual

Align and divide an interval

参数

maxNumSteps	Max. number of steps
x1	First limit of the interval (In/Out)
x2	Second limit of the interval (In/Out)
stepSize	Step size (Out)

参见: QwtScaleEngine::setAttribute()

实现了 QwtScaleEngine.

◆ buildMajorTicks()

QList< double > QwtLogScaleEngine::buildMajorTicks	(	const QwtInterval &	interval,
		double	stepSize
	)		const

protected

Calculate major ticks for an interval

参数

interval	Interval
stepSize	Step size

返回: Calculated ticks

◆ buildMinorTicks()

void QwtLogScaleEngine::buildMinorTicks	(	const QList< double > &	majorTicks,
		int	maxMinorSteps,
		double	stepSize,
		QList< double > &	minorTicks,
		QList< double > &	mediumTicks
	)		const

protected

Calculate minor/medium ticks for major ticks

参数

majorTicks	Major ticks
maxMinorSteps	Maximum number of minor steps
stepSize	Step size
minorTicks	Array to be filled with the calculated minor ticks
mediumTicks	Array to be filled with the calculated medium ticks

◆ buildTicks()

void QwtLogScaleEngine::buildTicks	(	const QwtInterval &	interval,
		double	stepSize,
		int	maxMinorSteps,
		QList< double >	ticks[QwtScaleDiv::NTickTypes]
	)		const

protected

Calculate ticks for an interval

参数

interval	Interval
stepSize	Step size
maxMinorSteps	Maximum number of minor steps
ticks	Arrays to be filled with the calculated ticks

参见: buildMajorTicks(), buildMinorTicks()

◆ divideScale()

QwtScaleDiv QwtLogScaleEngine::divideScale	(	double	x1,
		double	x2,
		int	maxMajorSteps,
		int	maxMinorSteps,
		double	stepSize = `0.0`
	)		const

overridevirtual

Calculate a scale division for an interval

参数

x1	First interval limit
x2	Second interval limit
maxMajorSteps	Maximum for the number of major steps
maxMinorSteps	Maximum number of minor steps
stepSize	Step size. If stepSize == 0, the engine calculates one.

返回: Calculated scale division

实现了 QwtScaleEngine.

该类的文档由以下文件生成:

/home/runner/work/QWT/QWT/src/core/qwt_scale_engine.h
/home/runner/work/QWT/QWT/src/core/qwt_scale_engine.cpp

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

◆ QwtLogScaleEngine()

成员函数说明

◆ align()

◆ autoScale()

◆ buildMajorTicks()

◆ buildMinorTicks()

◆ buildTicks()

◆ divideScale()