QwtScaleEngine类 参考

刻度引擎的基类 更多...

#include <qwt_scale_engine.h>

类 QwtScaleEngine 继承关系图:

类
class	PrivateData

Public 类型
enum	Attribute {   NoAttribute = 0x00 , IncludeReference = 0x01 , Symmetric = 0x02 , Floating = 0x04 ,   Inverted = 0x08 }
	布局属性 更多...

Public 成员函数
	QwtScaleEngine (uint base=10)
	构造函数
virtual	~QwtScaleEngine ()
	Destructor
void	setBase (uint base)
	Set the base
uint	base () const
	返回刻度引擎的基数
void	setAttribute (Attribute, bool on=true)
	Set an attribute
bool	testAttribute (Attribute) const
	测试属性是否启用
void	setAttributes (Attributes)
	Set attributes
Attributes	attributes () const
	返回刻度属性
void	setReference (double)
	Set the reference value
double	reference () const
	返回参考值
void	setMargins (double lower, double upper)
	Set the margins
double	lowerMargin () const
	返回刻度下端的边距
double	upperMargin () const
	返回刻度上端的边距
virtual void	autoScale (int maxNumSteps, double &x1, double &x2, double &stepSize) const =0
	Align and divide an interval
virtual QwtScaleDiv	divideScale (double x1, double x2, int maxMajorSteps, int maxMinorSteps, double stepSize=0.0) const =0
	Calculate a scale division
void	setTransformation (QwtTransform *)
	Set the transformation
QwtTransform *	transformation () const
	创建并返回引擎变换的克隆

Protected 成员函数
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

详细描述

刻度引擎的基类

成员枚举类型说明

Attribute

enum QwtScaleEngine::Attribute

布局属性

枚举值
NoAttribute	No attributes
IncludeReference	Build a scale which includes the reference() value
Symmetric	Build a scale which is symmetric to the reference() value
Floating	刻度的端点值 = 最外侧包含值 + 指定边距（详见 setMargins() 方法）。 若未设置此属性，刻度的端点值将为步长的整数倍。
Inverted	Turn the scale upside down

构造及析构函数说明

QwtScaleEngine()

QwtScaleEngine::QwtScaleEngine ( uint  base = 10 )

explicit

构造函数

成员函数说明

attributes()

QwtScaleEngine::Attributes QwtScaleEngine::attributes

(

)

const

返回刻度属性

返回

the attributes

autoScale()

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

pure virtual

Align and divide an interval

在 QwtDateScaleEngine, QwtLinearScaleEngine , 以及 QwtLogScaleEngine 内被实现.

base()

uint QwtScaleEngine::base

(

)

const

返回刻度引擎的基数

返回

the base

buildInterval()

QwtInterval QwtScaleEngine::buildInterval ( double  value ) const

protected

Build an interval around a value

围绕值构建区间

contains()

bool QwtScaleEngine::contains ( const QwtInterval &  interval, double  value  ) const

protected

Check if an interval contains a value

检查区间是否"包含"一个值

divideInterval()

double QwtScaleEngine::divideInterval ( double  intervalSize, int  numSteps  ) const

protected

Divide an interval

计算区间大小的步长

divideScale()

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

pure virtual

Calculate a scale division

在 QwtDateScaleEngine, QwtLinearScaleEngine , 以及 QwtLogScaleEngine 内被实现.

lowerMargin()

double QwtScaleEngine::lowerMargin

(

)

const

返回刻度下端的边距

返回

the lower margin

reference()

double QwtScaleEngine::reference

(

)

const

返回参考值

返回

the reference value

setAttribute()

void QwtScaleEngine::setAttribute	(	Attribute	attribute,
		bool	on = true
	)

Set an attribute

更改刻度属性

setAttributes()

void QwtScaleEngine::setAttributes

(

Attributes

attributes

)

Set attributes

更改刻度属性

setBase()

void QwtScaleEngine::setBase

(

uint

base

)

Set the base

设置刻度引擎的基数

setMargins()

void QwtScaleEngine::setMargins	(	double	lower,
		double	upper
	)

Set the margins

指定刻度端点的边距

setReference()

void QwtScaleEngine::setReference

(

double

reference

)

Set the reference value

指定参考点

setTransformation()

void QwtScaleEngine::setTransformation

(

QwtTransform *

transform

)

Set the transformation

设置变换

strip()

QList< double > QwtScaleEngine::strip ( const QList< double > &  ticks, const QwtInterval &  interval  ) const

protected

Strip values outside an interval

从列表中移除不在区间内的刻度

testAttribute()

bool QwtScaleEngine::testAttribute

(

Attribute

attribute

)

const

测试属性是否启用

返回

true if an attribute is set

transformation()

QwtTransform * QwtScaleEngine::transformation

(

)

const

创建并返回引擎变换的克隆

返回

the transformation

upperMargin()

double QwtScaleEngine::upperMargin

(

)

const

返回刻度上端的边距

返回

the upper margin

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该类的文档由以下文件生成:

• /home/runner/work/QWT/QWT/src/plot/qwt_scale_engine.h
• /home/runner/work/QWT/QWT/src/plot/qwt_scale_engine.cpp