用于日期/时间值的刻度引擎更多...

#include <qwt_date_scale_engine.h>

类 QwtDateScaleEngine 继承关系图:

类
class	PrivateData

Public 成员函数
	QwtDateScaleEngine (Qt::TimeSpec=Qt::LocalTime)
	Constructor with time specification

virtual	~QwtDateScaleEngine ()
	Destructor

void	setTimeSpec (Qt::TimeSpec)
	Set the time specification used by the engine

Qt::TimeSpec	timeSpec () const
	Get the time specification used by the engine

void	setUtcOffset (int seconds)
	Set the offset in seconds from Coordinated Universal Time

int	utcOffset () const
	Get the offset in seconds from Coordinated Universal Time

void	setWeek0Type (QwtDate::Week0Type)
	Set how to identify the first week of a year

QwtDate::Week0Type	week0Type () const
	Get how to identify the first week of a year

void	setMaxWeeks (int)
	Set upper limit for the number of weeks

int	maxWeeks () const
	Get upper limit for the number of weeks

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 a date/time interval

virtual QwtDate::IntervalType	intervalType (const QDateTime &, const QDateTime &, int maxSteps) const
	Classification of a date/time interval division

QDateTime	toDateTime (double) const
	Translate a double value into a QDateTime object

Public 成员函数继承自 QwtLinearScaleEngine
	QwtLinearScaleEngine (uint base=10)
	构造函数

virtual	~QwtLinearScaleEngine ()
	Destructor

Public 成员函数继承自 QwtScaleEngine
	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

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
virtual QDateTime	alignDate (const QDateTime &, double stepSize, QwtDate::IntervalType, bool up) const
	Align a date/time value for a step size

Protected 成员函数继承自 QwtLinearScaleEngine
QwtInterval	align (const QwtInterval &, double stepSize) const
	将区间对齐到步长

void	buildTicks (const QwtInterval &, double stepSize, int maxMinorSteps, QList< double > ticks[QwtScaleDiv::NTickTypes]) const
	计算区间的刻度

QList< double >	buildMajorTicks (const QwtInterval &interval, double stepSize) const
	计算区间的主刻度

void	buildMinorTicks (const QList< double > &majorTicks, int maxMinorSteps, double stepSize, QList< double > &minorTicks, QList< double > &mediumTicks) const
	计算主刻度的次刻度/中刻度

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 }
	布局属性更多...

详细描述

用于日期/时间值的刻度引擎

构造及析构函数说明

◆ QwtDateScaleEngine()

QwtDateScaleEngine::QwtDateScaleEngine ( Qt::TimeSpec timeSpec = Qt::LocalTime )

explicit

Constructor with time specification

构造函数

◆ ~QwtDateScaleEngine()

QwtDateScaleEngine::~QwtDateScaleEngine ( )

virtual

Destructor

析构函数

成员函数说明

◆ alignDate()

QDateTime QwtDateScaleEngine::alignDate	(	const QDateTime &	dateTime,
		double	stepSize,
		QwtDate::IntervalType	intervalType,
		bool	up
	)		const

protectedvirtual

Align a date/time value for a step size

For Qt::Day alignments there is no "natural day 0" - instead the first day of the year is used to avoid jumping major ticks positions when panning a scale. For other alignments ( f.e according to the first day of the month ) alignDate() has to be overloaded.

参数

dateTime	Date/time value
stepSize	Step size
intervalType	Interval type
up	When true dateTime is ceiled - otherwise it is floored

返回: Aligned date/time value

◆ autoScale()

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

overridevirtual

Align and divide an interval

对齐并划分间隔

重载 QwtLinearScaleEngine .

◆ divideScale()

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

overridevirtual

Calculate a scale division for a date/time interval

计算日期/时间间隔的刻度划分

重载 QwtLinearScaleEngine .

◆ intervalType()

QwtDate::IntervalType QwtDateScaleEngine::intervalType	(	const QDateTime &	minDate,
		const QDateTime &	maxDate,
		int	maxSteps
	)		const

virtual

Classification of a date/time interval division

日期/时间间隔划分的分类

◆ maxWeeks()

int QwtDateScaleEngine::maxWeeks ( ) const

Get upper limit for the number of weeks

获取周数的上限

◆ setMaxWeeks()

void QwtDateScaleEngine::setMaxWeeks ( int weeks )

Set upper limit for the number of weeks

设置周数的上限

◆ setTimeSpec()

void QwtDateScaleEngine::setTimeSpec ( Qt::TimeSpec timeSpec )

Set the time specification used by the engine

设置引擎使用的时间规范

◆ setUtcOffset()

void QwtDateScaleEngine::setUtcOffset ( int seconds )

Set the offset in seconds from Coordinated Universal Time

设置与世界协调时间的偏移量（秒）

◆ setWeek0Type()

void QwtDateScaleEngine::setWeek0Type ( QwtDate::Week0Type week0Type )

Set how to identify the first week of a year

设置如何确定一年的第一周

◆ timeSpec()

Qt::TimeSpec QwtDateScaleEngine::timeSpec ( ) const

Get the time specification used by the engine

获取引擎使用的时间规范

◆ toDateTime()

QDateTime QwtDateScaleEngine::toDateTime ( double value ) const

Translate a double value into a QDateTime object

将 double 值转换为 QDateTime 对象

◆ utcOffset()

int QwtDateScaleEngine::utcOffset ( ) const

Get the offset in seconds from Coordinated Universal Time

获取与世界协调时间的偏移量（秒）

◆ week0Type()

QwtDate::Week0Type QwtDateScaleEngine::week0Type ( ) const

Get how to identify the first week of a year

获取如何确定一年的第一周

该类的文档由以下文件生成:

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

类

Public 成员函数

Protected 成员函数

额外继承的成员函数