A scale engine for date/time values. More...

#include <qwt_date_scale_engine.h>

Inheritance diagram for QwtDateScaleEngine:

Classes
class	PrivateData

Public Member Functions
	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 Member Functions inherited from QwtLinearScaleEngine
	QwtLinearScaleEngine (uint base=10)
	Constructor.

virtual	~QwtLinearScaleEngine ()
	Destructor.

Public Member Functions inherited from QwtScaleEngine
	QwtScaleEngine (uint base=10)
	Constructor.

virtual	~QwtScaleEngine ()
	Destructor.

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

Protected Member Functions inherited from QwtLinearScaleEngine
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 Member Functions inherited from 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.

Additional Inherited Members
Public Types inherited from QwtScaleEngine
enum	Attribute { NoAttribute = 0x00 , IncludeReference = 0x01 , Symmetric = 0x02 , Floating = 0x04 , Inverted = 0x08 }
	Layout attributes. More...

Detailed Description

A scale engine for date/time values.

Constructor & Destructor Documentation

◆ QwtDateScaleEngine()

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

explicit

Constructor with time specification.

Constructor.

◆ ~QwtDateScaleEngine()

QwtDateScaleEngine::~QwtDateScaleEngine ( )

virtual

Destructor.

Destructor

.

Member Function Documentation

◆ 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.

Parameters

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

Returns: Aligned date/time value

◆ autoScale()

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

overridevirtual

Align and divide an interval.

Reimplemented from 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.

Reimplemented from QwtLinearScaleEngine.

◆ intervalType()

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

virtual

Classification of a date/time interval division.

◆ maxWeeks()

int QwtDateScaleEngine::maxWeeks ( ) const

Get upper limit for the number of weeks.

Get the upper limit for the number of weeks.

◆ setMaxWeeks()

void QwtDateScaleEngine::setMaxWeeks ( int weeks )

Set upper limit for the number of weeks.

Set an upper limit for the number of weeks.

◆ setTimeSpec()

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

Set the time specification used by the engine.

◆ setUtcOffset()

void QwtDateScaleEngine::setUtcOffset ( int seconds )

Set the offset in seconds from Coordinated Universal Time.

◆ setWeek0Type()

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

Set how to identify the first week of a year.

◆ timeSpec()

Qt::TimeSpec QwtDateScaleEngine::timeSpec ( ) const

Get the time specification used by the engine.

◆ toDateTime()

QDateTime QwtDateScaleEngine::toDateTime ( double value ) const

Translate a double value into a QDateTime object.

◆ utcOffset()

int QwtDateScaleEngine::utcOffset ( ) const

Get the offset in seconds from Coordinated Universal Time.

◆ week0Type()

QwtDate::Week0Type QwtDateScaleEngine::week0Type ( ) const

Get how to identify the first week of a year.

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

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

Classes

Public Member Functions

Protected Member Functions

Additional Inherited Members