Specialized axis ticker for calendar dates and times as axis ticks. Więcej...

#include <qcustomplot.hh>

Diagram dziedziczenia dla QCPAxisTickerDateTime

Diagram współpracy dla QCPAxisTickerDateTime:

Metody publiczne
	QCPAxisTickerDateTime ()

QString	dateTimeFormat () const

Qt::TimeSpec	dateTimeSpec () const

void	setDateTimeFormat (const QString &format)

void	setDateTimeSpec (Qt::TimeSpec spec)

void	setTickOrigin (double origin)

void	setTickOrigin (const QDateTime &origin)

Metody publiczne dziedziczone z QCPAxisTicker
	QCPAxisTicker ()

virtual	~QCPAxisTicker ()

TickStepStrategy	tickStepStrategy () const

int	tickCount () const

double	tickOrigin () const

void	setTickStepStrategy (TickStepStrategy strategy)

void	setTickCount (int count)

void	setTickOrigin (double origin)

virtual void	generate (const QCPRange &range, const QLocale &locale, QChar formatChar, int precision, QVector< double > &ticks, QVector< double > subTicks, QVector< QString > tickLabels)

Statyczne metody publiczne
static QDateTime	keyToDateTime (double key)

static double	dateTimeToKey (const QDateTime dateTime)

static double	dateTimeToKey (const QDate date)

Typy chronione
enum	DateStrategy { dsNone, dsUniformTimeInDay, dsUniformDayInMonth }

Metody chronione
virtual double	getTickStep (const QCPRange &range) Q_DECL_OVERRIDE

virtual int	getSubTickCount (double tickStep) Q_DECL_OVERRIDE

virtual QString	getTickLabel (double tick, const QLocale &locale, QChar formatChar, int precision) Q_DECL_OVERRIDE

virtual QVector< double >	createTickVector (double tickStep, const QCPRange &range) Q_DECL_OVERRIDE

Metody chronione dziedziczone z QCPAxisTicker
virtual QVector< double >	createSubTickVector (int subTickCount, const QVector< double > &ticks)

virtual QVector< QString >	createLabelVector (const QVector< double > &ticks, const QLocale &locale, QChar formatChar, int precision)

void	trimTicks (const QCPRange &range, QVector< double > &ticks, bool keepOneOutlier) const

double	pickClosest (double target, const QVector< double > &candidates) const

double	getMantissa (double input, double *magnitude=0) const

double	cleanMantissa (double input) const

Atrybuty chronione
QString	mDateTimeFormat

Qt::TimeSpec	mDateTimeSpec

enum QCPAxisTickerDateTime::DateStrategy	mDateStrategy

Atrybuty chronione dziedziczone z QCPAxisTicker
TickStepStrategy	mTickStepStrategy

int	mTickCount

double	mTickOrigin

Dodatkowe Dziedziczone Składowe
Typy publiczne dziedziczone z QCPAxisTicker
enum	TickStepStrategy { tssReadability, tssMeetTickCount }

Opis szczegółowy

This QCPAxisTicker subclass generates ticks that correspond to real calendar dates and times. The plot axis coordinate is interpreted as Unix Time, so seconds since Epoch (January 1, 1970, 00:00 UTC). This is also used for example by QDateTime in the toTime_t()/setTime_t() methods with a precision of one second. Since Qt 4.7, millisecond accuracy can be obtained from QDateTime by using QDateTime::fromMSecsSinceEpoch()/1000.0. The static methods dateTimeToKey and keyToDateTime conveniently perform this conversion achieving a precision of one millisecond on all Qt versions.

The format of the date/time display in the tick labels is controlled with setDateTimeFormat. If a different time spec (time zone) shall be used, see setDateTimeSpec.

This ticker produces unequal tick spacing in order to provide intuitive date and time-of-day ticks. For example, if the axis range spans a few years such that there is one tick per year, ticks will be positioned on 1. January of every year. This is intuitive but, due to leap years, will result in slightly unequal tick intervals (visually unnoticeable). The same can be seen in the image above: even though the number of days varies month by month, this ticker generates ticks on the same day of each month.

If you would like to change the date/time that is used as a (mathematical) starting date for the ticks, use the setTickOrigin(const QDateTime &origin) method overload, which takes a QDateTime. If you pass 15. July, 9:45 to this method, the yearly ticks will end up on 15. July at 9:45 of every year.

The ticker can be created and assigned to an axis like this:

Nota: If you rather wish to display relative times in terms of days, hours, minutes, seconds and milliseconds, and are not interested in the intricacies of real calendar dates with months and (leap) years, have a look at QCPAxisTickerTime instead.

Dokumentacja składowych wyliczanych

enum QCPAxisTickerDateTime::DateStrategy

protected

Wartości wyliczeń
dsNone
dsUniformTimeInDay
dsUniformDayInMonth

Dokumentacja konstruktora i destruktora

QCPAxisTickerDateTime::QCPAxisTickerDateTime ( )

Constructs the ticker and sets reasonable default values. Axis tickers are commonly created managed by a QSharedPointer, which then can be passed to QCPAxis::setTicker.

Dokumentacja funkcji składowych

QVector< double > QCPAxisTickerDateTime::createTickVector	(	double	tickStep,
		const QCPRange &	range
	)

protectedvirtual

Reimplementowana z QCPAxisTicker.

QString QCPAxisTickerDateTime::dateTimeFormat ( ) const

inline

Qt::TimeSpec QCPAxisTickerDateTime::dateTimeSpec ( ) const

inline

double QCPAxisTickerDateTime::dateTimeToKey ( const QDateTime dateTime )

static

To jest metoda przeciążona, udostępniona dla wygody. Różni się od powyższej metody tylko zestawem akceptowanych argumentów.

A convenience method which turns a QDateTime object into a double value that corresponds to seconds since Epoch (1. Jan 1970, 00:00 UTC). This is the format used as axis coordinates by QCPAxisTickerDateTime.

The accuracy achieved by this method is one millisecond, irrespective of the used Qt version (it works around the lack of a QDateTime::toMSecsSinceEpoch in Qt 4.6)

Zobacz również: keyToDateTime

double QCPAxisTickerDateTime::dateTimeToKey ( const QDate date )

static

To jest metoda przeciążona, udostępniona dla wygody. Różni się od powyższej metody tylko zestawem akceptowanych argumentów.

A convenience method which turns a QDate object into a double value that corresponds to seconds since Epoch (1. Jan 1970, 00:00 UTC). This is the format used as axis coordinates by QCPAxisTickerDateTime.

Zobacz również: keyToDateTime

int QCPAxisTickerDateTime::getSubTickCount ( double tickStep )

protectedvirtual

Reimplementowana z QCPAxisTicker.

QString QCPAxisTickerDateTime::getTickLabel	(	double	tick,
		const QLocale &	locale,
		QChar	formatChar,
		int	precision
	)

protectedvirtual

Reimplementowana z QCPAxisTicker.

double QCPAxisTickerDateTime::getTickStep ( const QCPRange & range )

protectedvirtual

Reimplementowana z QCPAxisTicker.

QDateTime QCPAxisTickerDateTime::keyToDateTime ( double key )

static

A convenience method which turns key (in seconds since Epoch 1. Jan 1970, 00:00 UTC) into a QDateTime object. This can be used to turn axis coordinates to actual QDateTimes.

The accuracy achieved by this method is one millisecond, irrespective of the used Qt version (it works around the lack of a QDateTime::fromMSecsSinceEpoch in Qt 4.6)

Zobacz również: dateTimeToKey

void QCPAxisTickerDateTime::setDateTimeFormat ( const QString & format )

Sets the format in which dates and times are displayed as tick labels. For details about the format string, see the documentation of QDateTime::toString().

Newlines can be inserted with "\n".

Zobacz również: setDateTimeSpec

void QCPAxisTickerDateTime::setDateTimeSpec ( Qt::TimeSpec spec )

Sets the time spec that is used for creating the tick labels from corresponding dates/times.

The default value of QDateTime objects (and also QCPAxisTickerDateTime) is Qt::LocalTime. However, if the date time values passed to QCustomPlot (e.g. in the form of axis ranges or keys of a plottable) are given in the UTC spec, set spec to Qt::UTC to get the correct axis labels.

Zobacz również: setDateTimeFormat

void QCPAxisTickerDateTime::setTickOrigin ( double origin )

Sets the tick origin (see QCPAxisTicker::setTickOrigin) in seconds since Epoch (1. Jan 1970, 00:00 UTC). For the date time ticker it might be more intuitive to use the overload which directly takes a QDateTime, see setTickOrigin(const QDateTime &origin).

This is useful to define the month/day/time recurring at greater tick interval steps. For example, If you pass 15. July, 9:45 to this method and the tick interval happens to be one tick per year, the ticks will end up on 15. July at 9:45 of every year.

void QCPAxisTickerDateTime::setTickOrigin ( const QDateTime & origin )

Sets the tick origin (see QCPAxisTicker::setTickOrigin) as a QDateTime origin.

This is useful to define the month/day/time recurring at greater tick interval steps. For example, If you pass 15. July, 9:45 to this method and the tick interval happens to be one tick per year, the ticks will end up on 15. July at 9:45 of every year.

Dokumentacja atrybutów składowych

enum QCPAxisTickerDateTime::DateStrategy QCPAxisTickerDateTime::mDateStrategy

protected

QString QCPAxisTickerDateTime::mDateTimeFormat

protected

Qt::TimeSpec QCPAxisTickerDateTime::mDateTimeSpec

protected

Dokumentacja dla tej klasy została wygenerowana z plików:

Metody publiczne

Statyczne metody publiczne

Typy chronione

Metody chronione

Atrybuty chronione

Dodatkowe Dziedziczone Składowe

Opis szczegółowy

Dokumentacja składowych wyliczanych

Dokumentacja konstruktora i destruktora

Dokumentacja funkcji składowych

Dokumentacja atrybutów składowych