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

#include <qcustomplot.h>

Inheritance diagram for QCPAxisTickerDateTime:

Collaboration diagram for QCPAxisTickerDateTime:

Public Member Functions
	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)

Public Member Functions inherited from 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)

Static Public Member Functions
static QDateTime	keyToDateTime (double key)

static double	dateTimeToKey (const QDateTime dateTime)

static double	dateTimeToKey (const QDate date)

Protected Types
enum	DateStrategy { dsNone, dsUniformTimeInDay, dsUniformDayInMonth }

Protected Member Functions
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

Protected Member Functions inherited from 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

Protected Attributes
QString	mDateTimeFormat

Qt::TimeSpec	mDateTimeSpec

enum QCPAxisTickerDateTime::DateStrategy	mDateStrategy

Protected Attributes inherited from QCPAxisTicker
TickStepStrategy	mTickStepStrategy

int	mTickCount

double	mTickOrigin

Additional Inherited Members
Public Types inherited from QCPAxisTicker
enum	TickStepStrategy { tssReadability, tssMeetTickCount }

Detailed Description

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

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:

Note: 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.

Definition at line 1572 of file qcustomplot.h.

Member Enumeration Documentation

enum QCPAxisTickerDateTime::DateStrategy

protected

Enumerator
dsNone
dsUniformTimeInDay
dsUniformDayInMonth

Definition at line 1598 of file qcustomplot.h.

Constructor & Destructor Documentation

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.

Definition at line 5775 of file qcustomplot.cpp.

Member Function Documentation

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

protectedvirtual

Reimplemented from QCPAxisTicker.

Definition at line 5933 of file qcustomplot.cpp.

QString QCPAxisTickerDateTime::dateTimeFormat ( ) const

inline

Definition at line 1578 of file qcustomplot.h.

Qt::TimeSpec QCPAxisTickerDateTime::dateTimeSpec ( ) const

inline

Definition at line 1579 of file qcustomplot.h.

double QCPAxisTickerDateTime::dateTimeToKey ( const QDateTime dateTime )

static

This is an overloaded member function, provided for convenience. It differs from the above function only in what argument(s) it accepts.

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)

See also: keyToDateTime

Definition at line 5998 of file qcustomplot.cpp.

double QCPAxisTickerDateTime::dateTimeToKey ( const QDate date )

static

This is an overloaded member function, provided for convenience. It differs from the above function only in what argument(s) it accepts.

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.

See also: keyToDateTime

Definition at line 6015 of file qcustomplot.cpp.

int QCPAxisTickerDateTime::getSubTickCount ( double tickStep )

protectedvirtual

Reimplemented from QCPAxisTicker.

Definition at line 5884 of file qcustomplot.cpp.

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

protectedvirtual

Reimplemented from QCPAxisTicker.

Definition at line 5919 of file qcustomplot.cpp.

double QCPAxisTickerDateTime::getTickStep ( const QCPRange & range )

protectedvirtual

Reimplemented from QCPAxisTicker.

Definition at line 5850 of file qcustomplot.cpp.

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)

See also: dateTimeToKey

Definition at line 5978 of file qcustomplot.cpp.

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".

See also: setDateTimeSpec

Definition at line 5791 of file qcustomplot.cpp.

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.

See also: setDateTimeFormat

Definition at line 5806 of file qcustomplot.cpp.

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.

Definition at line 5820 of file qcustomplot.cpp.

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.

Definition at line 5832 of file qcustomplot.cpp.

Member Data Documentation

enum QCPAxisTickerDateTime::DateStrategy QCPAxisTickerDateTime::mDateStrategy

protected

QString QCPAxisTickerDateTime::mDateTimeFormat

protected

Definition at line 1594 of file qcustomplot.h.

Qt::TimeSpec QCPAxisTickerDateTime::mDateTimeSpec

protected

Definition at line 1595 of file qcustomplot.h.

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

Workflow/GRAPHICS/qcustomplot.h
Workflow/GRAPHICS/qcustomplot.cpp

Public Member Functions

Static Public Member Functions

Protected Types

Protected Member Functions

Protected Attributes

Additional Inherited Members

Detailed Description

Member Enumeration Documentation

Constructor & Destructor Documentation

Member Function Documentation

Member Data Documentation