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QCPAxisTickerTime Class Reference

Specialized axis ticker for time spans in units of milliseconds to days. More...

Inheritance diagram for QCPAxisTickerTime:
Inheritance graph

Public Types

enum  TimeUnit
- Public Types inherited from QCPAxisTicker
enum  TickStepStrategy

Public Functions

 QCPAxisTickerTime ()
QString timeFormat () const
int fieldWidth (TimeUnit unit) const
void setTimeFormat (const QString &format)
void setFieldWidth (TimeUnit unit, int width)
- Public Functions inherited from QCPAxisTicker
 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)

Protected Functions

virtual double getTickStep (const QCPRange &range)
virtual int getSubTickCount (double tickStep)
virtual QString getTickLabel (double tick, const QLocale &locale, QChar formatChar, int precision)
void replaceUnit (QString &text, TimeUnit unit, int value) const
- Protected Functions inherited from QCPAxisTicker
virtual QVector< double > createTickVector (double tickStep, const QCPRange &range)
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=nullptr) const
double cleanMantissa (double input) const

Detailed Description

Specialized axis ticker for time spans in units of milliseconds to days.


This QCPAxisTicker subclass generates ticks that corresponds to time intervals.

The format of the time display in the tick labels is controlled with setTimeFormat and setFieldWidth. The time coordinate is in the unit of seconds with respect to the time coordinate zero. Unlike with QCPAxisTickerDateTime, the ticks don't correspond to a specific calendar date and time.

The time can be displayed in milliseconds, seconds, minutes, hours and days. Depending on the largest available unit in the format specified with setTimeFormat, any time spans above will be carried in that largest unit. So for example if the format string is "%m:%s" and a tick at coordinate value 7815 (being 2 hours, 10 minutes and 15 seconds) is created, the resulting tick label will show "130:15" (130 minutes, 15 seconds). If the format string is "%h:%m:%s", the hour unit will be used and the label will thus be "02:10:15". Negative times with respect to the axis zero will carry a leading minus sign.

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

QSharedPointer<QCPAxisTickerTime> timeTicker(new QCPAxisTickerTime);
customPlot->xAxis->setRange(-60*3.5, 60*11);

Here is an example of a time axis providing time information in days, hours and minutes. Due to the axis range spanning a few days and the wanted tick count (setTickCount), the ticker decided to use tick steps of 12 hours:


The format string for this example is

timeTicker->setTimeFormat("day %d\n%h:%m");
If you rather wish to display calendar dates and times, have a look at QCPAxisTickerDateTime instead.

Member Enumeration Documentation

§ TimeUnit

Defines the logical units in which fractions of time spans can be expressed.

See also
setFieldWidth, setTimeFormat

Milliseconds, one thousandth of a second (%z in setTimeFormat)


Seconds (%s in setTimeFormat)


Minutes (%m in setTimeFormat)


Hours (%h in setTimeFormat)


Days (%d in setTimeFormat)

Constructor & Destructor Documentation

§ QCPAxisTickerTime()

QCPAxisTickerTime::QCPAxisTickerTime ( )

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.

Member Function Documentation

§ setTimeFormat()

void QCPAxisTickerTime::setTimeFormat ( const QString &  format)

Sets the format that will be used to display time in the tick labels.

The available patterns are:

  • %z for milliseconds
  • %s for seconds
  • %m for minutes
  • %h for hours
  • %d for days

The field width (zero padding) can be controlled for each unit with setFieldWidth.

The largest unit that appears in format will carry all the remaining time of a certain tick coordinate, even if it overflows the natural limit of the unit. For example, if %m is the largest unit it might become larger than 59 in order to consume larger time values. If on the other hand %h is available, the minutes will wrap around to zero after 59 and the time will carry to the hour digit.

§ setFieldWidth()

void QCPAxisTickerTime::setFieldWidth ( QCPAxisTickerTime::TimeUnit  unit,
int  width 

Sets the field widh of the specified unit to be width digits, when displayed in the tick label. If the number for the specific unit is shorter than width, it will be padded with an according number of zeros to the left in order to reach the field width.

See also

§ getTickStep()

double QCPAxisTickerTime::getTickStep ( const QCPRange range)

Returns the tick step appropriate for time displays, depending on the provided range and the smallest available time unit in the current format (setTimeFormat). For example if the unit of seconds isn't available in the format, this method will not generate steps (like 2.5 minutes) that require sub-minute precision to be displayed correctly.

For general information about this virtual method, see the base class implementation.

Reimplemented from QCPAxisTicker.

§ getSubTickCount()

int QCPAxisTickerTime::getSubTickCount ( double  tickStep)

Returns the sub tick count appropriate for the provided tickStep and time displays.

For general information about this virtual method, see the base class implementation.

Reimplemented from QCPAxisTicker.

§ getTickLabel()

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

Returns the tick label corresponding to the provided tick and the configured format and field widths (setTimeFormat, setFieldWidth).

For general information about this virtual method, see the base class implementation.

Reimplemented from QCPAxisTicker.

§ replaceUnit()

void QCPAxisTickerTime::replaceUnit ( QString &  text,
QCPAxisTickerTime::TimeUnit  unit,
int  value 
) const

Replaces all occurrences of the format pattern belonging to unit in text with the specified value, using the field width as specified with setFieldWidth for the unit.

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