.TH "QwtDateScaleDraw" 3 "Mon Dec 28 2020" "Version 6.1.6" "Qwt User's Guide" \" -*- nroff -*- .ad l .nh .SH NAME QwtDateScaleDraw \- A class for drawing datetime scales\&. .SH SYNOPSIS .br .PP .PP \fC#include \fP .PP Inherits \fBQwtScaleDraw\fP\&. .SS "Public Member Functions" .in +1c .ti -1c .RI "\fBQwtDateScaleDraw\fP (Qt::TimeSpec=Qt::LocalTime)" .br .RI "Constructor\&. " .ti -1c .RI "virtual \fB~QwtDateScaleDraw\fP ()" .br .RI "Destructor\&. " .ti -1c .RI "void \fBsetDateFormat\fP (\fBQwtDate::IntervalType\fP, const QString &)" .br .ti -1c .RI "QString \fBdateFormat\fP (\fBQwtDate::IntervalType\fP) const" .br .ti -1c .RI "void \fBsetTimeSpec\fP (Qt::TimeSpec)" .br .ti -1c .RI "Qt::TimeSpec \fBtimeSpec\fP () const" .br .ti -1c .RI "void \fBsetUtcOffset\fP (int seconds)" .br .ti -1c .RI "int \fButcOffset\fP () const" .br .ti -1c .RI "void \fBsetWeek0Type\fP (\fBQwtDate::Week0Type\fP)" .br .ti -1c .RI "\fBQwtDate::Week0Type\fP \fBweek0Type\fP () const" .br .ti -1c .RI "virtual \fBQwtText\fP \fBlabel\fP (double) const" .br .RI "Convert a value into its representing label\&. " .ti -1c .RI "QDateTime \fBtoDateTime\fP (double) const" .br .in -1c .SS "Protected Member Functions" .in +1c .ti -1c .RI "virtual \fBQwtDate::IntervalType\fP \fBintervalType\fP (const \fBQwtScaleDiv\fP &) const" .br .ti -1c .RI "virtual QString \fBdateFormatOfDate\fP (const QDateTime &, \fBQwtDate::IntervalType\fP) const" .br .in -1c .SS "Additional Inherited Members" .SH "Detailed Description" .PP A class for drawing datetime scales\&. \fBQwtDateScaleDraw\fP displays values as datetime labels\&. The format of the labels depends on the alignment of the major tick labels\&. .PP The default format strings are: .PP .IP "\(bu" 2 Millisecond .br 'hh:mm:ss:zzz\\nddd dd MMM yyyy' .IP "\(bu" 2 Second .br 'hh:mm:ss\\nddd dd MMM yyyy' .IP "\(bu" 2 Minute .br 'hh:mm\\nddd dd MMM yyyy' .IP "\(bu" 2 Hour .br 'hh:mm\\nddd dd MMM yyyy' .IP "\(bu" 2 Day .br 'ddd dd MMM yyyy' .IP "\(bu" 2 Week .br 'Www yyyy' .IP "\(bu" 2 Month .br 'MMM yyyy' .IP "\(bu" 2 Year .br 'yyyy' .PP .PP The format strings can be modified using \fBsetDateFormat()\fP or individually for each tick label by overloading \fBdateFormatOfDate()\fP, .PP Usually \fBQwtDateScaleDraw\fP is used in combination with \fBQwtDateScaleEngine\fP, that calculates scales for datetime intervals\&. .PP \fBSee also\fP .RS 4 \fBQwtDateScaleEngine\fP, \fBQwtPlot::setAxisScaleDraw()\fP .RE .PP .SH "Constructor & Destructor Documentation" .PP .SS "QwtDateScaleDraw::QwtDateScaleDraw (Qt::TimeSpec timeSpec = \fCQt::LocalTime\fP)" .PP Constructor\&. The default setting is to display tick labels for the given time specification\&. The first week of a year is defined like for \fBQwtDate::FirstThursday\fP\&. .PP \fBParameters\fP .RS 4 \fItimeSpec\fP Time specification .RE .PP \fBSee also\fP .RS 4 \fBsetTimeSpec()\fP, \fBsetWeek0Type()\fP .RE .PP .SH "Member Function Documentation" .PP .SS "QString QwtDateScaleDraw::dateFormat (\fBQwtDate::IntervalType\fP intervalType) const" .PP \fBParameters\fP .RS 4 \fIintervalType\fP Interval type .RE .PP \fBReturns\fP .RS 4 Default format string for an datetime interval type .RE .PP \fBSee also\fP .RS 4 \fBsetDateFormat()\fP, \fBdateFormatOfDate()\fP .RE .PP .SS "QString QwtDateScaleDraw::dateFormatOfDate (const QDateTime & dateTime, \fBQwtDate::IntervalType\fP intervalType) const\fC [protected]\fP, \fC [virtual]\fP" Format string for the representation of a datetime .PP \fBdateFormatOfDate()\fP is intended to be overloaded for situations, where formats are individual for specific datetime values\&. .PP The default setting ignores dateTime and return the default format for the interval type\&. .PP \fBParameters\fP .RS 4 \fIdateTime\fP Datetime value .br \fIintervalType\fP Interval type .RE .PP \fBReturns\fP .RS 4 Format string .RE .PP \fBSee also\fP .RS 4 \fBsetDateFormat()\fP, \fBQwtDate::toString()\fP .RE .PP .SS "\fBQwtDate::IntervalType\fP QwtDateScaleDraw::intervalType (const \fBQwtScaleDiv\fP & scaleDiv) const\fC [protected]\fP, \fC [virtual]\fP" Find the less detailed datetime unit, where no rounding errors happen\&. .PP \fBParameters\fP .RS 4 \fIscaleDiv\fP Scale division .RE .PP \fBReturns\fP .RS 4 Interval type .RE .PP \fBSee also\fP .RS 4 \fBdateFormatOfDate()\fP .RE .PP .SS "\fBQwtText\fP QwtDateScaleDraw::label (double value) const\fC [virtual]\fP" .PP Convert a value into its representing label\&. The value is converted to a datetime value using \fBtoDateTime()\fP and converted to a plain text using \fBQwtDate::toString()\fP\&. .PP \fBParameters\fP .RS 4 \fIvalue\fP Value .RE .PP \fBReturns\fP .RS 4 Label string\&. .RE .PP \fBSee also\fP .RS 4 \fBdateFormatOfDate()\fP .RE .PP .PP Reimplemented from \fBQwtAbstractScaleDraw\fP\&. .SS "void QwtDateScaleDraw::setDateFormat (\fBQwtDate::IntervalType\fP intervalType, const QString & format)" Set the default format string for an datetime interval type .PP \fBParameters\fP .RS 4 \fIintervalType\fP Interval type .br \fIformat\fP Default format string .RE .PP \fBSee also\fP .RS 4 \fBdateFormat()\fP, \fBdateFormatOfDate()\fP, \fBQwtDate::toString()\fP .RE .PP .SS "void QwtDateScaleDraw::setTimeSpec (Qt::TimeSpec timeSpec)" Set the time specification used for the tick labels .PP \fBParameters\fP .RS 4 \fItimeSpec\fP Time specification .RE .PP \fBSee also\fP .RS 4 \fBtimeSpec()\fP, \fBsetUtcOffset()\fP, \fBtoDateTime()\fP .RE .PP .SS "void QwtDateScaleDraw::setUtcOffset (int seconds)" Set the offset in seconds from Coordinated Universal Time .PP \fBParameters\fP .RS 4 \fIseconds\fP Offset in seconds .RE .PP \fBNote\fP .RS 4 The offset has no effect beside for the time specification Qt::OffsetFromUTC\&. .RE .PP \fBSee also\fP .RS 4 QDate::utcOffset(), \fBsetTimeSpec()\fP, \fBtoDateTime()\fP .RE .PP .SS "void QwtDateScaleDraw::setWeek0Type (\fBQwtDate::Week0Type\fP week0Type)" Sets how to identify the first week of a year\&. .PP \fBParameters\fP .RS 4 \fIweek0Type\fP Mode how to identify the first week of a year .RE .PP \fBSee also\fP .RS 4 \fBweek0Type()\fP\&. .RE .PP \fBNote\fP .RS 4 week0Type has no effect beside for intervals classified as \fBQwtDate::Week\fP\&. .RE .PP .SS "Qt::TimeSpec QwtDateScaleDraw::timeSpec () const" .PP \fBReturns\fP .RS 4 Time specification used for the tick labels .RE .PP \fBSee also\fP .RS 4 \fBsetTimeSpec()\fP, \fButcOffset()\fP, \fBtoDateTime()\fP .RE .PP .SS "QDateTime QwtDateScaleDraw::toDateTime (double value) const" Translate a double value into a QDateTime object\&. .PP \fBReturns\fP .RS 4 QDateTime object initialized with \fBtimeSpec()\fP and \fButcOffset()\fP\&. .RE .PP \fBSee also\fP .RS 4 \fBtimeSpec()\fP, \fButcOffset()\fP, \fBQwtDate::toDateTime()\fP .RE .PP .SS "int QwtDateScaleDraw::utcOffset () const" .PP \fBReturns\fP .RS 4 Offset in seconds from Coordinated Universal Time .RE .PP \fBNote\fP .RS 4 The offset has no effect beside for the time specification Qt::OffsetFromUTC\&. .RE .PP \fBSee also\fP .RS 4 QDate::setUtcOffset(), \fBsetTimeSpec()\fP, \fBtoDateTime()\fP .RE .PP .SS "\fBQwtDate::Week0Type\fP QwtDateScaleDraw::week0Type () const" .PP \fBReturns\fP .RS 4 Setting how to identify the first week of a year\&. .RE .PP \fBSee also\fP .RS 4 \fBsetWeek0Type()\fP .RE .PP .SH "Author" .PP Generated automatically by Doxygen for Qwt User's Guide from the source code\&.