127 lines
4.5 KiB
TeX
127 lines
4.5 KiB
TeX
\chapter{Bar Numbering}
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The current bar number is stored in a count register call \keyindex{barno}.
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When \verb|\startpiece| is encountered, \verb|\barno| is set equal to
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another count register called \verb|\startbarno|, whose default value is one.
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Therefore, if you want the first bar to have a number $n$ different from~$1$, you
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may either say \verb|\startbarno=|$n$ before \verb|\startpiece|, or say
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\verb|\barno=|$n$ afterwards, but before the first bar line. You may also alter the bar
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number at any time, either by explicitly resetting \verb|\barno|, or by
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incrementing it with a command like \verb|\advance\barno-1|.
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\musixtex\ supports two distinct modes for printing bar numbers. In \ital{periodic}
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bar numbering, the bar number is
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placed above the top staff with a user-selectable frequency. In
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\ital{system} bar numbering, the
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number will appear at the beginning of each system.
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\section{Periodic bar numbering}
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In a normal piece, periodic bar number printing is turned on by default, with a frequency
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of one. In an extract, the default is to not print bar numbers.
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To turn off bar numbering say \keyindex{nobarnumbers}. To reinstate periodic
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bar numbering, or to initiate it in an extract, say \keyindex{barnumbers}.
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To change to a
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different frequency $n$, say \verb|\def|\keyindex{freqbarno}\verb|{|$n$\verb|}|.
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The appearance and positioning of the bar number is controlled by the
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token \keyindex{writethebarno}, which by default is defined as\\
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\verb|\def\writethebarno{\fontbarno\the\barno\kernm\qn@width}|
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where the font is defined as \verb|\def\fontbarno{\it}|. You can change
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either of these as desired, for example
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\medskip
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\begin{music}\barnumbers
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\parindent0pt\startpiece
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\Notes\Dqbu gh\Dqbl jh\en
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\notes\Dqbbu fg\Dqbbl hk\en\bar
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\Notes\Tqbu ghi\Tqbl mmj\en
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\def\fontbarno{\bf}%
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\notes\Tqbbu fgj\Tqbbl njh\en\bar
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\Notes\Qqbu ghjh\Qqbl jifh\en\bar
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\notes\Qqbbu fgge\Qqbbl jhgi\en\endpiece
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\end{music}
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\noindent which was coded as
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\begin{quote}\begin{verbatim}\barnumbers
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\Notes\Dqbu gh\Dqbl jh\en
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\notes\Dqbbu fg\Dqbbl hk\en\bar
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\Notes\Tqbu ghi\Tqbl mmj\en
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\def\fontbarno{\bf}%
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\notes\Tqbbu fgj\Tqbbl njh\en\bar
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\Notes\Qqbu ghjh\Qqbl jifh\en\bar
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\notes\Qqbbu fgge\Qqbbl jhgi\en
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\end{verbatim}\end{quote}
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\section{System bar numbering}
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To have a bar number printed just above the beginning of each system, use
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\keyindex{systemnumbers}. The distance above the staff is controlled
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by \verb|\raisebarno|, which by default is \verb|4\internote| (to fit
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above a treble clef). This can be redefined with the command
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\begin{quote}
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\verb|\def|\keyindex{raisebarno}\verb|{|\ital{any \TeX~dimension}\verb|}|
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\end{quote}
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Similarly, the horizontal position is defined by \keyindex{shiftbarno}
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which by default is \verb|0pt|.
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The number normally is enclosed in a
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box. If you don't like that, you may redefine the macro \verb|\writebarno|
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which by default is defined as
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\begin{quote}
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\verb|\def|\keyindex{writebarno}\verb|{\boxit{\eightbf\the\barno\barnoadd}}|
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\end{quote}
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This uses the utility \musixtex\ macro \keyindex{boxit} which will enclose
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any text string in a box.
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Here are some possible alternate formats for system bar numbers:
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\medskip
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\begin{music}\nostartrule
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\def\fontbarno{\it}%
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\let\extractline\hbox
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\startbarno=36
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\hbox to \hsize{%
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\hss
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\raise20pt\hbox{(a) }%
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\systemnumbers\startextract
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\Notes\wh g\en
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\zendextract
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\hss
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\def\writebarno{\tenrm\the\barno\barnoadd}%
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\def\raisebarno{2\internote}%
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\def\shiftbarno{2.5\Interligne}%
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\raise20pt\hbox{(b) }%
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\systemnumbers\startextract
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\Notes\wh g\en
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\zendextract
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\hss
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\def\writebarno{\llap{\tenbf\the\barno\barnoadd}}%
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\def\raisebarno{2\internote}%
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\def\shiftbarno{1.3\Interligne}%
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\raise20pt\hbox{(c) }%
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\systemnumbers\startextract
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\Notes\wh g\en
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\zendextract
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\hss}
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\end{music}
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\noindent These were coded as
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\begin{itemize}\setlength{\itemsep}{0ex}
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\item[(a)] (default)
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\item[(b)]
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\begin{verbatim}
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\def\writebarno{\tenrm\the\barno\barnoadd}%
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\def\raisebarno{2\internote}%
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\def\shiftbarno{2.5\Interligne}%
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\end{verbatim}
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\item[(c)]
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\begin{verbatim}
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\def\writebarno{\llap{\tenbf\the\barno\barnoadd}}%
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\def\raisebarno{2\internote}%
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\def\shiftbarno{1.3\Interligne}%
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\end{verbatim}
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\end{itemize}
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If the previous line does not stop with a bar rule, then the next
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printed system bar number will immediately be followed by the contents
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of the token \keyindex{writezbarno}, whose
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default setting is the lower case character `\verb|a|'. You might want to
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change this to `\verb|+|', in which case you should say
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\verb|\def\writezbarno{+}|.
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