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<a name="Optimal-page-turning"></a>
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<h4 class="subsection">4.3.4 Optimal page turning</h4>
<p><a name="index-ly_003apage_002dturn_002dbreaking-2552"></a><a name="index-ly_003apage_002dturn_002dbreaking-2553"></a>
<p>Often it is necessary to find a page breaking configuration so that there is
a rest at the end of every second page. This way, the musician can turn the
page without having to miss notes. The <code>ly:page-turn-breaking</code> function
attempts to find a page breaking minimizing cramping and stretching, but with
the additional restriction that it is only allowed to introduce page turns
in specified places.
<p>There are two steps to using this page breaking function. First, you
must enable it in the <code>\paper</code> block, as explained in <a href="Page-breaking.fr.html#Page-breaking">Page breaking</a>. Then you must tell the function where you would like to allow
page breaks.
<p>There are two ways to achieve the second step. First, you can specify each
potential page turn manually, by inserting <code>\allowPageTurn</code> into your
input file at the appropriate places.
<p>If this is too tedious, you can add a <code>Page_turn_engraver</code> to a Staff or
Voice context. The <code>Page_turn_engraver</code> will scan the context for
sections without notes (note that it does not scan for rests; it scans for
the absence of notes. This is so that single-staff polyphony with rests in one
of the parts does not throw off the <code>Page_turn_engraver</code>). When it finds
a sufficiently long section without notes, the <code>Page_turn_engraver</code> will
insert an <code>\allowPageTurn</code> at the final bar line in that section, unless
there is a ‘special’ bar line (such as a double bar), in which case the
<code>\allowPageTurn</code> will be inserted at the final ‘special’ bar line in
the section.
<p><a name="index-minimumPageTurnLength-2554"></a><a name="index-minimumPageTurnLength-2555"></a>
The <code>Page_turn_engraver</code> reads the context property
<code>minimumPageTurnLength</code> to determine how long a note-free section must
be before a page turn is considered. The default value for
<code>minimumPageTurnLength</code> is <code>#(ly:make-moment 1 1)</code>. If you want
to disable page turns, you can set it to something very large.
<pre class="example">\new Staff \with { \consists "Page_turn_engraver" }
{
a4 b c d |
R1 | % a page turn will be allowed here
a4 b c d |
\set Staff.minimumPageTurnLength = #(ly:make-moment 5 2)
R1 | % a page turn will not be allowed here
a4 b r2 |
R1*2 | % a page turn will be allowed here
a1
}
</pre>
<p><a name="index-minimumRepeatLengthForPageTurn-2556"></a><a name="index-minimumRepeatLengthForPageTurn-2557"></a>
The <code>Page_turn_engraver</code> detects volta repeats. It will only allow a page
turn during the repeat if there is enough time at the beginning and end of the
repeat to turn the page back. The <code>Page_turn_engraver</code> can also disable
page turns if the repeat is very short. If you set the context property
<code>minimumRepeatLengthForPageTurn</code> then the <code>Page_turn_engraver</code> will
only allow turns in repeats whose duration is longer than this value.
<p>The page turning commands, <code>\pageTurn</code>, <code>\noPageTurn</code> and
<code>\allowPageTurn</code>, may also be used at top-level, between scores and
top-level markups.
<p class="noindent">
<h5 class="subsubheading">Predefined commands</h5>
<p><a name="index-g_t_005cpageTurn-2558"></a><a name="index-g_t_005cpageTurn-2559"></a>
<code>\pageTurn</code>
<a name="index-g_t_005cnoPageTurn-2560"></a><a name="index-g_t_005cnoPageTurn-2561"></a>
<code>\noPageTurn</code>
<a name="index-g_t_005callowPageTurn-2562"></a><a name="index-g_t_005callowPageTurn-2563"></a>
<code>\allowPageTurn</code>
<p class="noindent">
<h5 class="subsubheading">Known issues and warnings</h5>
<p>There should only be one <code>Page_turn_engraver</code> in a score. If there is more
than one, they will interfere with each other.
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