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<a name="axis-group-interface"></a>
<a name="axis_002dgroup_002dinterface"></a>
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<h4 class="unnumberedsubsec">axis-group-interface</h4>
<p>An object that groups other layout objects.
<h5 class="unnumberedsubsubsec">User settable properties:</h5>
<blockquote>
<dl>
<dt><code>axes</code> (list)<dd>List of axis numbers. In the case of alignment
grobs, this should contain only one number.
<br><dt><code>keep-fixed-while-stretching</code> (boolean)<dd>A grob with this property
set to true is fixed relative to the staff above it when systems are
stretched.
<br><dt><code>max-stretch</code> (number)<dd>The maximum amount that this
<code>VerticalAxisGroup</code> can be vertically stretched (for example, in
order to better fill a page).
<br><dt><code>no-alignment</code> (boolean)<dd>If set, don't place this grob in a
<code>VerticalAlignment</code>; rather, place it using its own <code>Y-offset</code>
callback.
<br><dt><code>vertical-skylines</code> (unknown)<dd>Two skylines, one above and
one below this grob.
</dl>
</blockquote>
<h5 class="unnumberedsubsubsec">Internal properties:</h5>
<blockquote>
<dl>
<dt><code>X-common</code> (layout object)<dd>Common reference point for axis group.
<br><dt><code>Y-common</code> (layout object)<dd>See <code>X-common</code>.
<br><dt><code>adjacent-pure-heights</code> (vector)<dd>Used by a <code>VerticalAxisGroup</code> to
cache the <code>Y-extent</code>s of different column ranges.
<br><dt><code>elements</code> (unknown)<dd>A list of grobs; the type is depending on
the grob where this is set in.
<br><dt><code>pure-Y-common</code> (layout object)<dd>A cache of the
<code>common_refpoint_of_array</code> of the <code>elements</code> grob set.
<br><dt><code>pure-relevant-items</code> (unknown)<dd>A subset of elements that are
relevant for finding the <code>pure-Y-extent</code>.
<br><dt><code>pure-relevant-spanners</code> (unknown)<dd>A subset of elements that are
relevant for finding the <code>pure-Y-extent</code>.
</dl>
</blockquote>
<p>This grob interface is used in the following graphical object(s): <a href="Ambitus.fr.html#Ambitus">Ambitus</a>, <a href="BassFigureAlignment.fr.html#BassFigureAlignment">BassFigureAlignment</a>, <a href="BassFigureAlignmentPositioning.fr.html#BassFigureAlignmentPositioning">BassFigureAlignmentPositioning</a>, <a href="BassFigureLine.fr.html#BassFigureLine">BassFigureLine</a>, <a href="BreakAlignGroup.fr.html#BreakAlignGroup">BreakAlignGroup</a>, <a href="BreakAlignment.fr.html#BreakAlignment">BreakAlignment</a>, <a href="DotColumn.fr.html#DotColumn">DotColumn</a>, <a href="DynamicLineSpanner.fr.html#DynamicLineSpanner">DynamicLineSpanner</a>, <a href="NonMusicalPaperColumn.fr.html#NonMusicalPaperColumn">NonMusicalPaperColumn</a>, <a href="NoteCollision.fr.html#NoteCollision">NoteCollision</a>, <a href="NoteColumn.fr.html#NoteColumn">NoteColumn</a>, <a href="PaperColumn.fr.html#PaperColumn">PaperColumn</a>, <a href="SostenutoPedalLineSpanner.fr.html#SostenutoPedalLineSpanner">SostenutoPedalLineSpanner</a>, <a href="SustainPedalLineSpanner.fr.html#SustainPedalLineSpanner">SustainPedalLineSpanner</a>, <a href="System.fr.html#System">System</a>, <a href="TrillPitchGroup.fr.html#TrillPitchGroup">TrillPitchGroup</a>, <a href="UnaCordaPedalLineSpanner.fr.html#UnaCordaPedalLineSpanner">UnaCordaPedalLineSpanner</a>, <a href="VerticalAlignment.fr.html#VerticalAlignment">VerticalAlignment</a>, <a href="VerticalAxisGroup.fr.html#VerticalAxisGroup">VerticalAxisGroup</a> and <a href="VoltaBracketSpanner.fr.html#VoltaBracketSpanner">VoltaBracketSpanner</a>.
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