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<a name="beam-interface"></a>
<a name="beam_002dinterface"></a>
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<h4 class="unnumberedsubsec">beam-interface</h4>
<p>A beam.
<p>The <code>thickness</code> property is the weight of beams, measured in staffspace. The <code>direction</code> property is not user-serviceable. Use the <code>direction</code> property of <code>Stem</code> instead.
<h5 class="unnumberedsubsubsec">User settable properties:</h5>
<blockquote>
<dl>
<dt><code>annotation</code> (string)<dd>Annotate a grob for debug purposes.
<br><dt><code>auto-knee-gap</code> (dimension, in staff space)<dd>If a gap is found between note
heads where a horizontal beam fits that is larger than this number,
make a kneed beam.
<br><dt><code>beamed-stem-shorten</code> (list)<dd>How much to shorten beamed stems,
when their direction is forced. It is a list, since the value is
different depending on the number of flags and beams.
<br><dt><code>beaming</code> (pair)<dd>Pair of number lists. Each number list
specifies which beams to make. <code>0</code> is the central beam,
<code>1</code> is the next beam toward the note, etc. This
information is used to determine how to connect the beaming patterns
from stem to stem inside a beam.
<br><dt><code>break-overshoot</code> (pair of numbers)<dd>How much does a broken spanner
stick out of its bounds?
<br><dt><code>clip-edges</code> (boolean)<dd>Allow outward pointing beamlets at the
edges of beams?
<br><dt><code>concaveness</code> (number)<dd>A beam is concave if its inner stems are
closer to the beam than the two outside stems. This number is a
measure of the closeness of the inner stems. It is used for damping
the slope of the beam.
<br><dt><code>damping</code> (number)<dd>Amount of beam slope damping.
<br><dt><code>direction</code> (direction)<dd>If <code>side-axis</code> is <code>0</code> (or
<code>#X</code>), then this property determines whether the object is placed
<code>#LEFT</code>, <code>#CENTER</code> or <code>#RIGHT</code> with respect to the
other object. Otherwise, it determines whether the object is placed
<code>#UP</code>, <code>#CENTER</code> or <code>#DOWN</code>. Numerical values may also
be used: <code>#UP</code>=<code>1</code>, <code>#DOWN</code>=<code>-1</code>,
<code>#LEFT</code>=<code>-1</code>, <code>#RIGHT</code>=<code>1</code>, <code>#CENTER</code>=<code>0</code>.
<br><dt><code>gap</code> (dimension, in staff space)<dd>Size of a gap in a variable symbol.
<br><dt><code>gap-count</code> (integer)<dd>Number of gapped beams for tremolo.
<br><dt><code>grow-direction</code> (direction)<dd>Crescendo or decrescendo?
<br><dt><code>inspect-quants</code> (pair of numbers)<dd>If debugging is set,
set beam and slur quants to this position, and print the respective
scores.
<br><dt><code>knee</code> (boolean)<dd>Is this beam kneed?
<br><dt><code>length-fraction</code> (number)<dd>Multiplier for lengths. Used for
determining ledger lines and stem lengths.
<br><dt><code>neutral-direction</code> (direction)<dd>Which direction to take in the
center of the staff.
<br><dt><code>positions</code> (pair of numbers)<dd>Pair of staff coordinates
<code>(</code><var>left</var><code> . </code><var>right</var><code>)</code>, where both <var>left</var> and
<var>right</var> are in <code>staff-space</code> units of the current staff.
For slurs, this value selects which slur candidate to use; if
extreme positions are requested, the closest one is taken.
<br><dt><code>thickness</code> (number)<dd>Line thickness, generally measured in
<code>line-thickness</code>.
</dl>
</blockquote>
<h5 class="unnumberedsubsubsec">Internal properties:</h5>
<blockquote>
<dl>
<dt><code>details</code> (list)<dd>Alist of parameters for detailed grob behavior.
<p>More information on the allowed parameters can be found by inspecting
<samp><span class="file">lily/slur-scoring.cc</span></samp>, <samp><span class="file">lily/beam-quanting.cc</span></samp>, and
<samp><span class="file">lily/tie-formatting-problem.cc</span></samp>. Setting <code>debug-tie-scoring</code>,
<code>debug-beam-scoring</code> or <code>debug-slur-scoring</code> also provides
useful clues.
<br><dt><code>least-squares-dy</code> (number)<dd>The ideal beam slope, without damping.
<br><dt><code>normal-stems</code> (unknown)<dd>An array of visible stems.
<br><dt><code>quant-score</code> (string)<dd>The beam quanting score; stored for
debugging.
<br><dt><code>quantized-positions</code> (pair of numbers)<dd>The beam positions after
quanting.
<br><dt><code>shorten</code> (dimension, in staff space)<dd>The amount of space that a stem is shortened.
Internally used to distribute beam shortening over stems.
<br><dt><code>stems</code> (unknown)<dd>A list of stem objects, corresponding to the
notes that the arpeggio has to be before.
</dl>
</blockquote>
<p>This grob interface is used in the following graphical object(s): <a href="Beam.es.html#Beam">Beam</a>.
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