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spanner
Spanners are a class of grobs that are not horizontally fixed on one point of the score but extend from one point to another. Examples include beams, ties, and slurs, as well as hairpins and staff lines. Whereas non-spanners can only be broken into at most two visible pieces (for example, a clef duplicated at the end of the line and the beginning of the next line), spanners are broken into as many pieces as required by their start and end points (such as a long crescendo extending on three systems, or staff lines, which always span the whole score).
Technically, spanners are defined as grobs having the
spanner-interface; on the C++ side of LilyPond, they are
instances of the Spanner subclass of Grob. The
left and right bounds of a spanner can be retrieved and set using
ly:spanner-bound and ly:spanner-set-bound!,
respectively. The bounds are always items. The X parent of
a spanner has little musical sense, but is usually set to the left
bound.
See also
Notation Reference: Spanners.
Internals Reference: all-layout-objects, spanner-interface.
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