LilyPond Internals Reference: 3.2.60 hairpin-interface

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A hairpin crescendo or decrescendo.

bound-padding (number): The amount of padding to insert around spanner bounds.
broken-bound-padding (number): The amount of padding to insert when a spanner is broken at a line break.
circled-tip (boolean): Put a circle at start/end of hairpins (al/del niente).
endpoint-alignments (pair of numbers): A pair of numbers representing the alignments of an object’s endpoints. E.g., the ends of a hairpin relative to NoteColumn grobs.
grow-direction (direction): Crescendo or decrescendo?
height (dimension, in staff space): Height of an object in staff-space units.
shorten-pair (pair of numbers): The lengths to shorten on both sides a hairpin or text-spanner such as a pedal bracket. Positive values shorten the hairpin or text-spanner, while negative values lengthen it.

adjacent-spanners (array of grobs): An array of directly neighboring dynamic spanners.
concurrent-hairpins (array of grobs): All concurrent hairpins.

This grob interface is used in the following graphical object(s): Hairpin.

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