LilyPond Internals Reference: 3.2.43 hairpin-interface

### 3.2.43 hairpin-interface

A hairpin crescendo or decrescendo.

#### User settable properties:

> `circled-tip` (boolean)

>   Put a circle at start/end of hairpins (al/del niente).

> `bound-padding` (number)

>   The amount of padding to insert around spanner bounds.

> `grow-direction` (direction)

>   Crescendo or decrescendo?

> `height` (dimension, in staff space)

>   Height of an object in `staff-space` units.

#### Internal properties:

> `adjacent-spanners` (array of grobs)

>   An array of directly neighboring dynamic spanners.

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

#### Internals Reference