#### hairpin-interface

A hairpin (de)crescendo.

##### User settable properties:

`grow-direction` (direction)
  Crescendo or decrescendo?
`height` (dimension, in staff space)
  Height of an object in staffspace.

##### Internal properties:

`if-text-padding` (number)
  padding in case texts are there.

This grob interface is used in the following graphical objects: Hairpin

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