### 3.2.97 semi-tie-column-interface

The interface for a column of l.v. (laissez vibrer) ties.

#### User settable properties:

> `direction` (direction)

>   If `side-axis` is `0` (or `X`), then this property determines whether the object is placed `LEFT`, `CENTER` or `RIGHT` with respect to the other object. Otherwise, it determines whether the object is placed `UP`, `CENTER` or `DOWN`. Numerical values may also be used: `UP`=`1`, `DOWN`=`-1`, `LEFT`=`-1`, `RIGHT`=`1`, `CENTER`=`0`.

> `head-direction` (direction)

>   Are the note heads left or right in a semitie?

> `tie-configuration` (list)

>   List of `(position . dir)` pairs, indicating the desired tie configuration, where position is the offset from the center of the staff in staff space and dir indicates the direction of the tie (`1`=>up, `-1`=>down, `0`=>center). A non-pair entry in the list causes the corresponding tie to be formatted automatically.

#### Internal properties:

> `positioning-done` (boolean)

>   Used to signal that a positioning element did its job. This ensures that a positioning is only done once.

> `ties` (array of grobs)

>   A grob array of `Tie` objects.

This grob interface is used in the following graphical object(s): LaissezVibrerTieColumn and RepeatTieColumn.

#### Internals Reference v2.18.2 (稳定分支).