### 3.1.133 UnaCordaPedalLineSpanner

UnaCordaPedalLineSpanner objects are created by: Piano_pedal_align_engraver.

Standard settings:

> `axes` (list):

>   `'(1)`

>   List of axis numbers. In the case of alignment grobs, this should contain only one number.

> `direction` (direction):

>   `-1`

>   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`.

> `minimum-space` (dimension, in staff space):

>   `1.0`

>   Minimum distance that the victim should move (after padding).

> `outside-staff-priority` (number):

>   `1000`

>   If set, the grob is positioned outside the staff in such a way as to avoid all collisions. In case of a potential collision, the grob with the smaller `outside-staff-priority` is closer to the staff.

> `padding` (dimension, in staff space):

>   `1.2`

>   Add this much extra space between objects that are next to each other.

> `side-axis` (number):

>   `1`

>   If the value is `X` (or equivalently `0`), the object is placed horizontally next to the other object. If the value is `Y` or `1`, it is placed vertically.

> `staff-padding` (dimension, in staff space):

>   `1.2`

>   Maintain this much space between reference points and the staff. Its effect is to align objects of differing sizes (like the dynamics p and f) on their baselines.

> `vertical-skylines` (pair of skylines):

>   `#<unpure-pure-container #<primitive-procedure ly:grob::vertical-skylines-from-element-stencils> #<primitive-procedure ly:grob::pure-vertical-skylines-from-element-stencils> >`

>   Two skylines, one above and one below this grob.

> `X-extent` (pair of numbers):

>   `ly:axis-group-interface::width`

>   Extent (size) in the X direction, measured in staff-space units, relative to object’s reference point.

> `Y-extent` (pair of numbers):

>   `#<unpure-pure-container #<primitive-procedure ly:axis-group-interface::height> #<primitive-procedure ly:axis-group-interface::pure-height> >`

>   Extent (size) in the Y direction, measured in staff-space units, relative to object’s reference point.

> `Y-offset` (number):

>   `#<unpure-pure-container #<primitive-procedure ly:side-position-interface::y-aligned-side> #<primitive-procedure ly:side-position-interface::pure-y-aligned-side> >`

>   The vertical amount that this object is moved relative to its Y-parent.

This object supports the following interface(s): axis-group-interface, grob-interface, piano-pedal-interface, side-position-interface and spanner-interface.

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