### 3.1.127 TrillPitchGroup

TrillPitchGroup objects are created by: Pitched_trill_engraver.

Standard settings:

> `axes` (list):

>   `'(0)`

>   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`.

> `font-size` (number):

>   `-4`

>   The font size, compared to the ‘normal’ size. `0` is style-sheet’s normal size, `-1` is smaller, `+1` is bigger. Each step of 1 is approximately 12% larger; 6 steps are exactly a factor 2 larger. Fractional values are allowed.

> `horizon-padding` (number):

>   `0.1`

>   The amount to pad the axis along which a `Skyline` is built for the `side-position-interface`.

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

>   `2.5`

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

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

>   `0.3`

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

> `side-axis` (number):

>   `0`

>   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.

> `stencil` (stencil):

>   `parenthesize-elements`

>   The symbol to print.

> `stencils` (list):

>   `parentheses-item::calc-parenthesis-stencils`

>   Multiple stencils, used as intermediate value.

> `X-offset` (number):

>   `ly:side-position-interface::x-aligned-side`

>   The horizontal amount that this object is moved relative to its X-parent.

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

>   `#<unpure-pure-container #<primitive-procedure ly:grob::stencil-height> >`

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

This object supports the following interface(s): axis-group-interface, font-interface, grob-interface, item-interface, note-head-interface, parentheses-interface and side-position-interface.

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