### 3.1.8 AmbitusNoteHead

AmbitusNoteHead objects are created by: Ambitus_engraver.

Standard settings:

> `duration-log` (integer):

>   `2`

>   The 2-log of the note head duration, i.e., `0` = whole note, `1` = half note, etc.

> `glyph-name` (string):

>   `note-head::calc-glyph-name`

>   The glyph name within the font.

>   In the context of (span) bar lines, glyph-name represents a processed form of `glyph`, where decisions about line breaking etc. are already taken.

> `stencil` (stencil):

>   `ly:note-head::print`

>   The symbol to print.

> `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.

> `Y-offset` (number):

>   `#<unpure-pure-container #<primitive-procedure ly:staff-symbol-referencer::callback> >`

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

This object supports the following interface(s): ambitus-interface, font-interface, grob-interface, item-interface, ledgered-interface, note-head-interface, rhythmic-head-interface and staff-symbol-referencer-interface.

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