### 2.2.38 Figured_bass_engraver

Make figured bass numbers.

Music types accepted:

bass-figure-event and rest-event

Properties (read)

> `figuredBassAlterationDirection` (direction)

>   Where to put alterations relative to the main figure.

> `figuredBassCenterContinuations` (boolean)

>   Whether to vertically center pairs of extender lines. This does not work with three or more lines.

> `figuredBassFormatter` (procedure)

>   A routine generating a markup for a bass figure.

> `ignoreFiguredBassRest` (boolean)

>   Don’t swallow rest events.

> `implicitBassFigures` (list)

>   A list of bass figures that are not printed as numbers, but only as extender lines.

> `useBassFigureExtenders` (boolean)

>   Whether to use extender lines for repeated bass figures.

This engraver creates the following layout object(s):

BassFigure, BassFigureAlignment, BassFigureBracket, BassFigureContinuation and BassFigureLine.

`Figured_bass_engraver` is part of the following context(s): DrumStaff, FiguredBass, GregorianTranscriptionStaff, KievanStaff, MensuralStaff, PetrucciStaff, Staff, TabStaff and VaticanaStaff.

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