LilyPond Internals Reference: 3.2.33 control-point-interface

### 3.2.33 `control-point-interface`

A grob used to visualize one control point of a Bézier curve (such as a tie or a slur), for ease of tweaking.

#### Internal properties:

`bezier` (graphical (layout) object)

  A pointer to a Bézier curve, for use by control points and polygons.

`index` (non-negative, exact integer)

  For some grobs in a group, this is a number associated with the grob.

This grob interface is used in the following graphical object(s): `ControlPoint`.

#### LilyPond – Internals Reference v2.24.4 (stable-branch).