### 3.1.51 GridPoint

GridPoint objects are created by: Grid_point_engraver.

Standard settings:

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

>   `'(0 . 0)`

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

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

>   `'(0 . 0)`

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

This object supports the following interface(s): grid-point-interface, grob-interface and item-interface.

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