Represents an axis in a multiple master or variable font.

  • When writing to Babelfont-JSON, this class must be serialized without newlines

    Axis.name

  • Python type: I18NDictionary

  • Required field

The display name for this axis. Localizable.

Axis.tag

  • Python type: str

  • Required field

The four-letter axis tag.

Axis.id

  • Python type: str

An ID used to refer to this axis in the Master, Layer and Instance location fields. (This is allows the user to change the axis tag without the locations becoming lost.) If not provided, one will be automatically generated on import from a UUID.

Axis.min

  • Python type: int

The minimum value of this axis, in user space coordinates. If not provided, defaults to None.

Axis.max

  • Python type: int

The maximum value of this axis, in user space coordinates. If not provided, defaults to None.

Axis.default

  • Python type: int

The default value of this axis (center of interpolation), in user space coordinates. Note that if the min/max/default values are not supplied, they are returned as None in the Python object, and should be computed from the master locations on export. If not provided, defaults to None.

Axis.map

  • Python type: [(int, int)]

The mapping between userspace and designspace coordinates. If not provided, defaults to None.

Axis._formatspecific

  • Python type: dict

Each object in Babelfont has an optional attached dictionary to allow the storage of format-specific information. Font creation software may store any additional information that they wish to have preserved on import and export under a namespaced (reverse-domain) key in this dictionary. For example, information specific to the Glyphs software should be stored under the key com.glyphsapp. The value stored under this key may be any data serializable in JSON; typically it will be a dict.

Note that there is an important distinction between the Python object format of this field and the Babelfont-JSON representation. When stored to JSON, this key is exported not as _formatspecific but as a simple underscore (_).