from enum import Enum


class Axis(str, Enum):
	""" Co-ordinate axis specifier.

See [cglearn.eu] for background reading.

[cglearn.eu]: https://cglearn.eu/pub/computer-graphics/introduction-to-geometry#material-coordinate-systems-1 """ # noqa: E501
	"""# 'Y' axis. """ # noqa: E501
	Y = 'y'
	"""# 'Z' axis. """ # noqa: E501
	Z = 'z'

	def __str__(self) -> str:
		return str(self.value)