BishBosh.Property.Rotatable

AUTHOR

Dr. Alistair Ward

DESCRIPTION

• An interface for data which can be transformed by rotation.
• CAVEAT: only rotations in discrete 90-degrees steps are considered.

Type-classes

class (ReflectableOnX a, ReflectableOnY a) => Rotatable a where

An interface which data which can be transformed by rotation, may implement.

Minimal complete definition

rotate90, rotate270

Methods

rotate90

Arguments

:: a

-> a

Rotate anticlockwise by 90 degrees, so that N becomes W.

rotate180

Arguments

:: a

-> a

Rotate by 180 degrees.

rotate270

Arguments

:: a

-> a

Rotate clockwise by 90 degrees, so that N becomes E.

Instances

(Enum x, Enum y) => Rotatable (Coordinates x y)

Methods

rotate90 :: Coordinates x y -> Coordinates x y

rotate180 :: Coordinates x y -> Coordinates x y

rotate270 :: Coordinates x y -> Coordinates x y