BishBosh.Cartesian.Ordinate

AUTHOR

Dr. Alistair Ward

DESCRIPTION

• Describes the y-axis by which the board is indexed.
• N.B. this coordinate-system is for internal use only, and doesn't attempt to replicate any standard Chess-notation.

Constants

yOrigin :: Int

The constant length of the y-axis.

yLength :: Distance

The constant length of the y-axis.

yMin :: Enum y => y

The constant lower bound of the ordinate.

yMax :: Enum y => y

The constant upper bound of the ordinate.

yRange :: Enum y => [y]

The constant list of ordinates.

centre :: Fractional centre => centre

• The constant centre of the span.
• CAVEAT: no square actually exists at this fractional value.

Functions

firstRank :: Enum y => LogicalColour -> y

The rank from which pieces conventionally start.

lastRank :: Enum y => LogicalColour -> y

The final rank; i.e. the one on which a Pawn is promoted.

pawnsFirstRank :: Enum y => LogicalColour -> y

The rank from which Pawns conventionally start.

enPassantRank :: Enum y => LogicalColour -> y

The rank from which a Pawn may capture en-passant.

reflect :: Enum y => y -> y

Reflects about the mid-point of the axis.

translate :: (Enum y, Ord y) => (y -> y) -> y -> y

Translate the specified ordinate.

maybeTranslate :: (Enum y, Ord y) => (y -> y) -> y -> Maybe y

Where legal, translate the specified ordinate.

Predicates

inBounds :: (Enum y, Ord y) => y -> Bool

Predicate.