Game.LambdaHack.Tile

Operations concerning dungeon level tiles.

Unlike for many other content types, there is no type Tile, of particular concrete tiles in the dungeon, corresponding to TileKind (the type of kinds of terrain tiles). This is because the tiles are too numerous and there's not enough storage space for a well-rounded Tile type, on one hand, and on the other hand, tiles are accessed too often in performance critical code to try to compress their representation and/or recompute them. Instead, of defining a Tile type, we express various properties of concrete tiles by arrays or sparse IntMaps, as appropriate.

Actors at normal speed (2 m/s) take one turn to move one tile (1 m by 1 m).

Documentation

type SecretTime = Time

The time interval needed to discover a given secret, e.g., a hidden terrain tile, e.g., a hidden door.

type SmellTime = Time

The last time a hero left a smell in a given tile. To be used by monsters that hunt by smell.

kindHasFeature :: Feature -> TileKind -> Bool

Whether a tile kind has the given feature.

kindHas :: [Feature] -> [Feature] -> TileKind -> Bool

Whether a tile kind has all features of the first set and no features of the second.

hasFeature :: Ops TileKind -> Feature -> Id TileKind -> Bool

Whether a tile kind (specified by its id) has the given feature.

isClear :: Ops TileKind -> Id TileKind -> Bool

Whether a tile does not block vision. Essential for efficiency of FOV, hence tabulated.

isLit :: Ops TileKind -> Id TileKind -> Bool

Whether a tile is lit on its own. Essential for efficiency of Perception, hence tabulated.

similar :: TileKind -> TileKind -> Bool

The player can't tell one tile from the other.

canBeHidden :: Ops TileKind -> TileKind -> Bool

The player can't tell if the tile is hidden or not.