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module Xanthous.Generators.LevelContents
( chooseCharacterPosition
, randomItems
, randomCreatures
, randomDoors
, placeDownStaircase
, tutorialMessage
) where
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import Xanthous.Prelude
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import Control.Monad.Random
import Data.Array.IArray (amap, bounds, rangeSize, (!))
import qualified Data.Array.IArray as Arr
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import Xanthous.Generators.Util
import Xanthous.Random
import Xanthous.Data (Position, _Position, positionFromPair)
import Xanthous.Data.EntityMap (EntityMap, _EntityMap)
import Xanthous.Entities.Raws (rawsWithType, RawType)
import qualified Xanthous.Entities.Item as Item
import Xanthous.Entities.Item (Item)
import qualified Xanthous.Entities.Creature as Creature
import Xanthous.Entities.Creature (Creature)
import Xanthous.Entities.Environment
(GroundMessage(..), Door(..), unlockedDoor, Staircase(..))
import Xanthous.Messages (message_)
import Xanthous.Util.Graphics (circle)
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chooseCharacterPosition :: MonadRandom m => Cells -> m Position
chooseCharacterPosition = randomPosition
randomItems :: MonadRandom m => Cells -> m (EntityMap Item)
randomItems = randomEntities Item.newWithType (0.0004, 0.001)
placeDownStaircase :: MonadRandom m => Cells -> m (EntityMap Staircase)
placeDownStaircase cells = do
pos <- randomPosition cells
pure $ _EntityMap # [(pos, DownStaircase)]
randomDoors :: MonadRandom m => Cells -> m (EntityMap Door)
randomDoors cells = do
doorRatio <- getRandomR subsetRange
let numDoors = floor $ doorRatio * fromIntegral (length candidateCells)
doorPositions = positionFromPair <$> take numDoors candidateCells
doors = zip doorPositions $ repeat unlockedDoor
pure $ _EntityMap # doors
where
candidateCells = filter doorable $ Arr.indices cells
subsetRange = (0.8 :: Double, 1.0)
doorable (x, y) =
not (fromMaybe True $ cells ^? ix (x, y))
&&
( fromMaybe True $ cells ^? ix (x - 1, y) -- left
, fromMaybe True $ cells ^? ix (x, y - 1) -- top
, fromMaybe True $ cells ^? ix (x + 1, y) -- right
, fromMaybe True $ cells ^? ix (x, y + 1) -- bottom
) `elem` [ (True, False, True, False)
, (False, True, False, True)
]
randomCreatures :: MonadRandom m => Cells -> m (EntityMap Creature)
randomCreatures = randomEntities Creature.newWithType (0.0007, 0.003)
tutorialMessage :: MonadRandom m
=> Cells
-> Position -- ^ CharacterPosition
-> m (EntityMap GroundMessage)
tutorialMessage cells characterPosition = do
let distance = 2
pos <- fmap (fromMaybe (error "No valid positions for tutorial message?"))
. choose . ChooseElement
$ accessiblePositionsWithin distance cells characterPosition
msg <- message_ ["tutorial", "message1"]
pure $ _EntityMap # [(pos, GroundMessage msg)]
where
accessiblePositionsWithin :: Int -> Cells -> Position -> [Position]
accessiblePositionsWithin dist valid pos =
review _Position
<$> filter (\(px, py) -> not $ valid ! (fromIntegral px, fromIntegral py))
(circle (pos ^. _Position) dist)
randomEntities
:: forall entity raw m. (MonadRandom m, RawType raw)
=> (raw -> entity)
-> (Float, Float)
-> Cells
-> m (EntityMap entity)
randomEntities newWithType sizeRange cells =
case fromNullable $ rawsWithType @raw of
Nothing -> pure mempty
Just raws -> do
let len = rangeSize $ bounds cells
(numEntities :: Int) <-
floor . (* fromIntegral len) <$> getRandomR sizeRange
entities <- for [0..numEntities] $ const $ do
pos <- randomPosition cells
raw <- choose raws
let entity = newWithType raw
pure (pos, entity)
pure $ _EntityMap # entities
randomPosition :: MonadRandom m => Cells -> m Position
randomPosition = fmap positionFromPair . choose . impureNonNull . cellCandidates
-- cellCandidates :: Cells -> Cells
cellCandidates :: Cells -> Set (Word, Word)
cellCandidates
-- find the largest contiguous region of cells in the cave.
= maximumBy (compare `on` length)
. fromMaybe (error "No regions generated! this should never happen.")
. fromNullable
. regions
-- cells ends up with true = wall, we want true = can put an item here
. amap not
