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Diffstat (limited to 'users/grfn/xanthous/src/Xanthous/Generators/LevelContents.hs')
| -rw-r--r-- | users/grfn/xanthous/src/Xanthous/Generators/LevelContents.hs | 133 |
1 files changed, 133 insertions, 0 deletions
diff --git a/users/grfn/xanthous/src/Xanthous/Generators/LevelContents.hs b/users/grfn/xanthous/src/Xanthous/Generators/LevelContents.hs new file mode 100644 index 0000000000..8ebcc7f4da --- /dev/null +++ b/users/grfn/xanthous/src/Xanthous/Generators/LevelContents.hs @@ -0,0 +1,133 @@ +-------------------------------------------------------------------------------- +module Xanthous.Generators.LevelContents + ( chooseCharacterPosition + , randomItems + , randomCreatures + , randomDoors + , placeDownStaircase + , tutorialMessage + ) where +-------------------------------------------------------------------------------- +import Xanthous.Prelude hiding (any, toList) +-------------------------------------------------------------------------------- +import Control.Monad.Random +import Data.Array.IArray (amap, bounds, rangeSize, (!)) +import qualified Data.Array.IArray as Arr +import Data.Foldable (any, toList) +import Linear.V2 +-------------------------------------------------------------------------------- +import Xanthous.Generators.Util +import Xanthous.Random +import Xanthous.Data + ( positionFromV2, Position, _Position + , rotations, arrayNeighbors, Neighbors(..) + , neighborPositions + ) +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) +-------------------------------------------------------------------------------- + +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 = + removeAdjacent . fmap positionFromV2 . take numDoors $ candidateCells + doors = zip doorPositions $ repeat unlockedDoor + pure $ _EntityMap # doors + where + removeAdjacent = + foldr (\pos acc -> + if pos `elem` (acc >>= toList . neighborPositions) + then acc + else pos : acc + ) [] + candidateCells = filter doorable $ Arr.indices cells + subsetRange = (0.8 :: Double, 1.0) + doorable pos = + not (fromMaybe True $ cells ^? ix pos) + && any (teeish . fmap (fromMaybe True)) + (rotations $ arrayNeighbors cells pos) + -- only generate doors at the *ends* of hallways, eg (where O is walkable, + -- X is a wall, and D is a door): + -- + -- O O O + -- X D X + -- O + teeish (fmap not -> (Neighbors tl t tr l r _ b _ )) = + and [tl, t, tr, b] && (and . fmap not) [l, r] + +randomCreatures :: MonadRandom m => Cells -> m (EntityMap Creature) +randomCreatures = randomEntities Creature.newWithType (0.0007, 0.002) + +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 + (\pt -> not $ valid ! (fromIntegral <$> pt)) + (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 positionFromV2 . choose . impureNonNull . cellCandidates + +-- cellCandidates :: Cells -> Cells +cellCandidates :: Cells -> Set (V2 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 |