50 lines
1.1 KiB
Haskell
50 lines
1.1 KiB
Haskell
module Helpers
|
|
( v2x
|
|
, v2y
|
|
, drawMap
|
|
, drawLine
|
|
, unitVecs
|
|
) where
|
|
|
|
import Data.List
|
|
import Data.List.Split
|
|
import qualified Data.Map as M
|
|
import Linear.V2
|
|
|
|
v2x :: V2 a -> a
|
|
v2x (V2 x _) = x
|
|
|
|
v2y :: V2 a -> a
|
|
v2y (V2 _ y) = y
|
|
|
|
unitVecs :: [V2 Int]
|
|
unitVecs = take 4 $ iterate perp (V2 0 1)
|
|
|
|
drawLine :: V2 Int -> [V2 Int]
|
|
drawLine (V2 0 0) = []
|
|
drawLine (V2 a b)
|
|
| abs a > abs b = V2 (a - signum a) b : drawLine (V2 (a - signum a) b)
|
|
| otherwise = V2 a (b - signum b) : drawLine (V2 a (b - signum b))
|
|
--getBounds :: M.Map (V2 Int) Integer -> (Int, Int, Int, Int)
|
|
getBounds m = (getMinX, getMinY, getMaxX, getMaxY)
|
|
where
|
|
getMaxX = getFromMap maximum v2x
|
|
getMaxY = getFromMap maximum v2y
|
|
getMinX = getFromMap minimum v2x
|
|
getMinY = getFromMap minimum v2y
|
|
getFromMap f1 f2 = M.foldrWithKey (\k _ result -> f1 [f2 k, result]) 0 m
|
|
|
|
drawMap :: M.Map (V2 Int) Char -> String
|
|
drawMap m =
|
|
intercalate "\n" $
|
|
transpose $
|
|
chunksOf
|
|
(abs (abs y1 - abs y2) + 1)
|
|
[ M.findWithDefault ' ' (V2 x y) m
|
|
| x <- [x1 .. x2]
|
|
, y <- [y1 .. y2]
|
|
]
|
|
where
|
|
(x1, y1, x2, y2) = getBounds m
|
|
|