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