34 lines
1.2 KiB
Haskell
34 lines
1.2 KiB
Haskell
{-# LANGUAGE ScopedTypeVariables #-}
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{-# LANGUAGE TypeApplications #-}
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module Graphics.Display where
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import Control.Monad.Representable.Reader
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import Data.Maybe (mapMaybe)
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import GOL.Space
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import Graphics.Gloss
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-- * Drawing the display grid
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square :: Float -> Point -> Picture
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square size (x, y) = translate (x + size / 2) y (rectangleUpperSolid size size)
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squareAtIndex :: (Int, Int) -> Float -> Picture
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squareAtIndex (x, y) size = square size (fromIntegral x * size, fromIntegral y * size)
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drawCell :: DisplayableSpace f => f Bool -> (Int, Int) -> Float -> Maybe Picture
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drawCell xs pos size =
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if index xs pos
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then Just $ squareAtIndex pos size
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else Nothing
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drawCells :: forall f. DisplayableSpace f => f Bool -> Float -> [Picture]
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drawCells xs size =
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let poss = (,) <$> [0 .. sizex @f -1] <*> [0 .. sizey @f -1]
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in mapMaybe (\pos -> drawCell xs pos size) poss
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drawGrid :: forall f. DisplayableSpace f => (Int, Int) -> Color -> f Bool -> Picture
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drawGrid (w, h) c xs =
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let size = fromIntegral $ if w > h then h `div` sizey @f else w `div` sizex @f
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in translate (fromIntegral $ -w `div` 2) (fromIntegral $ -h `div` 2) $
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color c $ pictures $ drawCells xs size |