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module Main where
import Data.Bifunctor (Bifunctor, bimap)
import qualified Data.ByteString as B
import qualified Data.ByteString.Lazy as BL
import qualified Data.Text as T
import Data.Word (Word8)
import PFM
newtype Vec = Vec { unVec :: (Int, Int, Int) }
clamp :: PFMColour -> PPMColour
clamp (PFMColour ri gi bi) =
PPMColour (f ri) (f gi) (f bi)
where
v s = s * 255.0
f s = if v s > 255.0 then 255 else fromInteger (round (v s))
clamp _ = undefined
clampImage :: PFMImage -> PPMImage
clampImage (PFMImage w h c) =
PPMImage w h . reverse $ fmap clamp <$> c
bmap :: (Bifunctor f) => (a -> b) -> f a a -> f b b
bmap f = bimap f f
toCircle :: Int -> [[(Int, Int)]] -> [[PFMColour]]
toCircle v m =
fmap toCol <$> m
where
toCol val = if dist val <= v ^ (2 :: Int)
then PFMColour 1.0 0.5 0.5
else PFMColour 0.5 0.5 1.0
dist = add . bmap ((^(2 :: Int)) . (v-))
add (an, bn) = an + bn
circleImage :: Int -> PFMImage
circleImage s = PFMImage s s $ toCircle ((s - 1) `div` 2)
[ [ (y, x) | x <- [0..s-1] ] | y <- [0..s-1] ]
main :: IO ()
main = do
-- s <- B.readFile "/home/yannherklotz/Imperial/AdvancedGraphics/coursework1/CO417-Assignment1/UrbanProbe/urbanEM_latlong.pfm"
s <- B.readFile "/home/yannherklotz/Downloads/memorial.pfm"
-- BL.writeFile "random.ppm" . encodePPM . clampImage . parse $ s
BL.writeFile "circle.ppm" . encodePPM . clampImage $ circleImage 511
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