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Fix accentDifference criterion for palette generation (#123)

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The previous code to calculate the accentDifference for the fitness
considered cases where a=b, so the minimal difference was always 0.

The new code explicitly excludes the index, so a != b (except both
entries were sampled to the same color, but that is what we want to
punish here).
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Carl Richard Theodor Schneider 2023-07-07 14:55:10 +02:00 committed by GitHub
parent fea4469ce1
commit c354350b9a
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1 changed files with 6 additions and 3 deletions
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9
palette-generator/Stylix/Palette.hs
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@ -6,6 +6,7 @@ import Ai.Evolutionary ( Species(..) )
import Codec.Picture ( Image(imageWidth, imageHeight), PixelRGB8(PixelRGB8), pixelAt )
import Data.Bifunctor ( second )
import Data.Colour ( LAB(lightness), RGB(RGB), deltaE, rgb2lab )
import Data.List ( delete )
import Data.Vector ( (//) )
import qualified Data.Vector as V
import System.Random ( RandomGen, randomR )
@ -71,9 +72,11 @@ instance (Floating a, Real a) => Species (String, (Image PixelRGB8)) (V.Vector (
-- The accent colours should be as different as possible.
accentDifference = minimum $ do
a <- accent palette
b <- accent palette
return $ deltaE a b
index_x <- [0 .. (V.length $ accent palette) - 1]
index_y <- delete index_x [0 .. (V.length $ accent palette) - 1]
let x = (V.!) (accent palette) index_x
let y = (V.!) (accent palette) index_y
return $ (deltaE x y)
-- Helpers for the function below.
lightnesses = V.map lightness palette