Lưới 2x2 sách không có bản quyền có chức năng nằm phẳng

2x2 grid, 16:9, do this for 4 non-copyrighted books: type Share = Float

data Constituent = C { name:: Text, share:: Share } -- Σ shares = 1 (R₃)

-- R₁+R₂: a partition of the shape region that preserves measure and conforms to the boundary

partition:: Region -> [Constituent] -> [SubRegion]

-- |Ω_i| = share_i - |Ω| (area‑preserving)

-- disjoint Ω_i; ∪Ω_i = Ω; ∂(∪Ω_i) = ∂Ω (shape‑conforming, clean edge)

reads_as:: Image -> (Silhouette, Recipe) -- far = the SHAPE, near = the proportions

forbidden:: [Regex]

forbidden = [ /equal_sized_parts/, /wrong_proportions/, /missing_component/, /broken_silhouette/,

 /overlap/, /tilt/, /hands/, /glare/ ]

render:: Subject -> Shape -> Image

render s sh = let d = constituents s; Ω = region sh

 in assert (sum(share <$> d)==1 && measure_preserving (partition Ω d) Ω) $

 flat_lay (partition Ω d) overhead_softbox matte soft_shadows (tiny_pct d)