diff options
author | Eduardo Julian | 2017-08-21 23:37:30 -0400 |
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committer | Eduardo Julian | 2017-08-21 23:37:30 -0400 |
commit | b081ce6741fb6796daeed216d4ffce948368abf3 (patch) | |
tree | 1368a8d0ddc2c2fe9af6ee2a6f683ce528597a7e /stdlib/source | |
parent | 19395f5184abf1f8a61fe31d436e0d743854f79e (diff) |
- Added module for color computations.
Diffstat (limited to 'stdlib/source')
-rw-r--r-- | stdlib/source/lux/data/color.lux | 306 |
1 files changed, 306 insertions, 0 deletions
diff --git a/stdlib/source/lux/data/color.lux b/stdlib/source/lux/data/color.lux new file mode 100644 index 000000000..f4799726f --- /dev/null +++ b/stdlib/source/lux/data/color.lux @@ -0,0 +1,306 @@ +(;module: + lux + (lux (control [eq]) + (data (coll [list "L/" Functor<List>])) + [math] + (type opaque))) + +(def: rgb Nat +256) +(def: top Nat (n.dec rgb)) + +(def: nat-to-real (-> Nat Real) (|>. nat-to-int int-to-real)) +(def: real-to-nat (-> Real Nat) (|>. real-to-int int-to-nat)) + +(def: rgb-factor Real (nat-to-real top)) + +(def: scale-down + (-> Nat Real) + (|>. nat-to-real (r./ rgb-factor))) + +(def: scale-up + (-> Real Nat) + (|>. (r.* rgb-factor) real-to-nat)) + +(opaque: #export Color {} + {#red Nat + #green Nat + #blue Nat} + + (def: #export (color [red green blue]) + (-> [Nat Nat Nat] Color) + (@opaque [(n.% rgb red) + (n.% rgb green) + (n.% rgb blue)])) + + (def: #export unpack + (-> Color [Nat Nat Nat]) + (|>. @repr)) + + (struct: #export _ (eq;Eq Color) + (def: (= reference sample) + (let [[rr rg rb] (@repr reference) + [sr sg sb] (@repr sample)] + (and (n.= rr sr) + (n.= rg sg) + (n.= rb sb))))) + ) + +(def: #export (to-hsl color) + (-> Color [Real Real Real]) + (let [[red green blue] (unpack color) + red (scale-down red) + green (scale-down green) + blue (scale-down blue) + max ($_ r.max red green blue) + min ($_ r.min red green blue) + luminance (|> (r.+ max min) (r./ 2.0))] + (if (r.= max min) + ## Achromatic + [0.0 0.0 luminance] + ## Chromatic + (let [diff (|> max (r.- min)) + saturation (|> diff + (r./ (if (r.> 0.5 luminance) + (|> 2.0 (r.- max) (r.- min)) + (|> max (r.+ min))))) + hue' (cond (r.= red max) + (|> green (r.- blue) (r./ diff) + (r.+ (if (r.< blue green) 6.0 0.0))) + + (r.= green max) + (|> blue (r.- red) (r./ diff) + (r.+ 2.0)) + + ## (r.= blue max) + (|> red (r.- green) (r./ diff) + (r.+ 4.0)))] + [(|> hue' (r./ 6.0)) + saturation + luminance])))) + +(def: (hue-to-rgb p q t) + (-> Real Real Real Real) + (let [t (cond (r.< 0.0 t) (r.+ 1.0 t) + (r.> 1.0 t) (r.- 1.0 t) + ## else + t) + f2/3 (r./ 3.0 2.0)] + (cond (r.< (r./ 6.0 1.0) t) + (|> q (r.- p) (r.* 6.0) (r.* t) (r.+ p)) + + (r.< (r./ 2.0 1.0) t) + q + + (r.< f2/3 t) + (|> q (r.- p) (r.* (|> f2/3 (r.- t))) (r.* 6.0) (r.+ p)) + + ## else + p))) + +(def: #export (from-hsl [hue saturation luminance]) + (-> [Real Real Real] Color) + (if (r.= 0.0 saturation) + ## Achromatic + (let [intensity (scale-up luminance)] + (color [intensity intensity intensity])) + ## Chromatic + (let [q (if (r.< 0.5 luminance) + (|> saturation (r.+ 1.0) (r.* luminance)) + (|> luminance (r.+ saturation) (r.- (r.* saturation luminance)))) + p (|> luminance (r.* 2.0) (r.- q)) + third (|> 1.0 (r./ 3.0))] + (color [(scale-up (|> hue (r.+ third) (hue-to-rgb p q))) + (scale-up (|> hue (hue-to-rgb p q))) + (scale-up (|> hue (r.- third) (hue-to-rgb p q)))])))) + +(def: #export (to-hsb color) + (-> Color [Real Real Real]) + (let [[red green blue] (unpack color) + red (scale-down red) + green (scale-down green) + blue (scale-down blue) + max ($_ r.max red green blue) + min ($_ r.min red green blue) + brightness max + diff (|> max (r.- min)) + saturation (if (r.= 0.0 max) + 0.0 + (|> diff (r./ max)))] + (if (r.= max min) + ## Achromatic + [0.0 saturation brightness] + ## Chromatic + (let [hue (cond (r.= red max) + (|> green (r.- blue) (r./ diff) + (r.+ (if (r.< blue green) 6.0 0.0))) + + (r.= green max) + (|> blue (r.- red) (r./ diff) + (r.+ 2.0)) + + ## (r.= blue max) + (|> red (r.- green) (r./ diff) + (r.+ 4.0)))] + [(|> hue (r./ 6.0)) + saturation + brightness])))) + +(def: #export (from-hsb [hue saturation brightness]) + (-> [Real Real Real] Color) + (let [hue (|> hue (r.* 6.0)) + i (math;floor hue) + f (|> hue (r.- i)) + p (|> 1.0 (r.- saturation) (r.* brightness)) + q (|> 1.0 (r.- (r.* f saturation)) (r.* brightness)) + t (|> 1.0 (r.- (|> 1.0 (r.- f) (r.* saturation))) (r.* brightness)) + v brightness + mod (|> i (r.% 6.0) real-to-nat) + red (case mod +0 v +1 q +2 p +3 p +4 t +5 v _ (undefined)) + green (case mod +0 t +1 v +2 v +3 q +4 p +5 p _ (undefined)) + blue (case mod +0 p +1 p +2 t +3 v +4 v +5 q _ (undefined))] + (color [(scale-up red) + (scale-up green) + (scale-up blue)]))) + +(def: #export (to-cmyk color) + (-> Color [Real Real Real Real]) + (let [[red green blue] (unpack color) + red (scale-down red) + green (scale-down green) + blue (scale-down blue) + key (|> 1.0 (r.- ($_ r.max red green blue))) + f (if (r.< 1.0 key) + (|> 1.0 (r./ (|> 1.0 (r.- key)))) + 0.0) + cyan (|> 1.0 (r.- red) (r.- key) (r.* f)) + magenta (|> 1.0 (r.- green) (r.- key) (r.* f)) + yellow (|> 1.0 (r.- blue) (r.- key) (r.* f))] + [cyan magenta yellow key])) + +(def: #export (from-cmyk [cyan magenta yellow key]) + (-> [Real Real Real Real] Color) + (if (r.= 1.0 key) + (color [+0 +0 +0]) + (let [red (|> (|> 1.0 (r.- cyan)) + (r.* (|> 1.0 (r.- key)))) + green (|> (|> 1.0 (r.- magenta)) + (r.* (|> 1.0 (r.- key)))) + blue (|> (|> 1.0 (r.- yellow)) + (r.* (|> 1.0 (r.- key))))] + (color [(scale-up red) (scale-up green) (scale-up blue)])))) + +(def: (normalize ratio) + (-> Real Real) + (cond (r.> 1.0 ratio) + (r.% 1.0 ratio) + + (r.< 0.0 ratio) + (|> 1.0 (r.+ (r.% 1.0 ratio))) + + ## else + ratio)) + +(def: #export (interpolate ratio end start) + (-> Real Color Color Color) + (let [dS (normalize ratio) + dE (|> 1.0 (r.- dS)) + interpolate' (: (-> Nat Nat Nat) + (function [end start] + (real-to-nat (r.+ (r.* dE (nat-to-real end)) + (r.* dS (nat-to-real start)))))) + [redS greenS blueS] (unpack start) + [redE greenE blueE] (unpack end)] + (color [(interpolate' redE redS) + (interpolate' greenE greenS) + (interpolate' blueE blueS)]))) + +(def: black Color (color [+0 +0 +0])) +(def: white Color (color [top top top])) + +(do-template [<name> <target>] + [(def: #export (<name> ratio color) + (-> Real Color Color) + (interpolate ratio <target> color))] + + [darker black] + [brighter white] + ) + +(def: #export (complement color) + (-> Color Color) + (let [[red green blue] (unpack color) + adjust (function [value] (|> top (n.- value)))] + (;;color [(adjust red) + (adjust green) + (adjust blue)]))) + +(do-template [<name> <op>] + [(def: #export (<name> ratio color) + (-> Real Color Color) + (let [[hue saturation luminance] (to-hsl color)] + (from-hsl [hue + (|> saturation + (r.* (|> 1.0 (<op> (normalize ratio)))) + (r.min 1.0)) + luminance])))] + + [saturate r.+] + [de-saturate r.-] + ) + +(def: #export (gray-scale color) + (-> Color Color) + (let [[_ _ luminance] (to-hsl color)] + (from-hsl [0.0 0.0 luminance]))) + +(do-template [<name> <1> <2>] + [(def: #export (<name> color) + (-> Color [Color Color Color]) + (let [[hue saturation luminance] (to-hsl color)] + [color + (from-hsl [(|> hue (r.+ <1>) normalize) saturation luminance]) + (from-hsl [(|> hue (r.+ <2>) normalize) saturation luminance])]))] + + [triad (|> 1.0 (r./ 3.0)) (|> 2.0 (r./ 3.0))] + [clash (|> 1.0 (r./ 4.0)) (|> 3.0 (r./ 4.0))] + [split-complement (|> 1.0 (r./ 5.0)) (|> 3.0 (r./ 5.0))] + ) + +(do-template [<name> <1> <2> <3>] + [(def: #export (<name> color) + (-> Color [Color Color Color Color]) + (let [[hue saturation luminance] (to-hsl color)] + [color + (from-hsl [(|> hue (r.+ <1>) normalize) saturation luminance]) + (from-hsl [(|> hue (r.+ <2>) normalize) saturation luminance]) + (from-hsl [(|> hue (r.+ <3>) normalize) saturation luminance])]))] + + [square (|> 1.0 (r./ 4.0)) (|> 2.0 (r./ 4.0)) (|> 3.0 (r./ 4.0))] + [tetradic (|> 2.0 (r./ 12.0)) (|> 6.0 (r./ 12.0)) (|> 8.0 (r./ 12.0))] + ) + +(def: #export (analogous results slice color) + (-> Nat Real Color (List Color)) + (if (n.= +0 results) + (list) + (let [[hue saturation luminance] (to-hsl color) + slice (normalize slice)] + (L/map (function [idx] + (from-hsl [(|> idx nat-to-real (r.* slice) (r.+ hue) normalize) + saturation + luminance])) + (list;n.range +0 (n.dec results)))))) + +(def: #export (monochromatic results color) + (-> Nat Color (List Color)) + (if (n.= +0 results) + (list) + (let [[hue saturation brightness] (to-hsb color) + slice (|> 1.0 (r./ (nat-to-real results)))] + (|> (list;n.range +0 (n.dec results)) + (L/map (|>. nat-to-real + (r.* slice) + (r.+ brightness) + normalize + [hue saturation] + from-hsb)))))) |