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rgb.gleam
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rgb.gleam
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import gleam/float
import gleam/int
import gleam/list
import gleam/result
import gleam/string
import lumi
import util
pub fn to_hex(rgb: lumi.Rgb, with_hash: Bool) {
let prefix = case with_hash {
True -> "#"
False -> ""
}
let format = fn(x) {
float.round(x)
|> int.to_base16()
|> string.pad_left(2, "0")
}
let r = format(rgb.r)
let g = format(rgb.g)
let b = format(rgb.b)
prefix <> r <> g <> b
}
fn do_index_of(l, value, i) {
case l {
[] -> Error(Nil)
[x, ..rest] ->
case x == value {
True -> Ok(i)
False -> do_index_of(rest, value, i + 1)
}
}
}
fn index_of(l, value) {
do_index_of(l, value, 0)
}
pub fn from_hex(hex: String) -> Result(lumi.Rgb, Nil) {
let parse16 = fn(s) {
let digits = [
"0", "1", "2", "3", "4", "5", "6", "7", "8", "9", "A", "B", "C", "D", "E",
"F",
]
s
|> string.uppercase()
|> string.split("")
|> list.reverse()
|> list.map(index_of(digits, _))
|> list.index_map(fn(x, i) {
let multiplier =
int.power(16, int.to_float(i))
|> result.map(float.round)
case x, multiplier {
Ok(x), Ok(multiplier) -> Ok(x * multiplier)
_, _ -> Error(Nil)
}
})
|> list.try_fold(0, fn(acc, x) { result.map(x, int.add(_, acc)) })
}
let try = fn(s) {
s
|> parse16()
|> result.map(fn(x) {
let r =
x
|> int.bitwise_and(255)
|> int.to_float()
let g =
x
|> int.bitwise_shift_right(8)
|> int.bitwise_and(255)
|> int.to_float()
let b =
x
|> int.bitwise_shift_right(16)
|> int.bitwise_and(255)
|> int.to_float()
lumi.Rgb(r: r, g: g, b: b)
})
}
case hex {
"#" <> code -> try(code)
code -> try(code)
}
}
fn hsl_hsv_hclv(rgb: lumi.Rgb) {
let r = rgb.r /. 255.0
let g = rgb.g /. 255.0
let b = rgb.b /. 255.0
let min = list.fold([r, g, b], 1.1, float.min)
let max = list.fold([r, g, b], -0.1, float.max)
let c = max -. min
let l = { min +. max } /. 2.0
let h =
case Nil {
_ if max == r ->
{ { g -. b } /. c }
|> util.fmod(6.0)
_ if max == g -> { b -. r } /. c +. 2.0
_ if max == b -> { r -. g } /. c +. 4.0
_ -> 0.0
}
|> float.multiply(60.0)
#(h, c, l, max)
}
pub fn to_hsl(rgb: lumi.Rgb) {
let #(h, c, l, v) = hsl_hsv_hclv(rgb)
let s = case c {
_ if c <=. 0.0001 -> 0.0
_ if c >=. 0.9999 -> 0.0
_ -> c /. { 1.0 -. float.absolute_value(2.0 *. v -. c -. 1.0) }
}
lumi.Hsl(h: h, s: s *. 100.0, l: l *. 100.0)
}
pub fn to_hsv(rgb: lumi.Rgb) {
let #(h, c, _, v) = hsl_hsv_hclv(rgb)
let s = case v {
0.0 -> 0.0
_ -> c /. v
}
lumi.Hsv(h: util.wrap_to_range(h, 0.0, 360.0), s: s *. 100.0, v: v *. 100.0)
}
pub fn to_xyz(rgb: lumi.Rgb) {
let c = fn(c) {
case Nil {
_ if c <=. 0.0404 -> c /. 12.92
_ ->
float.power({ c +. 0.055 } /. 1.055, 2.4)
|> result.unwrap(0.0)
}
}
let r = c(rgb.r /. 255.0)
let g = c(rgb.g /. 255.0)
let b = c(rgb.b /. 255.0)
let x = r *. 0.4124 +. g *. 0.3576 +. b *. 0.1805
let y = r *. 0.2126 +. g *. 0.7152 +. b *. 0.0722
let z = r *. 0.0193 +. g *. 0.1192 +. b *. 0.9505
lumi.Xyz(x: x *. 100.0, y: y *. 100.0, z: z *. 100.0)
}