/
color.opa
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color.opa
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/*
Copyright © 2011 MLstate
This file is part of OPA.
OPA is free software: you can redistribute it and/or modify it under the
terms of the GNU Affero General Public License, version 3, as published by
the Free Software Foundation.
OPA is distributed in the hope that it will be useful, but WITHOUT ANY
WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
FOR A PARTICULAR PURPOSE. See the GNU Affero General Public License for
more details.
You should have received a copy of the GNU Affero General Public License
along with OPA. If not, see <http://www.gnu.org/licenses/>.
*/
/**
* Colors management
*/
package stdlib.core.color
import stdlib.core.parser
/**
* {1 About this module}
*
* {1 Where should I start ?}
*
* {1 What if I need more?}
*/
/**
* {1 Types defined in this module}
*/
type color = Color.color
type Color.color = { r : int ; g : int ; b : int ; a : int}
type Color.color_hsv = {h:float s:float v:float}
/**
* {1 Interface}
*/
Color = {{
// from http://mjijackson.com/2008/02/rgb-to-hsl-and-rgb-to-hsv-color-model-conversion-algorithms-in-javascript
to_hsv(c : Color.color) : Color.color_hsv =
(r, g, b) = (Float.of_int(c.r), Float.of_int(c.g), Float.of_int(c.b));
r = r/255.; g = g/255.; b = b/255.;
max = max(r, max(g, b)); min = min(r, min(g, b));
(h, _s, v) = (max, max, max);
d = max - min;
s = if (max == 0.) then 0. else d / max;
h =
if(max == min)
then
0. // achromatic
else
h = if (max == r)
then (g - b) / d + (if (g < b) then 6. else 0.)
else if (max == g)
then (b - r) / d + 2.
else if (max == b)
then (r - g) / d + 4.
else h
h / 6.
{~h ~s ~v} : Color.color_hsv;
of_hsv({h=h s=s v=v} : Color.color_hsv) : Color.color =
if ( s == 0. ) //HSV from 0 to 1
then
vi = Int.of_float(v * 255.)
{r=vi g=vi b=vi a= 255}
else
vh = h * 6.
vh = if ( vh == 6. ) then 0. else vh //H must be < 1
vi =Float.floor( vh ) //Or ... var_i = floor( var_h )
v1 = v * ( 1. - s )
v2 = v * ( 1. - s * ( vh - vi ) )
v3 = v * ( 1. - s * ( 1. - ( vh - vi ) ) )
(r,g,b) = match Int.of_float(vi) with
| 0 -> (v,v3,v1)
| 1 -> (v2,v,v1)
| 2 -> (v1,v,v3)
| 3 -> (v1,v2,v)
| 4 -> (v3,v1,v)
| _ -> (v,v1,v2)
end
{r = Int.of_float(r * 255.) //RGB results from 0 to 255
g = Int.of_float(g * 255.)
b = Int.of_float(b * 255.)
a = 255}
@private
color_value(x : int) : int =
if x < 0 then 0
else if x > 255 then 255
else x
color_to_string(c:color) =
match c.a with
| 0 -> "transparent"
| 255 -> "rgb({color_value(c.r)},{color_value(c.g)},{color_value(c.b)})"
| _ -> "rgba({color_value(c.r)},{color_value(c.g)},{color_value(c.b)},{color_value(c.a)/255})"
of_string : string -> option(color) =
Parser.try_parse(color_parser, _)
// FIXME: this duplicates functionality of opalang/syntax/css.trx
color_parser = parser
| r = color_hexa_parser -> r
| r = color_rgb_parser -> r
| r = color_name_parser -> r
@private
color_hexa_parser =
hc1 = parser v1=Rule.hexadecimal -> v1 * 17 // hint: 16 + 1
hc2 = parser v1=Rule.hexadecimal v2=Rule.hexadecimal -> v1*16 + v2
parser
| "#" r=hc2 g=hc2 b=hc2 a=hc2 -> rgba(r,g,b,a)
| "#" r=hc2 g=hc2 b=hc2 -> rgb(r,g,b)
| "#" r=hc1 g=hc1 b=hc1 a=hc1 -> rgba(r,g,b,a)
| "#" r=hc1 g=hc1 b=hc1 -> rgb(r,g,b)
@private
color_rgb_parser = parser
| "rgb(" Rule.ws r = Rule.byte Rule.ws "," Rule.ws g = Rule.byte Rule.ws "," Rule.ws b = Rule.byte Rule.ws ")" -> rgb(r,g,b)
| "rgba(" Rule.ws r = Rule.byte Rule.ws "," Rule.ws g = Rule.byte Rule.ws "," Rule.ws b = Rule.byte Rule.ws "," Rule.ws a = Rule.float_0_1 Rule.ws ")" -> rgba(r,g,b,Float.to_int(a*255.))
@private
color_name_parser = parser
| "yellowgreen" -> yellowgreen
| "yellow" -> yellow
| "whitesmoke" -> whitesmoke
| "white" -> white
| "wheat" -> wheat
| "violet" -> violet
| "turquoise" -> turquoise
| "transparent" -> transparent
| "tomato" -> tomato
| "thistle" -> thistle
| "teal" -> teal
| "tan" -> tan
| "steelblue" -> steelblue
| "springgreen" -> springgreen
| "snow" -> snow
| "slategray" -> slategray
| "slateblue" -> slateblue
| "skyblue" -> skyblue
| "silver" -> silver
| "sienna" -> sienna
| "seashell" -> seashell
| "seagreen" -> seagreen
| "sandybrown" -> sandybrown
| "salmon" -> salmon
| "saddlebrown" -> saddlebrown
| "royalblue" -> royalblue
| "rosybrown" -> rosybrown
| "red" -> red
| "purple" -> purple
| "powderblue" -> powderblue
| "plum" -> plum
| "pink" -> pink
| "peru" -> peru
| "peachpuff" -> peachpuff
| "papayawhip" -> papayawhip
| "palevioletred" -> palevioletred
| "paleturquoise" -> paleturquoise
| "palegreen" -> palegreen
| "palegoldenrod" -> palegoldenrod
| "orchid" -> orchid
| "orangered" -> orangered
| "orange" -> orange
| "olivedrab" -> olivedrab
| "olive" -> olive
| "oldlace" -> oldlace
| "navy" -> navy
| "navajowhite" -> navajowhite
| "moccasin" -> moccasin
| "mistyrose" -> mistyrose
| "mintcream" -> mintcream
| "midnightblue" -> midnightblue
| "mediumvioletred" -> mediumvioletred
| "mediumturquoise" -> mediumturquoise
| "mediumspringgreen" -> mediumspringgreen
| "mediumslateblue" -> mediumslateblue
| "mediumseagreen" -> mediumseagreen
| "mediumpurple" -> mediumpurple
| "mediumorchid" -> mediumorchid
| "mediumblue" -> mediumblue
| "mediumaquamarine" -> mediumaquamarine
| "maroon" -> maroon
| "magenta" -> magenta
| "linen" -> linen
| "limegreen" -> limegreen
| "lime" -> lime
| "lightyellow" -> lightyellow
| "lightsteelblue" -> lightsteelblue
| "lightslategray" -> lightslategray
| "lightskyblue" -> lightskyblue
| "lightseagreen" -> lightseagreen
| "lightsalmon" -> lightsalmon
| "lightpink" -> lightpink
| "lightgreen" -> lightgreen
| "lightgrey" -> lightgrey
| "lightgoldenrodyellow" -> lightgoldenrodyellow
| "lightcyan" -> lightcyan
| "lightcoral" -> lightcoral
| "lightblue" -> lightblue
| "lemonchiffon" -> lemonchiffon
| "lawngreen" -> lawngreen
| "lavenderblush" -> lavenderblush
| "lavender" -> lavender
| "khaki" -> khaki
| "ivory" -> ivory
| "indigo" -> indigo
| "indianred" -> indianred
| "hotpink" -> hotpink
| "honeydew" -> honeydew
| "greenyellow" -> greenyellow
| "green" -> green
| "gray" -> gray
| "goldenrod" -> goldenrod
| "gold" -> gold
| "ghostwhite" -> ghostwhite
| "gainsboro" -> gainsboro
| "fuchsia" -> fuchsia
| "forestgreen" -> forestgreen
| "floralwhite" -> floralwhite
| "firebrick" -> firebrick
| "dodgerblue" -> dodgerblue
| "dimgray" -> dimgray
| "deepskyblue" -> deepskyblue
| "deeppink" -> deeppink
| "darkviolet" -> darkviolet
| "darkturquoise" -> darkturquoise
| "darkslategray" -> darkslategray
| "darkslateblue" -> darkslateblue
| "darkseagreen" -> darkseagreen
| "darksalmon" -> darksalmon
| "darkred" -> darkred
| "darkorchid" -> darkorchid
| "darkorange" -> darkorange
| "darkolivegreen" -> darkolivegreen
| "darkmagenta" -> darkmagenta
| "darkkhaki" -> darkkhaki
| "darkgreen" -> darkgreen
| "darkgray" -> darkgray
| "darkgoldenrod" -> darkgoldenrod
| "darkcyan" -> darkcyan
| "darkblue" -> darkblue
| "cyan" -> cyan
| "crimson" -> crimson
| "cornsilk" -> cornsilk
| "cornflowerblue" -> cornflowerblue
| "coral" -> coral
| "chocolate" -> chocolate
| "chartreuse" -> chartreuse
| "cadetblue" -> cadetblue
| "burlywood" -> burlywood
| "brown" -> brown
| "blueviolet" -> blueviolet
| "blue" -> blue
| "blanchedalmond" -> blanchedalmond
| "black" -> black
| "bisque" -> bisque
| "beige" -> beige
| "azure" -> azure
| "aquamarine" -> aquamarine
| "aqua" -> aqua
| "antiquewhite" -> antiquewhite
| "aliceblue" -> aliceblue
rgba(r, g, b, a) : color =
r = color_value(r)
g = color_value(g)
b = color_value(b)
a = color_value(a)
{~r ~g ~b ~a}
rgb(r, g, b) : color=
rgba(r, g, b, 255)
r(c:color) = c.r
g(c:color) = c.g
b(c:color) = c.b
a(c:color) = c.a
set_r(c, v) = {c:color with r = color_value(v)}
set_g(c, v) = {c:color with g = color_value(v)}
set_b(c, v) = {c:color with b = color_value(v)}
set_a(c, v) = {c:color with a = color_value(v)}
transparent = rgba(0,0,0,0)
aliceblue = rgb(240, 248, 255)
antiquewhite = rgb(250, 235, 215)
aqua = rgb( 0, 255, 255)
aquamarine = rgb(127, 255, 212)
azure = rgb(240, 255, 255)
beige = rgb(245, 245, 220)
bisque = rgb(255, 228, 196)
black = rgb( 0, 0, 0)
blanchedalmond = rgb(255, 235, 205)
blue = rgb( 0, 0, 255)
blueviolet = rgb(138, 43, 226)
brown = rgb(165, 42, 42)
burlywood = rgb(222, 184, 135)
cadetblue = rgb( 95, 158, 160)
chartreuse = rgb(127, 255, 0)
chocolate = rgb(210, 105, 30)
coral = rgb(255, 127, 80)
cornflowerblue = rgb(100, 149, 237)
cornsilk = rgb(255, 248, 220)
crimson = rgb(220, 20, 60)
cyan = rgb( 0, 255, 255)
darkblue = rgb( 0, 0, 139)
darkcyan = rgb( 0, 139, 139)
darkgoldenrod = rgb(184, 134, 11)
darkgray = rgb(169, 169, 169)
darkgreen = rgb( 0, 100, 0)
darkkhaki = rgb(189, 183, 107)
darkmagenta = rgb(139, 0, 139)
darkolivegreen = rgb( 85, 107, 47)
darkorange = rgb(255, 140, 0)
darkorchid = rgb(153, 50, 204)
darkred = rgb(139, 0, 0)
darksalmon = rgb(233, 150, 122)
darkseagreen = rgb(143, 188, 143)
darkslateblue = rgb( 72, 61, 139)
darkslategray = rgb( 47, 79, 79)
darkturquoise = rgb( 0, 206, 209)
darkviolet = rgb(148, 0, 211)
deeppink = rgb(255, 20, 147)
deepskyblue = rgb( 0, 191, 255)
dimgray = rgb(105, 105, 105)
dodgerblue = rgb( 30, 144, 255)
firebrick = rgb(178, 34, 34)
floralwhite = rgb(255, 250, 240)
forestgreen = rgb( 34, 139, 34)
fuchsia = rgb(255, 0, 255)
gainsboro = rgb(220, 220, 220)
ghostwhite = rgb(248, 248, 255)
gold = rgb(255, 215, 0)
goldenrod = rgb(218, 165, 32)
gray = rgb(128, 128, 128)
green = rgb( 0, 128, 0)
greenyellow = rgb(173, 255, 47)
honeydew = rgb(240, 255, 240)
hotpink = rgb(255, 105, 180)
indianred = rgb(205, 92, 92)
indigo = rgb( 75, 0, 130)
ivory = rgb(255, 255, 240)
khaki = rgb(240, 230, 140)
lavender = rgb(230, 230, 250)
lavenderblush = rgb(255, 240, 245)
lawngreen = rgb(124, 252, 0)
lemonchiffon = rgb(255, 250, 205)
lightblue = rgb(173, 216, 230)
lightcoral = rgb(240, 128, 128)
lightcyan = rgb(224, 255, 255)
lightgoldenrodyellow = rgb(250, 250, 210)
lightgrey = rgb(211, 211, 211)
lightgreen = rgb(144, 238, 144)
lightpink = rgb(255, 182, 193)
lightsalmon = rgb(255, 160, 122)
lightseagreen = rgb( 32, 178, 170)
lightskyblue = rgb(135, 206, 250)
lightslategray = rgb(119, 136, 153)
lightsteelblue = rgb(176, 196, 222)
lightyellow = rgb(255, 255, 224)
lime = rgb( 0, 255, 0)
limegreen = rgb( 50, 205, 50)
linen = rgb(250, 240, 230)
magenta = rgb(255, 0, 255)
maroon = rgb(128, 0, 0)
mediumaquamarine = rgb(102, 205, 170)
mediumblue = rgb( 0, 0, 205)
mediumorchid = rgb(186, 85, 211)
mediumpurple = rgb(147, 112, 216)
mediumseagreen = rgb( 60, 179, 113)
mediumslateblue = rgb(123, 104, 238)
mediumspringgreen = rgb( 0, 250, 154)
mediumturquoise = rgb( 72, 209, 204)
mediumvioletred = rgb(199, 21, 133)
midnightblue = rgb( 25, 25, 112)
mintcream = rgb(245, 255, 250)
mistyrose = rgb(255, 228, 225)
moccasin = rgb(255, 228, 181)
navajowhite = rgb(255, 222, 173)
navy = rgb( 0, 0, 128)
oldlace = rgb(253, 245, 230)
olive = rgb(128, 128, 0)
olivedrab = rgb(107, 142, 35)
orange = rgb(255, 165, 0)
orangered = rgb(255, 69, 0)
orchid = rgb(218, 112, 214)
palegoldenrod = rgb(238, 232, 170)
palegreen = rgb(152, 251, 152)
paleturquoise = rgb(175, 238, 238)
palevioletred = rgb(216, 112, 147)
papayawhip = rgb(255, 239, 213)
peachpuff = rgb(255, 218, 185)
peru = rgb(205, 133, 63)
pink = rgb(255, 192, 203)
plum = rgb(221, 160, 221)
powderblue = rgb(176, 224, 230)
purple = rgb(128, 0, 128)
red = rgb(255, 0, 0)
rosybrown = rgb(188, 143, 143)
royalblue = rgb( 65, 105, 225)
saddlebrown = rgb(139, 69, 19)
salmon = rgb(250, 128, 114)
sandybrown = rgb(244, 164, 96)
seagreen = rgb( 46, 139, 87)
seashell = rgb(255, 245, 238)
sienna = rgb(160, 82, 45)
silver = rgb(192, 192, 192)
skyblue = rgb(135, 206, 235)
slateblue = rgb(106, 90, 205)
slategray = rgb(112, 128, 144)
snow = rgb(255, 250, 250)
springgreen = rgb( 0, 255, 127)
steelblue = rgb( 70, 130, 180)
tan = rgb(210, 180, 140)
teal = rgb( 0, 128, 128)
thistle = rgb(216, 191, 216)
tomato = rgb(255, 99, 71)
turquoise = rgb( 64, 224, 208)
violet = rgb(238, 130, 238)
wheat = rgb(245, 222, 179)
white = rgb(255, 255, 255)
whitesmoke = rgb(245, 245, 245)
yellow = rgb(255, 255, 0)
yellowgreen = rgb(154, 205, 50)
}}