git.iko.soy/elk
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elk/core/Native/Color.js
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2(function() {
3"use strict";
5function extract(c) {
6 if (c._3 === 1) { return 'rgb(' + c._0 + ',' + c._1 + ',' + c._2 + ')'; }
7 return 'rgba(' + c._0 + ',' + c._1 + ',' + c._2 + ',' + c._3 + ')';
8}
9function complement(rgb) {
10 var hsv = toHSV(rgb);
11 hsv.hue = (hsv.hue + 180) % 360;
12 return toRGB(hsv);
15function hsva(h) { return function(s) { return function(v) { return function(a) {
16 var clr = toRGB({hue:h, saturation:s, value:v});
17 clr._3 = a;
18 return clr;
19 }; }; };
22function hsv(h) { return function(s) { return function(v) {
23 return toRGB({hue:h, saturation:s, value:v}); }; }; }
25function toHSV(rgb) {
26 var hsv = {};
27 var r = rgb._0 / 255.0, g = rgb._1 / 255.0, b = rgb._2 / 255.0;
28 var M = Math.max(r,g,b);
29 var m = Math.min(r,g,b);
30 var c = M - m;
32 var h = 0;
33 if (c === 0) { h = 0; }
34 else if (M === r) { h = ((g - b) / c) % 6; }
35 else if (M === g) { h = ((b - r) / c) + 2; }
36 else if (M === b) { h = ((r - g) / c) + 4; }
37 h *= 60;
39 return { value : M, hue : h, saturation : (M === 0 ? 0 : c / M) };
42function between(lo,hi,x) { return lo <= x && x < hi; }
43function norm(n) { return Math.round(n*255); }
45function toRGB(hsv) {
46 var c = hsv.value * hsv.saturation;
47 var hue = hsv.hue / 60;
48 var x = c * (1 - Math.abs((hue % 2) - 1));
49 var r = 0, g = 0, b = 0;
50 if (between(0,1,hue)) { r = c; g = x; b = 0; }
51 else if (between(1,2,hue)) { r = x; g = c; b = 0; }
52 else if (between(2,3,hue)) { r = 0; g = c; b = x; }
53 else if (between(3,4,hue)) { r = 0; g = x; b = c; }
54 else if (between(4,5,hue)) { r = x; g = 0; b = c; }
55 else if (between(5,6,hue)) { r = c; g = 0; b = x; }
57 var m = hsv.value - c;
58 return { ctor:"Color", _0:norm(r+m), _1:norm(g+m), _2:norm(b+m), _3:1 };
61Elm.Native.Color = {hsva:hsva,
62 hsv:hsv,
63 complement:complement,
64 extract:extract};
65}());