You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
37 lines
857 B
37 lines
857 B
exports = function(rgb) {
|
|
var r = rgb[0] / 255;
|
|
var g = rgb[1] / 255;
|
|
var b = rgb[2] / 255;
|
|
var min = mMin(r, g, b);
|
|
var max = mMax(r, g, b);
|
|
var delta = max - min;
|
|
var h;
|
|
var s;
|
|
if (max === min) {
|
|
h = 0;
|
|
} else if (r === max) {
|
|
h = (g - b) / delta;
|
|
} else if (g === max) {
|
|
h = 2 + (b - r) / delta;
|
|
} else {
|
|
h = 4 + (r - g) / delta;
|
|
}
|
|
h = mMin(h * 60, 360);
|
|
if (h < 0) h += 360;
|
|
var l = (min + max) / 2;
|
|
if (max === min) {
|
|
s = 0;
|
|
} else if (l <= 0.5) {
|
|
s = delta / (max + min);
|
|
} else {
|
|
s = delta / (2 - max - min);
|
|
}
|
|
var ret = [round(h), round(s * 100), round(l * 100)];
|
|
if (rgb[3]) ret[3] = rgb[3];
|
|
return ret;
|
|
};
|
|
var mMin = Math.min;
|
|
var mMax = Math.max;
|
|
var round = Math.round;
|
|
|
|
module.exports = exports;
|
|
|