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* RGB 颜色值转换为 HSL.
* - 转换公式参考自 http://en.wikipedia.org/wiki/HSL_color_space.
* - r, g, 和 b 需要在 [0, 255] 范围内
* - 返回的 h, s, 和 l 在 [0, 1] 之间
* @method util/rgbToHsl
* @param {Number} r 红色色值
* @param {Number} g 绿色色值
* @param {Number} b 蓝色色值
* @returns {Array} HSL各值数组
* @example
* var $rgbToHsl = require('@spore-ui/kit/packages/util/rgbToHsl');
* $rgbToHsl(100, 200, 250); // => [0.5555555555555555,0.9374999999999999,0.6862745098039216]
* $rgbToHsl(0, 0, 0); // => [0,0,0]
* $rgbToHsl(255, 255, 255); // => [0,0,1]
*/
function rgbToHsl(r, g, b) {
r /= 255;
g /= 255;
b /= 255;
var max = Math.max(r, g, b);
var min = Math.min(r, g, b);
var h;
var s;
var l = (max + min) / 2;
if (max === min) {
s = 0; // achromatic
h = s;
} else {
var d = max - min;
s = l > 0.5 ? d / (2 - max - min) : d / (max + min);
switch (max) {
case r: h = (g - b) / d + (g < b ? 6 : 0); break;
case g: h = (b - r) / d + 2; break;
case b: h = (r - g) / d + 4; break;
default: break;
}
h /= 6;
}
return [h, s, l];
}
module.exports = rgbToHsl;
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