<?php

namespace UCore\DcatAdmin;

class Herlper
{


    /**
     * 根据背景色获取对比色
     *
     * @param string $hexColor
     * @return string
     */
    public static function getContrastColor(string $hexColor): string
    {
        $hexColor = ltrim($hexColor, '#');
        $r = hexdec(substr($hexColor, 0, 2));
        $g = hexdec(substr($hexColor, 2, 2));
        $b = hexdec(substr($hexColor, 4, 2));
        $brightness = ($r * 299 + $g * 587 + $b * 114) / 1000;
        return $brightness > 128 ? '#000000' : '#ffffff';
    }

}