plugins/Group_assign/Model/GroupColorExtension.php


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<?php

namespace Kanboard\Plugin\Group_assign\Model;

use Kanboard\Model\GroupModel;

class GroupColorExtension extends GroupModel
{

  public function getGroupColor($str) {
    $code = dechex(crc32($str));
    $code = substr($code, 0, 6);
    return $code;
  }
  
  public function getFontColor($hex) {
    // returns brightness value from 0 to 255
    // strip off any leading #
    $hex = str_replace('#', '', $hex);

    $c_r = hexdec(substr($hex, 0, 2));
    $c_g = hexdec(substr($hex, 2, 2));
    $c_b = hexdec(substr($hex, 4, 2));

    $brightness = (($c_r * 299) + ($c_g * 587) + ($c_b * 114)) / 1000;
    if ($brightness > 130) { return 'black'; } else { return 'white'; }
  }
}