| 1 | <?php |
| 2 | /* |
| 3 | +--------------------------------------------------------------------+ |
| 4 | | CiviCRM version 5 | |
| 5 | +--------------------------------------------------------------------+ |
| 6 | | Copyright CiviCRM LLC (c) 2004-2018 | |
| 7 | +--------------------------------------------------------------------+ |
| 8 | | This file is a part of CiviCRM. | |
| 9 | | | |
| 10 | | CiviCRM is free software; you can copy, modify, and distribute it | |
| 11 | | under the terms of the GNU Affero General Public License | |
| 12 | | Version 3, 19 November 2007 and the CiviCRM Licensing Exception. | |
| 13 | | | |
| 14 | | CiviCRM is distributed in the hope that it will be useful, but | |
| 15 | | WITHOUT ANY WARRANTY; without even the implied warranty of | |
| 16 | | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. | |
| 17 | | See the GNU Affero General Public License for more details. | |
| 18 | | | |
| 19 | | You should have received a copy of the GNU Affero General Public | |
| 20 | | License and the CiviCRM Licensing Exception along | |
| 21 | | with this program; if not, contact CiviCRM LLC | |
| 22 | | at info[AT]civicrm[DOT]org. If you have questions about the | |
| 23 | | GNU Affero General Public License or the licensing of CiviCRM, | |
| 24 | | see the CiviCRM license FAQ at http://civicrm.org/licensing | |
| 25 | +--------------------------------------------------------------------+ |
| 26 | */ |
| 27 | |
| 28 | /** |
| 29 | * |
| 30 | * @package CRM |
| 31 | * @copyright CiviCRM LLC (c) 2004-2018 |
| 32 | */ |
| 33 | |
| 34 | /** |
| 35 | * Static utility functions for working with colors |
| 36 | */ |
| 37 | class CRM_Utils_Color { |
| 38 | |
| 39 | /** |
| 40 | * Determine the appropriate text color for a given background. |
| 41 | * |
| 42 | * Based on YIQ value. |
| 43 | * |
| 44 | * @param string $hexcolor |
| 45 | * @return string |
| 46 | */ |
| 47 | public static function getContrast($hexcolor) { |
| 48 | $hexcolor = trim($hexcolor, ' #'); |
| 49 | $r = hexdec(substr($hexcolor, 0, 2)); |
| 50 | $g = hexdec(substr($hexcolor, 2, 2)); |
| 51 | $b = hexdec(substr($hexcolor, 4, 2)); |
| 52 | $yiq = (($r * 299) + ($g * 587) + ($b * 114)) / 1000; |
| 53 | return ($yiq >= 128) ? 'black' : 'white'; |
| 54 | } |
| 55 | |
| 56 | } |