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1 | <?php |
2 | /* | |
3 | +--------------------------------------------------------------------+ | |
4 | | CiviCRM version 4.7 | | |
5 | +--------------------------------------------------------------------+ | |
0f03f337 | 6 | | Copyright CiviCRM LLC (c) 2004-2017 | |
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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 | |
0f03f337 | 31 | * @copyright CiviCRM LLC (c) 2004-2017 |
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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 | } |