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| 1 | <?php |
| 2 | |
| 3 | /** |
| 4 | * Initial cover text layer |
| 5 | * |
| 6 | * PHP version 8 |
| 7 | * |
| 8 | * Copyright (C) Villanova University 2018. |
| 9 | * |
| 10 | * This program is free software; you can redistribute it and/or modify |
| 11 | * it under the terms of the GNU General Public License version 2, |
| 12 | * as published by the Free Software Foundation. |
| 13 | * |
| 14 | * This program is distributed in the hope that it will be useful, |
| 15 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 16 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 17 | * GNU General Public License for more details. |
| 18 | * |
| 19 | * You should have received a copy of the GNU General Public License |
| 20 | * along with this program; if not, write to the Free Software |
| 21 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
| 22 | * |
| 23 | * @category VuFind |
| 24 | * @package Cover_Generator |
| 25 | * @author Demian Katz <demian.katz@villanova.edu> |
| 26 | * @license http://opensource.org/licenses/gpl-2.0.php GNU General Public License |
| 27 | * @link https://vufind.org/wiki/development:plugins:hierarchy_components Wiki |
| 28 | */ |
| 29 | |
| 30 | namespace VuFind\Cover\Layer; |
| 31 | |
| 32 | /** |
| 33 | * Initial cover text layer |
| 34 | * |
| 35 | * @category VuFind |
| 36 | * @package Cover_Generator |
| 37 | * @author Demian Katz <demian.katz@villanova.edu> |
| 38 | * @license http://opensource.org/licenses/gpl-2.0.php GNU General Public License |
| 39 | * @link https://vufind.org/wiki/development:plugins:hierarchy_components Wiki |
| 40 | */ |
| 41 | class InitialText extends AbstractTextLayer |
| 42 | { |
| 43 | /** |
| 44 | * Render the layer |
| 45 | * |
| 46 | * @param resource $im Image resource to draw on |
| 47 | * @param array $details Cover details array (with title/author/call_number) |
| 48 | * @param object $settings Settings object |
| 49 | * |
| 50 | * @return void |
| 51 | */ |
| 52 | public function render($im, $details, $settings) |
| 53 | { |
| 54 | // Get the first letter of title or author... |
| 55 | $initial = mb_substr($details['title'] . $details['author'], 0, 1, 'UTF-8'); |
| 56 | |
| 57 | // Get the height of a character with no descenders: |
| 58 | $heightWithoutDescenders |
| 59 | = $this->textHeight('O', $settings->titleFont, $settings->titleFontSize); |
| 60 | |
| 61 | // Get the height of the currently selected character: |
| 62 | $textHeight = $this |
| 63 | ->textHeight($initial, $settings->titleFont, $settings->titleFontSize); |
| 64 | |
| 65 | // Draw the letter... Note that the way we are using $textHeight and |
| 66 | // $heightWithoutDescenders is something of a fudge driven by the fact |
| 67 | // that PHP measures text in total pixels, but positions text using the |
| 68 | // baseline (thus not accounting for descenders). To truly vertically |
| 69 | // center something, we need more information than we can get without |
| 70 | // using an extension or library to read more information from the font |
| 71 | // file. The formula here is not particularly well-informed but seems |
| 72 | // to produce acceptable results for many scenarios. |
| 73 | $this->drawText( |
| 74 | $im, |
| 75 | $settings, |
| 76 | $initial, |
| 77 | $heightWithoutDescenders + ($settings->height - $textHeight) / 2, |
| 78 | $settings->titleFont, |
| 79 | $settings->titleFontSize, |
| 80 | $this->getColor($im, $settings->titleFillColor), |
| 81 | $this->getColor($im, $settings->titleBorderColor), |
| 82 | $settings->textAlign |
| 83 | ); |
| 84 | } |
| 85 | } |