Crop Page
This demo update the page boundaries of a PDF page to simulate a cropping process.
The invisible content does still exists but is simply not part of the page boundary boxes anymore.
PHP
<?php
// load and register the autoload function
require_once __DIR__ . '/../../../../../bootstrap.php';
$rectColors = [
'red' => '"red" rect',
'blue' => '"blue" rect',
'yellow' => '"yellow" rect',
'green' => '"green" rect'
];
$rectColor = displaySelect('Crop to:', $rectColors);
// create a writer instance
$writer = new \SetaPDF_Core_Writer_Http('cropped.pdf', true);
// create a document instance
$document = \SetaPDF_Core_Document::loadByFilename($assetsDirectory . '/pdfs/misc/4-rects.pdf', $writer);
// get the pages helper
$pages = $document->getCatalog()->getPages();
// get access to page #1
$page = $pages->getPage(1);
// this is a hard value
$margin = 36;
// calculate the areas of each rect by some logic
$format = $page->getWidthAndHeight();
$position = [
'red' => [$margin, $format[1] / 2, $format[0] / 2, $format[1] - $margin],
'blue' => [$format[0] / 2 + $margin, $format[1] / 2, $format[0] - $margin, $format[1] - $margin],
'yellow' => [$margin, $margin, $format[0] / 2, $format[1] / 2],
'green' => [$format[0] / 2, $margin, $format[0] - $margin, $format[1] / 2],
];
// resize all available page boxes
foreach (\SetaPDF_Core_PageBoundaries::$all AS $boxName) {
$box = $page->getBoundary($boxName, false);
if ($box === false) {
continue;
}
// reset the box to the new calculated value
$page->setBoundary($position[$rectColor], $boxName, false);
}
$document->save()->finish();