378 lines
14 KiB
PHP
378 lines
14 KiB
PHP
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<?php
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/**
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* E080_no_write_regions.php
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*
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* @since 2026-06-16
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* @category Library
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* @package Pdf
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* @author Nicola Asuni <info@tecnick.com>
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* @copyright 2002-2026 Nicola Asuni - Tecnick.com LTD
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* @license https://www.gnu.org/copyleft/lesser.html GNU-LGPL v3 (see LICENSE)
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* @link https://github.com/tecnickcom/tc-lib-pdf
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*
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* This file is part of tc-lib-pdf software library.
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*
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* No-write page regions (legacy TCPDF example_064 equivalent).
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*
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* A no-write region is a portion of the page that flowing text will avoid. Each region is
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* defined exactly as in the legacy library: a vertical, possibly slanted, segment plus the
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* page side it blocks ('L' or 'R'). tc-lib-pdf-page approximates the resulting writable area
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* with a stack of rectangular regions (one per horizontal band), so text flows down the page
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* hugging the obstacle. Several adjacent segments approximate curved shapes (see the circle on
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* the second scenario). See Com\Tecnick\Pdf\Page\Region::setNoWriteRegions().
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*
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* Each obstacle scenario is rendered twice, on consecutive pages, so the two text engines can be
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* compared side by side:
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* - with addTextCell() (plain flowing text);
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* - with addHTMLCell() (HTML cell), producing the SAME visual result.
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* Both engines hug the rectangular, trapezoidal and circular obstacles band by band and, when
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* the text overflows the last region, continue on a fresh full-width page (no-write regions are
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* page-specific, so the continuation page has no obstacles).
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*
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* NOTE: the band height must be at least one text line tall; with a 12pt font (~4.9mm line
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* height) a 5mm band fits exactly one line, giving the finest (per-line) staircase.
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*/
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// NOTE: local file reads (images, fonts, attachments) are restricted to an allowlist of
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// trusted paths that covers this package tree, so run the examples in place. To read assets
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// from other locations, list them in the 'allowedPaths' entry of the fileOptions constructor
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// parameter (see E047_remote_resources_security.php).
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// NOTE: run make fonts in the project root to generate the dependencies and example fonts.
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// autoloader when using Composer
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require __DIR__ . '/../vendor/autoload.php';
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// define fonts directory
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\define('K_PATH_FONTS', \realpath(__DIR__ . '/../vendor/tecnickcom/tc-lib-pdf-font/target/fonts'));
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// autoloader when using RPM or DEB package installation
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//require ('/usr/share/php/Com/Tecnick/Pdf/autoload.php');
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// main TCPDF object
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$pdf = new \Com\Tecnick\Pdf\Tcpdf(
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unit: \Com\Tecnick\Pdf\Page\Unit::Millimeter,
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isunicode: true,
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subsetfont: false,
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compress: true,
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mode: \Com\Tecnick\Pdf\PdfConformance::None,
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objEncrypt: null,
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);
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// ----------
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$pdf->setCreator('tc-lib-pdf');
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$pdf->setAuthor('Nicola Asuni');
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$pdf->setSubject('tc-lib-pdf example: 080');
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$pdf->setTitle('No-write page regions');
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$pdf->setKeywords('TCPDF tc-lib-pdf example no-write page regions wrap text shape');
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$pdf->setPDFFilename('080_no_write_regions.pdf');
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$pdf->setViewerPreferences(['DisplayDocTitle' => true]);
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// ----------
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// Fonts (matching legacy example_064: 12pt body, small 8pt annotation labels).
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// NOTE: the font engine keeps the LAST inserted font as the current one, so each font is
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// (re)inserted with insertFont() right before it is used, making it the active font.
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$insertFont = static function (string $style, float $size) use ($pdf): void {
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$font = $pdf->font->insert($pdf->pon, 'helvetica', $style, $size);
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$pdf->page->addContent($font['out']);
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};
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// ----------
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// Colours (matching legacy example_064).
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$black = $pdf->color->getPdfColor('rgb(0,0,0)'); // titles and labels (single-line, no page break)
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$bodyBlue = 'rgb(0,0,255)'; // flowing body text (justified, as in example_064)
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// Graphic styles: light-green fill, the no-write edge in red, the other edges in grey dashed.
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$fillStyle = [
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'lineWidth' => 0.254,
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'lineCap' => 'butt',
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'lineJoin' => 'miter',
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'dashArray' => [1, 1],
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'dashPhase' => 0,
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'lineColor' => 'rgb(127,127,127)',
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'fillColor' => 'rgb(220,255,220)',
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];
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$edgeGrey = [
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'lineWidth' => 0.254,
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'lineCap' => 'butt',
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'lineJoin' => 'miter',
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'dashArray' => [1, 1],
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'dashPhase' => 0,
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'lineColor' => 'rgb(127,127,127)',
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];
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$edgeRed = [
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'lineWidth' => 0.254,
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'lineCap' => 'butt',
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'lineJoin' => 'miter',
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'dashArray' => [],
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'dashPhase' => 0,
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'lineColor' => 'rgb(255,0,0)',
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];
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$arrowStyle = [
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'lineWidth' => 0.254,
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'lineCap' => 'butt',
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'lineJoin' => 'miter',
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'dashArray' => [],
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'dashPhase' => 0,
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'lineColor' => 'rgb(0,0,0)',
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];
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// Image used as a rectangular obstacle (legacy example used images/image_demo.jpg).
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$imgFile = \realpath(__DIR__ . '/../vendor/tecnickcom/tc-lib-pdf-image/test/images/200x100_RGBICC.jpg');
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$imgId = $pdf->image->add($imgFile);
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// Flowing body text (kept blue and justified as in example_064).
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$intro =
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'TEST PAGE REGIONS: a no-write region is a portion of the page with a rectangular or '
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. 'trapezium shape that will not be covered when writing text. A region is aligned on the '
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. 'left or right side of the page and is defined using a vertical segment. You can set '
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. 'multiple regions for the same page, and combine several adjacent regions to approximate '
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. 'curved shapes.';
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$lorem =
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'Lorem ipsum dolor sit amet, consectetur adipiscing elit. In sed imperdiet lectus. Phasellus '
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. 'quis velit velit, non condimentum quam. Sed neque urna, ultrices ac volutpat vel, laoreet '
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. 'vitae augue. Sed vel velit erat. Class aptent taciti sociosqu ad litora torquent per conubia '
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. 'nostra, per inceptos himenaeos. Cras eget velit nulla, eu sagittis elit. Nunc ac arcu est, in '
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. 'lobortis tellus. Praesent condimentum rhoncus sodales. In hac habitasse platea dictumst. Proin '
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. 'porta eros pharetra enim tincidunt dignissim nec vel dolor. Cras sapien elit, ornare ac '
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. 'dignissim eu, ultricies ac eros. Maecenas augue magna, ultrices a congue in, mollis eu nulla. '
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. 'Nunc venenatis massa at est eleifend faucibus. Vivamus sed risus lectus, nec interdum nunc. '
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. 'Fusce et felis vitae diam lobortis sollicitudin. Aenean tincidunt accumsan nisi, id vehicula '
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. 'quam laoreet elementum. Phasellus egestas interdum erat, et viverra ipsum ultricies ac.';
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// More text than fits on a no-write page: with automatic page break enabled the flow continues
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// on a fresh page. No-write regions are page-specific, so that continuation page has no
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// obstacles and the text returns to the full page width.
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$body = $intro . ' ' . \str_repeat($lorem . ' ', 5);
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$margin = [
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'PL' => 15.0,
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'PR' => 15.0,
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'CT' => 25.0,
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'CB' => 12.0,
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];
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$bandHeight = 5.0;
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// =============================================================
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// Reusable building blocks, so each obstacle scenario can be rendered identically with the
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// plain-text engine (addTextCell) and the HTML engine (addHTMLCell).
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// Add a page and print its (black) title.
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$startPage = static function (string $title) use ($pdf, $margin, $black, $insertFont): array {
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$page = $pdf->addPage(['margin' => $margin]);
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$pdf->page->addContent($black);
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$insertFont('B', 13);
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$pdf->addTextCellXY(txt: $title, posx: 15, posy: 12, drawcell: false);
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return $page;
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};
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// Draw the two image obstacles plus the two trapezoids (with xt,yt / xb,yb / side labels and
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// direction arrows, as in the legacy example) and register the matching no-write regions.
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$setupTrapezoids = static function (float $pageHeight) use (
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$pdf,
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$imgId,
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$fillStyle,
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$edgeGrey,
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$edgeRed,
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$arrowStyle,
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$black,
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$insertFont,
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$bandHeight,
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): void {
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// Two image obstacles: top-right and bottom-left.
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$pdf->page->addContent($pdf->image->getSetImage($imgId, 155, 30, 40, 40, $pageHeight));
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$pdf->page->addContent($pdf->image->getSetImage($imgId, 15, 230, 40, 40, $pageHeight));
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// Left trapezoid: the slanted right edge (57,90)-(67,140) is the no-write boundary (red).
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$pdf->page->addContent($pdf->graph->getPolygon([15, 90, 57, 90, 67, 140, 15, 140, 15, 90], 'DF', [
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'all' => $fillStyle,
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0 => $edgeGrey,
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1 => $edgeRed,
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2 => $edgeGrey,
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3 => $edgeGrey,
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]));
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// Right trapezoid: the slanted left edge (155,180)-(145,130) is the no-write boundary (red).
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$pdf->page->addContent($pdf->graph->getPolygon([145, 130, 195, 130, 195, 180, 155, 180, 145, 130], 'DF', [
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'all' => $fillStyle,
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0 => $edgeGrey,
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1 => $edgeGrey,
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2 => $edgeGrey,
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3 => $edgeRed,
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]));
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// Annotation labels and direction arrows (8pt black), as in the legacy example.
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$pdf->page->addContent($black);
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$insertFont('', 8);
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$pdf->addTextCellXY(
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txt: 'xt,yt',
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posx: 38,
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posy: 90,
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width: 18,
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halign: \Com\Tecnick\Pdf\TextHAlign::Right,
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drawcell: false,
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);
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$pdf->addTextCellXY(
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txt: 'xb,yb',
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posx: 48,
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posy: 136,
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width: 18,
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halign: \Com\Tecnick\Pdf\TextHAlign::Right,
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drawcell: false,
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);
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$pdf->addTextCellXY(
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txt: 'side',
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posx: 38,
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posy: 111,
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width: 16,
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halign: \Com\Tecnick\Pdf\TextHAlign::Right,
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drawcell: false,
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);
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$pdf->page->addContent($pdf->graph->getArrow(60, 115, 40, 115, 2, 4, 15, $arrowStyle));
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$pdf->addTextCellXY(
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txt: 'xt,yt',
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posx: 147,
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posy: 130,
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width: 18,
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halign: \Com\Tecnick\Pdf\TextHAlign::Left,
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drawcell: false,
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);
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$pdf->addTextCellXY(
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txt: 'xb,yb',
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posx: 156,
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posy: 176,
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width: 18,
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halign: \Com\Tecnick\Pdf\TextHAlign::Left,
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drawcell: false,
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);
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$pdf->addTextCellXY(
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txt: 'side',
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posx: 158,
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posy: 151,
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width: 16,
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halign: \Com\Tecnick\Pdf\TextHAlign::Left,
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drawcell: false,
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);
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$pdf->page->addContent($pdf->graph->getArrow(152, 155, 172, 155, 2, 4, 15, $arrowStyle));
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// No-write regions: each is a segment (xt,yt)-(xb,yb) plus the blocked page side.
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$pdf->page->setNoWriteRegions(
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[
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['xt' => 153, 'yt' => 30, 'xb' => 153, 'yb' => 70, 'side' => 'R'], // top-right image
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['xt' => 60, 'yt' => 90, 'xb' => 70, 'yb' => 140, 'side' => 'L'], // left trapezoid
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['xt' => 143, 'yt' => 130, 'xb' => 153, 'yb' => 180, 'side' => 'R'], // right trapezoid
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['xt' => 58, 'yt' => 230, 'xb' => 58, 'yb' => 270, 'side' => 'L'], // bottom-left image
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],
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$bandHeight,
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);
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};
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// Draw the circular obstacle (left half-disc against the right content edge) traced by eight
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// adjacent right-side segments, and register the matching no-write regions.
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$setupCircle = static function () use ($pdf, $fillStyle, $bandHeight): void {
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$pdf->page->addContent($pdf->graph->getPolygon(
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[
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195,
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110,
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179.693,
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113.045,
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166.716,
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121.716,
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158.045,
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134.693,
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155,
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150,
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158.045,
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165.307,
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166.716,
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178.284,
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179.693,
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186.955,
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195,
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190,
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],
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'DF',
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['all' => $fillStyle],
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));
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$pdf->page->setNoWriteRegions([
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['xt' => 195, 'yt' => 110, 'xb' => 179.693, 'yb' => 113.045, 'side' => 'R'],
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['xt' => 179.693, 'yt' => 113.045, 'xb' => 166.716, 'yb' => 121.716, 'side' => 'R'],
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['xt' => 166.716, 'yt' => 121.716, 'xb' => 158.045, 'yb' => 134.693, 'side' => 'R'],
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['xt' => 158.045, 'yt' => 134.693, 'xb' => 155, 'yb' => 150, 'side' => 'R'],
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['xt' => 155, 'yt' => 150, 'xb' => 158.045, 'yb' => 165.307, 'side' => 'R'],
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['xt' => 158.045, 'yt' => 165.307, 'xb' => 166.716, 'yb' => 178.284, 'side' => 'R'],
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['xt' => 166.716, 'yt' => 178.284, 'xb' => 179.693, 'yb' => 186.955, 'side' => 'R'],
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['xt' => 179.693, 'yt' => 186.955, 'xb' => 195, 'yb' => 190, 'side' => 'R'],
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], $bandHeight);
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};
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// Flow the body with the plain-text engine. width 0 makes each band use its own writable width.
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// The fill colour is set through the graph so it is tracked and re-applied automatically when the
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// flow continues on an automatically added page (the colour resets per page).
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$renderTextBody = static function () use ($pdf, $body, $bodyBlue, $insertFont): void {
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$pdf->page->addContent($pdf->graph->add(['fillColor' => $bodyBlue]));
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$insertFont('', 12);
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|
$pdf->addTextCell(
|
||
|
|
txt: $body,
|
||
|
|
posx: 0,
|
||
|
|
posy: 0,
|
||
|
|
width: 0,
|
||
|
|
halign: \Com\Tecnick\Pdf\TextHAlign::Justify,
|
||
|
|
drawcell: false,
|
||
|
|
);
|
||
|
|
};
|
||
|
|
|
||
|
|
// Flow the SAME body with the HTML engine. A single justified, coloured paragraph hugs the
|
||
|
|
// obstacle band by band exactly like addTextCell, and overflows onto a fresh full-width page.
|
||
|
|
// A font must be active before addHTMLCell(). getHTMLCell() returns the same rendering as a
|
||
|
|
// string instead of emitting it (e.g. $code = $pdf->getHTMLCell(...); $pdf->page->addContent($code);).
|
||
|
|
$renderHtmlBody = static function () use ($pdf, $body, $bodyBlue, $insertFont): void {
|
||
|
|
$insertFont('', 12);
|
||
|
|
$region = $pdf->page->getRegion();
|
||
|
|
$html = '<p style="text-align:justify;color:' . $bodyBlue . ';">' . $body . '</p>';
|
||
|
|
$pdf->addHTMLCell(
|
||
|
|
html: $html,
|
||
|
|
posx: (float) $region['RX'],
|
||
|
|
posy: (float) $region['RY'],
|
||
|
|
width: (float) $region['RW'],
|
||
|
|
);
|
||
|
|
};
|
||
|
|
|
||
|
|
// =============================================================
|
||
|
|
// SCENARIO 1: rectangular and trapezoidal no-write regions around two images.
|
||
|
|
|
||
|
|
$page = $startPage('No-write page regions: addTextCell flowing around rectangular and trapezoidal shapes');
|
||
|
|
$pageHeight = (float) $page['height'];
|
||
|
|
$setupTrapezoids($pageHeight);
|
||
|
|
$renderTextBody();
|
||
|
|
|
||
|
|
$startPage('No-write page regions: addHTMLCell flowing around rectangular and trapezoidal shapes');
|
||
|
|
$setupTrapezoids($pageHeight);
|
||
|
|
$renderHtmlBody();
|
||
|
|
|
||
|
|
// =============================================================
|
||
|
|
// SCENARIO 2: eight adjacent regions approximating a circle (text wraps its left side).
|
||
|
|
|
||
|
|
$startPage('No-write page regions: addTextCell flowing around a circular shape (8 adjacent segments)');
|
||
|
|
$setupCircle();
|
||
|
|
$renderTextBody();
|
||
|
|
|
||
|
|
$startPage('No-write page regions: addHTMLCell flowing around a circular shape (8 adjacent segments)');
|
||
|
|
$setupCircle();
|
||
|
|
$renderHtmlBody();
|
||
|
|
|
||
|
|
// =============================================================
|
||
|
|
|
||
|
|
$rawpdf = $pdf->getOutPDFString();
|
||
|
|
|
||
|
|
$pdf->renderPDF(rawpdf: $rawpdf);
|