SetaPDF-Core Manual

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<?php
require_once('library/SetaPDF/Autoload.php');

$writer = new \SetaPDF_Core_Writer_Http('link-annotation.pdf', true);
$document = new \SetaPDF_Core_Document($writer);

// create a font instance
$font = \SetaPDF_Core_Font_Standard_Helvetica::create($document);

// let's create a page
$pages = $document->getCatalog()->getPages();
$page = $pages->create(\SetaPDF_Core_PageFormats::A4);

// get access to the annotations helper
$annotations = $page->getAnnotations();

// lets' keep track of the text
$canvas = $page->getCanvas();
$canvas->setGraphicStateSync(
    \SetaPDF_Core_Canvas::GS_SYNC_CURRENT_TRANSFORMATION_MATRIX |
    \SetaPDF_Core_Canvas::GS_SYNC_TEXT
);

// write the link text and remember its start and end points
$text = $canvas->text()
    ->begin()
    ->setFont($font, 20)
    ->moveToNextLine(50, 700);
	
$start = $canvas->graphicState()->text()->getBottomUserSpace();
$text->showText('A link to https://www.setasign.com');
$end = $canvas->graphicState()->text()->getTopUserSpace();
$text->end();

// create the link annotation
$link = new \SetaPDF_Core_Document_Page_Annotation_Link(
    array($start->getX(), $start->getY(), $end->getX(), $end->getY()),
    new \SetaPDF_Core_Document_Action_Uri('https://www.setasign.com')
);
// define its color
$link->setColor(array(1, 0, 0));
// define a border and style
$borderStyle = $link->getBorderStyle();
$borderStyle->setWidth(1);
$borderStyle->setStyle(\SetaPDF_Core_Document_Page_Annotation_BorderStyle::SOLID);
// add the new link annotation
$annotations->add($link);

// write another link text and remember its start and end points
$text = $canvas->text()
    ->begin()
    ->setFont($font, 20)
    ->moveToNextLine(50, 650);
	
$start = $canvas->graphicState()->text()->getBottomUserSpace();
$text->showText('This is a JavaScript action!');
$end = $canvas->graphicState()->text()->getTopUserSpace();
$text->end();

// create another link annotation
$link2 = new \SetaPDF_Core_Document_Page_Annotation_Link(
    array($start->getX(), $start->getY(), $end->getX(), $end->getY()),
    new \SetaPDF_Core_Document_Action_JavaScript('app.alert("SetaPDF rockz!");')
);
// define its color
$link2->setColor(array(0, 0, 1));
// define a border and style
$borderStyle = $link2->getBorderStyle();
$borderStyle->setWidth(4);
$borderStyle->setStyle(\SetaPDF_Core_Document_Page_Annotation_BorderStyle::DASHED);
$borderStyle->setDashPattern(array(2, 2));
// add the new link annotation
$annotations->add($link2);

$document->save()->finish();