<?php
/*
 * Rotate Pages:
 * Rotate the pages of an existing PDF document
 *
 * Import a PDF page and place it in the output document with a different
 * orientation using different methods:
 * - option "orientate": the simplest approach
 * - option "rotate": requires translation of the reference point
 * - option "transform": allows arbitrary transformations of the page
 *   including rotations which are not necessarily a multiple of 90 degrees
 *
 * Required software: PDFlib+PDI/PPS 9
 * Required data: PDF document
 */
/* This is where the data files are. Adjust as necessary. */
$searchpath = dirname(__FILE__,3)."/input";

/* By default annotations are also imported. In some cases this
 * requires the Noto fonts for creating annotation appearance streams.
 * We therefore set the searchpath to also point to the font directory.
 */
$fontpath = dirname(__FILE__,3)."/resource/font";
$outfile = "";
$title = "Rotate Pages";

$pdffile = "PDFlib-real-world.pdf";

try {
    $p = new pdflib();

    $p->set_option("searchpath={" . $searchpath . "}");

    $p->set_option("searchpath={" . $fontpath . "}");

    /* This means we must check return values of open_pdi_document() etc. */
    $p->set_option("errorpolicy=return");

    if ($p->begin_document($outfile, "") == 0)
        throw new Exception("Error: " . $p->get_errmsg());

    $p->set_info("Creator", "PDFlib Cookbook");
    $p->set_info("Title", $title);

    
    /* *************************************************
     *  Variant 1: PDI page option "orientate"
     *  This is the simplest method; it can be used for each of
     *  the four directions north/east/south/west without any
     *  additional options or adjustments.
     */

    /* Open input PDF */
    $indoc = $p->open_pdi_document($pdffile, "");
    if ($indoc == 0)
        throw new Exception("Error: " . $p->get_errmsg());

    $page = $p->open_pdi_page($indoc, 1, "");

    if ($page == 0)
        throw new Exception("Error: " . $p->get_errmsg());

    /* Page size with swapped width and height */
    $p->begin_page_ext(50, 50, "");

    /* Orientate the page to the west and use the lower left corner
     * (0, 0) as reference point for placing the page.
     * 
     * The option "adjustpage" changes the dimensions of the output
     * page to those of the placed PDI page.
     */
    $p->fit_pdi_page($page, 0, 0, "orientate=west adjustpage");
    
    $p->close_pdi_page($page);
    $p->close_pdi_document($indoc);
    $p->end_page_ext("");
    

    /* *************************************************
     *  Variant 2: PDI page fitting option "rotate"
     */
    
    /* Open input PDF */
    $indoc = $p->open_pdi_document($pdffile, "");
    if ($indoc == 0)
        throw new Exception("Error: " . $p->get_errmsg());

    $page = $p->open_pdi_page($indoc, 1, "");

    if ($page == 0)
        throw new Exception("Error: " . $p->get_errmsg());

    /* Retrieve page dimension with pCOS and supply output page size as
     * swapped width and height of the input page.
     */
    $pagewidth = $p->pcos_get_number($indoc, "pages[0]/width");
    $pageheight = $p->pcos_get_number($indoc, "pages[0]/height");

    $p->begin_page_ext($pageheight, $pagewidth, "");

    /* Use the "rotate" option; we must move the reference point
     * for placing the page from the lower left corner (0, 0) of the
     * output page to the lower right corner (pageheight, 0).
     */
    $p->fit_pdi_page($page, $pageheight, 0, "rotate=90");

    $p->close_pdi_page($page);
    $p->close_pdi_document($indoc);
    $p->end_page_ext("");
    
    
    /* *************************************************
     * Variant 3: PDI page open option "transform"
     * The most general approach is the "transform" option.
     * It must be applied to $p->open_pdi_page(). Since it sticks to
     * the imported page, the page can be placed at the lower left corner
     * and $p->fit_pdi_page() doesn't require any changes.
     */
    
    /* Open input PDF */
    $indoc = $p->open_pdi_document($pdffile, "");
    if ($indoc == 0)
        throw new Exception("Error: " . $p->get_errmsg());
    
    /* Translate and rotate the page; additional transformations can
     * be added and will be applied in the specified order.
     */
    $page = $p->open_pdi_page($indoc, 1, "transform={translate={" . $pageheight . " 0} rotate=90}");

    if ($page == 0)
        throw new Exception("Error: " . $p->get_errmsg());

    /* Retrieve page dimension with pCOS and supply output page size as
     * swapped width and height of the input page.
     */
    $pagewidth = $p->pcos_get_number($indoc, "pages[0]/width");
    $pageheight = $p->pcos_get_number($indoc, "pages[0]/height");

    $p->begin_page_ext($pageheight, $pagewidth, "");
    
    /* No additional options required for fitting the page */
    $p->fit_pdi_page($page, 0, 0, "");

    $p->close_pdi_page($page);
    $p->close_pdi_document($indoc);
    $p->end_page_ext("");
    
    $p->end_document("");

    $buf = $p->get_buffer();
    $len = strlen($buf);

    header("Content-type: application/pdf");
    header("Content-Length: $len");
    header("Content-Disposition: inline; filename=rotate_pages.pdf");
    print $buf;


}

catch (PDFlibException $e) {
    echo("PDFlib exception occurred:\n" .
        "[" . $e->get_errnum() . "] " . $e->get_apiname() . ": " .
        $e->get_errmsg() . "\n");
    exit(1);
}
catch (Throwable $e) {
    echo($e);
    exit(1);
}

$p = 0;

?>