PDFlib Cookbook

cookbook

blocks/override_block_rectangle

Fill Blocks of an imported PDF page while changing the rectangle coordinates.

Download PHP Code  Switch to Java Code  Show Output  Show Input (stationery_blocks.pdf) 

<?php
/*
 * Override block rectangle:
 * Fill some blocks of an imported PDF page while changing the rectangle 
 * coordinates.
 * 
 * Output an imported PDF page containing blocks. The blocks "name", 
 * "business_address", and "business_city" have a defined font, font size, and
 * color. Fill those blocks by using a different font and a larger font size.
 * In addition, due to the increased font, increase the block rectangle and
 * move its position to prevent it from overlapping with the other blocks.   
 * 
 * Required software: PPS 9
 * Required data: PDF document containing blocks, font
 */

/* This is where the data files are. Adjust as necessary. */
$searchpath = dirname(__FILE__,3)."/input";
$outfile = "";
$title = "Override Block Rectangle";

$infile = "stationery_blocks.pdf";
$blockname = ""; $blocktype = "";

$incrfactor = 3;
$percentage = 30;
 
$nblocks = 3; // number of blocks with properties to be overridden

/* Names of blocks with properties to be overridden */
$blocknames = array(
    "name", "business_address", "business_city" 
);

try {
    $p = new PDFlib();

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

    /* This means we must check return values of load_font() etc. */
    $p->set_option("errorpolicy=return");
    $p->set_option("stringformat=utf8");

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

    $p->set_info("Creator", "PDFlib Cookbook");
    $p->set_info("Title", $title);
    
    /* Open a PDF containing blocks */
    $indoc = $p->open_pdi_document($infile, "");
    if ($indoc == 0)
        throw new Exception("Error: " . $p->get_errmsg());
    
    /* Open the first page */
    $inpage = $p->open_pdi_page($indoc, 1, "");
    if ($inpage == 0)
        throw new Exception("Error: " . $p->get_errmsg());
    
    /* Get the width and height of the imported page */
    $width = $p->pcos_get_number($indoc, "pages[0]/width");
    $height = $p->pcos_get_number($indoc, "pages[0]/height");
    
    /* Start the output page with the size given by the imported page */ 
    $p->begin_page_ext($width, $height, "");

    /* Place the imported page on the output page */
    $p->fit_pdi_page($inpage, 0, 0, "");
    
    /* Retrieve the number of blocks contained on the first page (which is
     * page no. 0) of the PDF opened
     */     
    $blockcount = (int) $p->pcos_get_number($indoc,
        "length:pages[0]/blocks");

    if ($blockcount == 0)
        throw new Exception("Error: " . $infile .
            "does not contain any PDFlib blocks");
    
    /* For three Text blocks on the first page, increase
     * the font size by 20%. Increase the size of the block rectangle by
     * a defined percentage and move the block down to prevent it from
     * overlapping with another block.
     */
    for ($i = 0; $i < $blockcount; $i++)
    {
        /* Get the name of the block */
        $blockname = $p->pcos_get_string($indoc,
            "pages[0]/blocks[" . $i . "]/Name");
        
        /* Get the type of the block */
        $blocktype = $p->pcos_get_string($indoc,
            "pages[0]/blocks[" . $i . "]/Subtype");
        
        for ($j = 0; $j < $nblocks; $j++) {
            if ($blockname == $blocknames[$j]) {
                /* Check if it is a Text block */
                if ($blocktype == "Text")
                {
                /* Get the font size of the block */
                $blockfontsize = $p->pcos_get_number($indoc,
                    "pages[0]/blocks[" . $i . "]/fontsize");
                    
                /* Retrieve the rectangle coordinates of the block */
                $block_llx = (int) $p->pcos_get_number($indoc,
                    "pages[0]/blocks[" . $i . "]/Rect[0]");
                
                $block_lly = (int) $p->pcos_get_number($indoc,
                    "pages[0]/blocks[" . $i . "]/Rect[1]");
                
                $block_urx = (int) $p->pcos_get_number($indoc,
                    "pages[0]/blocks[" . $i . "]/Rect[2]");
                
                $block_ury = (int) $p->pcos_get_number($indoc,
                    "pages[0]/blocks[" . $i . "]/Rect[3]");
                
                /* Increase the font size by the percentage defined */
                $newfontsize = $blockfontsize * ($percentage + 100) / 100;
                
                /* Specify the enlargement by the difference between the old
                 * and the new font size multiplied by an increment factor 
                 */
                $enlarge = $incrfactor * ($newfontsize - $blockfontsize);
                
                /* Increase the block rectangle by the enlargement 
                 * specified. In addition, move the rectangle down by j
                 * times the enlargment to prevent the blocks from 
                 * overlapping.
                 */
                $newblock_llx = $block_llx;
                $newblock_lly = $block_lly - (1 + $j) * $enlarge;
                $newblock_urx = $block_urx + $enlarge;
                $newblock_ury = $block_ury - $j * $enlarge;
                
                $text_optlist = 
                    "fontname=NotoSerif-Regular encoding=unicode fontsize=" . 
                    $newfontsize .
                    " refpoint={" . $block_llx . " " . $newblock_lly . "}" . 
                    " boxsize={" . ($newblock_urx - $newblock_llx) . " " . 
                    ($newblock_ury - $newblock_lly) . "}" .
                    " fillcolor={rgb 0 0.7 0}";
                
                if ($p->fill_textblock($inpage, $blockname, $blockname, 
                    $text_optlist) == 0)
                    trigger_error("Warning: " . $p->get_errmsg() ."\n");
                }
                break;
            }
        }
    }

    $p->end_page_ext("");

    $p->close_pdi_page($inpage);

    $p->end_document("");
    $p->close_pdi_document($indoc);
    $buf = $p->get_buffer();
    $len = strlen($buf);

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

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

$p = 0;

?>