general/metric_topdown_coordinates

<?php

/* $Id: metric_topdown_coordinates.php,v 1.2 2012/05/03 14:00:39 stm Exp $

 * Metric topdown coordinates:

 * Output text using metric coordinates in a topdown coordinate system

 *

 * Use topdown coordinates starting from the top left instead from the bottom

 * left, scale the coordinate system to use metric coordinates, and place some

 * horizontal lines 1 cm from each other.

 * 

 * Required software: PDFlib Lite/PDFlib/PDFlib+PDI/PPS 7

 * Required data: none

 */

/* This is where the data files are. Adjust as necessary. */

$searchpath = dirname(dirname(dirname(__FILE__)))."/input";

$outfile = "";

$title = "Metric Topdown Coordinates";

try {

    $p = new pdflib();

    $p->set_parameter("SearchPath", $searchpath);

    /* This means we must check return values of load_font() etc. */

    $p->set_parameter("errorpolicy", "return");

    $p->set_parameter("textformat", "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);

   

    $font = $p->load_font("Helvetica", "unicode", "");

    if ($font == 0)

        throw new Exception("Error: " . $p->get_errmsg());

   

    /* Use topdown coordinates */

    $p->set_parameter("topdown", "true");

   

    /* Start an A4 page */

    $p->begin_page_ext(0, 0, "width=a4.width height=a4.height");

   

    /* Scale the coordinate system to use metric coordinates.

     * By default, PDFlib will expect incoming coordinates in DTP points

     * which are defined as: 1 pt = 1/72 inch = 25.4/72 mm = 0.3528 mm.

     * In order to supply the coordinates in centimeters instead of points

     * we have to calculate the scaling factor as follows:

     * (72 points/inch) / (2.54 cm/inch) = 28.3465 points/cm.

     */

    $p->scale(28.3465, 28.3465);

   

    /* Now, PDFlib will interpret all coordinates (except for interactive

     * features, see below) in centimeters. The scaling is only in effect

     * for the current page, and must be repeated on each page (if so

     * desired).

     */

   

    /* Interpret all coordinates for hypertext elements in the coordinates

     * defined above as well

     */

    $p->set_parameter("usercoordinates", "true");

   

    /* Place some horizontal lines 1 cm from each other.

     * With the third line, draw a rectangle.

     */

    $p->setlinewidth(0.01);

 

    for ($i = 1; $i < 29; $i++) {

        $p->moveto(0, $i);

        $p->lineto(1, $i);

        if ($i == 3) {

            $p->rect(0, $i, 1, 1);

        }

            $p->fill_stroke();

    }

   

    /* Set the font size in cm */

    $p->setfont($font, 0.5);

   

    $p->fit_textline("Centimeters from the top left instead of points from " .

        "the bottom left:", 2, 5, "");

    $p->fit_textline("The small lines on the left are placed 1 cm from " .

        "each other.", 2, 6, "");

    $p->fit_textline("This text line is displayed at 7 cm from top and 2 " .

        "cm from the left.", 2, 7, "");

   

    $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=metric_topdown_coordinates.pdf");

    print $buf;

} catch (PDFlibException $e){

    die("PDFlib exception occurred:\n" .

        "[" . $e->get_errnum() . "] " . $e->get_apiname() .

        ": " . $e->get_errmsg() . "\n");

} catch (Exception $e) {

    die($e->getMessage());

}

$p=0;

?>