PDFlib Cookbook

cookbook

path_objects/svg_path

Create a path object from a description in SVG path syntax.

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<?php
/*
 * Create a path object from a description in SVG path syntax
 *
 * Required software: PDFlib/PDFlib+PDI/PPS 9
 * Required data: none
 *
 */

$outfile = "";
$exitcode = 0;

$target_x = 200; $target_y = 500;      // target location


try {
    $p = new PDFlib();
    $title = "SVG path";

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

    if ($p->begin_document($outfile, "") == 0) {
        echo("Error: " . $p->get_errmsg(p));
        exit(1);
    }

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

    /* Start an A4 page */
    $p->begin_page_ext(0, 0, "width=a4.width height=a4.height");

    /* Path description in SVG syntax as required by the "d" attribute
     * of the "path" element in SVG
     * (see https://www.w3.org/TR/SVG11/paths.html#PathData)
     */
    $svgPath =
        "M238.458,42.761c0-26.02-17.289-39.467-48.722-39.467 " .
        "c-12.922,0-24.797,0.349-35.625,0.873v117.877h32.481V85.72c2.27,0.175,4.191,0.175,4.889,0.175" .
        "C223.09,85.895,238.458,65.637,238.458,42.761z M204.928,43.809c0,9.779-7.509,15.019-15.892,15.019" .
        "c-0.523,0-1.222,0-2.444-0.175V29.838c1.397-0.174,2.619-0.174,3.143-0.174C200.912,29.664,204.928,36.125,204.928,43.809z";

    /* Create a path object from the SVG path description above */
    $path = $p->add_path_point(0, 0, 0, "addpath", "svgpath = {" . $svgPath . "} close");
    
    /* Retrieve coordinates of the lower left corner of the path's bounding box */
    $mirroropt = "scale={1 -1}";
    
    /* Retrieve the coordinates of the desired corner of the path's
     * bounding box, e.g. (x1, y1) = lower left corner 
     */
    $corner_x = $p->info_path($path, "x1", $mirroropt);
    $corner_y = $p->info_path($path, "y1", $mirroropt);

    /* Mark the target location with a red circle for illustration */
    $p->set_graphics_option("fillcolor=red");
    $p->circle($target_x, $target_y, 5);
    $p->fill();
    
    /* ----------------------------------------------------------------
     * Draw the path at the selected target location and stroke it
     * If the path directly stems from an SVG file it uses top-down
     * coordinates which must be adjusted:
     * - supply "scale={1 -1}" for unmirroring the path
     * - draw the path at (target_x-corner_x, target_y-corner_y)
     *   to place the selected corner of the path's bounding box
     *   at the desired target location
     * - if you use the "topdown" page option draw the path at
     *   (target_x-corner_x, target_y+corner_y) instead
     * ----------------------------------------------------------------
     */            
    $p->draw_path($path, $target_x-$corner_x, $target_y-$corner_y,
        $mirroropt .
        " stroke linewidth=3 fill fillcolor=Turquoise linecap=round");
    
    $p->delete_path($path);
    $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=svg_path.pdf");
    print $buf;

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

$p = 0;
?>