graphics/fill_rules

<?php

/* $Id: fill_rules.php,v 1.2 2012/05/03 14:00:37 stm Exp $

 * Fill Rules:

 * Define some overlapping vector graphics and fill them using

 * various methods

 *

 * Use the default "nonzero winding number" rule to fill overlapping objects and

 * create a ring, for example.

 * Use the "evenodd" fill rule to make overlapping objects being

 * filled alternately.

 *

 * 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 = "Fill Rules";

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 );

    /* For PDFlib Lite: change "unicode" to "winansi" */

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

    if ($font == 0)

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

   

    /* --------------------------------------------------------------------

     * Case I: The default "nonzero winding number" rule will be used. All

     * defined objects will be filled with one $p->fill() call. In this case

     * (without any coordinate transformation being performed), overlapping

     * objects which are drawn counterclockwise will be filled with the

     * current fill color while all objects drawn in clockwise direction

     * won't be filled. Note that $p->circle() and $p->rect() functions define

     * objects which will be drawn counterclockwise.

     * --------------------------------------------------------------------

     */

   

    /* Start Page 1 */

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

    /* Set the color to purple */

    $p->setcolor("fill", "rgb", 1.0, 0.0, 0.5, 0.0);

   

    /* Define a big arc segment of 360 degrees in counterclockwise

     * direction. Move to the starting point of the arc segment first

     */

    $p->moveto(450, 600);

    $p->arc(300, 600, 150, 0, 360);

   

    /* Define a small arc segment of 360 degrees in counterclockwise

     * direction. Move to the starting point of the arc segment first

     */

    $p->moveto(400, 600);

    $p->arc(300, 600, 100, 0, 360);

   

    /* Define a big arc segment of 360 degrees in clockwise direction.

     * Move to the starting point of the arc segment first

     */

    $p->moveto(450, 200);

    $p->arcn(300, 200, 150, 360, 0);

   

    /* Define a small arc segment of 360 degrees in counterclockwise

     * direction. Move to the starting point of the arc segment first

     */

    $p->moveto(400, 200);

    $p->arc(300, 200, 100, 0, 360);

   

    $p->fill_stroke();

   

    /* Set the color to black */

    $p->setcolor("fill", "gray", 0, 0.0, 0, 0.0);

   

    $p->setfont($font, 14);

   

    $p->show_xy("With the default \"nonzero winding number\" rule:", 20, 790);

    $p->show_xy("Stroke a big and a small arc segment counterclockwise " .

        "and fill them with purple", 20, 770);

   

    $p->show_xy("With the default \"nonzero winding number\" rule:", 20, 400);

    $p->show_xy("Stroke a big arc segment clockwise and", 20, 380);

    $p->show_xy("a small arc segment counterclockwise and fill them with " .

        "purple", 20, 360);

   

    $p->end_page_ext("");

   

   

    /* -----------------------------------------------------------------

     * Case II: The fill rule of "evenodd" will be used. All defined

     * objects will be filled with one $p->fill() call. In this case,

     * overlapping objects will be drawn according to the "evenodd" rule

     * and filled alternately.

     * -----------------------------------------------------------------

     */

   

    /* Start Page 2 */

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

   

    $p->set_parameter("fillrule", "evenodd");

   

    /* Set the color to purple */

    $p->setcolor("fill", "rgb", 1.0, 0.0, 0.5, 0.0);

   

    /* Define a rectangle */

    $p->rect(100, 100, 400, 300);

   

    /* Define a big circle */

    $p->circle(300, 500, 200);

 

    /* Define an arc segment */

    $p->moveto(300, 750);

    $p->lineto(300, 500);

    $p->arc(300, 500, 250, 0, 90);

   

    /* Define a small circle */

    $p->circle(300, 600, 50);

   

    $p->fill_stroke();

   

    /* Set the color to black */

    $p->setcolor("fill", "gray", 0, 0.0, 0, 0.0);

   

    $p->setfont($font, 14);

   

    $p->show_xy("With the \"evenodd\" fill rule: Draw a rectangle, a big " .

        "circle,", 20, 810);

    $p->show_xy("an arc segment, and a small circle and fill them with " .

        "purple", 20, 790);

   

    $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=fill_rules.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;

?>