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color/color_gradient

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<?php

/* $Id: color_gradient.php,v 1.7 2013/02/22 14:15:43 rp Exp $

 * Color gradient:

 * Fill some area or text with a smooth transition from one color to another


 * Required software: PDFlib/PDFlib+PDI/PPS 9

 * Required data: none

 */


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

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

$outfile = "";

$title = "Color Gradient";

$fontsize = 36;


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);


    /* Start Page */

    $p->begin_page_ext(595, 842, "");


    /* Fill the page completely with a gradient from green to black:

     * Set the first color for the gradient to green

     */

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


    /* Set the second color for the gradient to black;

     * define an axial gradient with a size similar to the the page size

     */

    $sh = $p->shading("axial"0, 0, 595, 842, 0.0, 0.0, 0.0, 0.0, "");


    /* Draw the gradient */

    $p->shfill($sh);


    /* Fill a rectangle with a gradient:

     * Save the current graphics state

     */

    $p->save();


    /* Set the first color for the gradient to orange */

    $p->setcolor("fill", "rgb", 1.0, 0.5, 0.1, 0.0);


    /* Set the second color for the gradient to a light orange;

     * define an axial gradient with a size similar to the size

     * of the rectangle to be filled

     */

    $sh = $p->shading("axial"200, 200, 450, 450, 0.9, 0.8, 0.8, 0.0, "");


    /* Draw a rectangle and set the clipping path to

     * the shape of the rectangle

     */

    $p->rect(200, 200, 250, 250);

    $p->clip();


    /* Fill the clipping path with the gradient */

    $p->shfill($sh);


    /* Restore the current graphics state to reset the clipping path */

    $p->restore();


    /* Fill a circle with a gradient:

     * Save the current graphics state

     */

    $p->save();


    /* Set the first color for the gradient to white */

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


    /* Set the second color for the gradient to orange;

     * define a radial gradient with a size similar to the size

     * of the circle to be filled

     */

    $sh = $p->shading("radial", 400, 600, 400, 600, 1.0, 0.5, 0.1, 0.0,

        "r0 0 r1 60");


    /* Draw a circle and set the clipping path to

     * the shape of the circle

     */

    $p->circle(400, 600, 50);

    $p->clip();


    /* Fill the clipping path with the gradient */

    $p->shfill($sh);


    /* Restore the current graphics state to reset the clipping path */

    $p->restore();


    /* Fill a text with a gradient:

     * Load the font.

     */

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


    if ($font == 0)

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


    $p->setfont($font, $fontsize);


    /* Set the first color for the gradient to white */

    $p->setcolor("fill", "rgb", 1, 1, 1, 0);


    /* Set the second color for the gradient to orange; define an axial

     * gradient with a size similar to the size of the text to be filled

     */

    $sh = $p->shading("axial", 50, 50, 50, 200, 1.0, 0.5, 0.1, 0.0, "");


    /* Create a shading pattern from the shading and set the

     * pattern as the current fill color

     */

    $pattern = $p->shading_pattern($sh, "");

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


    /* Output the text with the gradient as current fill color */

    $p->fit_textline("Hello World!", 50, 100, "");

    $p->fit_textline("(says PDFlib GmbH)", 50, 100 - $fontsize, "");


    $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=color_gradient.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;

?>