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color/color_gradient

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<?php

/* $Id: color_gradient.php,v 1.9 2016/12/09 13:37:41 stm 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, "destination={type=fitwindow}") == 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 with option

     * 'startcolor'.

     *

     * The second color for the gradient is set to black using the

     * parameters c1/c2/c3.

     *

     * Note that starting with PDFlib 9.1 the final color of the

     * gradient can also set via the new option 'endcolor'.

     * The call would then look like this:

     *

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

     *     "startcolor={rgb 0.0 0.5 0.5} endcolor={rgb 0 0 0}");

     *     

     * The parameters c1/c2/c3/c4 are ignored in this case.

     */

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

                    "startcolor={rgb 0.0 0.5 0.5}");


    /* Draw the gradient over the whole page */

    $p->shfill($sh);


    /*

     * Fill a rectangle with a gradient:

     *

     * Set the first color for the gradient to orange.

     * 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.

     * Create a shading pattern.

     */

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

                    "startcolor={rgb 1.0 0.5 0.1}");

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


    /*

     * Draw a rectangle using the shading pattern as fill color.

     */

    $p->set_graphics_option("fillcolor={pattern $pattern}");

    $p->rect(200, 200, 250, 250);

    $p->fill();


    /*

     * Fill a circle with a gradient:

     *

     * Set the first color for the gradient to white.

     * 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.

     * Create a shading pattern.

     */

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

        "r0=0 r1=60 startcolor={rgb 1.0 1.0 1.0}");

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

   

    /*

     * Draw a circle using the shading pattern as fill color.

     */

    $p->set_graphics_option("fillcolor={pattern $pattern}");

    $p->circle(400, 600, 50);

    $p->fill();


    /* 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());


    /*

     * Set the first color for the gradient to white.

     * 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.

     * Create a shading pattern.

     */

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

            "startcolor={rgb 1.0 1.0 1.0}");

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

   

    /*

     * Option list to use the shading pattern as the fill color

     * for the text. Also specify font and font size.

     */

    $optlist = "fillcolor={pattern $pattern} font=$font fontsize=$fontsize";

   

    /*

     * Output the text with the shading pattern as current fill color.

     */

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

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

    $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) {

    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;

?>