1 <?php

     2 /**

     3  * Zend Framework

     4  *

     5  * LICENSE

     6  *

     7  * This source file is subject to the new BSD license that is bundled

     8  * with this package in the file LICENSE.txt.

     9  * It is also available through the world-wide-web at this URL:

    10  * http://framework.zend.com/license/new-bsd

    11  * If you did not receive a copy of the license and are unable to

    12  * obtain it through the world-wide-web, please send an email

    13  * to license@zend.com so we can send you a copy immediately.

    14  *

    15  * @category   Zend

    16  * @package    Zend_Pdf

    17  * @copyright  Copyright (c) 2005-2010 Zend Technologies USA Inc. (http://www.zend.com)

    18  * @license    http://framework.zend.com/license/new-bsd     New BSD License

    19  * @version    $Id: GrayScale.php 20096 2010-01-06 02:05:09Z bkarwin $

    20  */

    21 

    22 

    23 /** Internally used classes */

    24 require_once 'Zend/Pdf/Element/Numeric.php';

    25 

    26 

    27 /** Zend_Pdf_Color */

    28 require_once 'Zend/Pdf/Color.php';

    29 

    30 /**

    31  * GrayScale color implementation

    32  *

    33  * @category   Zend

    34  * @package    Zend_Pdf

    35  * @copyright  Copyright (c) 2005-2010 Zend Technologies USA Inc. (http://www.zend.com)

    36  * @license    http://framework.zend.com/license/new-bsd     New BSD License

    37  */

    38 class Zend_Pdf_Color_GrayScale extends Zend_Pdf_Color

    39 {

    40     /**

    41      * GrayLevel.

    42      * 0.0 (black) - 1.0 (white)

    43      *

    44      * @var Zend_Pdf_Element_Numeric

    45      */

    46     private $_grayLevel;

    47 

    48     /**

    49      * Object constructor

    50      *

    51      * @param float $grayLevel

    52      */

    53     public function __construct($grayLevel)

    54     {

    55         if ($grayLevel < 0) { $grayLevel = 0; }

    56         if ($grayLevel > 1) { $grayLevel = 1; }

    57 

    58         $this->_grayLevel = new Zend_Pdf_Element_Numeric($grayLevel);

    59     }

    60 

    61     /**

    62      * Instructions, which can be directly inserted into content stream

    63      * to switch color.

    64      * Color set instructions differ for stroking and nonstroking operations.

    65      *

    66      * @param boolean $stroking

    67      * @return string

    68      */

    69     public function instructions($stroking)

    70     {

    71         return $this->_grayLevel->toString() . ($stroking? " G\n" : " g\n");

    72     }

    73 

    74     /**

    75      * Get color components (color space dependent)

    76      *

    77      * @return array

    78      */

    79     public function getComponents()

    80     {

    81         return array($this->_grayLevel->value);

    82     }

    83 }

    84