<?php

/**

 * Zend Framework

 *

 * LICENSE

 *

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

 * with this package in the file LICENSE.txt.

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

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

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

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

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

 *

 * @category   Zend

 * @package    Zend_Pdf

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

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

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

 */

/** Internally used classes */

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

/** Zend_Pdf_Color */

require_once 'Zend/Pdf/Color.php';

/**

 * GrayScale color implementation

 *

 * @category   Zend

 * @package    Zend_Pdf

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

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

 */

class Zend_Pdf_Color_GrayScale extends Zend_Pdf_Color

{

    /**

     * GrayLevel.

     * 0.0 (black) - 1.0 (white)

     *

     * @var Zend_Pdf_Element_Numeric

     */

    private $_grayLevel;

    /**

     * Object constructor

     *

     * @param float $grayLevel

     */

    public function __construct($grayLevel)

    {

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

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

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

    }

    /**

     * Instructions, which can be directly inserted into content stream

     * to switch color.

     * Color set instructions differ for stroking and nonstroking operations.

     *

     * @param boolean $stroking

     * @return string

     */

    public function instructions($stroking)

    {

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

    }

    /**

     * Get color components (color space dependent)

     *

     * @return array

     */

    public function getComponents()

    {

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

    }

}