<?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_Measure

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

 */

/**

 * Implement needed classes

 */

require_once 'Zend/Measure/Abstract.php';

require_once 'Zend/Locale.php';

/**

 * Class for handling temperature conversions

 *

 * @category   Zend

 * @package    Zend_Measure

 * @subpackage Zend_Measure_Lightness

 * @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_Measure_Lightness extends Zend_Measure_Abstract

{

    const STANDARD = 'CANDELA_PER_SQUARE_METER';

    const APOSTILB                          = 'APOSTILB';

    const BLONDEL                           = 'BLONDEL';

    const CANDELA_PER_SQUARE_CENTIMETER     = 'CANDELA_PER_SQUARE_CENTIMETER';

    const CANDELA_PER_SQUARE_FOOT           = 'CANDELA_PER_SQUARE_FOOT';

    const CANDELA_PER_SQUARE_INCH           = 'CANDELA_PER_SQUARE_INCH';

    const CANDELA_PER_SQUARE_METER          = 'CANDELA_PER_SQUARE_METER';

    const FOOTLAMBERT                       = 'FOOTLAMBERT';

    const KILOCANDELA_PER_SQUARE_CENTIMETER = 'KILOCANDELA_PER_SQUARE_CENTIMETER';

    const KILOCANDELA_PER_SQUARE_FOOT       = 'KILOCANDELA_PER_SQUARE_FOOT';

    const KILOCANDELA_PER_SQUARE_INCH       = 'KILOCANDELA_PER_SQUARE_INCH';

    const KILOCANDELA_PER_SQUARE_METER      = 'KILOCANDELA_PER_SQUARE_METER';

    const LAMBERT                           = 'LAMBERT';

    const MILLILAMBERT                      = 'MILLILAMBERT';

    const NIT                               = 'NIT';

    const STILB                             = 'STILB';

    /**

     * Calculations for all lightness units

     *

     * @var array

     */

    protected $_units = array(

        'APOSTILB'                      => array('0.31830989',   'asb'),

        'BLONDEL'                       => array('0.31830989',   'blondel'),

        'CANDELA_PER_SQUARE_CENTIMETER' => array('10000',        'cd/cm²'),

        'CANDELA_PER_SQUARE_FOOT'       => array('10.76391',     'cd/ft²'),

        'CANDELA_PER_SQUARE_INCH'       => array('1550.00304',   'cd/in²'),

        'CANDELA_PER_SQUARE_METER'      => array('1',            'cd/m²'),

        'FOOTLAMBERT'                   => array('3.4262591',    'ftL'),

        'KILOCANDELA_PER_SQUARE_CENTIMETER' => array('10000000', 'kcd/cm²'),

        'KILOCANDELA_PER_SQUARE_FOOT'   => array('10763.91',     'kcd/ft²'),

        'KILOCANDELA_PER_SQUARE_INCH'   => array('1550003.04',   'kcd/in²'),

        'KILOCANDELA_PER_SQUARE_METER'  => array('1000',         'kcd/m²'),

        'LAMBERT'                       => array('3183.0989',    'L'),

        'MILLILAMBERT'                  => array('3.1830989',    'mL'),

        'NIT'                           => array('1',            'nt'),

        'STILB'                         => array('10000',        'sb'),

        'STANDARD'                      => 'CANDELA_PER_SQUARE_METER'

    );

}