<?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) 2005-2007 Zend Technologies USA Inc. (http://www.zend.com)
 * @version    $Id: Lightness.php 3224 2007-02-05 22:08:48Z gavin $
 * @license    http://framework.zend.com/license/new-bsd     New BSD License
 */


/**
 * Implement needed classes
 */
require_once 'Zend/Measure/Exception.php';
require_once 'Zend/Measure/Abstract.php';
require_once 'Zend/Locale.php';


/**
 * @category   Zend
 * @package    Zend_Measure
 * @subpackage Zend_Measure_Lightness
 * @copyright  Copyright (c) 2005-2007 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
{
    // Lightness definitions
    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 MILLIMALBERT                  = 'MILLILAMBERT';
    const NIT                           = 'NIT';
    const STILB                         = 'STILB';

    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'
    );
}