Angle.php

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<?php
#require_once 'Zend/Measure/Abstract.php';
#require_once 'Zend/Locale.php';

class Zend_Measure_Angle extends Zend_Measure_Abstract
{
    const STANDARD = 'RADIAN';

    const RADIAN      = 'RADIAN';
    const MIL         = 'MIL';
    const GRAD        = 'GRAD';
    const DEGREE      = 'DEGREE';
    const MINUTE      = 'MINUTE';
    const SECOND      = 'SECOND';
    const POINT       = 'POINT';
    const CIRCLE_16   = 'CIRCLE_16';
    const CIRCLE_10   = 'CIRCLE_10';
    const CIRCLE_8    = 'CIRCLE_8';
    const CIRCLE_6    = 'CIRCLE_6';
    const CIRCLE_4    = 'CIRCLE_4';
    const CIRCLE_2    = 'CIRCLE_2';
    const FULL_CIRCLE = 'FULL_CIRCLE';

    protected $_units = array(
        'RADIAN'      => array('1','rad'),
        'MIL'         => array(array('' => M_PI,'/' => '3200'),   'mil'),
        'GRAD'        => array(array('' => M_PI,'/' => '200'),    'gr'),
        'DEGREE'      => array(array('' => M_PI,'/' => '180'),    '°'),
        'MINUTE'      => array(array('' => M_PI,'/' => '10800'),  "'"),
        'SECOND'      => array(array('' => M_PI,'/' => '648000'), '"'),
        'POINT'       => array(array('' => M_PI,'/' => '16'),     'pt'),
        'CIRCLE_16'   => array(array('' => M_PI,'/' => '8'),      'per 16 circle'),
        'CIRCLE_10'   => array(array('' => M_PI,'/' => '5'),      'per 10 circle'),
        'CIRCLE_8'    => array(array('' => M_PI,'/' => '4'),      'per 8 circle'),
        'CIRCLE_6'    => array(array('' => M_PI,'/' => '3'),      'per 6 circle'),
        'CIRCLE_4'    => array(array('' => M_PI,'/' => '2'),      'per 4 circle'),
        'CIRCLE_2'    => array(M_PI,                            'per 2 circle'),
        'FULL_CIRCLE' => array(array('' => M_PI,'*' => '2'),      'cir'),
        'STANDARD'    => 'RADIAN'
    );
}