129 lines
3.9 KiB
PHP
129 lines
3.9 KiB
PHP
<?php
|
|
/*********************************************************************************
|
|
*
|
|
* TimeTrex is a Workforce Management program developed by
|
|
* TimeTrex Software Inc. Copyright (C) 2003 - 2021 TimeTrex Software Inc.
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify it under
|
|
* the terms of the GNU Affero General Public License version 3 as published by
|
|
* the Free Software Foundation with the addition of the following permission
|
|
* added to Section 15 as permitted in Section 7(a): FOR ANY PART OF THE COVERED
|
|
* WORK IN WHICH THE COPYRIGHT IS OWNED BY TIMETREX, TIMETREX DISCLAIMS THE
|
|
* WARRANTY OF NON INFRINGEMENT OF THIRD PARTY RIGHTS.
|
|
*
|
|
* This program is distributed in the hope that it will be useful, but WITHOUT
|
|
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
|
|
* FOR A PARTICULAR PURPOSE. See the GNU Affero General Public License for more
|
|
* details.
|
|
*
|
|
*
|
|
* You should have received a copy of the GNU Affero General Public License along
|
|
* with this program; if not, see http://www.gnu.org/licenses or write to the Free
|
|
* Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
|
|
* 02110-1301 USA.
|
|
*
|
|
*
|
|
* You can contact TimeTrex headquarters at Unit 22 - 2475 Dobbin Rd. Suite
|
|
* #292 West Kelowna, BC V4T 2E9, Canada or at email address info@timetrex.com.
|
|
*
|
|
*
|
|
* The interactive user interfaces in modified source and object code versions
|
|
* of this program must display Appropriate Legal Notices, as required under
|
|
* Section 5 of the GNU Affero General Public License version 3.
|
|
*
|
|
*
|
|
* In accordance with Section 7(b) of the GNU Affero General Public License
|
|
* version 3, these Appropriate Legal Notices must retain the display of the
|
|
* "Powered by TimeTrex" logo. If the display of the logo is not reasonably
|
|
* feasible for technical reasons, the Appropriate Legal Notices must display
|
|
* the words "Powered by TimeTrex".
|
|
*
|
|
********************************************************************************/
|
|
|
|
|
|
/**
|
|
* @package Core
|
|
*/
|
|
class UnitConvert {
|
|
/*
|
|
This class is used to convert units, ie:
|
|
pounds (lbs) to grams (g)
|
|
inches (in) to meters (m)
|
|
miles (mi) to kiliometers (km)
|
|
*/
|
|
|
|
//Convert weight units to grams, first.
|
|
//Convert dimension units to mm, first.
|
|
//Handle square and cubic (exponent) calculations as well.
|
|
static $units = [
|
|
// 1 Unit = X G
|
|
'oz' => 28.349523125,
|
|
'lb' => 453.59237,
|
|
'lbs' => 453.59237,
|
|
'g' => 1,
|
|
'kg' => 1000,
|
|
|
|
//1 Unit = X MM
|
|
'mm' => 1,
|
|
'in' => 25.4,
|
|
'cm' => 10,
|
|
'ft' => 304.8,
|
|
'm' => 1000,
|
|
'km' => 1000000,
|
|
'mi' => 1609344,
|
|
];
|
|
|
|
//Only units in the same array can be converted to one another.
|
|
static $valid_unit_groups = [
|
|
'g' => [ 'g', 'oz', 'lb', 'lbs', 'kg' ],
|
|
'mm' => [ 'mm', 'in', 'cm', 'ft', 'm', 'km', 'mi' ],
|
|
];
|
|
|
|
/**
|
|
* @param $src_unit
|
|
* @param $dst_unit
|
|
* @param $measurement
|
|
* @param int $exponent
|
|
* @return bool|float|int
|
|
*/
|
|
static function convert( $src_unit, $dst_unit, $measurement, $exponent = 1 ) {
|
|
$src_unit = strtolower( $src_unit );
|
|
$dst_unit = strtolower( $dst_unit );
|
|
|
|
if ( !isset( self::$units[$src_unit] ) ) {
|
|
return false;
|
|
}
|
|
if ( !isset( self::$units[$dst_unit] ) ) {
|
|
return false;
|
|
}
|
|
|
|
if ( $src_unit == $dst_unit ) {
|
|
return $measurement;
|
|
}
|
|
|
|
//Make sure we can convert from one unit to another.
|
|
$valid_conversion = false;
|
|
foreach ( self::$valid_unit_groups as $valid_units ) {
|
|
if ( in_array( $src_unit, $valid_units ) && in_array( $dst_unit, $valid_units ) ) {
|
|
//Valid conversion
|
|
$valid_conversion = true;
|
|
}
|
|
}
|
|
|
|
if ( $valid_conversion == false ) {
|
|
return false;
|
|
}
|
|
|
|
$base_measurement = ( pow( self::$units[$src_unit], $exponent ) * $measurement );
|
|
//Debug::Text(' Base Measurement: '. $base_measurement, __FILE__, __LINE__, __METHOD__, 10);
|
|
if ( $base_measurement != 0 ) {
|
|
$retval = ( ( 1 / pow( self::$units[$dst_unit], $exponent ) ) * $base_measurement );
|
|
|
|
return $retval;
|
|
}
|
|
|
|
return false;
|
|
}
|
|
}
|
|
|
|
?>
|