freenetis-github/application/helpers/gps.php @ master
| 8baed187 | Michal Kliment | <?php defined('SYSPATH') or die('No direct script access.');
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/*
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* This file is part of open source system FreenetIS
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* and it is released under GPLv3 licence.
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*
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* More info about licence can be found:
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* http://www.gnu.org/licenses/gpl-3.0.html
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*
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* More info about project can be found:
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* http://www.freenetis.org/
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*
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*/
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/**
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* GPS coordinate helper
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*
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* @author Ondřej Fibich
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* @package Helper
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*/
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class gps
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{
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const REGEX = "/^([0-9]+)°([0-9]+)′([0-9]+(\.[0-9]+)?)″$/";
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private static $STR_REPLACE_SUBJECT = array(',', '"', '\'');
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private static $STR_REPLACE_REPLACEMENT = array('.', '″', '′');
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/**
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* Render real coordinates to form:
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* degreesX°minuteX'secondX"N degreesY°minuteY'secondY"E
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*
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* @param double $coordinateX Coordinate X to render
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* @param double $coordinateY Coordinate Y to render
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* @param bool $use_html_entity If it is true °'" are return as HTML entity
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* @return string Rendered coordinates
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*/
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public static function degrees($coordinateX, $coordinateY, $use_html_entity)
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{
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return self::real2degrees($coordinateX, $use_html_entity) . "N, " .
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self::real2degrees($coordinateY, $use_html_entity) . "E";
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}
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/**
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* Render coordinate from MySQL point __toString()
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*
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* @return string $coordinates Rendered coordinates
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* @param bool $use_html_entity If it is true °'" are return as HTML entity
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*/
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public static function degrees_from_str($coordinates, $use_html_entity)
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{
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if (mb_eregi("^[0-9]+\.[0-9]+ [0-9]+\.[0-9]+$", $coordinates))
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{
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$coordinates = explode(' ', $coordinates);
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return gps::degrees($coordinates[0], $coordinates[1], $use_html_entity);
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}
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return "";
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}
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/**
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* Check if degrees coordinate is valid
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*
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* @param string $degrees_coordinate Coordinate in form: degreesX°minuteX'secondX"
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* @return bool
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*/
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public static function is_valid_degrees_coordinate($degrees_coordinate)
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{
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$degrees_coordinate = str_replace(
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self::$STR_REPLACE_SUBJECT,
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self::$STR_REPLACE_REPLACEMENT,
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$degrees_coordinate
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);
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return preg_match(self::REGEX, $degrees_coordinate) == 1;
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}
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/**
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* Render real coordinate to form: degrees°minute'second"
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*
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* @param double $coordinate Coordinate to render
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* @param bool $use_html_entity If it is true °'" are return as HTML entity
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* @return string Rendered coordinate
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*/
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public static function real2degrees($coordinate, $use_html_entity)
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{
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$coordinate = doubleval($coordinate);
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$use_html_entity = ($use_html_entity === true);
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if ($coordinate <= 0)
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{
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return "0";
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}
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$degrees = (int) $coordinate;
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$degrees .= ( $use_html_entity ? "°" : "°");
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// round 12 - because of floating point effect (for example 0.1)
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$minutes = (round(($coordinate - (int) $coordinate), 15) * 60);
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$degrees .= (int) $minutes;
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$degrees .= $use_html_entity ? "′" : "′";
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// round 12 - because of floating point effect (for example 0.1)
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$degrees .= round(round(($minutes - (int) $minutes) * 60, 15), 3);
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$degrees .= $use_html_entity ? "″" : "″";
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return $degrees;
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}
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/**
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* Transform string coordinate in degrees to real
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*
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* @param string $degrees_coordinate Coordinate in form: degreesX°minuteX'secondX"
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* @return double Coordinate
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*/
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public static function degrees2real($degrees_coordinate)
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{
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$degrees_coordinate = str_replace(
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self::$STR_REPLACE_SUBJECT,
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self::$STR_REPLACE_REPLACEMENT,
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$degrees_coordinate
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);
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if (preg_match(self::REGEX, $degrees_coordinate, $regs))
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{
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return intval($regs[1]) + intval($regs[2]) / 60 + doubleval($regs[3]) / 3600;
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}
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return -1.0;
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}
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}
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