118 lines
2.3 KiB
PHP
118 lines
2.3 KiB
PHP
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<?php
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namespace Exif;
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/**
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* Returns the latitude and longitude values
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* for exif location data if available
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*
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* @package Kirby Toolkit
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* @author Bastian Allgeier <bastian@getkirby.com>
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* @link http://getkirby.com
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* @copyright Bastian Allgeier
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* @license http://www.opensource.org/licenses/mit-license.php MIT License
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*/
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class Location {
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// latitude
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protected $lat;
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// longitude
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protected $lng;
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/**
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* Constructor
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*
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* @param array $exif The entire exif array
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*/
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public function __construct($exif) {
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if(
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isset($exif['GPSLatitude']) &&
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isset($exif['GPSLatitudeRef']) &&
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isset($exif['GPSLongitude']) &&
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isset($exif['GPSLongitudeRef'])
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) {
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$this->lat = $this->gps($exif['GPSLatitude'], $exif['GPSLatitudeRef']);
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$this->lng = $this->gps($exif['GPSLongitude'], $exif['GPSLongitudeRef']);
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}
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}
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/**
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* Returns the latitude
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*
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* @return float
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*/
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public function lat() {
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return $this->lat;
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}
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/**
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* Returns the longitude
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*
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* @return float
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*/
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public function lng() {
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return $this->lng;
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}
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/**
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* Converts the gps coordinates
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*
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* @param string $coord
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* @param string $hemi
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* @return float
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*/
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protected function gps($coord, $hemi) {
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$degrees = count($coord) > 0 ? $this->num($coord[0]) : 0;
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$minutes = count($coord) > 1 ? $this->num($coord[1]) : 0;
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$seconds = count($coord) > 2 ? $this->num($coord[2]) : 0;
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$hemi = strtoupper($hemi);
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$flip = ($hemi == 'W' || $hemi == 'S') ? -1 : 1;
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return $flip * ($degrees + $minutes / 60 + $seconds / 3600);
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}
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/**
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* Converts coordinates to floats
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*
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* @param string $part
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* @return float
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*/
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protected function num($part) {
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$parts = explode('/', $part);
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if(count($parts) <= 0) return 0;
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if(count($parts) == 1) return $parts[0];
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return floatval($parts[0]) / floatval($parts[1]);
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}
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/**
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* Converts the object into a nicely readable array
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*
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* @return array
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*/
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public function toArray() {
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return array(
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'lat' => $this->lat(),
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'lng' => $this->lng()
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);
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}
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/**
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* Echos the entire location as lat, lng
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*
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* @return string
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*/
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public function __toString() {
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return trim(trim($this->lat() . ', ' . $this->lng(), ','));
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}
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}
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