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a guest Jul 23rd, 2019 57 Never
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  1. <?php
  2.  
  3. namespace App\Services\Coordinates;
  4.  
  5. class CoordinateService
  6. {
  7.     /**
  8.      * Computes the distance between two coordinates.
  9.      *
  10.      * Implementation based on reverse engineering of
  11.      * <code>google.maps.geometry.spherical.computeDistanceBetween()</code>.
  12.      *
  13.      * @param float $lat1   latitude from the first point
  14.      * @param float $lng1   longitude from the first point
  15.      * @param float $lat2   latitude from the second point
  16.      * @param float $lng2   longitude from the second point
  17.      * @param float $radius (optional) Radius in meters
  18.      *
  19.      * @return float distance in meters
  20.      */
  21.     public function computeDistance($lat1, $lng1, $lat2, $lng2, $radius = 6378137)
  22.     {
  23.         static $x = M_PI / 180;
  24.         $lat1 *= $x;
  25.         $lng1 *= $x;
  26.         $lat2 *= $x;
  27.         $lng2 *= $x;
  28.         $distance = 2 * asin(sqrt(pow(sin(($lat1 - $lat2) / 2), 2) + cos($lat1)
  29.         * cos($lat2) * pow(sin(($lng1 - $lng2) / 2), 2)));
  30.  
  31.         return $distance * $radius;
  32.     }
  33.  
  34.     /*
  35.      * Algorithm based on the spherical law of cosines.
  36.      * https://developers.google.com/maps/solutions/store-locator/clothing-store-locator#creating-the-map
  37.      *
  38.      *To count in miles change 6371 to 3959
  39.      */
  40.     public function pointsInRadiusQuery(array $data)
  41.     {
  42.         return '*,
  43.                (
  44.                    6371 *
  45.                    acos(cos(radians('.$data['latitude'].')) *
  46.                    cos(radians(`latitude`)) *
  47.                    cos(radians(`longitude`) -
  48.                    radians('.$data['longitude'].')) +
  49.                    sin(radians('.$data['latitude'].')) *
  50.                    sin(radians(`latitude` )))
  51.                )
  52.                AS distance';
  53.     }
  54. }
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