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@lloc lloc/BoundingBox.php
Created May 15, 2019

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<?php
/**
* Class BoundingBox
*/
class BoundingBox {
/**
* @var float $lat
* @var float $lon
* @var int $radius
*/
protected $lat, $lon, $radius;
const EARTH_RADIUS = 6371;
/**
* BoundingBox constructor.
*
* @param float $lat
* @param float $lon
* @param int $radius
*/
public function __construct( float $lat, float $lon, int $radius ) {
$this->lat = $lat;
$this->lon = $lon;
$this->radius = $radius;
}
/**
* @return array
*/
public function getCenter() {
return [ 'lat' => $this->lat, 'lon' => $this->lon ];
}
/**
* @return array
*/
public function getLatitudes() {
$latDeg = rad2deg($this->radius / self::EARTH_RADIUS );
return [
'min' => $this->lat - $latDeg,
'max' => $this->lat + $latDeg,
];
}
/**
* @return array
*/
public function getLongitudes() {
$lonDeg = rad2deg($this->radius / self::EARTH_RADIUS / cos( deg2rad( $this->lat ) ) );
return [
'min' => $this->lon - $lonDeg,
'max' => $this->lon + $lonDeg,
];
}
/**
* Returns true if the value is between the min and max of the coordinates
*
* @param float $value
* @param array $coords
*
* @return bool
*/
protected function filter( float $value, array $coords ) {
return $value >= $coords['min'] && $value <= $coords['max'];
}
/**
* Checks if the $coordinate is in the boundary box
*
* @param float $lat
* @param float $lon
*
* @return bool
*/
public function check( float $lat, float $lon ): bool {
$isLat = $this->filter( $lat, $this->getLatitudes() );
$islon = $this->filter( $lon, $this->getLongitudes() );
return $isLat && $islon;
}
}
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