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<?php namespace Arcanedev\GeoLocation\Calculators; |
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use Arcanedev\GeoLocation\Contracts\Calculators\DistanceCalculator as DistanceCalculatorContract; |
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use Arcanedev\GeoLocation\Contracts\Entities\Coordinates\Position; |
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use Arcanedev\GeoLocation\Contracts\Entities\Sphere; |
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use Arcanedev\GeoLocation\Entities\Measures\Distance; |
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use Arcanedev\GeoLocation\Entities\Spheres\Earth; |
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/** |
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* Class DistanceCalculator |
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* |
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* @package Arcanedev\GeoLocation |
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* @author ARCANEDEV <[email protected]> |
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*/ |
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class DistanceCalculator implements DistanceCalculatorContract |
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{ |
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/* ----------------------------------------------------------------- |
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| Properties |
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| ----------------------------------------------------------------- |
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*/ |
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/** @var \Arcanedev\GeoLocation\Contracts\Entities\Sphere */ |
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private $sphere; |
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/* ----------------------------------------------------------------- |
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| Constructor |
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| ----------------------------------------------------------------- |
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*/ |
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/** |
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* DistanceCalculator constructor. |
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* |
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* @param \Arcanedev\GeoLocation\Contracts\Entities\Sphere $sphere |
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*/ |
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public function __construct(Sphere $sphere) |
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{ |
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$this->sphere = $sphere; |
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} |
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/* ----------------------------------------------------------------- |
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| Main Methods |
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| ----------------------------------------------------------------- |
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*/ |
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/** |
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* Create a metric distance calculator, using earth as base sphere. |
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* |
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* @param \Arcanedev\GeoLocation\Contracts\Entities\Sphere|null $sphere |
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* |
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* @return self |
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*/ |
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public static function create($sphere = null) |
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{ |
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return new static($sphere ?: new Earth); |
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} |
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/** |
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* Calculate the distance between two positions. |
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* |
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* @param \Arcanedev\GeoLocation\Contracts\Entities\Coordinates\Position $start |
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* @param \Arcanedev\GeoLocation\Contracts\Entities\Coordinates\Position $end |
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* |
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* @return \Arcanedev\GeoLocation\Entities\Measures\Distance |
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*/ |
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public function calculate(Position $start, Position $end) |
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{ |
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$deltaLatitude = deg2rad( |
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$start->lat()->value() - $end->lat()->value() |
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); |
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$deltaLongitude = deg2rad( |
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$start->lng()->value() - $end->lng()->value() |
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); |
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$angle = asin( |
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sqrt( |
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pow(sin($deltaLatitude * 0.5), 2) |
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+ cos(deg2rad($start->lat()->value())) |
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* cos(deg2rad($end->lat()->value())) |
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* pow(sin($deltaLongitude * 0.5), 2) |
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) |
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) * 2; |
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$value = $angle * $this->sphere->radius(); |
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return new Distance("{$value} meters", $value); |
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} |
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/** |
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* Calculate the numeric distance between two positions. |
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* |
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* @param \Arcanedev\GeoLocation\Contracts\Entities\Coordinates\Position $start |
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* @param \Arcanedev\GeoLocation\Contracts\Entities\Coordinates\Position $end |
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* @param int $precision |
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* |
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* @return float |
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*/ |
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public function distance(Position $start, Position $end, $precision = 2) |
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{ |
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return round($this->calculate($start, $end)->value(), $precision); |
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} |
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} |
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ARCANEDEV /
GeoLocation
