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<?php |
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namespace ZeroConfig\GeoDistance; |
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use Measurements\Exceptions\UnitException; |
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use Measurements\Measurement; |
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use Measurements\Quantities\Angle; |
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use Measurements\Quantities\Length; |
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use Measurements\Units\UnitAngle; |
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use Measurements\Units\UnitLength; |
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use ZeroConfig\GeoDistance\Sphere\SphereInterface; |
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/** |
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* @see https://en.wikipedia.org/wiki/Haversine_formula |
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*/ |
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class DistanceCalculator implements DistanceCalculatorInterface |
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{ |
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/** @var SphereInterface */ |
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private $sphere; |
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/** |
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* Constructor. |
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* |
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* @param SphereInterface $sphere |
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*/ |
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public function __construct(SphereInterface $sphere) |
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{ |
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$this->sphere = $sphere; |
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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 PositionInterface $start |
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* @param PositionInterface $end |
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* |
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* @return Measurement |
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* @throws UnitException UnitException When part of the distance is |
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* incalculable. |
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*/ |
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public function calculate( |
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PositionInterface $start, |
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PositionInterface $end |
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): Measurement { |
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return (new Length( |
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$this->calculateRadianLength($start, $end), |
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UnitLength::meters() |
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))->multiplyBy($this->sphere->getRadius()); |
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} |
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/** |
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* Calculate the radian length between start and end. |
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* |
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* @param PositionInterface $start |
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* @param PositionInterface $end |
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* |
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* @return float |
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* @throws UnitException UnitException When part of the length is |
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* incalculable. |
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*/ |
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private function calculateRadianLength( |
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PositionInterface $start, |
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PositionInterface $end |
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): float { |
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$startLatitude = $this->getRadianValue($start->getLatitude()); |
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$endLatitude = $this->getRadianValue($end->getLatitude()); |
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$deltaLatitude = $this->getRadianValue( |
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$start |
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->getLatitude() |
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->subtract($end->getLatitude()) |
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); |
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$deltaLongitude = $this->getRadianValue( |
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$start |
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->getLongitude() |
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->subtract($end->getLongitude()) |
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); |
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return asin( |
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sqrt( |
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pow( |
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sin($deltaLatitude * 0.5), |
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2 |
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) |
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+ cos($startLatitude) |
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* cos($endLatitude) |
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* pow( |
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sin($deltaLongitude * 0.5), |
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2 |
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) |
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) |
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) * 2; |
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} |
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/** |
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* Get the radion value for the supplied angle. |
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* |
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* @param Measurement $angle |
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* |
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* @return float |
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* @throws UnitException UnitException When part of the angle is |
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* incalculable. |
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*/ |
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private function getRadianValue(Measurement $angle): float |
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{ |
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return $angle->convertTo(UnitAngle::radians())->value(); |
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} |
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} |
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ZeroConfig /
GeoDistance
