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| <?php | |
| namespace GeoData; | |
| /** | |
| * Class that represents a bounding box | |
| * Currently, only Earth is supported | |
| */ | |
| class BoundingBox { | |
| /** @var float */ | |
| public $lat1; | |
| /** @var float */ | |
| public $lon1; | |
| /** @var float */ | |
| public $lat2; | |
| /** @var float */ | |
| public $lon2; | |
| /** @var string */ | |
| public $globe; | |
| /** | |
| * @param float $lat1 | |
| * @param float $lon1 | |
| * @param float $lat2 | |
| * @param float $lon2 | |
| * @param string $globe | |
| */ | |
| public function __construct( $lat1, $lon1, $lat2, $lon2, $globe = 'earth' ) { | |
| $this->lat1 = $lat1; | |
| $this->lon1 = $lon1; | |
| $this->lat2 = $lat2; | |
| $this->lon2 = $lon2; | |
| $this->globe = $globe; | |
| } | |
| /** | |
| * Constructs a bounding box from 2 corner coordinates | |
| * | |
| * @param Coord $topLeft | |
| * @param Coord $bottomRight | |
| * @return self | |
| */ | |
| public static function newFromPoints( Coord $topLeft, Coord $bottomRight ): self { | |
| return new self( $topLeft->lat, $topLeft->lon, $bottomRight->lat, $bottomRight->lon, | |
| $topLeft->globe ); | |
| } | |
| /** | |
| * @return Coord Top left corner of this bounding box | |
| */ | |
| public function topLeft(): Coord { | |
| return new Coord( $this->lat1, $this->lon1, $this->globe ); | |
| } | |
| /** | |
| * @return Coord Bottom right corner of this bounding box | |
| */ | |
| public function bottomRight(): Coord { | |
| return new Coord( $this->lat2, $this->lon2, $this->globe ); | |
| } | |
| /** | |
| * Computes a (very approximate) area of this bounding box | |
| * | |
| * @return float | |
| */ | |
| public function area() { | |
| $midLat = ( $this->lat2 + $this->lat1 ) / 2; | |
| $vert = Math::distance( $this->lat1, 0, $this->lat2, 0 ); | |
| $horz = Math::distance( $midLat, $this->lon1, $midLat, $this->lon2 ); | |
| return $horz * $vert; | |
| } | |
| /** | |
| * Returns center of this bounding box | |
| * | |
| * @return Coord | |
| */ | |
| public function center(): Coord { | |
| $lon = ( $this->lon2 + $this->lon1 ) / 2.0; | |
| if ( $this->lon1 > $this->lon2 ) { | |
| // Wrap around | |
| $lon += ( $lon < 0 ) ? 180 : -180; | |
| } | |
| return new Coord( ( $this->lat1 + $this->lat2 ) / 2.0, $lon ); | |
| } | |
| } |