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<?php |
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/** |
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* PHPCoord. |
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* |
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* @author Doug Wright |
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*/ |
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declare(strict_types=1); |
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namespace PHPCoord\Geometry; |
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use function count; |
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use InvalidArgumentException; |
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use function max; |
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use function min; |
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use PHPCoord\CoordinateOperation\GeographicValue; |
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use PHPCoord\UnitOfMeasure\Angle\Degree; |
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/** |
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* @internal for now |
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*/ |
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class GeographicPolygon |
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{ |
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protected array $vertices; |
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protected bool $crossesAntimeridian; |
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protected function __construct(array $vertices, bool $crossesAntimeridian) |
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{ |
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if (count($vertices) !== 4) { |
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throw new InvalidArgumentException('A bounding box must have exactly 4 vertices (be rectangular)'); |
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} |
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$this->vertices = $vertices; |
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$this->crossesAntimeridian = $crossesAntimeridian; |
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if ($this->crossesAntimeridian) { //convert polygon to be antimeridian based |
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foreach ($this->vertices as &$vertex) { |
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$vertex[0] += 180; |
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if ($vertex[0] > 180) { |
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$vertex[0] -= 360; |
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} |
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} |
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} |
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} |
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/** |
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* @param array<Degree,Degree> $vertices [[long,lat], [long,lat]...] |
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*/ |
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public static function createFromArray(array $vertices, bool $crossesAntimeridian): self |
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{ |
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return new self($vertices, $crossesAntimeridian); |
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} |
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public static function createWorld(): self |
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{ |
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return new self([[-180, -90], [-180, 90], [180, 90], [180, -90]], false); |
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} |
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public function containsPoint(GeographicValue $point): bool |
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{ |
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if ($this->crossesAntimeridian) { |
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$longitude = $point->getLongitude()->add(new Degree(180)); |
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$point = new GeographicValue($point->getLatitude(), $longitude, $point->getHeight(), $point->getDatum()); |
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} |
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[$lon1, $lat1] = $this->vertices[0]; |
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[$lon2, $lat2] = $this->vertices[2]; |
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$west = min($lon1, $lon2); |
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$east = max($lon1, $lon2); |
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$south = min($lat1, $lat2); |
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$north = max($lat1, $lat2); |
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$latitude = $point->getLatitude()->asDegrees()->getValue(); |
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$longitude = $point->getLongitude()->asDegrees()->getValue(); |
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return $latitude <= $north && $latitude >= $south && $longitude >= $west && $longitude <= $east; |
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} |
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public function getCentre(): array |
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{ |
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[$west, $south] = $this->vertices[0]; |
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[$east, $north] = $this->vertices[2]; |
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$latitude = new Degree(($north + $south) / 2); |
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$longitude = new Degree(($west + $east) / 2); |
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if ($this->crossesAntimeridian) { |
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$longitude = $longitude->subtract(new Degree(180)); |
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} |
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return [$latitude, $longitude]; |
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} |
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} |
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dvdoug /
PHPCoord
