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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; |
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use PHPCoord\CoordinateReferenceSystem\CoordinateReferenceSystem; |
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use PHPCoord\CoordinateReferenceSystem\Geocentric; |
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use PHPCoord\CoordinateSystem\Axis; |
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use PHPCoord\UnitOfMeasure\Length\Length; |
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use PHPCoord\UnitOfMeasure\Length\Metre; |
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use PHPCoord\UnitOfMeasure\UnitOfMeasureFactory; |
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/** |
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* Coordinate representing a point in ECEF geocentric form. |
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* @author Doug Wright |
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*/ |
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class GeocentricPoint extends Point |
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{ |
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/** |
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* X co-ordinate. |
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* @var Length |
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*/ |
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protected $x; |
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/** |
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* Y co-ordinate. |
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* @var Length |
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*/ |
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protected $y; |
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/** |
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* Z co-ordinate. |
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* @var Length |
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*/ |
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protected $z; |
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/** |
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* Coordinate reference system. |
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* @var CoordinateReferenceSystem |
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*/ |
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protected $crs; |
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/** |
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* Constructor. |
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* @param Length $x refer to CRS for preferred unit of measure, but any length unit accepted |
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* @param Length $y refer to CRS for preferred unit of measure, but any length unit accepted |
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* @param Length $z refer to CRS for preferred unit of measure, but any length unit accepted |
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*/ |
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public function __construct(Length $x, Length $y, Length $z, Geocentric $crs) |
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{ |
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$this->crs = $crs; |
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$this->x = UnitOfMeasureFactory::convertLength($x, $this->getAxisByName(Axis::GEOCENTRIC_X)->getUnitOfMeasureId()); |
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$this->y = UnitOfMeasureFactory::convertLength($y, $this->getAxisByName(Axis::GEOCENTRIC_Y)->getUnitOfMeasureId()); |
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$this->z = UnitOfMeasureFactory::convertLength($z, $this->getAxisByName(Axis::GEOCENTRIC_Z)->getUnitOfMeasureId()); |
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} |
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public function getX(): Length |
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{ |
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return $this->x; |
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} |
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public function getY(): Length |
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{ |
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return $this->y; |
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} |
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public function getZ(): Length |
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{ |
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return $this->z; |
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} |
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public function getCRS(): CoordinateReferenceSystem |
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{ |
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return $this->crs; |
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} |
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/** |
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* Calculate surface distance between two points. |
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* Note: this implementation is currently not accurate over long distances, it is the straight line distance, not |
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* the surface distance. |
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*/ |
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public function calculateSurfaceDistance(Point $to): Length |
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{ |
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if ($to->getCRS()->getEpsgCode() !== $this->crs->getEpsgCode()) { |
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throw new \InvalidArgumentException('Can only calculate distances between two points in the same CRS'); |
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} |
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/* @var GeocentricPoint $to */ |
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return new Metre( |
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sqrt( |
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($to->getX()->getValue() - $this->x->getValue()) ** 2 + |
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($to->getY()->getValue() - $this->y->getValue()) ** 2 + |
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($to->getZ()->getValue() - $this->z->getValue()) ** 2 |
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) |
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); |
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} |
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public function __toString(): string |
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{ |
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return "({$this->x}, {$this->y}, {$this->z})"; |
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} |
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} |
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dvdoug /
PHPCoord
